利用氨基三乙酸(NTA)强化零价铁/过碳酸钠(Fe⁰/SPC)的类Fenton法进行去除双酚A(BPA)的研究。分别考察了Fe⁰、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-Fe⁰/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-Fe⁰/SPC体系的pH适用范围;投加的Fe⁰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(R₁²=0.983 4~0.993 3)能更好描述NTA-Fe⁰/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-Fe⁰/sodium percarbonate (NTA-Fe⁰/SPC) is used to remove bisphenol A (BPA) from water at neutral pH.The effects of the dosages of Fe⁰,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-Fe⁰/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-Fe⁰/SPC.The addition of Fe⁰ 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 (R₁²=0.983 4-0.993 3) can describe the removal behavior of BPA in NTA-Fe⁰/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.

曹群(1999-),男,硕士生,研究方向为水处理,915653909@qq.com;郭波(1968-),女,博士,副教授,研究方向为水污染控制与水质保障,通讯联系人,guobo@tyut.edu.cn。