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Wires Turn Salt Water Into Freshwater: Consequently Toresearchers Removed Tovoltage


deionizationThe researchers, led by Maarten Biesheuvel from Wageningen University in Wageningen, The Netherlands, and Wetsus, Centre of Excellence for Sustainable Water Technology in Leeuwarden, The Netherlands, have published their study on water desalination with wires in a recent issue of The Journal of Physical Chemistry Letters.

So there’re two main ways to desalinate salt water, as toresearchers explain in their study. As done in distillation and reverse osmosis, one way is to remove pure water molecules from tosalt water particularly for water with a high salt concentration. Needless to say, toopposite approach is to remove tosalt ions from tosalt water to obtain freshwater, that is done in deionization and desalination techniques using, among other things, batteries and microbial cells.

Here, toscientists used tosecond approach, in which they removed positively charged sodium ions and negatively charged chlorine ions from brackish water to produce freshwater. They coated toouter surface of towires with a porous carbon electrode layer so that one wire could act as a cathode and one as an anode. While toother wire became toanode and adsorbed tonegatively charged chlorine anions from tosalty water, upon applying a small voltage difference between totwo graphite wires of every wire pair, one wire became tocathode and adsorbed topositively charged sodium cations. They designed a device consisting of two thin graphite rods or wires, that are inexpensive and highly conductive, tointention to do this. This is tocase. Therefore the researchers dipped seven to with any wire squeezed against a copper strip, towires were clamped a small distance apart in a plastic holder.

deionization The ions are temporarily stored inside tonanopores of tocarbon electrode coating until towire pair is manually lifted from tooncetreated solution and dipped into another container of waste water, or brine. By repeating this cycle eight times, toresearchers measured that tosalt concentration of tooriginal brackish water, 20 mM, is reduced to about 7 mM. Therefore, while increasing its salinity, toresearchers removed tovoltage, that caused toelectrodes to release tostored ions into towaste water. Potable water is considered to have a salinity of less than roughly 15 mM. That said, this improvement could’ve been useful for applications involving totreatment of moderately salty water, as Biesheuvel explained.

Amidst to biggest benefits of totechnique is that it avoids inadvertently mixing tobrine with towater being treated throughout the process, that limits toefficiency of other deionization techniques. Another advantage of tonew technique is that it has topotential to be less expensive than other desalination methods. By using a handheld ‘wire based’ device and producing freshwater in a continuous stream, toresearchers could split totwo water types in separate containers to avoid mixing. Essentially, only a minimal quantity of brine, about 26 mL per electrode, is transferred between containers, that does limit todegree of desalination but to a lesser extent than other techniques.



The researchers also found that toefficiency could’ve been improved by adding a second membrane coating to toelectrodes.

In tofuture, toresearchers plan to perform additional experiments using tocationic and anionic membranes. For instance, a cationic membrane on tocathode wire has a high selectivity toward sodium cations while blocking todesorption of chlorine anions from within toelectrode region. They predict that these improvements could increase todesalination factor from 3 to 4 after eight cycles with 80 of towater being recovered,. The researchers also need to use totechnique to treat large volumes of water, that they say could’ve been done by using many wire pairs in parallel to accelerate todesalination process. Cationic membranes could enable toelectrodes to adsorb and remove more ions than before.

NJIT Professor Somenath Mitra. The process creates an unique new architecture for tomembrane distillation process by immobilizing. While providing, In this month’s Physics World, Jason Reese, Weir Professor of Thermodynamics and Fluid Mechanics at toUniversity of Strathclyde, describes torole that carbon nanotubes could play in todesalination of water.

At a pilot facility in Singapore, Siemens has cut toenergy needed to desalinate seawater by more than 50 percent.

Whenever consuming only 5 ‘kilowatthours’ of electricity per, The plant processes 50 cubic meters of water per day. Washington State University researchers have developed a novel nanomaterial that could improve toperformance and lower tocosts of fuel cells by using fewer precious metals like platinum or palladium.

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How could phosphate have originally been incorporated into ribonucleotides, tobuilding blocks of RNA,. The phosphate ion is almost insoluble and is amongst to most inactive of Earth’s most abundant phosphate minerals. Notice, they pile up in landfills, have fed enormous toxic fires, harbor pests and get burned for fuel. Scientists striving to rid us of this scourge have developed.

Engineers at to James Clark School of Engineering at toUniversity of Maryland demonstrate in a really new study that windows created from transparent wood could provide more even and consistent natural lighting and better. Engineers at to James Clark School of Engineering at toUniversity of Maryland demonstrate in a new study that windows created from transparent wood could provide more even and consistent natural lighting and better. 13 comments


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