Among the various introduced technologies for water desalination, capacitive deionization (CDI) is a very promising process. CDI (also called Electrosorption) attracted enormous attention as an energy-saving and environmentally friendly desalination technique, because it can be conducted at ambient conditions and low voltage without secondary waste, and does not require high-pressure pumps, membranes, desalination columns or thermal heaters. Among the various carbonaceous materials which are widely exploited as electrodes, graphene revealed good performance due to its marvelous electrical properties and high surface area. In this study, some new carbonaceous materials and metallic nanoparticles encapsulated in a graphite shell (Cd-doped Co/C NPs) are introduced as novel electrodes for the capacitive deionization process. Compared to graphene, Cd-doped Co/C NPs showed better performance. The introduced NPs have been synthesized using a simple sol-gel technique. Typically, a sol-gel composed of cadmium acetate, cobalt acetate and poly(vinyl alcohol) has been prepared based on the polycondensation property of the acetates. Moreover, other carbon nanomaterials were prepared such hollow and channeled carbon nanofibers. All the introduced materials showed good performance. For instance the specific capacitance of the introduced bimetallic nanoparticles (510 F/g) was higher than graphene (455 F/g) which reveals higher desalination for the introduced NPs.
Journal: TechConnect Briefs
Volume: Technical Proceedings of the 2013 Clean Technology Conference and Trade Show
Published: May 12, 2013
Pages: 143 - 146
Industry sector: Energy & Sustainability
Topics: Water Technologies