钴铜铁三元类水滑石材料催化过硫酸氢钾复合盐降解苯酚

采用共沉淀法制备过渡金属钴、铜、铁组成的钴铜铁三元类水滑石材料(CoCuFe-LDH),用于催化过硫酸氢钾复合盐(PMS)降解水中苯酚,并考察了初始pH、CoCuFe-LDH催化剂投加量、PMS用量对苯酚降解效率的影响。实验结果表明:CoCuFeLDH对PMS的催化活性较高;在pH为中性,催化剂为0.20g/L,PMS为2.5mmol/L,苯酚为50mg/L的条件下处理60min,苯酚的去除率可达96%;当催化剂投加量分别为0.05、0.10、0.15g/L,反应40min时,苯酚的去除率分别为76%、82%和91%。自由基猝灭实验表明,CoCuFe-LDH/PMS催化体系中存在硫酸根自由基和羟基自由基,但硫酸根自由基为主要活性自由基。

Degradation of phenol by peroxymonosulfate activated with cobalt-copper-iron ternary hydrotalcite-like compounds

Cobalt-copper-iron ternary hydrotalcite-like compounds(CoCuFe-LDH)composed of transition metal cobalt,copper and iron were prepared by co-precipitation methodology to catalyze the degradation process of phenol in water with peroxymonosulfate(PMS).The effects of initial pH,catalyst dosage and PMS dosage on phenol degradation efficiency were investigated.The results showed that the catalytic activity of CoCuFe-LDH on PMS was good.When 50 mg/L of phenol solution was treated under the following conditions:neutral pH,catalyst dosage 0.20 g/L and PMS dosage 2.5 mmol/L for 60 min,the degradation rate of phenol could reach 96%.When the CoCuFeLDH dosage was 0.05,0.10,0.15 g/L,the degradation rate of phenol at 40 min was found to be 76%,82%and 91%,respectively.Free radical quenching experiments showed that sulfate radicals and hydroxyl radicals existed in the CoCuFe-LDH/PMS catalytic system,but sulfate radicals were the main active radicals.