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NNadir

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Gender: Male
Current location: New Jersey
Member since: 2002
Number of posts: 25,706

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Meet the Chemists Working to Improve Our Planet.

In celebration of Earth Day, the American Chemical Society is offering these videos.

I haven't watched any of these videos myself, and therefore can't recommend them, but I plan to do so.

Chemists Working to Improve Our Planet



We have to do something.

March for Science being held this Saturday.

Scientists from around the country will be converging on Washington DC to protest the attacks on science by our "government," and other protofacists around the world.

Local satellite protests will be held.

I plan to attend the NJ March: NJ March for Science

The motto of the marches is "Science, not Silence."

All who deplore attacks on science should try to attend.

It's, um, bullshit of the usual kind. Solar thermal plants on an industrial scale are...

...grotesque failures.

This kind of efficiency hype announced as a "record" will do exactly what the entire failed expensive and useless solar industry always does, generate more complacency than energy.

The solar industry after 50 years of mindless and frankly destructive cheering can't even produce 1% of the world's primary energy.

Now you're going to make hydrogen from it, and you're screaming for joy at 16.2% efficiency?

In order to produce in the form of hydrogen the world's energy supply, which is 570 exajoules per year, the solar thermal industry would need to produce 3518 exajoules as primary energy.

The piece of garbage solar thermal plant trashing the Mohave desert right now, the Ivanpah tragedy covers 3,500 acres and doesn't produce as much energy as a small garbage incinerator.

It produced just 0.0639 exajoules of energy in three years, or 0.0213 exajoules per year.

It's in a desert.

In order to produce 3500 exajoules, we would need about 1.6 million similar plants, all of them in deserts, and all of them paradoxically near water to split. They would need to occupy 23 million km[sup]2[/sup], which is very close to the entire surface area of North America.

How ridiculously stupid!

These reports, which amount to nothing more than big lies, are useless. They present failure as a victory.

Nature Materials Science: How solar PV will be doing in 2030.

The following graphic comes from Nature Materials 15, 117–120 (2016)



The graphic's caption says that so called "renewable energy" could provide 132 exajoules by 2030, when presumably we'll be pushing 420 ppm (or more) of carbon dioxide in the atmosphere.

Current human consumption is about 570 exajoules per year.

The solar industry soaks up (at current rates) over 100 billion dollars per year.

By 2030, we can expect this industry to produce about 4 exajoules.

We're saved.

The Spread of Antibiotic Resistance Genes From Biogas Digestors.

At a relatively late age, I've decided to learn more about a subject in which my knowledge is relatively weak, specifically genomic molecular biology. Toward this end, I picked up a monograph that draws on certain similarities between the study of proteomics - about which I know a reasonable amount - and genomics, specifically with respect to the 3 dimensional geometry, specifically, this one: RNA 3D Structure Analysis and Prediction.

In contemplating my ignorance of genomics, predicated on the ridiculous and ignorant idea that somehow it was "simple" I was struck by the remarks of the structural biologist Michael Levitt of Stanford University who wrote a telling set of remarks than (and considerably more sophisticated remariks I will ever be able to aspire to make) in the introduction to the monograph. To wit:

I first encountered ribonucleic acid in October 1968 (see early history of Computational Structural Biology, Levitt 2001). I worked on RNA for a few years and published three out of my five first papers on RNA (Levitt 1969, 1972, 1973) before abandoning the system as being too simple and not nearly as interesting as protein folding. This was my first of several career-level mistakes. In 1976, I also refused to get involved in the analysis of DNA sequences when Bart Barrell brought me the DNA sequence of jX174 bacteriophage (Smith et al. 1977; Levitt 2001). What I find most surprising about these mistakes is that the decisions seemed very easy when I made them and regrets came much more slowly but lasted longer. In 2008,RNA caught my fancy again thanks to a HFSP International collaboration spearheaded by Michael Kiebler (Medical University of Vienna), and I have now come full circle with four of my five most recent papers involving RNA.


(M. Levitt, pg 1, RNA 3D Structure Analysis and Prediction, Westoff and Leontis, Eds, Springer, 2012)

As Dr. Levitt knows on a highly technical level, and as I now now on a far more primitive level, there is nothing simple about the molecular biology - in his case structural molecular biology, in the broader sense functional molecular biology as derived from structure - of genomics.

With an eye to ameliorating some of my ignorance, I have begun to scan and dig a little deeper into some types of papers that I previously skipped over when perusing my favorite scientific journals, such as the paper I will now discuss, this one:

Antibiotic Resistance Genes and Correlations with Microbial Community and Metal Resistance Genes in Full-Scale Biogas Reactors As Revealed by Metagenomic Analysis (Environ. Sci. Technol., 2017, 51 (7), pp 4069–4080)

I am a critic of so called "renewable energy" in general, particularly the solar and wind industries which I regard as expensive failures that have proved difficult to afford and wasters of (most critically) time in a time of very real crisis. This said there is one form of so called "renewable energy" for which I am working to have some sympathy, specifically the use of biomass. The reason is that no matter how hard I think there seems to be no tool quite as well suited to remove carbon dioxide from the atmosphere - something that it is increasingly clear that future generations may need to do under extremely dire circumstances - as biomass, since it is self replicating in such a way as to be capable of providing huge surface areas, a necessary, if not sufficient, condition of gas exchange for dilute gases like carbon dioxide.

A little known fact about why China was open to receiving Richard Nixon in the late 1960's and early 1970's was because they needed a technology in which (at that time) the United States was a world leader, the industrial technology of nitrogen fixation, since there was a very real risk of famine in China owing to the depletion of its soils in the period leading up to, and during, the Cultural Revolution.

Up until that time, China relied on recycling the key materials associated with the real "green" revolution of the 20th century - that of agricultural production - fixed nitrogen and phosphorous. This involved the long and ancient process of spreading the fields with human and animal waste. However this system can never actually be closed, some of the nitrogen and some of the phosphorous is lost as run off, and thus artificial replenishment is critical where ever a large population needs to be supported: This is true of China, but moreover, the world.

Today, China is a world leader in nitrogen fixation technology - the Haber process - but the Haber process is - and there's no facile solution for this - a huge environmental problem, and in any case, phosphorous must be mined or recovered. Thus China, facing the need to displace coal among other things, has a large infrastructure devoted to the historic practice of spreading human and animal wastes on its fields - after recovering some of the energy from these wastes as biogas produced in large digestors.

We're saved.

After digestion, the phosphorous and much of the nitrogen remains behind and these are spread on the fields. But something else remains: genes, specifically the genes of microorganisms.

The intellectual Lilliputians at Greenpeace are unfamiliar with the contents of any science books, and they like to imagine that gene exchange is something they can seek to ban by appeals to fear and ignorance; similar to the appeals to fear and ignorance they direct against nuclear energy.

Bacteria however, don't give a shit what the morons at Greenpeace think, and they go along happily exchanging genes without reference to people assembling at protests wearing monkey suits to trivialize important events, just as they have done for billions of years.

And some of the genes they exchange are antibiotic resistance genes, which represents a huge threat to human health as most of the spectacular increases in human life spans in the 20th century were connected not only to nutrition, but to the rise of antibiotics. However these two issues, antibiotics and nutrition have some negative feedback loops as the Environmental Science and Technology paper just cited makes clear. The difference between human and animal shit in China in 2017 and that in 1967 is the presence of antibiotics in the former.

Some text from the paper:

Anaerobic digestion (AD) has increasingly been used in the treatment of organic wastes and agricultural residues. AD haste advantages of low energy input and generation of renewable energy in the form of biogas. The digested residues are generally reused as fertilizer. In this way, nutrients in the organic wastes are recycled.1 The utilization of digested residues helps to increase crop production and reduce the use of mineral fertilizers.2 Nevertheless, the content of antibiotic resistance genes (ARGs) in the digested residues might increase the spread of antibiotic resistance,3,4 and therefore, the emergence and spreading of ARGs are currently urgent public health issues globally.5

Spreading of ARGs in the environment is a result of the extensive antibiotic use in humans and animals.6 It has been reported that farm antibiotic use is correlated with the rise and spread of ARGs in human bacterial pathogens.7,8 In addition, metals were shown to select for not only metal resistance genes(MRGs) but also ARGs.9,10 Berg et al. demonstrated that Cu exposure coselected for resistance to clinically important antibiotics (e.g., vancomycin).11 ARGs can be spread among different microbial populations via horizontal gene transfer.26Thereby, bacteria with antibiotic resistance can be formed, which could easily infect humans by contact or consumption of raw vegetables.12 Mobile genetic elements, including plasmids, integrons, and insertion sequences, are crucial for horizontal gene transfer of ARGs in the environment.13,14 ARGs were speculated to be uncorrelated with microbial communities due to high mobility caused by horizontal gene transfer.15,16


Two of the authors are from the PRC, one is from Hong Kong, and one is from that offshore oil and gas drilling hellhole, Denmark, which is a world leader in so called "renewable energy," but is still, nonetheless, an offshore oil and gas drilling hellhole.

The Danes have lots of biodigestors. They're very "renewable conscious" in Denmark and collect biogas even as they drill for what is called "natural" gas in the Baltic Sea.

From the text:

In Denmark, there are more than 40 centralized biogas plants, and they are running with manure and industrial wastes as feedstock.27,28 Moreover, most of the WWTPs have full-scale biogas reactors treating the primary and secondary sludge. It is necessary to understand the presence of ARGs in the digested residues from full-scale biogas reactors to properly define the risks posed by land application. The present study made detailed comparative analysis of ARGs in various full-scale biogas reactors via the HTS-based metagenomic approach to provide a new insight of ARG profiles in biogas reactors. The objectives of the study were: (1) to reveal the diversity and abundance of ARGs; (2) to identify the key environmental variables determining the ARG contents; (3) to investigate the correlation between ARGs and microbial communities; (4) to understand the co-occurrence of ARGs and MRGs in various full-scale biogas reactors.


(WWTP is an abbreviation for "Wastewater Treatment Plants" and HTS, depending on context can mean either "High Throughput Sequencing" or "High Throughput Screening." MRG are "metal resistance genes"

If you're as interested in learning about the technology of genetic analysis as I am, this paper is a fun and interesting read, although I won't claim to understand how everything described in it works.

What's important is the conclusion, the spreading of biodigester residues on crops and fields has a very real risk of spreading antibiotic resistance, particularly because of the facilities with which bacteria exchange genes. (There are nice graphics in the paper that draw this out.)

By the way, my own belief is that there are brute force approaches to capturing and utilizing the carbon contained in biomass that are superior to digestors, which are cute, and all "renewally" and therefore fashionable.

This is high temperature thermal reforming.

But that's another issue.

The paper is interesting, a little bit fun, but also a little bit scary, given all the other huge problems we've dumped on the up and coming and all future generations. We'll just add the destruction of the efficacy of antibiotics to the list, along with climate change, mass extinction of biodiversity, material depletion...on and on and on...

Have a nice Sunday.




Racist Nightmare: Those Iranians Are Making Nanorobots.

While looking into some volatile zirconium compounds I stumbled across an interesting paper that would make the Orange Nightmare's comb over stand on its faux orange ends:

Computational design of a new pedal-like nanorobot based on nitrogen inversion

(Journal of Structural Chemistry. Vol. 57, No. 6, pp. 1079-1084, 2016.)

The authors are from (gasp) Iran: Samadizadeh, M. & Gorgani, S.S Department of Chemistry, Faculty of Basic Science, Central Tehran Branch, Islamic Azad University, Tehran, Iran. 2Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran; sarasoleimani240@yahoo.com.

And the original text was written um, in Russian.

Of course, to disguise what they're really up to them start off with all kinds of innocent sounding stuff:

Most of the achievements and developments, regarding the standard of human life and the ability to improve production power, have originated from the invention of different kinds of machines and their related parts and consequently their technological advancement. In the past, this issue was concentrated mainly on mechanical machines, but at present the most noticeable progress is related to the invention and promotion of computer-controlled electronic machines and parts, i.e. computerized ones [1].Since a robot or a machine is a combination of different designed mechanism, each part is defined to serve a special purpose to improve the overall performance and therefore to transfer the energy with a higher quality. This approach can also be applied to a molecular indicator. To achieve this, some molecular elements must be set in a special manner to serve the set purposes and work as a nanorobot or a nanomachine. The field creating robots or machines whose components are at or close to the scale of nanometer (10−9 meters) is called nanorobotics [2-4] that refers to the nanotechnology engineering discipline of designing and building nanorobots. A nanorobot can be defined as a molecular machine consisting of a group of distinct molecular combinations. Therefore, it can be said that a nanomachine is a set of compound molecules and each can change in specific locations due to external stimulus.

Nanomachines are largely in the research-and-development phase [5], but some primitive molecular machines and nanomotors have been tested. An example is a sensor having a switch approximately 1.5 nanometers across, capable of counting specific molecules in a chemical sample. The first useful applications of nanomachines might be in medical technology [6, 7], which could be used to identify and destroy cancer cells [8, 9]. Another potential application is the detection of toxic chemicals, and the measurement of their concentrations in the environment. Indeed, the fabrication of simple nanorobots can be used to create more complex systems. Although nature provides living structures with a large number of molecular machines with high standard structures and complicated functions, chemists are more interested in developing and progressing simpler sets which are entirely synthetic [10]...


I tell you what, since our so called President is better at making excuses, threats and blame assignment, these Iranians can help America by giving him yet another absurd comment, that Iranian nanorobots are controlling his brain.

Seriously, it's a cool paper, relying on Aziridine molecular motions.

I hate having a mindless racist in the White House. It's already such a vast stain on our history.


High Yield Collection of Uranium From Seawater Using Graphene Oxide Functionalized with Protein.

One of my favorite scientific journals is Industrial & Engineering Chemistry Research where (in a predecessor version) one of the most cited papers of all time (8717 citations as of this writing) was published, this one: A New Two-Constant Equation of State

(A beautiful and industrially extremely important equation it is...)

It's been many years since I missed an issue of this journal, which is always fun since it's very broad and one never knows what's going to turn up there, and reading it one feels like a kid in a candy shop as they say, or a kid in a toy store.

A recent issue contained a special treat at the interface of materials science - a career my youngest son will be pursuing in a very wonderful engineering university - proteomics which has been an important - but not necessarily the major - part of my career, and the chemistry of uranium, which is one of my favorite elements whose properties I study non-professionally, since it represents the last, best hope of the human race to save itself from itself.

The paper was written by Chinese scientists and a link to it is here: Bovine Serum Albumin-Coated Graphene Oxide for Effective Adsorption of Uranium(VI) from Aqueous Solutions

An excerpt from the introductory text from the paper:

Currently, numerous researchers are focusing on the availability and cost of U[SUP]VI[/SUP] to fuel nuclear reactors because conventional land-based uranium sources may become depleted by the end of the century.2−4 Therefore, exploitation of alternative uranium sources, such as the extraction of U[SUP]VI[/SUP] from seawater, is of great importance and will ensure the long-term availability and development of this nuclear fuel. Extraction of U[SUP]VI[/SUP] from seawater embraces organic−inorganic ion exchange, electrodialysis, physical and chemical adsorption, chemical precipitation, and extraction.5−8 Adsorption techniques especially stand out from the aforementioned technologies because of their greater feasibility, efficiency of consumption, simple operation, and facility in removing trace levels of ions.9,10 In these techniques, the design of adsorption materials greatly influences the extraction of U[SUP]VI[/SUP] from seawater. Many efficient2D materials based on graphene oxide (GO) have been utilized for adsorption of the radiation element, such as polyaniline−GO,11 GO−polypyrrole,12 GO−dopamine−cysteine,13 GO−amidoxime hydrogel,14 GO−Ni−Al-layered double hydroxide,15 and GO−dopamine.16


It would appear that the Chinese scientists who authored this paper are unimpressed by the dunderhead impressions of professional anti-nukes like, say, those fellows over at the Union of Concerned "Scientists" who imagine that any risk from nuclear energy is vastly more important than the observed risk of dangerous fossil fuel and dangerous biomass combustion waste. Dangerous fossil fuel and biomass waste kills more people than died in World War II from all causes every seven or eight years, like clockwork, seventy million people every decade, not even counting climate related deaths.

This said, the subordinate clause in the first sentence of this excerpt is only true in the case where humanity continues to observe and embrace a "waste" mentality. Converted to plutonium, the uranium already mined, including but not limited to "depleted uranium" coupled with the thorium currently being dumped by the mining enterprises that support the useless wind and electric car industries is sufficient to supply all of the humanity's energy needs - all currently supplied by the dangerous fossil fuel industry as well as the environmentally dubious forms of so called "renewable energy" - for centuries.

I made this point elsewhere: Current World Energy Demand, Ethical World Energy Demand, Depleted Uranium and the Centuries to Come

However, if we look over millennia under the questionable assumption that humanity won't kill itself by embracing highly questionable fantasies, it may be necessary in the far off future to isolate uranium from seawater or natural water supplies in which it is found owing to geology or because of enterprises like fracking which mobilize NORM (Naturally Occurring Radioactive Materials) including (but not limited to) uranium.

The uranium in seawater is inexhaustible even if humanity were to survive on this planet for as long as the sun exists.

I also made this point elsewhere with some reference to the crustal and mantle uranium flux:

Sustaining the Wind Part 3 – Is Uranium Exhaustible?

One of the pleasures of taking my son on college tours as well as accepted student tours has been the opportunities to meet and hear from a number of academic materials scientists and engineers. Some people regard graphene as an academic curiosity that will prove industrially difficult to manufacture, but in at least one department - not the one my son will choose to attend since he had much better offers elsewhere - that holds patents on what is said to be an industrial graphene production processes.

(I haven't looked into the details, so I can't say if these processes are truly viable industrially.)

In the cited paper, graphene oxide is functionalized by bonding a protein to it - bovine serum albumin, obtained from cow's blood. As a vegetarian, I can tell you that it might not be necessary to kill cows to get this stuff, the industrial preparation of pure (or relatively pure) proteins from cultures of genetically modified - everything from E. Coli to Chinese Hamster Ovary - cells is common practice, and is important in the preparation of many modern drugs. Thus, were one to desire to industrialize this chemistry - it won't happen - it is at least feasible, not desirable but feasible to produce this or other similar proteins without requiring cows or other animals or plants.

The process chemistry described in the paper is unattractive from an environmental perspective:

2.2. Synthesis of the Graphene Oxide (GO)−BSA Composites. GO. GO was prepared by a modified Hummer’s method.39 For the reaction, 0.5 g of graphite and 115 mL of H[SUB]2[/SUB]SO4 were stirred in an ice bath for 1 h. Then 30 g of KMnO[sub]4[/sub] was slowly added, and the reaction temperature was maintained at about 0 °C for 3 h. The solution was transferred to a 50 ± 5°C water bath and stirred for 45 min. Then 400 mL of H[SUB]2[/SUB]O was added slowly, followed by stirring for 15 min while the temperature was raised to 50 ± 5 °C. Finally, 300 mL of H[SUB]2[/SUB]Oand 360 g of H[SUB]2[/SUB]O[sub]2[/sub] (5%) were added to the solution with stirring for 15 min. The warm solution was then filtered and washed with H[SUB]2[/SUB]O until the pH was 6−7. The final product was dried for 3 days in a vacuum oven.

GO−BSA. A total of 20 mg of GO, 60 mg of BSA, 35 μL of Py, and EDCI/HOBt/DMAP (molar composition = 1.5:1:0.5)were dissolved in 6 mL of a distilled water/DMF reaction mixture (distilled water/DMF = 4 mL/2 mL) for 5 h at room temperature. Then the solution mixture was washed with amass ratio of ethanol/distilled water = 3/1. Finally, the solution mixture was freeze-dried for 3 days.


In any case there are many metal complexing proteins that are certainly superior to BSA, the transferrins come to mind, and one can imagine designing proteins, or peptides or even other potentially biologically accessible complexing agents (such as porphyrins, the core of both chlorophyll and hemaglobulin) that will do a better job.

But in any case, were we to stop being stupid about "depleted uranium" and decided to use it rather than dump it, the issue would not be relevant for many centuries, during which we might invent far more sustainable chemistry.

Nevertheless, the claimed recovery of uranium from simulated seawater for this process is remarkable, roughly reported as 390 mg per gram. This is orders of magnitude higher than other chemical approaches to doing the same thing, many of which have already been tested on a pilot scale.

Esoteric, probably not practical, but certainly interesting.

Have a nice Friday morning tomorrow.

It would be a mistake to assume that I am interested in winning the "mind" of a person...

...clearly lacking one.

I am unapologetic in regarding anti-nukes as anything but stupid and evil, and, am in fact, completely incapable of regarding them in any other way.

This is a function of the fact that I give a shit about the 70 million deaths every decade from air pollution while they burn oil, gas and coal to carry on about, um, say, Fukushima.

Among the many intellectually and ethically challenged ideas that seems to purvey the despicable anti-nuke mentality is the notion that people should kiss their asses to make them do the right thing.

In reality, one should do the right thing because it, um, is the right thing, and not for any other reason.

Have a nice Friday tomorrow.

Seaweed shortage affects food testing.

I stumbled across this note in the scientific popular press:

Agar supply hit by seaweed shortage

By Joe Whitworth+, 01-Dec-2015

Thermo Fisher Scientific has temporarily stopped selling two agars due to a shortage in the seaweed used to make them.



Seaweed shortage.

I have no idea what kind of events are behind this shortage, but I'm sure it would make an interesting story.

We could recycle the world's most "efficient" solar cells when they fail, um, couldn't we?

They are also the world's most toxic solar cells, but who cares? Solar energy, even if it has failed spectacularly even to slow the degradation of the planetary atmosphere is still, um, "green," right?

The following paper is found in the current issue of ACS Sustainable Chemistry and Engineering:

New Films on Old Substrates: Toward Green and Sustainable Energy Production via Recycling of Functional Components from Degraded Perovskite Solar Cells (ACS Sustainable Chem. Eng., 2017, 5 (4), pp 3261–3269)

Organic/Perovskite Solar Cells are latest among the tens of thousands of "solar breakthroughs" of which you have heard if lived long enough, at least as long as I have lived, which is a long time.

And the introduction to the linked paper tells you, almost breathlessly how "breakthroughy" they are:

Organic−inorganic hybrid lead halide perovskite solar cells(PSCs) have recently taken the photovoltaic (PV) research world by storm, with reported efficiencies exceeding 22% after rapid development for only 6 years.1−6 This mainly originates from the excellent properties of perovskite materials that lead to solar cells that deliver the highest possible efficiencies at the lowest possible cost. Given the recent significant progress in terms of the efficiency,6 stability,7,8 device area,8 etc., it has been predicted that PSCs could be on the market in the near future and the use of perovskite materials could soar soon thereafter.9


I just feel all "renewaly" just reading about it.

After only 6 years...

Only 6 years...

In the last 6 years we've dumped over 180 billion tons of new carbon dioxide into the planetary atmosphere, and in the 6 years before that there were (if you looked) all kinds of "solar breakthroughs" announced.

But with these "reported efficiencies" that have "taken the photovoltaic (PV) research world by storm" well, this time we've got it wired, no?

Well there is a little problem, mentioned in the next paragraph in the same paper:

However, the great promise of PSCs is being challenged because of their Pb content and sensitivity to water, which raises concerns about the potential toxicity of perovskites and their behavior in biological systems or the environment.10−12 In However, the great promise of PSCs is being challenged because of their Pb content and sensitivity to water, which raises concerns about the potential toxicity of perovskites and their behavior in biological systems or the environment.10−12 In pair s orbitals and perovskite symmetry, high ionicity, a large lattice constant, and strong antibonding coupling between Pb lone pair s and I p orbitals.16,17 The actual results after the replacement of lead with other cations are not satisfactory;13−15thus, the lead-containing perovskite is still the material of choice for PSCs. Fortunately,...


Fortunately!

...some teams have been (sic) to investigate the health risks and dangers of lead-based perovskite materials by studying every possible scenario through which perovskite materials could enter the soil and groundwater, reach the food chain, and affect biological systems. For example, Hailegnaw et al. have investigated the possible environmental effects of perovskite solar cells by exposing such devices to water with varying pH and determining the amount of Pb loss and found that the amount of lead that enters the soil is not catastrophic for the environment,10 while Benmessaoud et al. have tested health hazards of perovskite through cytotoxicity studies and underscored the critical importance of conducting further studies to investigate the effects of short- and long-term exposure to CH3NH3PbI3 on health and the environment.11While these results are merely based on simple laboratory experiments, we should do our best to avoid lead outflow.


We should do our best...

In former times, one of the main sources of lead contamination in the environment was the use of tetraethyl lead in dangerous gasoline produced from dangerous crude oil. Now the major source is lead from coal mines aerosolized in coal fired power plants...and no...coal is not dead, not even close, unless of course you like to lie to yourself, as many people do.

We should do our best...

Well the "breakthrough" PSC, perovskite solar cells can be recycled!!!!!

We're saved!!!!

That's the topic of the rest of the paper.

Here's a little process chemistry about the "green" recycling:

Organic−inorganic hybrid lead halide perovskite solar cells(PSCs) have recently taken the photovoltaic (PV) research world by storm, with reported efficiencies exceeding 22% after rapid development for only 6 years.1−6 This mainly originates from the excellent properties of perovskite materials that lead to solar cells that deliver the highest possible efficiencies at the lowest possible cost. Given the recent significant progress in terms of the efficiency,6 stability,7,8 device area,8 etc., it has been predicted that PSCs could be on the market in the near future and the use of perovskite materials could soar soon thereafter.9 from degraded devices. Because of the strong solubility of perovskite and lead iodide (PbI2) in N,N-dimethylformamide(DMF), PSCs can be easily separated and recycled into their major components. By a simple and low-energy process, including DMF washing, chlorobenzene (CB) washing, ultrasonic cleaning, and UV−ozone treatment, the used substrate including TiO2 can still be very clean and can be used to prepare the device again. After two rounds of substrate cycling ,the resulting PH PSC and M PSC still presented peak efficiencies of 11.87% and 11.03%, respectively, indicating th efeasibility of the recycling of used substrates for sustainable, energy- and resource conservation-oriented, and environmentally friendly energy production.


Yuuuuummmm...chlorobenzene...gotta love it.

It's, um, "easy." (The authors - and I do not mean this pejoratively even if it sounds so live in China, where - one has to concede - chlorobenzene might be green.

Sigh. I've lived a long time, too long maybe.

If you believe that every lead halide solar cell that ends up "distributed" for "distributed energy" will end up being recycled, I have an orange "President" who will "Make America Great Again" I'd like to sell you.

What will happen is that solar cells now on sparkling McMansions will end up in the very same place they were installed, transformed into future blighted slums a shadow of their former greatness, with the solar cells still sitting on the decaying roofs, until they collapse, whereupon the lead will leach out into the rain water collecting in the cracked and leaking foundations.

Don't worry, be happy. You'll be dead then, and none of those whomever should live in that ruined world will be able to confront you with the failure of what you believed.

Tomorrow is Friday. Enjoy the coming weekend.
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