膨胀石墨电极用于电化学氧化降解甲基橙模拟废水

摘要

采用具有优良导电能力的膨胀石墨(EG)作为阳极材料,通过电化学氧化降解甲基橙模拟废水.当废水pH值为2.0,电流密度为13mA·cm-2,电解质浓度为0.1 mol· dm-3,电解时间为20 min时,甲基橙模拟废水的脱色率达到98.6％,COD去除率为58.5％.该降解过程基于化学吸附和电化学氧化,亦即,甲基橙分子首先通过EG表面的-OH键吸附在EG表面,然后通过电化学氧化降解.结果表明:EG是一种处理染料废水的优良材料.%Exfoliated graphite (EG),with good electronic conductivity,was used as an anode material for the electrochemical degradation of methyl orange ( MO),an artificial textile wastewater.Through the electrochemical degradation,98.6％ color removal and 58.5％ chemical oxygen demand reduction was achieved at a pH of 2.0,a current density of 13 mA.cm-2,an electrolyte (NaCl) concentration of 0.1 mol.dm-3 and an electrolysis time of 20 min.The degradation is based on chemical adsorption and electro-oxidation.MO molecules are first adsorbed on the EG surface by hydrogen bonds between the -OH functional groups on EG and the MO molecules,which are then degraded by electrochemical oxidation.EG can therefore be regarded as an excellent material for the treatment of textile wastewater.