VIS-light-induced photocatalytic degradation of methylene blue (MB) dye using PoPD/TiO2composite photocatalysts

Autor:	De-Ying Zhao, Wen-Feng Jiang, Hui-Long Wang
Rok vydání:	2013
Předmět:	Aqueous solution Materials science Composite number Ocean Engineering Photochemistry Pollution Catalysis chemistry.chemical_compound chemistry Titanium dioxide Photocatalysis Degradation (geology) Irradiation Methylene blue Water Science and Technology
Zdroj:	Desalination and Water Treatment. 51:2826-2835
ISSN:	1944-3986 1944-3994
DOI:	10.1080/19443994.2012.750789
Popis:	In this study, the photocatalytic degradation of methylene blue (MB) was studied experimentally over poly-o-phenylenediamine/TiO2 composite (PoPD/TiO2) photocatalysts irradiated with a light source simulating solar light. The effect of operational parameters, i.e. pH of the solution, photocatalyst content, irradiation time, initial MB concentration, and temperature, on the photocatalytic degradation efficiency was explored and the results obtained were fitted with Langmuir-Hinshelwood model to investigate the degradation kinetics and discussed in detail. Results show that the PoPD/TiO2 composites exhibit significantly higher photocatalytic activity than that of pure TiO2 on the degradation of MB aqueous solution under visible light irradiation. The enhanced photocatalytic activity of PoPD-sensitized TiO2 composite catalysts can be attributed to the charge transfer from PoPD to TiO2 and efficient separation of e−–h+ pairs on the interface of PoPD and TiO2. The repeatability of photocatalytic activ...
Databáze:	OpenAIRE
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