摘要
煅烧高岭土(calcined kaolin,CK)是一种含量丰富且绿色环保的材料,因其具有催化活性高且活性位点较多的优点,故将其用以活化过一硫酸盐(peroxymonosulfate,PMS)以去除四环素(tetracycline,TC)。结果表明,CK活化PMS去除TC的过程包括吸附和催化降解。溶液初始pH=6、0.5 mmol·L^−1投加量的PMS和0.2 g·L^−1投加量的CK为CK活化PMS去除TC的最佳条件。Cl−、NO3^-、HCO3^-的浓度在0~10 mmol·L^−1时对CK活化PMS去除TC体系基本没有影响,而H2PO4^-对其体系有较大的抑制作用。自由基淬灭实验结果表明,HO·是CK活化PMS去除TC体系中的主要活性基团。通过液相-质谱联用仪检测出12种产物,阐述了4条可能的降解途径。以上结果表明,CK是一种极具潜力且含量丰富的绿色催化剂,其活化PMS后可应用于净化含有机污染物废水。
Calcined kaolin(CK)is an abundant and green material and was used to activate peroxymonosulfate(PMS)for tetracycline(TC)removal due to its high catalytic activity and many active sites.The results showed that the removal process of TC by activated PMS using CK included adsorption and catalytic degradation.The optimal conditions for TC removal were pH=6,the dosages of 0.5 mmol·L^−1 PMS and 0.2 g·L^−1 CK.Cl^−,NO3^- and HCO3^- with the concentration range of 0~10 mmol·L^−1 had slight effect on the TC removal system,while H2PO4^- had a great inhibitory effect on the system.The active radical trapping experiments demonstrated that HO·was the main active species responsible for TC removal.TC was attacked and decomposed by HO·formed the CK surface due to CK activation toward PMS according to the analysis of material characterization.Twelve intermediates were detected by liquid chromatograph-mass spectrometer and four degradation pathways were proposed.This study shows that CK is a green catalyst with great potential and can be applied to purify wastewater containing organic pollutants.
作者
蒋海燕
段毅
刘宇琪
周乐陶
段怡欣
李好
JIANG Haiyan;DUAN Yi;LIU Yuqi;ZHOU Letao;DUAN Yixin;LI Hao(Hunan Province Engineering&Technology Research Center for Rural Water Quality Safety,College of Municipal and Mapping Engineering,Hunan City University,Yiyang 413000,China;School of Civil Engineering,University of South China,Hengyang 421001,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第9期2494-2505,共12页
Chinese Journal of Environmental Engineering
基金
湖南省教育厅一般项目(16C0303,19C0376)
湖南省村镇饮用水水质安全保障工程技术研究中心(2019TP2079)开放基金资助(02)。
关键词
煅烧高岭土
过一硫酸盐
催化
四环素
自由基
降解
calcined kaolin
peroxymonosulfate
catalysis
tetracycline
radical
degradation
