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

生态与农村环境学报 ›› 2016, Vol. 32 ›› Issue (5): 818-825.doi: 10.11934/j.issn.1673-4831.2016.05.020

花状BiOBr催化剂制备及对废水底物降解的光催化特性

杨家添, 韦庆敏, 谢秋季, 晏全, 黎中良, 陈渊

玉林师范学院化学与食品科学学院/广西农产品加工重点实验室(培育基地)/广西高校桂东南特色农产资源高效利用重点实验室, 广西玉林 537000

收稿日期:2015-10-06 出版日期:2016-09-25 发布日期:2016-10-08
通讯作者: 陈渊,E-mail:chenyuan197191@163.com E-mail:chenyuan197191@163.com
作者简介:杨家添(1965-),男,广西容县人,高级实验师,主要从事功能材料及其在废水中的应用研究。E-mail:yjt8682@163.com
基金资助:
广西科学研究与技术开发计划（桂科攻1598007-1）；广西教育厅科研项目（KY2015ZD097，LX2014295）；广西理工科学实验中心开放课题（LGZXKF201111）；教授科研启动基金（G20140006）；全国大学生创新创业训练计划（201410606019）

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

YANG Jia-tian, WEI Qing-min, XIE Qiu-ji, YAN Quan, LI Zhong-liang, CHEN Yuan

College of Chemistry and Food Science/Guangxi Key Laboratory of Farm Products Processing(Cultivation Base)/Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin Normal University, Yulin 537000, China

Received:2015-10-06 Online:2016-09-25 Published:2016-10-08

摘要/Abstract

摘要：

以Bi（NO₃）₃·5H₂O为铋源，KBr为溴源，采用水热法调节不同前驱液pH值制备花状BiOBr光催化剂，并用X-射线衍射（XRD）、扫描电子显微镜（SEM）、红外光谱（FTIR）和紫外-可见光漫反射光谱（UV-vis）对产品进行结构表征。同时，在花状BiOBr光催化降解甘蔗糖蜜酒精废水反应中考察了催化剂用量、溶液pH值、通氧量、电子捕获剂用量及光照强度对糖蜜酒精废水脱色率的影响，并进行正交试验优化。结果表明，水热产品均属于四方晶系的BiOBr，其带隙能为2.57~2.65 eV。花状BiOBr能有效降解甘蔗糖蜜酒精废水中的有机物质，废水脱色率显著提高。在400 W金属卤化物灯照射下反应180 min、添加3.0 g·L^-1 BiOBr光催化剂、通氧量为120 L·h^-1（M档）、废水pH值为0.11、电子捕获剂KBrO₃添加量为3.0 g·L^-1、离液面9 cm高度条件下，花状BiOBr光催化降解经30倍稀释的甘蔗糖蜜酒精废水的脱色率为98.5%，COD_Cr去除率为51.8%。四方晶系花状BiOBr晶体的可见光催化糖蜜酒精废水过程符合一级动力学反应。

关键词: 甘蔗糖蜜酒精废水, BiOBr, 光催化降解, 脱色率, COD_Cr去除率

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

中图分类号:

杨家添, 韦庆敏, 谢秋季, 晏全, 黎中良, 陈渊. 花状BiOBr催化剂制备及对废水底物降解的光催化特性[J]. 生态与农村环境学报, 2016, 32(5): 818-825.

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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花状BiOBr催化剂制备及对废水底物降解的光催化特性

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

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