Fenton法处理水中4,4’-二溴联苯及动力学研究

多溴联苯是一类具有持久性有机物特性的难降解物质对环境造成很大危害。应用H2O2/Fe2+对水中的4,4’-二溴联苯(4,4’-DBB)去除效果及影响因素进行研究。结果表明:pH值对4,4’-DBB的去除率的影响很大,反应时间、起始质量浓度以及H2O2/Fe2+的摩尔比对DBB的去除率的影响也较大。当H2O2和Fe2+的摩尔比为10:1,pH=1.4￣2.4时,处理初始浓度为2mg/L 4,4’-DBB的水溶液2h,4,4’-DBB去除率最高可达到99%以上,说明Fenton试剂可将4,4’-DBB基本完全去除。研究还发现4mg/L绝对去除率>2mg/L,说明该方法有利于处理较高浓度的4,4’-DBB,具有一定的工业应用价值。经拟合发现4,4’-DBB的降解符合拟一级反应规律,并推导出动力学方程。

Treatment of 4, 4'-Dibromobiphenyl in Aqueous Solution by Fenton's Reagent and Its Kinetics Study

Polybrominated biphenyl as a kind of hard-degraded material which involves all properties of persistent organic pollutants has made a great harm to environment. The removal efficiency of 4, 4'-Dibromobiphenyl (4, 4'-DBB) and the influence factor by Fenton's reagent were studied. Results showed that pH value was a key factor while reaction time, initial concentration and mol ratio of H2O2/Fe2+ also have obvious effect on 4, 4'-DBB removal, with maximal removal efficiency of 4, 4'-DBB over 99% when mol ratio of H2O2/Fe2+ 10:1, pH 1.4~24, initial concentration of 2mg/L and reaction time 2h, which indicated that 4, 4’-DBB can be almost fully removed by Fenton's reagent. 4, 4’-DBB of 4mg/L was found was more efficient than that of 2mg/L for degradation of high concentration 4, 4'-DBB, which indicated that it has a great value for industrial use. 4, 4'-DBB degradation followed pseudo-first order reaction and the kinetic reaction equation were deducted.