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论文类型：期刊论文

发表时间：2013-03-01

发表刊物：DESALINATION AND WATER TREATMENT

收录刊物：SCIE

卷号：51

期号：13-15

页面范围：2826-2835

ISSN号：1944-3994

关键字：Photocatalysis; Poly-o-phenylenediamine; Titanium dioxide; Methylene blue; Wastewater treatment

摘要：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 activity was also tested. A plausible mechanism was proposed and discussed on the basis of experimental results.