BiVO4光催化降解废水中高浓度磺胺嘧啶的研究

以五水合硝酸铋与偏钒酸铵为原料,采用水热反应法制备了不同晶体结构的钒酸铋(BiVO 4)光催化剂,分析了该催化剂对废水中高浓度磺胺嘧啶的处理效果。结果显示:BiVO 4光催化剂为单斜白钨矿型和四方锆石型,呈片状结构且颗粒分散性较好;磺胺嘧啶的光催化降解率与BiVO 4投加量、光照强度和反应时间呈正相关性,与磺胺嘧啶的初始浓度呈负相关性,随着BiVO 4合成pH值的增大呈先升高后下降的趋势;采用BiVO 4光催化剂处理磺胺嘧啶的最优条件为磺胺嘧啶初始浓度10 mg/L、合成pH=5,投加量0.25 g/L、10000 lux紫外光照下反应4 h,最优条件下的磺胺嘧啶平均去除率达到90.97%。

Study on photocatalytic treatment of sulfadiazine in water by BiVO4

A kind of photocatalyst BiVO 4 with different crystal structures was prepared by the hydrothermal method using bismuth nitrate pentahydrate and ammonium metavanadate as raw materials to analyze the photocatalytic effect of BiVO 4 on medium and high concentration sulfadiazine polluted wastewater.The results showed that BiVO 4 photocatalyst was monoclinic scheelite type and quadrate zircon type with flake structure and great particle dispersity.The photocatalyst rate of sulfadiazine was positively correlated with BiVO 4 dosage,UV light intensity and reaction time,but negatively correlated with initial sulfadiazine concentration,and first increased and then decreased with the increase of BiVO 4 synthesis pH.The optimal conditions for the photocatalytic treatment of sulfadiazine by BiVO 4 were initial sulfadiazine concentration of 10 mg/L,synthesis pH of 5,sulfadiazine dosage of 0.25 g/L,UV light intensity of 10000 lux,and reaction time of 4 hour.The removal rate of sulfadiazine under such conditions reached 90.97%.