Peroxydisulfate‐based Non‐radical Oxidation of Rhodamine B by Fe‐Mn Doped Granular Activated Carbon: Kinetics and Mechanism Study

Author:

Wu Jiahua1,Yang Xuan1ORCID,Xu Dong1,Ong Say Leong12,Hu Jiangyong12

Affiliation:

1. Advanced Water Technology Laboratory National University of Singapore (Suzhou) Research Institute No.377 Linquan Street, Suzhou Industrial Park Suzhou Jiangsu 215123 China

2. Department of Civil & Environmental Engineering National University of Singapore 1 Engineering Drive 2 Singapore 117576 Singapore

Abstract

AbstractWhile numerous persulfate‐based advanced oxidation processes (AOPs) have been studied based on fancy catalysts, the practical combination of Fe or Mn modified granular activated carbon (GAC) has seldom been investigated. The present study focused on a green and readily synthesized Fe−Mn bimetallic oxide doped GAC (Fe−Mn@GAC), to uncover its catalytic kinetics and mechanism when used in the peroxydisulfate (PDS)‐based oxidation process for degrading Rhodamine B (RhB), a representative xenobiotic dye. The synthesized Fe−Mn@GAC was characterized by SEM‐EDS, XRD, ICP‐OES and XPS analyses to confirm its physicochemical properties. The catalytic kinetics of Fe−Mn@GAC+PDS system were evaluated under varying conditions, including PDS and catalyst dosages, solution pH, and the presence of anions. It was found Fe−Mn@GAC exhibited robust catalytic performance, being insensitive to a wide pH range from 3 to 11, and the presence of anions such as Cl, SO42−, NO3 and CO32−. The catalytic mechanism was investigated by EPR and quenching experiments. The results indicated the catalytic system processed a non‐radical oxidation pathway, dominated by direct electron transfer between RhB and Fe−Mn@GAC, with singlet oxygen (1O2) playing a secondary role. The catalytic system also managed to maintain a RhB removal above 81 % in successive 10 cycles, and recover to 89.5 % after simple DI water rinse, showing great reusability. The catalytic system was further challenged by real dye‐containing wastewater, achieving a decolorization rate of 84.5 %. This work not only provides fresh insight into the kinetics and mechanism of the Fe−Mn@GAC+PDS catalytic system, but also demonstrates its potential in the practical application in real dye‐containing wastewater treatment.

Funder

Science and Technology Support Program of Jiangsu Province

Publisher

Wiley

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3