Light-responsive materials with high adsorption capacity and sunlight-triggered regenerability are highly desired for their low-cost and environmentally friendly industrial separation processes. Here we report a poly(spiropyran acrylate) (PSP) functionalized metal–organic framework (MOF) as a sunlight-regenerable ion adsorbent for sustainable water desalination. Under dark conditions, the zwitterionic isomer quickly adsorbs multiple cations and anions from water within 30 minutes, with high ion adsorption loadings of up to 2.88 mmol g−1 of NaCl. With sunlight illumination, the neutral isomer rapidly releases these adsorbed salts within 4 minutes. Single-column desalination experiments demonstrated that PSP–MOF works efficiently for water desalination. A freshwater yield of 139.5 l kg−1 d−1 and a low energy consumption of 0.11 Wh l−1 would be reached for desalinating 2,233 ppm synthetic brackish water. Importantly, this adsorbent shows excellent stability and cycling performance. This work opens up a new direction for designing stimuli-responsive materials for energy-efficient and sustainable desalination and water purification.
In other words...
"Scientists turn seawater into drinkable freshwater using metal compounds, sunlight"
The process, which takes just 30 minutes, was not only able to remove salt ions, but also filter out a range of contaminants.
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The new technology is attractive ... because other desalination processes -- such as thermal desalination and reverse osmosis -- are energy intensive and potentially bad for the environment.
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Researchers suggest the energy-efficient technology could be adapted for mineral extraction and other kinds of mining activities.
[This message has been edited by rinselberg (edited 08-10-2020).]
Wow, this is legitimately amazing. We have... what, 6 of the top 10 largest bodies of freshwater in the world (the United States does), but many other countries do not... so this is HUGE... seriously huge.
Wow, this is legitimately amazing. We have... what, 6 of the top 10 largest bodies of freshwater in the world (the United States does), but many other countries do not... so this is HUGE... seriously huge.
Don't get over excited.
You, me and anyone with the money, ($6,400) can buy a desalinization unit that will fit in the corner of your garage or in the bed of a pickup truck, can purify 200-300 gallons per day and will run off solar panels.
If your screen name is "randye" then GFY, because you shouldn't be online without supervision--a "chaperone", as it were. Not with your stroke-addled brain (or close replica thereof.) Whatever "randye" said about desalination, I don't give a **** , not even going to linger over it long enough to unpack it.
Otherwise--if your screen name is not "randye"--not once have I ever pretended to be a scientist. Not one ****ing instance that anyone with reading comprehension could ever find on this forum. Not here on Pennock's, and not on OptiBoard.
The fact that one other forum member has already reacted to my posting of this article from United Press International as interesting enough for him to respond to is all the proof that anyone needs that this is just one more instance (of 1000s) where "randye" is full of **** . It's tempting to hate on him here at even greater length, but I am not going to bend myself out of shape that way when it's the forum moderator that needs to step up to the plate and take some hacks at getting this right.
I do think that if this new desalination and water purification process is successfully scaled up to large scale installations, it could be something that people will eventually look back upon and say "that was a game changer."
Just as future Internet historians will look back on Pennock's and say that they agree with the Pennock's member (not me) who posted "GFY randye. You're trash."
[This message has been edited by rinselberg (edited 08-11-2020).]
Originally posted by 82-T/A [At Work]: Wow, this is legitimately amazing. We have... what, 6 of the top 10 largest bodies of freshwater in the world (the United States does), but many other countries do not... so this is HUGE... seriously huge.
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Originally posted by randye: Don't get over excited.
You, me and anyone with the money, ($6,400) can buy a desalinization unit that will fit in the corner of your garage or in the bed of a pickup truck, can purify 200-300 gallons per day and will run off solar panels.
Gee, , I am confused. Freshwater does not need desalinization.
quote
Originally posted by williegoat:
Some enterprising satyagrahi could start a Dandi side business.
Don't invest in small potatoes.
Water softeners that use salt Rock salt, solar salt or evaporated salt are the primary salts used in water softeners and are all primarily sodium chloride (NaCl). Water softeners exchange insoluble minerals, including calcium and magnesium, for a more soluble mineral: sodium chloride. Removing these minerals makes the water more effective at dissolving soaps and detergents.
Imagine. Taking salt out of sea water and selling it for freshwater. WIN WIN, ker ching.
Imagine. Taking salt out of sea water and selling it for freshwater. WIN WIN, ker ching.
Mohandas knew mo than those kids in Seattle. The Dandi Satyagraha, an act of non-violent civil disobedience in defiance of British imperialism, took place 90 years ago this last spring.
Originally posted by cliffw: Gee, , I am confused. Freshwater does not need desalinization.
This is from that small writeup at UPI(.com)
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The process, which takes just 30 minutes, was not only able to remove salt ions, but also filter out a range of contaminants.
I'm sure there are other unwanted chemicals beyond (some) salt or sodium chloride in water drawn directly from any of the Great Lakes. (That's what led to this remark from "cliffw.")
This sunlight-energized process, IF it could be scaled up successfully--and reading between the lines, I think it would involve using a similar but not exactly the same Metal Organic Framework, depending on what specific chemical contaminants are known to be in the particular source of water that's being processed this way--I think it could become a "thing." And so also, the first forum member to post a Reply.
It's a brief report--the report that I posted using an Internet link to start this thread.
Everyone should be a desalinization and water purification "enthusiast," but what put me over the top, in terms of my decision to make it a New Topic, was the opportunity to start it with a singularly famous line of verse. "Water, water everywhere..."
It doesn't get much more famous than that, as far as verses or lines of poetry. And that's what made posting it here a No Brainer. Not unlike Barbasol's No Brainers, for those who are familiar with that current or very recent genre of TV ads from one of the most well known brands of shave cream and other shave-related products.
Here's another No Brainer: recognizing the futility of a wheelchair dependent man whose idea of "coping" is to take advantage of an almost completely unmoderated forum to spew endless and endlessly repetitive hatred at other forum members (myself among them) for no good reason.
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Originally posted by randye: OH, and Ronald is still NOT A SCIENTIST but he is seriously mentally ill. Aren't you [Ronald] just the pissy little mental patient today. Maybe a nice tall glass of saltwater along with your meds will help you.
Why is that hatred?
It's like pornography. "You know it when you see it." Especially when you've seen the same stupid crap from "randye" more than a 1000 times.
I wonder if his misuse of this forum could be very directly explained in terms of whatever condition led to his wheelchair dependence. He is someone whose brain has a well functioning Left Side and a badly misfiring or malfunctioning Right Side. That's (my) vernacular for someone who strings together words in a logical and coherent way, but without the slightest respect for the common human values that make societies. And this forum is an online society, albeit a small one.
Could a cerebrovascular accident or "stroke" have caused forum member "randye" to have become wheelchair dependent and--in one fell swoop--created some neurological damage within his brain (the kind of damage that could be seen with an imaging device) that results in this Left Side vs Right Side asymmetry, as I just described it?
Now if you are someone who has actually read this far, and is thinking "Enough already, about 'randye' and his wheelchair," that's exactly my reaction to the (literally) thousands of NOT Keeping It Civilized (Posting Guidelines, anyone?) public messages about myself (and a few other forum members) that have spewed like raw sewage for many a year and continue to spew from the Pennock's user account of forum member "randye."
It's a shame that he isn't GETTING HELP with his own Internet malfeasance, instead of going on endlessly about me.
CLICK FOR FULL SIZE
[This message has been edited by rinselberg (edited 08-11-2020).]
Another No Brainer--recognizing the futility of a wheelchair dependent man whose idea of "coping" is to take advantage of an almost completely unmoderated forum to spew endless and endlessly repetitive hatred at certain other forum members that strike him the wrong way.
About 45 years ago, I worked at a lumber yard and delivered lumber to construction sites. On the rare occasions that we got rained out, we all ended up at the corner tavern called "The Ancient Mariner".
So, when there was water everywhere, we found more than a drop of drink at an aptly dubbed dive.
Originally posted by williegoat: About 45 years ago, I worked at a lumber yard and delivered lumber to construction sites. On the rare occasions that we got rained out, we all ended up at the corner tavern called "The Ancient Mariner".
So, when there was water everywhere, we found more than a drop of drink at an aptly dubbed dive.
Somewhere, a living descendant of Samuel Taylor Coleridge must be smiling at this moment.
Oh, I decided I would look at the homeowner-sized Seawater Desalinization unit that forum member "randye" was talking about (Post #2 or second Reply message.)
It uses Reverse Osmosis, which is one of the more common (or commonly known) methods of producing drinking water from seawater.
If you go back to where this started (Post #0, Original Post, whatever you might call it) what caught my eye was a brief writeup at UPI(.com) about a new report in the science journal Nature Sustainability, "A sunlight-responsive metal–organic framework system for sustainable water desalination."
Here's the Nut Graph (that's actually a "thing" among journalists, and a word coinage that I just picked up) from the writeup at UPI(.com)
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The new [Metal-Organic Framework] technology is attractive, he said, because other desalination processes -- such as thermal desalination and reverse osmosis -- are energy intensive and potentially bad for the environment.
When it comes to promising new ideas about seawater and brackish water desalination (and more--"I'm all about more") who do you want on your side? Pennock's forum member "rinselberg"..? Or a wheelchair-sized sack of emotional (maybe neurological) brain damage that's lingering on the edge of incurable madness, near Tampa Bay?
I guess you could go with the "400 pound guy sitting on a bed somewhere" that was behind the Russia Hoax, but that's another topic altogether.
CLICK FOR FULL SIZE
200 GPD Seawater Desalination System "Watermaker" from ForeverPure... "If you can find a better homeowner-sized desalination system, buy it."
[This message has been edited by rinselberg (edited 08-12-2020).]
Originally posted by 82-T/A [At Work]: Wow, this is legitimately amazing. We have... what, 6 of the top 10 largest bodies of freshwater in the world (the United States does), but many other countries do not... so this is HUGE... seriously huge.
quote
Originally posted by cliffw:Gee, , I am confused. Freshwater does not need desalinization.
Why the confusion? Todd's salient point is that we (in the USA) don't really need much desalination but many countries that have no large lakes do need some way to make fresh water from salt water because they have no fresh water to speak of. Even in the USA, therearemany places where fresh, clean, potable water is at a premium.. San Angelo Texas region is one of them and i used to live there. 3 lakes, but not enough rainfall to keep them even 1/2 full and the ground water was both deep and full of lime. (I lived there for over 10 years) They looked very hard at investing in a big desal plant before they paid the piper and had pipelines built from other counties to bring water into their own lakes. In West Texas, even the catfish have ticks.
Much of the water below ground in the US is brackish. Partially salt laden. There are 800 trillion gallons of brackish water below ground in Texas alone but it is expensive to get it out and get it cleaned up enough to be usable.
Much of the water below ground in the US is brackish. Partially salt laden. There are 800 trillion gallons of brackish water below ground in Texas alone but it is expensive to get it out and get it cleaned up enough to be usable.
Once all those sediments settle out, it'll be good. Just hang on a million or two years. This assumes no one stirs that pot.
Rams
[This message has been edited by blackrams (edited 08-12-2020).]
Once all those sediments settle out, it'll be good. Just hang on a million or two years. This assumes no one stirs that pot.
Rams
That is not how it works..gets worse over time, not better. The water underground is dissolving salts and other minerals into the water from the strata it is held in and passes thru , and that isn't going to 'settle out'.
That is not how it works..gets worse over time, not better. The water underground is dissolving salts and other minerals into the water from the strata it is held in and passes thru , and that isn't going to 'settle out'.
What? Obviously, you don't support wishful thinking...…
Originally posted by cliffw: Gee, , I am confused. Freshwater does not need desalinization.
I mentioned that we have 6 of the top 10 bodies of freshwater to suggest that while it's NOT a problem for us, it clearly is for the rest of the world who have to share the other 4 top 10 bodies of water. Places like Africa , which while they have access to the ocean, do not have access to freshwater... can use this technology. That was my point.
, I am confused. Freshwater does not need desalinization.
