A graphene-based electrochemical filter for water purification

作者：Liu Yanbiao; Lee Juen Hon Dustin; Xia Qing; Ma Ying; Yu Yang; Yung Lin Yue Lanry; Xie Jianping; Ong Choon Nam; Vecitis Chad D; Zhou Zhi^*

来源：Journal of Materials Chemistry A, 2014, 2(39): 16554-16562.

DOI：10.1039/c4ta04006f

A novel graphene-based electrochemical filter With carbon nanotubes as conductive binders was developed for water purification. Ferrocyanide (Fe(CN)(6)(4-)) was used as a model compound to study electron transfer mechanisms in the electrochemical filter. A 70% : 30% ratio of graphene : carbon nanotube was optimal for electrochemical oxidation of Fe(CN)(6)(4-), and electrooxidation rates increased linearly with increasing concentration of influent Fe(CN)(6)(4-). The results of chronoamperometry and normal pulse voltammetry indicated that mass transfer increased up to 15-fold in the electrochemical filter as compared to a batch electrooxidation system. Finally, the efficiency of graphene-based filters for electrooxidation of organic pollutants was evaluated with three selected organic compounds. The oxidation rates increased with increasing anode potential and reached maximum removal rates of 0.010 mol h(-1) m(-2) (88% removal), 0.064 mol h(-1) m(-2) (93% removal), and 0.014 mot h(-1) m(-2) (87% removal) at an applied anode potential of 0.8 V (vs. Ag/AgCl) for tetracycline, phenol, and oxalate, respectively. Overall, the results exemplified the advantages of contaminant removal using a graphene electrode in a flow-through system and demonstrated the potential of using graphene-based electrochemical filters for water purification.

• 出版日期2014-10-21