以铁/活性炭为催化剂的非均相电-Fenton技术对水中苯酚的去除  

Removal of phenol by heterogeneous electro-Fenton with iron/active carbon catalyst

作　　者：包国峰 蔡旺锋[1] 王燕[1] BAO Guofeng;CAI Wangfeng;WANG Yan(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《环境工程学报》2020年第12期3280-3289,共10页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(41907168)。

摘　　要：以铁/活性炭(Fe/AC)作为催化剂,研究了非均相电-Fenton技术对水中苯酚的去除性能。采用等体积浸渍法制备了Fe/AC,利用BET、ICP-OES和XPS等分析方法对Fe/AC进行了表征。结果表明:3.94%的铁已成功负载在活性炭上;在催化剂用量为0.7 g·L^−1、电流密度为9 mA·cm^−2和电解液初始pH为5的条件下,在反应90 min后,苯酚和总有机碳(TOC)的去除率分别达到了95.94%和64.51%。此外,经过8次连续运行实验后,Fe/AC仍表现出优异的催化性能和低铁渗出率,这说明其具有良好的稳定性和可重复使用性。对使用Fe/AC催化剂的非均相电-Fenton技术去除水中苯酚的过程机理进行了讨论,提出了阴极原位生成H2O2、Fe/AC吸附苯酚并催化H2O2分解为·OH进而氧化苯酚的机理。以上结果表明,使用Fe/AC作为催化剂的非均相电-Fenton技术在实际废水处理领域具有较好的应用前景。The performance of phenol removal by using the heterogeneous electro-Fenton with a Fe/active carbon catalyst was studied.The Fe/AC was prepared through the equal volume impregnation method and was characterized by BET,ICP-OES and XPS.The results demonstrated that the 3.94%Fe had been successfully loaded on the activated carbon.At the catalyst dosage of 0.7 g·L^−1,current density of 9 mA·cm^−2 and initial electrolyte pH 5,the removal efficiencies of phenol and total organic carbon(TOC)were 95.94%and 64.51%,respectively after 90 min reaction.After 8 consecutive cycles of experiments,Fe/AC still showed good catalytic performance and low iron leaching ratio,which indicated that Fe/AC exhibited good stability and reusability.A reasonable mechanism had been proposed to interpret the phenol removal process which included production of H2O2 at the cathode,phenol adsorption,H2O2 catalytic decomposition to·OH by Fe/AC and oxidation of phenol.Thus,the heterogeneous electro-Fenton using Fe/AC catalyst has great application prospect in the field of actual wastewater treatment.

关 键 词：Fe/AC 非均相催化剂 电-FENTON 苯酚 

分 类 号：X703[环境科学与工程—环境工程]