晶面依赖Fe_2O_3电催化降解有机污染物性能研究  

Electro-catalytic degradation of organic pollutants by facets exposed α-Fe_2O_3

作　　者：杨祥龙[1] 沈晚秋 丁星[1] 陈浩[1] YANG Xianglong;SHEN Wanqiu;DING Xing;CHEN Hao(College of Science,Huazhong Agricultural University,Wuhan 430070,China;Key Laboratory of Pesticide&Chemical Biology of Ministry of Education, Institute of Environmental&Applied Chemistry,College of Chemistry, Central China Normal University,Wuhan 430079,China)

机构地区：[1]华中农业大学理学院,武汉430070 [2]华中师范大学化学学院/环境与应用化学研究所/农药与化学教育部重点实验室,武汉430079

出　　处：《华中农业大学学报》2018年第3期61-67,共7页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(21607047;51572101);湖北省青年基金项目(2016CFB193)

摘　　要：采用溶剂热法和水热法分别调控合成2种不同晶面暴露的α-Fe_2O_3,通过X-射线粉末衍射、场发射扫描电子显微镜、高分辨透射电子显微镜等表征手段证实2种α-Fe_2O_3分别为{001}晶面暴露的纳米片和{110}晶面暴露的纳米棒结构。将2种α-Fe_2O_3应用于电-Fenton去除有机污染物,电催化降解测试表明,将2种α-Fe_2O_3分别负载在碳纤维(CF)上作为阴极材料降解罗丹明B、甲基蓝和阿特拉津等有机污染物时,均表现出稳定的去除能力,且{110}晶面暴露的α-Fe_2O_3纳米棒活性远高于{001}晶面暴露的α-Fe_2O_3纳米片。电化学分析结果表明,{110}晶面暴露的Fe_2O_3相比于{001}晶面暴露的α-Fe_2O_3,具有更强的电子传递能力,在通电条件下其表面的Fe(Ⅲ)更容易被还原成Fe(Ⅱ);而生成的Fe(Ⅱ)会进一步促进·OH和·O_2^-等含氧活性物质的生成,进而提高有机污染物的降解效率。Different facets exposedα-Fe2O3 were synthesised and utilized to remove organic contaminants via electric-Fenton method.Systemic characterizations including X-ray diffraction(XRD),scanning electron microscope(SEM)and transimission electron microscope(TEM)reveal that the dominated planes of preparedα-Fe2O3 nanosheets and nanorods are{001}and{110}facets,respectively.Both 001-Fe2O3 and 110-Fe2O3 deposited CF cathode demonstrates sustainable activity for electrocatalytic removal of typical organic pollutants including RhB,MB and atrazine.The activity of 110-Fe2O3 is much higher than that of 001-Fe2O3.This can be attributed to its stronger ability for Fe(Ⅱ)generation based on the corresponding electrochemical analysis,from which the electron transport capacity of 110-Fe2O3 is found to be much higher than that of 001-Fe2O3.The resulting Fe(Ⅱ)thus accelerates the formation of reactive oxygen species like·OH and·O-2,which subsequently promotes the degradation of target contaminants.

关 键 词：Α-FE2O3 晶面暴露 电FENTON 罗丹明B 阿特拉津 

分 类 号：TQ426.8[化学工程] X52[环境科学与工程—环境工程]