硼掺杂零价铁活化过硫酸盐降解水中阿特拉津  

Boron doped zero valent iron activates persulfate to degrade atrazine in water

作　　者：张子鹤 王娜娜 张雨禾 徐西蒙 ZHANG Zihe;WANG Nana;ZHANG Yuhe;XU Ximeng(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《农业环境科学学报》2025年第1期153-162,共10页Journal of Agro-Environment Science

基　　金：云南省重点研发计划项目(202203AC100004)。

摘　　要：为了处理因大范围使用阿特拉津(ATZ)而造成的水体污染问题,本研究通过硼氢化钠还原Fe_(2)O_(3)制备了硼掺杂零价铁(BZVI),活化过硫酸盐(PDS)以去除水中的ATZ。探讨了PDS投加量、B-ZVI投加量、溶液初始pH值、以及共存离子和实际水体对ATZ降解的影响。结果显示,ATZ的降解符合准一级反应动力学。在25℃,ATZ浓度22 mg·L^(-1),B-ZVI投加量0.3 g·L^(-1),PDS投加量2.02 g·L^(-1),以及溶液初始pH=6.0的条件下,ATZ的15 min去除率达到97.9%。自由基淬灭实验和电子顺磁共振(EPR)实验证实,硫酸根自由基和羟基自由基是降解ATZ的主导活性氧物种。PDS的活化反应包括均相和非均相过程,掺杂的硼可以同时促进溶液中和催化剂表面的Fe(Ⅱ)/Fe(Ⅲ)循环反应,从而加速活化PDS降解ATZ。In order to address the water pollution caused by the widespread use of atrazine(ATZ),this study prepared boron doped zero valent iron(B-ZVI)by reducing Fe_(2)O_(3) with sodium borohydride,and activated persulfate(PDS)to remove ATZ from water,explored the effects of PDS dosage,B-ZVI dosage,initial pH value of the solution,coexisting ions,and actual water on ATZ degradation.The results showed that the degradation of ATZ followed quasi first order reaction kinetics.Under the conditions of 25℃,ATZ concentration of 22 mg·L^(-1),B-ZVI dosage of 0.3 mg·L^(-1),PDS dosage of 2.02 g·L^(-1),and initial pH of 6.0,the removal rate of ATZ reached 97.9% in 15 minutes.The free radical quenching experiment and electron paramagnetic resonance(EPR)experiment confirmed that sulfate radical and hydroxyl radical were the dominant reactive oxygen species for degrading ATZ.The activation reaction of PDS included both homogeneous and heterogeneous processes,and doped boron could simultaneously promote the Fe(Ⅱ)/Fe(Ⅲ)cycling reaction between the solution and the catalyst surface,thereby accelerating the degradation of ATZ by PDS activation.

关 键 词：硼掺杂零价铁 阿特拉津 过硫酸盐 高级氧化 

分 类 号：X52[环境科学与工程—环境工程]