花状BiOBr催化剂制备及对废水底物降解的光催化特性

doi:10.11934/j.issn.1673-4831.2016.05.020

Abstract

Abstract:

With Bi(NO₃)₃·5H₂O as bismuth source and KBr as bromine source, floriform photocatalyst of BiOBr was synthesized using the hydrothermal method to adjust pH of precursor solutions and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared spectrometer(FTIR) and UV-vis diffuse reflectance spectroscopy (UV-vis). Meanwhile, the floriform photocatalyst was tested in photodegrading sugarcane molasses alcohol wastewater for effects of dosage of BiOBr, pH of the wastewater, aeration rate, dosage of KBrO₃ and intensity of illumination on decoloration rate of the wastewater. Results show that the hydrothermal products were all BiOBrs of the tetragonal crystal system with a band gap energy being 2.57-2.65 eV. The floriform BiOBr is capable of degrading effectively organic pollutants in sugarcane molasses alcohol wastewater, with a high decoloration rate. To treat 1∶30-diluted sugarcane molasses alcohol wastewater, the optimum running conditions were set as pH 0.11, BiOBr 3.0 g·L^-1, KBrO₃ 3.0 g·L^-1, aeration rate 120 L·h^-1(medium in rate), 180 min illumination under a 400 W metal halide lamp, 9 cm above the surface of the solution. In this case, the decoloration rate of the wastewater was 98.5% and the COD_Cr removal rate reached 51.8%. The photocatalysis process fits the first-order kinetic reaction.

Key words: sugarcane molasses alcohol wastewater, BiOBr, photodegradation, decoloration rate, COD_Cr removal rate

CLC Number:

YANG Jia-tian, WEI Qing-min, XIE Qiu-ji, YAN Quan, LI Zhong-liang, CHEN Yuan. Preparation of Floriform BiOBr and Its Photocatalytic Characteristics in Degrading Wastewater Substrate[J]. Journal of Ecology and Rural Environment, 2016, 32(5): 818-825.

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Preparation of Floriform BiOBr and Its Photocatalytic Characteristics in Degrading Wastewater Substrate

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