研究报告
陈渊,杨家添,刘国聪,韦庆敏,曾玉凤,黄小燕.水热法制备BiVO4及其可见光催化降解糖蜜酒精废水[J].环境科学学报,2011,31(5):971-978
水热法制备BiVO4及其可见光催化降解糖蜜酒精废水
- Hydrothermal synthesis of BiVO4 and its photocatalytic degradation of molasses fermentation wastewater under visible light irradiation
- 基金项目：广西教育厅科研项目(No.200808LX406,200911LX368);广西高校优秀人才资助项目(No.G2009033,G2009045);广西科学技术研究和开发项目(桂科攻10100003-2);玉林师范学院重点科研项目(No.2010YJZD)
- 作者
- 单位
- 陈渊
- 1. 玉林师范学院化学与生物系, 玉林 537000; 2. 玉林师范学院新材料研发和化学生物传感技术所, 玉林 537000
- 杨家添
- 玉林师范学院化学与生物系, 玉林 537000
- 刘国聪
- 1. 玉林师范学院化学与生物系, 玉林 537000; 2. 玉林师范学院新材料研发和化学生物传感技术所, 玉林 537000
- 韦庆敏
- 1. 玉林师范学院化学与生物系, 玉林 537000; 2. 玉林师范学院新材料研发和化学生物传感技术所, 玉林 537000
- 曾玉凤
- 玉林师范学院化学与生物系, 玉林 537000
- 黄小燕
- 玉林师范学院化学与生物系, 玉林 537000
- 摘要：以Bi(NO3)3·5H2O为铋源,NH4VO3为钒源,采用简单的水热法制备了BiVO4光催化剂,并用X-射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(IR)和紫外-可见光漫反射光谱(UV-vis)对产品进行了结构表征.同时,在BiVO4光催化降解糖蜜酒精废水反应中考察了催化剂用量、通氧量、溶液pH值、双氧水用量及光照强度对糖蜜酒精废水脱色率的影响.实验结果表明,水热产品属于单斜晶系BiVO4,其带隙能为2.398eV,并具有良好的可见光催化活性.当降解经30倍稀释的糖蜜酒精废水,BiVO4添加量为3.0g·L-1,通氧量为120L·h-1,助氧化剂H2O2添加量为9%,不改变废水pH值,在400W镝灯离液面11cm照射反应180min的条件下,糖蜜酒精废水的脱色率为88.60%,COD去除率为25.84%,而添加5g·L-1的FeSO·47H2O后其脱色率和COD去除率分别提高到90.90%和91.26%.单斜晶型BiVO4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.
- Abstract：Using Bi(NO3)3·5H2O as bismuth source and NH4VO3 as vanadium source,BiVO4 photocatalysts were synthesized via a facile hydrothermal process and characterized using X-ray diffraction(XRD),scanning electron microscopy(SEM),infrared spectroscopy(IR) and UV-vis diffuse reflectance spectroscopy(UV-vis).The as-prepared products were used to photodegrade molasses fermentation wastewater.The effects of BiVO4 dosage,air flow rate,pHof wastewater,H2O2 dosage and the illumination intensity on the wastewater degradation were investigated in detail.The results reveal that the as-prepared BiVO4 is of monoclinic structure with a band gap of 2.398 eVand exhibits an excellent visible-light photocatalytic activity.For the molasses fermentation wastewater with the initial pHvalue,when the flow rate of air is adjusted to 120 L·h-1,the amount of added H2O2 is modulated at 9%,and the concentration of BiVO4 is controlled to 3.0 g·L-1,the decolorization ratio of the molasses fermentation wastewater diluted 1:30 with distilled water is 88.60% and the CODremoval ratio is 25.84% after irradiation by 400 Wvisible light for 180 min.When FeSO4·7H2Owith a concentration of 5 g·L-1 was added,its decolorization ratio and COD removal ratio were increased to 90.90% and 91.26%,respectively.The photocatalysis process of BiVO4 upon the molasses fermentation wastewater is a first-order kinetic reaction.
- Key words：molasses fermentation wastewater BiVO4 hydrothermal method photodegradation decoloration rate COD removal rate
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