改性石墨电极对DNP废水的降解过程研究

使用自制改性石墨/PTFE气体扩散电极作为阴极,铁电极作为阳极,构成电-Fenton反应体系对2,4-二硝基苯酚废水进行处理。一定电解条件下,研究了D(N/P)、D(N/P/Cu)自制气体扩散阴极电极对2,4-二硝基苯酚废水的处理效果及处理过程废水中金属离子、电导率的变化情况。结果表明,电解60 min时D(N/P/Cu)电极对DNP的去除率达到80.9%,最大去除率比D(N/P)高22.43%。阴极电极中铜离子的掺入不仅提高了电解效率,而且也大大降低了铁阳极的消耗及铁泥的产生量。对D(N/P/Cu)电极电解后的沉淀底物进行了红外光谱分析,发现沉淀物中除了未被降解的DNP外还含有分解产生的小分子烷烃类、胺类等中间产物。通过SEM对改性石墨电极表面进行了观察,发现电极材料粘合牢固紧凑,表面分布许多微小气孔,其中在改性石墨中掺入铜离子的D(N/P/Cu)电极表面更加致密光滑。

Degradation Process of 2,4-Dinitrophenol in Wastewater Using Modified Graphite Electrode

An electrolytic experimental device with self-made graphite/PTFE gas diffusion electrodes as a cathode,as well as iron as an anode,was set up,thus an electro-Fenton reaction system to degrade 2,4-dinitrophenol(DNP)was constituted.The experimental study focused on upgrade of DNP removing rate by using graphite/PTFE cathode,which had two types,i.e.D(N/P/Cu),D(N/P).It was found that D(N/P/Cu),mixed with copper,not only increased electrolytic efficiency but greatly cut down consumption of iron anode,thus reducing iron-sludge production during the electrolysis.In addition,FTIR was used to analyze the decomposed DNP and residual DNP in the sediment,and observations were taken using SEM to study the surface of the modified graphite electrode.