Panizza Marco, Cerisola Giacomo
Dipartimento di Ingegneria Chimica e di Processo GB Bonino, Università degli Studi di Genova, Genova, Italy.
J Hazard Mater. 2008 May 1;153(1-2):83-8. doi: 10.1016/j.jhazmat.2007.08.023. Epub 2007 Aug 12.
Electrochemical oxidation of synthetic wastewater containing acid blue 22 on a boron-doped diamond electrode (BDD) was studied, using cyclic voltammetry and bulk electrolysis. The influence of current density, dye concentration, flow rate, and temperature was investigated, in order to find the best conditions for COD and colour removal. It was found that, during oxidation, a polymeric film, causing BDD deactivation, was formed in the potential region of water stability, and that it was removed by anodic polarisation at high potentials in the region of O(2) evolution. Bulk electrolysis results showed that the electrochemical process was suitable for completely removing COD and effectively decolourising wastewaters, due to the production of hydroxyl radicals on the diamond surface. In particular, under optimal experimental conditions of flow rates (i.e. 300 dm(3) h(-1)) and current density (i.e. 20 mA cm(-2)), 97% of COD was removed in 12h electrolysis, with 70 kWh m(-3) energy consumption.
采用循环伏安法和本体电解法，研究了含酸性蓝22的合成废水在掺硼金刚石电极（BDD）上的电化学氧化。研究了电流密度、染料浓度、流速和温度的影响，以寻找去除化学需氧量（COD）和脱色的最佳条件。研究发现，在氧化过程中，在水稳定的电位区域形成了导致BDD失活的聚合物膜，并且该聚合物膜在O(2)析出区域的高电位下通过阳极极化被去除。本体电解结果表明，由于金刚石表面产生羟基自由基，该电化学过程适用于完全去除COD并有效使废水脱色。特别是，在流速（即300 dm(3) h(-1)）和电流密度（即20 mA cm(-2)）的最佳实验条件下，在12小时的电解中去除了97%的COD，能耗为70 kWh m(-3)。
