钴锌双金属氧化物催化单过硫酸盐降解酸性橙7的效果研究

Cobalt-zinc bimetal oxides catalyze peroxymonosulfate processes for the degradation of acid orange 7

采用溶胶-凝胶法制备钴锌双金属氧化物(Co-ZnO_x),考察Co-ZnO_x催化单过硫酸盐(PMS)降解酸性橙7(AO7)的效果。结果表明,Co-ZnO_x对PMS的催化效果显著。对于500mL摩尔浓度为32μmol/L的AO7溶液,PMS单独作用20min,AO7降解率仅为3.22%,添加100mg/LCo-ZnO_x反应20min后AO7降解率增加至97.49%,AO7的降解过程可用假一级动力学方程描述;溶液pH会影响AO7、Co-ZnO_x的存在状态及活性自由基种类,从而影响AO7降解率,pH为4.04时,体系AO7的降解效果最好,AO7降解过程中起主要作用的活性基团为SO^-_4·。

The cobalt-zinc bimetal oxides( Co-ZnO_x) was prepared using sol-gel method. The obtained Co-ZnO_x was applied to catalyze peroxymonosulfate( PMS) for the degradation of acid orange 7( AO7). Results showed that Co-ZnO_x had perfect catalytic effect on PMS. The degradation rate of 500 m L AO7 solution( 32 μmol/L) oxidized by PMS was only 3.22%after 20 min of reaction,while the degradation rate increased to 97.49% after adding 100 mg/L Co-ZnO_x. The degradation process of AO7 could be described by pseudo-first order kinetics equation. Solution p H could influence the existence state of AO7,Co-ZnO_x and species of active free radical,thus affect the AO7 degradation rate. AO7 achieved the best degradation rate when solution p H was 4.04,and SO^-_4· played the key role in the process of AO7 degradation.