By a News Reporter-Staff News Editor at Physics Week -- Researchers detail new data in Chemical Physics. According to news reporting originating in Beijing, People's Republic of China, by VerticalNews journalists, research stated, "Water desalination becomes an increasingly important approach for clean water supply to meet the rapidly growing demand of population boost, industrialization, and urbanization. The main challenge in current desalination technologies lies in the reduction of energy consumption and economic costs."
The news reporters obtained a quote from the research from Peking University, "Here, we propose to use charged nanopores drilled in a graphene sheet as ion exchange membranes to promote the efficiency and capacity of desalination systems. Using molecular dynamics simulations, we investigate the selective ion transport behavior of electric-field-driven KCl electrolyte solution through charge modified graphene nanopores. Our results reveal that the presence of negative charges at the edge of graphene nanopore can remarkably impede the passage of Cl- while enhance the transport of K+, which is an indication of ion selectivity for electrolytes. We further demonstrate that this selectivity is dependent on the pore size and total charge number assigned at the nanopore edge. By adjusting the nanopore diameter and electric charge on the graphene nanopore, a nearly complete rejection of Cl- can be realized. The electrical resistance of nanoporous graphene, which is a key parameter to evaluate the performance of ion exchange membranes, is found two orders of magnitude lower than commercially used membranes."
According to the news reporters, the research concluded: "Our results thus suggest that graphene nanopores are promising candidates to be used in electrodialysis technology for water desalinations with a high permselectivity."
For more information on this research see: Ion selection of charge-modified large nanopores in a graphene sheet. Journal of Chemical Physics, 2013;139(11):286-293. Journal of Chemical Physics can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics - www.aip.org/; Journal of Chemical Physics - jcp.aip.org/)
Our news correspondents report that additional information may be obtained by contacting S.J. Zhao, Peking University, Coll Engn, Beijing 100871, People's Republic of China. Additional authors for this research include J.M. Xue and W. Kang.
Keywords for this news article include: Asia, Beijing, Chemical Physics, People's Republic of China
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC