Fe^(0)/过硫酸盐降解水中四环素的效能及机理  

The degradation efficiency and mechanism of tetracycline in water by Fe^(0)/persulfate system

作　　者：彭博尚 颜智勇[1] 蔡意祥 颜鸣扬 杨霏 黄小洲 PENG Boshang;YAN Zhiyong;CAI Yixiang;YAN Mingyang;YANG Fei;HUANG Xiaozhou(College of Resources and Environment,Hunan Agricultural University,Changsha,Hunan 410128,China;Hunan Academy of Environmental Sciences Environmental Engineering Co.Ltd,Changsha,Hunan 410014,China)

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]湖南省环科院环境工程有限责任公司,湖南长沙410014

出　　处：《湖南农业大学学报（自然科学版）》2022年第4期468-473,共6页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：国家水体污染控制与治理科技重大专项(2014ZX07206001)。

摘　　要：设计pH、Fe0投加量、过硫酸盐(PS)投加量和四环素(TC)初始质量浓度对TC去除率影响的单因素试验,探索Fe^(0)/PS体系降解TC的最适条件;利用单因素试验的结果,采用伪一级动力学模型拟合得到Fe^(0)/PS体系降解TC影响因素的反应级数;通过自由基淬灭试验,探究Fe^(0)/PS体系中自由基的种类;运用液相色谱–质谱探索TC在Fe^(0)/PS体系中的降解产物和降解路径。结果表明:在TC初始质量浓度为30 mg/L时,选择pH=3.0、PS投加量为2.0 mmol/L,Fe0投加量为1.00 mmol/L,温度为25℃的条件,反应45 min后,TC去除率达94.11%;PS投加量、Fe0投加量和TC浓度的反应级数分别为0.93、0.89、–0.78;·OH和SO_(4)^(-)·均参与了对TC的降解,其中SO_(4)^(-)·发挥主要作用;TC在Fe^(0)/PS体系得到有效降解,其降解产物主要有6种化合物,可能存在羟基重排和脱去羟基2种降解路径。A single-factor experiment was designed to investigate the effects of the pH,Fe0 dosage,persulfate(PS)dosage and tetracycline(TC)initial mass concentration on the TC removal rate to explore the optimum conditions for the Fe^(0)/PS system to degrade TC.Using the results of single factor test and pseudo first-order kinetic model,the reaction order of the influencing factors of TC degradation in Fe^(0)/PS system was obtained.The types of free radicals in Fe^(0)/PS system were determined by free radical quenching test.The degradation products and pathways of TC in Fe^(0)/PS system were studied by liquid chromatography-mass spectrometry.The results showed that when the initial mass concentration of 30 mg/L TC,the pH 3.0,at the dosage of PS 2.0 mmol/L,the dosage of Fe01.00 mmol/L and 25 temperature,the removal rate of℃TC reached 94.11%after 45 min.The reaction orders of PS dosage,Fe0 dosage and TC concentration were 0.93,0.89 and-0.78,respectively;·OH and SO_(4)^(-)·were involved in the degradation of TC,in which SO_(4)^(-)·played a major role.TC was effectively degraded in Fe^(0)/PS system,and its degradation products mainly included 6 compounds.There may be two degradation paths:hydroxyl rearrangement and hydroxyl removal in the studied system.

关 键 词：过硫酸盐 零价铁(Fe^(0)) 四环素 去除率 降解机理 

分 类 号：X703[环境科学与工程—环境工程]