A green method to prepare TiO2/MWCNT nanocomposites with high photocatalytic activity and insights into the effect of heat treatment on photocatalytic activity

被引：20

作者：

Zeng, Qingping ^{[1
]}

Li, Hua ^{[1
]}

Duan, Huanan ^{[1
]}

Guo, Yiping ^{[1
]}

Liu, Xuefa ^{[1
]}

Zhang, Yangyang ^{[1
]}

Liu, Hezhou ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

来源：

RSC ADVANCES | 2015年 / 5卷 / 18期

关键词：

ENVIRONMENTAL APPLICATIONS; MWCNT/TIO2; COMPOSITES; TIO2; NANOPARTICLES; GRAPHENE OXIDE; RUTILE TIO2; ANATASE; PHOTODEGRADATION; DEGRADATION; ZNO; ENHANCEMENT;

D O I：

10.1039/c4ra13809k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanocomposites consisting of well-defined anatase TiO2 nanoparticles with an average diameter of 8 nm and multi-walled carbon nanotubes (MWCNTs) were fabricated by a facile two-step hydrothermal method using water as the main solvent, which is friendly to the environment and totally different from previous methods. The TiO2 nanoparticles were uniformly grafted on the surface of MWCNTs via intimate chemical bonds, which was beneficial for the enhancement of photocatalytic activity. The photocatalytic activities of as-prepared TiO2/MWCNT nanocomposites for degradation of rhodamine B under solar simulator illumination were investigated systemically. It was found that the photocatalytic activity of asprepared TiO2/MWCNT nanocomposites was 7 times higher than that of pure TiO2 prepared via the same hydrothermal procedure. The enhancement was mainly due to the existence of MWCNTs, which could not only greatly improve the adsorption of rhodamine B, but also retard the recombination of photogenerated electron-hole pairs and absorb more light. The photocatalytic performance was further enhanced after being annealed at 400 degrees C and 500 degrees C for 1 h because of the improved crystallinity of anatase TiO2. Interestingly, the photocatalytic activities of samples annealed at 400 degrees C and 500 degrees C showed no difference, which was different from previous reports.

引用

页码：13430 / 13436

页数：7

共 38 条

[21] Single wall carbon nanotube scaffolds for photoelectrochemical solar cells.: Capture and transport of photogenerated electrons [J].