水溶液中硝基苯的超声微电场降解

THE SONOELECTROCHEMICAL DEGRADATION OF NITROBENZENE IN AQUEOUS SOLUTION

研究了超声微电场中硝基苯的降解过程 ,并探讨了降解机理及反应历程 .结果表明 ,硝基苯的降解符合拟一级反应 ,超声与微电场的耦合协同作用大大提高了硝基苯的降解效率 ,在槽电压 1 0V条件下 ,协同作用的降解速率比简单加和作用的速率高一倍以上 ,经过 30min协同处理后可以获得 93 8%的去除率 ,而溶液中饱和气体种类等对降解也产生一定的影响 .经紫外和SMPE GC MS分析 ,推断硝基苯在电超声场作用下存在氧化还原反应与热解、自由基作用等协同作用 .主要中间降解产物为苯胺、偶氮苯、 1 氧 ,2 苯基 二氮烯、1 ,2 苯二甲酸二丁酯、1 ,2 苯二甲酸丁酯异丁酯等 ,最终产物为CO2 、水及无机盐类 .

The sonoelectrochemical degradation of nitrobenzene in the aqueous solution was studied,and the mechanism and course of degradation was explored.It was found that the degradation followed pseydi-first-order kinetic law,the corporation of sonochemistry and electrochemistry had great effect on the removal rate of nitrobenzene ,for example,in the trough voltrage of 10 volts,the degradation rate of the corporative action in increase by a factor of 2 more than that of the simple addition of sononic and electronic action,and 93.8% of nitrobenzene was removed only after being treated for 30min,types of dissolved gas also had some effects.After aqueous solution was scanned UV-wave-length and identified components with SMPE-GC-MS,results concluded that redox,pyrolysis and radical-oxidation controlled the sonoelectrochemical-degradation of nitrobenzene,and main middle-products included benzenamine,diphenyl-diazene,diphenyl-1-oxide-diazene,12-benzenedicarboxylic acid, bis(2-methylpropyl) ester,12-benzenedicarboxylic acid, butyl 2-methylpropyl ester et al.,final products were carbon dioxide,water and some minerals.