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

作　　者：杨家添[1] 韦庆敏[1] 谢秋季[1] 晏全[1] 黎中良[1] 陈渊[1] 

机构地区：[1]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

出　　处：《生态与农村环境学报》2016年第5期818-825,共8页Journal of Ecology and Rural Environment

基　　金：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)

摘　　要：以Bi（ N0 3 ）3·5 H20 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. 5 7 - 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120L . 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3 0 倍稀释的甘蔗糖蜜酒精废水的脱色率为98. 5%,CODCr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.With Bi( NO_3)_3·5H_2O as bismuth source and KBr as bromine source,floriform photocatalyst of Bi OBr was synthesized using the hydrothermal method to adjust p H 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 Bi OBr,p H of the wastewater,aeration rate,dosage of KBr O_3 and intensity of illumination on decoloration rate of the wastewater. Results show that the hydrothermal products were all Bi OBrs of the tetragonal crystal system with a band gap energy being 2. 57-2. 65 e V. The floriform Bi OBr 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 p H 0.11,Bi OBr 3. 0 g·L-1,KBr O33. 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 CODCrremoval rate reached 51. 8%. The photocatalysis process fits the first-order kinetic reaction.

关 键 词：甘蔗糖蜜酒精废水 BiOBr 光催化降解 脱色率 CODCR去除率 

分 类 号：TQ032.4[化学工程] X703.1[环境科学与工程—环境工程]