纳米α-Fe_2O_3激活过氧单硫酸氢盐去除水中有机染料研究

Degradation of organic dyesin aqueous solution by nano-scaledα-Fe_2O_3 activated peroxymonosulfate

为解决基于硫酸根自由基(SO-4·)的高级氧化法中传统离子催化剂回收难度大、毒性高、对反应时的pH要求严格等问题,选用纳米α-Fe_2O_3作为新型催化材料,研究了各影响因素对纳米α-Fe_2O_3活化过氧单硫酸氢盐(PMS)降解金橙Ⅱ效果的影响。结果表明,有机染料金橙Ⅱ的去除率与氧化剂投量、催化剂投量呈正相关,其kobs值随催化剂投量增加而呈线性增大,实际水体中金橙Ⅱ的降解效率受到一定程度的抑制;α-Fe_2O_3/PMS系统对金橙Ⅱ的矿化效果较低,大部分被去除的金橙Ⅱ可降解为中间产物;纳米α-Fe_2O_3是1种催化性能优异、具实用性的新型催化材料。

To solve the problem of difficult recovery, high toxicity, serious restraint on reaction pH of traditional catalyst in advanced oxidation processes based on sulfate radical （SO4-）, nano-scaled a-Fe2O3 was chosen as novel catalyticmaterial. The effects of different influence factors on the degradation of acid orange （AO） Ⅱ by activation of hydrogen peroxide with nano a- Fe2O3 were investigated. The results show that the removal rate of organic dyes AO Ⅱ has positive correlation with oxidant and catalyst dosages, and the corresponding kobs value linearly increaseswith catalyst dosage, the degradation efficiency of AO Ⅱis in hihited in actual waters. The mineralization rate of AO Ⅱ in a-Fe2O3/PMS system is relatively low, most of the removed AO is degraded to intermediate products. Nano-scaled a-Fe2O3 is confirmed to be a recyclable calalyst with high catalytic performance and low toxcity.