纳米零价铁/过硫酸盐去除2,4-二氯酚的动力学研究  

Kinetics of 2,4-dichlorophenol removal by nano-zero-valent iron/persulfa

作　　者：张永祥[1] 赵崇辉 李雅君 杜伟 te ZHANG Yong-xiang;ZHAOChong-hui;LI Ya-jun;DU Wei(Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Department of Urban Construction,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,水质科学与水环境恢复工程北京市重点实验室,北京100124

出　　处：《应用化工》2023年第10期2756-2760,2765,共6页Applied Chemical Industry

基　　金：国家重点研发计划(2016YFC0401404)。

摘　　要：为更好地理解纳米零价铁(nZVI)激活过硫酸盐(PS)的机制和动力学,基于Langmuir-Hinshelwood机理,结合nZVI/PS体系中主要的反应步骤对2,4-二氯酚(2,4-DCP)的降解过程建立动力学模型。使用不同影响因素下(包括nZVI投加量、初始PS浓度和初始2,4-DCP浓度)PS,2,4-DCP浓度变化数据拟合动力学模型并确定速率常数,通过对速率常数的敏感性分析得到:2,4-DCP降解的整体反应动力学是由前体表面复合物内部发生电子转移反应形成硫酸根自由基SO_(4)^(·-)以及2,4-DCP被羟基自由基OH·降解这两个过程来控制的。TObetter understand the mechanism and kinetics of peroxynitrite(PS)activation by nano-zero-valent iron(nZVI),a kinetic model of the degradation process of 2,4-dichlorophenol(2,4-DCP)was developed based on the Langmuir-Hinshelwood mechanism in conjunction with the main reaction steps in the nZVI/PS system.The kinetic model was fitted and the rate constants were determined using the data of PS,2,4-DCP concentration variation under different influencing factors(including nZVI dosing,initial PS concentration and initial 2,4-DCP concentration),and the sensitivity analysis of the rate constants yielded that the overall reaction kinetics of 2,4-DCP degradation is composed of the formation of sulfate radicals SO_(4)^(·-) by electron transfer reactions within the precursor surface compleXand the degradation of 2,4-DCP by hydroxyl radicals OH·.

关 键 词：2 4-二氯酚 纳米零价铁/过硫酸盐 动力学模型 

分 类 号：TQ050.4[化学工程] X703.1[环境科学与工程—环境工程]