纳米Fe3O4负载聚苯胺对染料的协同催化降解  

Load of PANI on nano-Fe_3O_4 and synergy catalytic degradation of dyes

作　　者：严梅[1] 张青[1] 谢慧芳[1] 孔金明[1] 曲虹霞[2] YAN Mei;ZHANG Qing;XIE Hui-fang;KONG Jin-ming;QU Hong-xia(Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

机构地区：[1]南京理工大学环境与生物工程学院,江苏省化工污染控制与资源化重点实验室,江苏南京210094 [2]南京理工大学化工学院,江苏南京210094

出　　处：《中国环境科学》2017年第4期1394-1400,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(21575066)

摘　　要：通过Hemin催化聚合苯胺工艺在纳米Fe_3O_4上负载导电聚合物聚苯胺(PANI),制备得到了具有高效催化活性的异相类Fenton反应用的催化剂PANI@Fe_3O_4.研究了PANI@Fe_3O_4/H_2O_2体系中罗丹明B(RhB)浓度、H_2O_2浓度、PANI@Fe_3O_4投加量、pH值以及·OH捕获剂对RhB降解的影响.结果表明,对于400mg/L的RhB溶液,当催化剂投加量为0.5g/L,H_2O_2浓度为0.04mol/L时,PANI@Fe_3O_4/H_2O_2可在pH3.75~12.0间达到98%以上的去除率,H_2O_2的利用率达到80%.将该体系对于初始COD为1715mg/L模拟混合染料废水,可去除70%的C0D,PANI@Fe_3O_4/H_2O_2体系适用pH值范围广,催化活性高,H_2O_2利用率高且水相中残留铁离子少.机理分析表明,在PANI@Fe_3O_4中PANI和纳米Fe_3O_4存在明显的协同效应,纳米Fe_3O_4部分溶解释放出Fe^(2+),并通过Fe^(3+)和Fe^(2+)间的快速电子转移补充催化所需Fe^(2+).PANI提供反应所需H^+,并通过与铁离子形成配位键而减少了铁离子释放到水相中.In this study,polyaniline/nano Fe3O4was synthesized via in situ polymerization of aniline in the presence ofnano Fe3O4by Hemincatalysis and was used as an efficient heterogeneous Fenton-like catalyst for dyes degradation.The catalytic activity was evaluated by factors in PANI@Fe3O4/H2O2system,such as initial concentration of dye(Rhodamine B,RhB),concentration of H2O2and pH.For RhB of400mg/L,more than98%removal ratios were obtained from pH3.75to12.0with0.5g/L PANI@Fe3O4,0.04mol/L H2O2,and the utilization efficiency of H2O2was as high as80%.The removal ratio of COD could reached70%for the mixed dyes wastewater with initial COD1715mg/L in PANI@Fe3O4/H2O2system.Results showed that PANI@Fe3O4/H2O2system have some advantagessuch as wide pH range,high catalytic activity,high utilization efficiency of H2O2and low iron concentration in water.There was a synergy effect between PANI and nano-Fe3O4in PANI@Fe3O4composite was observed.The dissolution of Fe3O4provide Fe2+and rapid electron transfer from Fe3+to Fe2+,which play the significant role in the formation of?OH.PANI provide H+for the Fenton reaction and prevent leaching of Fe2+/3+by chelating.

关 键 词：异相类Fenton反应 PANI@Fe3O4 催化剂 协同效应 罗丹明 

分 类 号：X703.5[环境科学与工程—环境工程]