摘要
针对Fe^(2+)/H_(2)O_(2)经典芬顿降解污水过程pH适应范围窄的问题,以邻苯二胺(OPD)为目标污染物,研究药剂投加顺序、H_(2)O_(2)投加浓度、Fe^(3+)投加浓度、pH值等反应条件对Fe^(3+)/H_(2)O_(2)类芬顿降解性能的影响和Fe^(3+)/H_(2)O_(2)类芬顿体系的反应机理。研究结果表明:先H_(2)O_(2)后Fe^(3+)药剂投加顺序下的Fe^(3+)/H_(2)O_(2)类芬顿体系具有较强的pH适应性,在pH为7.8~11.3时,OPD污水的降解率为94.4%~94.5%,远高于相同pH范围内Fe^(2+)/H_(2)O_(2)经典芬顿体系65.3%~61.1%的降解率;碱性条件下,Fe^(3+)/H_(2)O_(2)类芬顿体系中存在Fe^(3+)催化H_(2)O_(2)、Fe(OH)_(3)胶体粒子催化H_(2)O_(2)这2种产生自由基的催化反应,发生在Fe(OH)_(3)胶体粒子和H_(2)O_(2)之间的界面非均相反应是Fe^(3+)/H_(2)O_(2)类芬顿体系pH适应性和降解性能增强的主要原因。
Fe^(2+)/H_(2)O_(2) classic Fenton degradation processes have problems of narrow pH adaptation ranges.This study used o-phenylenediamine(OPD)as the model pollutant to investigate effects of reactant addition order,H_(2)O_(2) and Fe^(3+)dosing concentrations and pH values on the degradation performance and reaction mechanism of Fe^(3+)/H_(2)O_(2) Fenton-like systems.The results show that the Fe^(3+)/H_(2)O_(2) Fenton-like system with reactant addition order of H_(2)O_(2) and then Fe^(3+)has strong pH adaptability.At pH=7.8-11.3,the degradation rate of OPD was 94.4%-94.5%,which was much higher than that of the Fe^(2+)/H_(2)O_(2) classic Fenton system(65.3%-61.1%).Under alkaline conditions,Fe^(3+)in the Fe^(3+)/H_(2)O_(2) Fenton-like system catalyzes H_(2)O_(2) to produce HO2×and×OH radicals for OPD degradation under homogeneous reaction and Fe(OH)_(3) colloidal particles catalyzes H_(2)O_(2) to produce HO2×and×OH radicals under heterogeneous reaction.The interface heterogeneous reaction between Fe(OH)_(3) colloidal particles and H_(2)O_(2) is the main reason for the enhancement of pH adaptability and degradability of the Fe^(3+)/H_(2)O_(2) Fenton-like system.
作者
张柯
闫云涛
董勇
ZHANG Ke;YAN Yun-tao;DONG Yong(Shandong University Engineering Training Center,National Engineering Laboratory for Reducing Emissions from Coal Combustion,Engineering Research Center of Environmental Thermal Technology of Ministry of Education,Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization,School of Energy and Power Engineering,Shandong University,Jinan 250061,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2022年第2期249-257,共9页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(U1906232)。
关键词
芬顿
降解
反应机理
pH适应性
Fenton
degradation
reaction mechanism
ph adaptability
作者简介
张柯(1989-),男,山东济宁人,山东大学实验师,硕士;通信联系人:闫云涛,E-mail:yanyuntao@sdu.edu.cn。
