NTA-零价铁/过碳酸钠的非均相类Fenton体系去除水中双酚A的研究  

A heterogeneous Fenton⁃like system with nitrilotriacetic acid⁃Fe0/sodium percarbonate for removal of bisphenol A from water

作　　者：曹群 郭波[1] 冯凡 金史怡 CAO Qun;GUO Bo;FENG Fan;JIN Shi-yi(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024

出　　处：《现代化工》2024年第S01期159-165,共7页Modern Chemical Industry

基　　金：山西省专利转化专项计划项目(202202055)。

摘　　要：利用氨基三乙酸(NTA)强化零价铁/过碳酸钠(Fe^(0)/SPC)的类Fenton法进行去除双酚A(BPA)的研究。分别考察了Fe^(0)、SPC和NTA的投加量、初始pH值以及温度对BPA去除效果的影响。结果显示,在室温、pH=7以及优化投加量的条件下反应30 min,NTA-Fe^(0)/SPC体系对BPA的去除率可达到98.8%。不同方法的对比研究以及反应中铁离子浓度的测定结果表明,NTA与铁离子的络合维持了体系中稳定浓度的Fe(Ⅱ),从而拓宽了NTA-Fe^(0)/SPC体系的pH适用范围;投加的Fe^(0)不仅提供了催化剂Fe(Ⅱ),同时还可加速反应中Fe(Ⅱ)/Fe(Ⅲ)的循环,提高利用率。自由基淬灭实验结果表明,去除BPA的主要作用来自于·OH。伪一级动力学模型(R_(1)^(2)=0.9834~0.9933)能更好描述NTA-Fe^(0)/SPC去除BPA的行为,表明该过程以化学氧化为主,表观活化能为34.68 kJ/mol,属于表面控制的反应。热力学研究显示,去除BPA的反应是自发和吸热的过程。本研究为近中性条件下去除BPA提供了一种高效且环境友好的方法。A heterogeneous Fenton⁃like system with nitrilotriacetic acid⁃Fe^(0)/sodium percarbonate(NTA⁃Fe^(0)/SPC)is used to remove bisphenol A(BPA)from water at neutral pH.The effects of the dosages of Fe^(0),SPC and NTA,initial pH,and temperature on the removal of BPA are respectively investigated.Results show that the removal rate of BPA can reach 98.8%after 30 min reaction in NTA⁃Fe^(0)/SPC system under the optimized dosages at a pH of 7 and room temperature.The comparison of different treatments and the change of iron ion concentration during the reaction indicate that the complexation between NTA and iron ion maintains a stable concentration of Fe(Ⅱ)in the system,and hence broadens the application of pH range in NTA⁃Fe^(0)/SPC.The addition of Fe^(0)provides the source of Fe(Ⅱ)as the catalyst,and also can accelerate the cycling of Fe(Ⅱ)/Fe(Ⅲ)in the reaction,improving the utilization of Fe.Free radical quenching experiment implies that·OH plays a main role in removing BPA.The pseudo⁃first⁃order kinetic model(R21=0.9834-0.9933)can describe the removal behavior of BPA in NTA⁃Fe^(0)/SPC better,indicating that the process is mainly controlled by chemical oxidation.The value of apparent activation energy is 34.68 kJ·mol-1,implying a surface⁃controlled reaction.Thermodynamic study indicates that the removal reaction of BPA in the system is a spontaneous and endothermic process.This study provides an efficient and eco⁃friendly method for BPA removal at neutral pH.

关 键 词：氨基三乙酸 零价铁 过碳酸钠 双酚A 羟基自由基 

分 类 号：X703.1[环境科学与工程—环境工程]