期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 184, 期 -, 页码 248-256出版社
ELSEVIER
DOI: 10.1016/j.seppur.2017.04.025
关键词
Photocatalysis; Photoinduced charge separation; Hydrogen generation; Grey-TiO2; Polyaniline
资金
- National Natural Science Foundation of China [21501023, 21401018, 51104042]
The highly efficient composite photocatalysts composed of grey-TiO2 and electrically conductive polyani-line (PANI) have been fabricated through an in situ polymerization of aniline in the presence of grey-TiO2 nanoparticles. The grey-TiO2 nanoparticles were prepared via a chemical reduction method by reducing bare white-TiO2 nanoparticles with aluminium powder under nitrogen, atmosphere. The morphology, crystalline structure and optical property of these PANI sensitized grey-TiO2 nanocomposites were investigated, and their photocatalytic activity in the phtocatalytic hydrogen generation and photodegradation of Rhodamine B were evaluated. Compared with grey-TiO2, the PANI/grey-TiO2 nanocomposites showed obviously improved photocatalytic efficiency both in the hydrogen production and the degradation of Rhodamine B. The hydrogen generation rate under simulated sunlight irradiation for PANI/grey-TiO2 nanocomposites was higher than that of most reported TiO2-based species. The photocatalytic mechanism analyses indicated that the PANI served as co-catalysts in promoting separation of photoinduced charges, and photoelectrons and holes.can transfer efficiently at interface of PANI and grey-TiO2, and thus inhibited the recombination of photo generated electron-hole pairs. This article elucidated a promising colored TiO2 based system, which can be applied in the photocatalytic reactors induced by sunlight irradiation. (C) 2017 Elsevier B.V. All rights reserved.
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