负载型零价铁对水体中2,4,6-三氯苯酚的去除  

Removal of 2,4,6-trichlorophenol in Water by Supported Zero Valent Iron

作　　者：冯馨 张衡 王传娅 刘晓馨 毛卉[1,2] 赵仕林 廖洋[1,2] FENG Xin;ZHANG Heng;WANG Chuanya;LIU Xiaoxin;MAO Hui;ZHAO Shilin;LIAO Yang(College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610066,Sichuan;Key Laboratory of Ministry of Education for Southwest Land Resource Evaluation and Monitoring,Chengdu 610066,Sichuan)

机构地区：[1]四川师范大学化学与材料科学学院,四川成都610066 [2]西南土地资源评价与监测教育部重点实验室,四川成都610066

出　　处：《四川师范大学学报（自然科学版）》2018年第5期654-661,共8页Journal of Sichuan Normal University（Natural Science）

基　　金：国家自然科学基金(41641010和21406147);四川省科技支撑项目(2016NZ0053);成都市科技局项目(2014-HM01-00204-SF)

摘　　要：以壳聚糖接枝杨梅单宁(CS-T)为载体,硼氢化钠为还原剂,制备负载型零价铁催化剂(Fe0/CS-T);通过傅里叶红外光谱(FTIR)、X射线衍射(XRD)、透射电镜(TEM)、热重分析仪(TGA)对负载型零价铁催化剂的物理性质与结构进行了表征,零价铁分散于壳聚糖接枝杨梅单宁载体上,直径200~500nm.研究其对水环境中2,4,6-三氯苯酚(2,4,6-TCP)的去除,结果表明:2,4,6-TCP在Fe0/CS-T的作用下发生了脱氯反应,脱氯率为60%左右,反应动力学符合Langmuir-Hinshelwood动力学模型,为表面反应;当材料投加量为0.2g、初始pH值为7、反应温度为25℃、反应时间为2h、2,4,6-TCP的初始质量浓度为20mg·L-1时,去除率为88.94%;在重复使用6次材料后,去除率从88.94%降到57.19%.The supported zero valent iron catalyst(Fe 0/CS-T)was prepared by using biomass resource chitosan grafting bayberry tannin as carrier and using NaBH 4 as reducing agent.The structure and physical properties of supported zero valent iron catalysts were characterized by fourier transform infrared spectrometer(FTIR),X-ray diffractometer(XRD),transmission electron microscope(TEM),and thermo gravimetric analyzer(TGA).The result showed that zero valent iron was dispersed on the carrier,and the size of the zero valent iron particle was 200-500 nm.The experiments were carried out for the removal of 2,4,6-trichlorophenol by this material.The results indicated that the dechlorination reaction happened with Fe 0/CS-T,and the rate of dechlorination was about 60%.The kinetics of the reaction was in accordance with Langmuir-Hinshelwood kinetic model and it was a surface reaction.The optimum reaction conditions were that the dosage of Fe 0/CS-T was 0.2 g,initial pH was 7,temperature was 25℃,reaction time was 2 h,the initial concentration of 2,4,6-TCP was 20 mg·L-1,and the removal rate was 88.94%.The removal rate decreased from 88.94%to 57.19%when the material was reused for 6 times.

关 键 词：壳聚糖接枝杨梅单宁 零价铁 2 4 6-三氯苯酚 还原脱氯 

分 类 号：X592[环境科学与工程—环境工程]