Enhanced photocatalytic degradation of organic compounds on multiwalled carbon nanotube/TiO2 composites
This paper examined the efficacy with which the multiwalled carbon nanotube (MWCNT)/TiO2 composites reduced charge recombination and enhanced reactivity.A visible-light photocatalyst of MWCNT/TiO2 was synthesized by a two-step method,in which TiO2 was first mounted on MWCNT surface by hydrolysis of tetrabutyl titanate and further crystallized into anatase nanocrystal in a vacuum furnace at 500 ℃.The photocatalytic degradation of organic compounds over the UV and visible-light spectrum regions was investigated.The MWCNT/TiO2 composites were able to absorb a high amount of photo energy in the visible-light region,driving effectively photochemical degradation reactions.There were more ·OH radicals produced by the MWCNT/TiO2 (1∶3) than by pure TiO2 under UV and visible-light irradiation.In the photodegradation of methylene blue,as a model reaction,a signification enhancement in the reaction rate was observed with the MWCNT/TiO2 composite (1∶3),compared to bare TiO2 and the physical mixture of MWCNTs and TiO2.MWCNTs can enhance the photocatalytic activity of TiO2 in two aspects,namely,e(-) transportation and adsorption.This work provides new insight into the fabrication of MWCNT/TiO2 as a high performance visible-light photocatalyst and facilitates its application in photocatalytic degradation of organic compounds.
MWCNT/TiO2 composites visible-light photocatalyst degradation
Donglin Zhao Xin Yang Changlun Chen Xiangke Wang
School of Materials and Chemical Engineering, Anhui University of Architecture, Hefei, Anhui 230601, Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Scien
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
765-765
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）