Membrane surface modification with TiO2-graphene oxide for enhanced photocatalytic performance

被引：241
作者：
Gao, Yong [1 ,2 ]
Hu, Meng [1 ]
Mi, Baoxia [1 ]
机构：
[1] Univ Maryland, Dept Civil & Environm Engn, College Pk, MD 20742 USA
[2] Jiangsu Univ Technol, Sch Chem & Environm Engn, Changzhou 213001, Jiangsu, Peoples R China
来源：
JOURNAL OF MEMBRANE SCIENCE | 2014年 / 455卷
基金：
美国国家科学基金会;
关键词：
Photocatalysis; Sunlight; Graphene oxide; TiO2; Surface modification; Layer-by-layer assembly; TIO2-REDUCED GRAPHENE OXIDE; TIO2; NANOCOMPOSITES; REDUCTION; COMPOSITE; PURIFICATION; DEGRADATION; TECHNOLOGY; SEPARATION; FILMS;
D O I：
10.1016/j.memsci.2014.01.011
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Taking advantage of the unique property of graphene oxide (GO) nanomaterials in expanding the light response range of TiO2, we modified the surface of water filtration membranes with TiO2-GO to enhance their photocatalytic activities under both UV and sunlight irradiations. A layer-by-layer approach was employed to sequentially deposit TiO2 nanoparticles and GO nanosheets on a polysullone base membrane, with GO partially reduced via ethanol/UV post-treatment. The grafting of TiO2-GO on the membrane surface was confirmed through the analysis of QCM-D measurements and SEM images. We then studied the photocatalytic properties of the surface-modified membranes in both batch and filtration experiments using methylene blue (MB) as a representative organic contaminant. Compared with polysulfone membranes surface-modified with TiO2 and GO, respectively, the TiO2-GO membrane exhibited significantly improved MB photodegradation kinetics under UV (about 60-80% faster) and sunlight (3-4 Limes faster). Besides, the membrane flux increased as a result of the photo-enhanced hydrophilicity and contaminant degradation. Therefore, surface modification by TiO2-GO grafting provides a very promising route to the fabrication of high-performance photocatalytic membranes for sustainable water treatment. (C) 2014 Elsevier B.V. All rights reserved
引用
收藏
页码：349 / 356
页数：8
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