A green method to prepare TiO2/MWCNT nanocomposites with high photocatalytic activity and insights into the effect of heat treatment on photocatalytic activity
A green method to prepare TiO2/MWCNT nanocomposites with high photocatalytic activity and insights into the effect of heat treatment on photocatalytic activity
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制备高光催化活性TiO2/MWCNT纳米复合材料的绿色方法及热处理对光催化活性的影响研究
DOI：
10.1039/c4ra13809k
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发表时间：
2015-01
期刊：
影响因子：
3.9
通讯作者：
Liu Hezhou
中科院分区：
文献类型：
--
作者：
Zeng Qingping;Li Hua;Duan Huanan;Guo Yiping;Liu Xuefa;Zhang Yangyang;Liu Hezhou
以水为主要溶剂，采用简单的两步水热法制备了由平均粒径为8 nm的TiO 2纳米粒子和多壁碳纳米管（MWCNTs）组成的纳米复合材料。TiO 2纳米粒子通过紧密的化学键均匀接枝在MWCNTs表面，有利于提高MWCNTs的光催化活性。系统研究了太阳模拟光照射下TiO 2/MWCNT纳米复合材料对罗丹明B的光催化降解性能。结果表明，所制备的TiO 2/MWCNT纳米复合材料的光催化活性是相同水热法制备的纯TiO 2的7倍。这种增强作用主要是由于MWCNTs的存在，MWCNTs不仅可以大大提高罗丹明B的吸附，而且可以延缓光生电子-空穴对的复合，吸收更多的光。在400 °C和500 °C下退火1 h后，TiO 2的光催化性能进一步提高，这是因为TiO 2的结晶度得到了改善。有趣的是，在400 °C和500 °C下退火的样品的光催化活性没有显示出差异，这与以前的报道不同。
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 as-prepared 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 °C and 500 °C for 1 h because of the improved crystallinity of anatase TiO2. Interestingly, the photocatalytic activities of samples annealed at 400 °C and 500 °C showed no difference, which was different from previous reports.
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DOI：
10.1080/1536383x.2012.690458
发表时间：
2014-03-01
影响因子：
2.3
作者：
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DOI：
10.1016/j.msec.2007.10.002
发表时间：
2008-01-01
期刊：
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
影响因子：
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