期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 212, 期 -, 页码 35-43出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2018.03.002
关键词
PVP; ZnO; Photocatalysis; Dye; Textile wastewater
资金
- Universiti Tunku Abdul Rahman [UTARRF/2016-C2/S03, UTARRF/2017-C1/L02]
- Ministry of Higher Education of Malaysia [FRGS/1/2015/TK02/UTAR/02/2, FRGS/1/2016/TK02/UTAR/02/1]
Flower-like ZnO micro/nanostructures were successfully prepared using a polyvinylpyrrolidone (PVP)-assisted co-precipitation route and characterized by X-ray diffraction (XRD), field emission-scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), fourier transform infrared (FTIR) and photoluminescence (PL) spectroscopy. Smaller sizes of ZnO micro/nanoflowers were synthesized with different amounts of PVP as surfactant. Possible morphology evolution and formation mechanism of the flower-like micro/nanostructures were postulated. Concentrations of PVP in the reaction mixtures served as key role for morphology-controlled synthesis of ZnO as PVP can assist the oriented crystal growth during the synthesis. The as-synthesized ZnO samples prepared at 12.5 mg/mL PVP displayed higher photoactivity for the simultaneous degradation of methyl orange and methyl green mixtures. The photocatalytic tests also indicated that process parameters such as the initial dye concentration and solution pH exerted their individual influences on the dye mixtures degradation. Under determined experimental conditions, 94.1% chemical oxygen demand (COD) removal of dye mixtures was attained after 240 min of reaction. The ZnO photocatalytic degradation of real textile wastewater was then evaluated and a lower COD removal efficiency (similar to 75%) was observed at similar treatment duration. Other real textile wastewater quality parameters of biochemical oxygen demand (BOD5), turbidity, total suspended solid (TSS), colour, ammoniacal nitrogen (NH3-N) and pH were also investigated. (C) 2018 Elsevier B.V. All rights reserved.
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