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- Title
Photocatalytic degradation of aqueous rhodamine B by TiO<sub>2</sub>/ZnO/rGO nanocomposite: photocatalytic activity and catalytic mechanism.
- Authors
Lu Peng; Peng Nian; Jingwei Feng; Xiangxiang Han; Binhua Cui; Songsheng Lu; Jie Zhang; Chenming Li; Aiyong Zhang
- Abstract
A novel nanocatalyst, TiO2/ZnO/rGO, was successfully synthesized by hydrothermal method and characterized with X-ray diffractometer, Brunauer–Emmett–Teller, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, X-ray photoelectron spectroscopy and Raman spectra. The photocatalytic activities of the as-obtained nanocatalyst were investigated based on the degradation of rhodamine B (RhB) under UV irradiation. The results showed that the TiO2/ZnO/rGO nanocatalyst could significantly improve the degradation efficiency of RhB when the mass ratio of TiO2 to ZnO was 5:1 and the GO content was 5%. An approximately 100% of photocatalytic degradation of RhB in 90 min was achieved at 5 mg L–1 of initial RhB concentration, 150 mg L–1 of TiO2 /ZnO/rGO dosage and 8.5 of pH under UV light irradiation. The photocatalytic degradation of RhB was well fitted to the pseudo-first-order kinetic equation. Photocatalytic degradation of RhB by TiO2/ZnO/rGO nanocatalyst mainly attributed to the reactive species of O2●–, ●OH and HO2●. Moreover, the degradation intermediates of RhB were detected by GC-MS and the photocatalytic degradation mechanism for RhB was proposed. N-deethylation, conjugate structure destruction, ring opening and hydroxylation were involved in the photocatalytic degradation process of RhB.
- Publication
Desalination & Water Treatment, 2019, Vol 154, p268
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2019.24040