摘要
采用隔膜电解法,研究了硝基苯在不锈钢阴极表面的电解过程.结果表明,有溶解氧时,在外加直流电压20V、支持电解质Na2SO4浓度0.025mol·L-1、初始pH=5.3、硝基苯浓度120mg·L-1和电解时间2h条件下,阴极区电解液CODCr去除率约36%.通过对电解过程硝基苯及其产物的挥发和隔膜渗透的研究,表明硝基苯确实是在阴极区被反应降解;通过对溶解氧影响以及硝基苯与OH自由基反应的研究,表明有氧条件下硝基苯的CODCr去除降解主要是由H与O2发生反应生成·HO2和·OH引起,无氧条件下则主要是H直接与硝基苯发生反应.
The electrochemical reaction of Nitrobenzene on the surface of stainless steel cathode was studied, with a heterogencous cation exchange membrane separating the anode and the cathode region. The results showed that on the condition of applied voltage 20 V,nitrobenzene 120 mg· L^-1 ,electrolyte Na2SO4 0. 025 mol·L^-1 and electrolysis time 2 h, the removal rate of CODCr at the cathode region was 36 % in the presence of oxygen. The study of the volatilization and infiltration of Nitrobenzene to anode region showed that Nitrobenzene was degradated in cathode region. The study of the influence of oxygen and the reaction of OH with nitrobenzene showed that the CODCr removal was due to the reaction of H and oxygen producing HO2 and OH and the subsequent reactions in the presence of oxygen, and the reaction of H arid nitrobenzene was the main reaction in the absence of oxygen.
出处
《复旦学报（自然科学版）》
CAS
CSCD
北大核心
2008年第4期413-418,共6页
Journal of Fudan University：Natural Science
基金
上海市环境保护科学技术发展基金会科研资助项目(沪环科05-22)
关键词
硝基苯
隔膜电解
阴极降解
反应机理
激光闪光光解瞬态吸收
Nitrobenzene
membrane electrolysis cell
dcoxidization on cathode
reaction mechanism
laser flash photolysis transient absorption
