Synergistic effect of photocatalysis and adsorption of nano-TiO2 self-assembled onto sulfanyl/activated carbon composite
- 501 Downloads
We report a significant synergistic effect of photocatalysis and adsorption by depositing 3–6 nm TiO2 particles onto sulfanyl (HS)/activated carbon composite using molecular self-assemble method in low-temperature aqueous system. The synergistic effect was studied by comparing pure TiO2 and TiO2/sulfanyl/activated carbon composite to photocatalytic degrade methylene blue (MB) in a quartz glass reactor. The results showed that the photocatalytic activity of the TiO2/HS/AC composite compared to pure TiO2 has been greatly enhanced calculated from a simulated first-order kinetics model. The synergistic enhancement at low MB concentration was significantly stronger than that at high concentration, and the synergistic effect calculated from the model at initial concentration of 1 mg/L was approximately 64 times than at initial concentration of 15 mg/L. This is because when the adsorption rate was much faster than the photocatalytic degradation rate, strong adsorption of MB molecules may inhibit subsequent photocatalytic degradation reaction. The enhancement was found mainly due to the strong synergistic effect of the adsorption of MB of sulfanyl/activated carbon substrate and the photocatalysis of TiO2 nanoparticles.
KeywordsTiO2 Adsorption Photocatalysis Synergistic effect
This work was supported by the Natural Science Foundation of China (No. 41372054).
- Lee MS, Lee JD, Hong SS (2005) Photocatalytic decomposition of acetic acid over TiO2 and TiO2/SiO2 thin films prepared by the sol-gel method. J Ind Eng Chem 11(4):495–501Google Scholar
- Li N (2011) Study on photocatalysis reduction silver ions of nano FeOOH/TiO2 self-assembled film. Wuhan University of Technology, MasterGoogle Scholar
- Li Y, Song Z, Li Z, Ouyang Y, Yan W (2007) Preparation and photocatalytic properties of activated carbon supported TiO2 nanoparticles with Cu ions doping. Chemical Journal of Chinese Universities-Chinese Edition 28(9):1710Google Scholar
- Li Y, Zhou X, Chen W, Li L, Zen M, Qin S, Sun S (2012) Photodecolorization of Rhodamine B on tungsten-doped TiO2/activated carbon under visible-light irradiation. J Hazard Mater 227:25–33Google Scholar
- Xiao Y, Xu S, Li Z, An X, Zhou L, Zhang Y, Shiang FQ (2010) Progress of applied research on TiO2 photocatalysis-membrane separation coupling technology in water and wastewater treatments. Review Environmental Science & Technology 55(14):1345–1353Google Scholar