Nanofilters could stall looming water crisis
2011-06-02 0:00

By Nicola Frost | CosmosMagazine.com


Carbon nanotubes may revolutionise the process of converting salt water to fresh water and provide an energy-saving solution to the increasing global demand for fresh drinking water, researchers say.

In a new report, computer modelling was used to study how fluid flows at the molecular level. One of their aims was to find the optimum design for a carbon nanotube (CNT) membrane that can be used in the desalination process.

Thee simulations suggest that this membrane may be 20 to 5,000 times more permeable to water than current commercial scale reverse osmosis membranes, depending on tube density.

“If a new material is found that can maximise water transport through the separating membrane, while at the same time rejecting dissolved ions and other particulates in seawater, reverse osmosis would be a much more efficient process,” said lead author Jason Reese, professor of thermodynamics and fluid mechanics at the University of Strathclyde, Glasgow, Scotland.

Demand for drinking water on the increase

With the global population predicted to reach 9.5 billion by the latter half of this century, the demand for drinking water is only going to increase. Already, more than a billion people are faced with insufficient fresh water resources.

This week, 20 former heads of state, including former U.S. president Bill Clinton and former Japanese prime minister Yasuo Fukuda, warned of an impending "water crisis", and will establish a panel to tackle a worldwide leadership gap on the issue.

Trends in climate change have been shown to predict a redistribution of rainfall globally, with dry regions of the planet only getting dryer.

Huge costs of desalination

Most desalination plants convert salt water to fresh water using reverse osmosis. Pressure is applied to the salt water solution forcing the water through a permeable membrane that separates the pure water from the salts.

There are huge costs associated with desalination plants, however, as they require expensive infrastructure and large amounts of energy. With current technology, it is five times more expensive to desalinate water than to extract groundwater, but CNTs may change this.

Carbon nanotubes are sheets of graphene – one-atom thick carbon – rolled into cylinders. Their versatility lies in the fact that they can be a nanometre in diameter, with a tube length many millions of times longer. They are highly efficient at repelling salt ions. In solution, salts are surrounded by hydrating water molecules, which must be shed in order to pass through the CNTs.

This process takes a lot of energy and as a result doesn’t happen very often. Therefore, the right sized nanotube will optimise water transport while minimising salt ion permeability.


Read the full article at: cosmosmagazine.com



Video from: YouTube.com


Video from: YouTube.com




Related Articles
NASA’s nanotube paint: Blacker than Black (Video)
Researchers create self-assembling nanodevices that move and change shape on demand
Britain: Nanoscale Energy Storage Material Under Development
Peers Criticise Food Industry Secrecy on Nanotechnology
Nuclear-Powered Nanobots Will Allow Us to Forgo Eating a Square Meal for a Century
Nanotubes Weigh A Single Atom
Study Says Carbon Nanotubes as Dangerous as Asbestos [2008]


Latest News from our Front Page

An Occupied Country
2016-02-06 5:42
When people refer to occupation governments or occupied countries, the first thought is often of military occupation—the garrisoning of foreign troops in one’s cities and civil administration by their military executives. The other vision is the trope of a cabal of Haredim sitting in a darkly-lit boardroom with a map of the world on the wall, a dated reading of ...
Immortal Symbols 1941
2016-02-06 2:07
Youtube description: Dutch film "Eeuwig Leevende Tekens" by Hamer - "Volksche Werkgemeenschap" (Folkish Study Group) - ancestral heritage, solar wheel, sun cross, tree of life, etc. Subs by Otharus - http://fryskednis.blogspot.com Source: youtube.com
Ex-German media boss admits on live radio the national news agenda is govt controlled
2016-02-06 1:32
f you really want a lesson in how the Western popular press works, this is it. Without question, Germany is the leading power in Europe. ZDF is its state broadcaster and most popular channel. Together with sister network ARD; German's are obliged to pay €17.98 per month to fund it. This week, during a radio event in Berlin, the retired head of ZDF ...
British teenager is gang raped by 'Moroccan' men after being dragged into a car in Spain
2016-02-06 1:09
A British teenager claims to have been gang-raped in a Spanish resort after being dragged into a car by a group of Moroccan men, it was reported today. The 18-year-old claimed she was attacked while walking home from work late at night in Sabinillas, near Marbella. Police are said to be investigating a group of Moroccan men in the area. A British teenager ...
8 Ways Racially Diverse Schools Hurt White Kids
2016-02-06 1:02
Description from YouTube: I argue against Mother Jones Propaganda Link to the original Mother Jones Article: 3 Ways White Kids Benefit Most From Racially Diverse Schools Links to all the articles and other citations mentioned in my video can be found here: docdro.id/6CpKvgA Source: youtube.com
More News »