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Electrochemical treatment of anionic surfactants in synthetic wastewater with three-dimensional electrodes
Authors:Kong Wuping  Wang Bo  Ma Hongzhu  Gu Lin
Affiliation:Institute of Energy Chemistry, College of Chemistry and Materials Science, Shaanxi Normal University, Xi'An 710062, China.
Abstract:The electrochemical oxidation of anionic surfactants (sodium dodecyl benzene sulfonate, DBS) contained in simulated wastewater treated by three-dimensional electrode system with combined modified kaolin served as packed bed particle electrodes and Ti/Co/SnO(2)-Sb(2)O(3) anode was studied, the chemical oxygen demand (COD) removal of pollutants in the solutions was also investigated. The results showed that the three-dimensional electrodes in combined process could effectively decompose anionic surfactants. The COD removal efficiency can reach 86%, much higher than that of Ti/Co/SnO(2)-Sb(2)O(3) electrodes used singly or modified kaolin employed singly (graphite as anode and cathode) on the same condition of pH 3 and 38.1 mA/cm(2) current density. The current efficiency and kinetic constant were calculated and energy consumption was studied. At the same time the influence of pH and current density on COD removal efficiency with combined three-dimensional electrodes was also investigated, respectively. The optimal initial pH value of degradation is 3 (acid condition), and a minor COD removal increase follows higher current density.
Keywords:Modified kaolin particles  Three-dimensional electrode  Ti/Co/SnO2–Sb2O3 anode  COD removal
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