RGO/TiO_2光催化降解2,4-二氯苯氧乙酸研究  

Preparation of RGO/TiO_2 composites materials for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid

作　　者：莫壮洪 黄冬根[1] 全水清[1] 杨天资[1] 刘章斌 刘苗[1] 

机构地区：[1]南昌大学资源环境与化工学院,南昌330031

出　　处：《环境科学学报》2016年第1期178-184,共7页Acta Scientiae Circumstantiae

基　　金：教育部高等学校科技创新工程重大项目培育资金项目(No.708058)~~

摘　　要：通过Hummers法及紫外光/热还原工艺制得还原氧化石墨烯(RGO),采用溶胶-凝胶-煅烧法,以RGO和钛酸酊脂为前驱体制备出RGO/TiO2光催化复合材料,并利用XRD、FT-IR等对其进行了表征.对RGO/TiO2光催化降解性能的研究发现,复合光催化剂RGO/TiO2对2,4-二氯苯氧乙酸(2,4-D)的光催化降解活性显著优于纯TiO2,并且发现负载量和pH值对光催化降解性能有较大的影响:RGO/TiO2投加量为1.2g·L^(-1)、RGO负载量2%、pH为3、初始浓度为50 mg·L^(-1)反应12 h,2,4-D去除率达到98.75%;2,4-D降解率随着RGO/TiO2投加量的增大先增大后减小;RGO/TiO2对2,4-D的降解为脱氯还原和催化氧化过程,产生氯酚、苯酚等中间产物.The reduced graphene oxide（RGO） was synthesized by the methods of Hummers and UV/ thermal reduction process, the RGO/ TiO2 composite photocatalyst materials were prepared through sol-gel-calcination method by using RGO and tetra-n-butyl titanate as precursors. These complexes were characterized by XRD and FT-IR. The studies indicate that composites RGO/ TiO2 exhibited significantly higher photocatalytic activity than pure TiO2 on degradation of 2,4-dichlorophenoxyacetic acid（2,4-D）. The photocatalytic activity of composites RGO/ TiO2 depended on loading rate of RGO and pH value： after 12 h, the degradation of 2,4-D reached 98.75% when the dosage of RGO/ TiO2 was 1.2 g·L-1, the content of RGO was 2%, pH was 3 and the initial concentration of 2,4-D was 50 mg·L-1. The degradation rate of 2,4-D increased first and then decreased with increasing the dosage of RGO/TiO2. The degradation of 2,4-D by RGO/ TiO2 through the process of dechlorination and catalytic oxidation, and produced chlorophenols, phenol and other intermediate products.

关 键 词：紫外光/热还原法 石墨烯 RGO/TiO2复合材料 2 4-二氯苯氧乙酸 光催化降解 

分 类 号：X131[环境科学与工程—环境科学]