黄铁矿作芬顿催化剂对孔雀石绿脱色的影响

为了解染料废水中有机污染物芬顿技术处理过程中黄铁矿的影响,以染料废水中常见有机污染物孔雀石绿为目标,以黄铁矿为催化剂,进行了芬顿反应过程影响因素试验和反应机理分析。结果表明,浓度为1 g/L、p H=5.2的孔雀石绿溶液中加入-360目的黄铁矿5 g/L和浓度为30%的H2O2溶液5 ml/L,在30℃下恒温振荡反应(120r/min)3 h,孔雀石绿的脱色率达可达98%。反应机理分析表明,H2O2在有氧存在的弱酸性环境下,通过黄铁矿的催化,可生成活性很强的羟基自由基·OH,·OH能够通过氧化打破具有显色作用的孔雀石绿分子的共轭结构,使孔雀石绿变成无色、无毒副作用的的有机分子。

Effects of Pyrite as Fenton Catalyst on the Decolorization of Malachite Green

In order to grasp the effect of pyrite on the Fenton technology treatment process of organic pollutants wastewater，using malachite green that is common organic pollutants in wastewater as the research target，with pyrite as catalyst，the Fenton reaction factors tests were conducted and also its reaction mechanism was analyzed.The results showed that the optimum conditions are concentration of malachite green 1 g/L，pH value 5.2，pyrite particle size -360 mesh with dosage of 5 g/L，H₂O₂ concentration 30% with dosage of 5 mL/L，reaction temperature at 30 ℃ and oscillation reaction(120 r/min) time for 3 h，and the degradation of malachite green reached 98%.The reaction mechanism showed that H₂O₂ was generated to highly activity hydroxyl radical · OH in the presence that oxygen in acidic environment is catalyzed by pyrite and the ·OH can oxidize and break the conjugated molecular structure of malachite green which have the ability of coloration.This action makes the malachite green become organic molecules with colorless，non-toxic side effects.