【作者】 张钰婷； 张秀峰； 杨郡； 张昭；

【Author】 Zhang Yuting Zhang Xiufeng Yang Jun Zhang Zhao School of Chemical Engineering,Sichuan University,Chengdu 610065,China

【机构】 四川大学化工学院；

【摘要】 以工业 TiOSO₄液为钛源,在沸腾条件下水解制得多孔偏钛酸作为载体,以双氧水溶解偏钒酸铵（NH₄VO₃）为浸渍液,浸渍、干燥、煅烧得到不同钒负载量的 V₂O₅/TiO₂催化剂。采用 XRD、XPS 分析和比表面积测试对 V₂O₅/TiO₂催化剂进行了表征,并通过紫外光照下光催化降解亚甲基蓝溶液来测试催化剂光催化性。实验结果表明,水解条件影响载体 TiO₂的比表面积,V₂O₅在锐钛型 TiO₂表面呈非晶态分布;V₂O₅/TiO₂催化剂的比表面积随着 V₂O₅负载量的增加而下降;V₂O₅负载量的增加使 TiO₂由锐钛矿型向金红石型转变的相变温度降低;在实验条件下,V₂O₅负载量为1%的 TiO₂ 催化剂的光催化活性最佳,0.08 g 催化剂3 h 可以使300 ml 浓度为10 mg/L 的亚甲基蓝降解率达到95.5%。更多还原

【Abstract】 Using porous metatitanic acid,which was prepared by hydrolysis of industrial titanyl sulfate （TiOSO₄）solution under boiling condition,as a carder,the aqueous solution consists of hydrogen peroxide and ammonium metavanadate as a pickling agent,the V₂O₅/TiO₂ catalysts with different V₂O₅ content were obtained after the steps of impregnation, dehydration and calcination.The V₂O₅/TiO₂ catalysts were characterized by the techniques of X-ray diffraction（XRD）,XPS and S_BET.The photocatalytic performance of the catalysts was examined by the degradation reaction of methylene blue under ultraviolet irradiation.The experiments show that the hydrolysis conditions effect specific surface area of TiO₂ to a extent;non-crystal V₂O₅ disperses on the surface of anatase TiO₂ without V₂O₅ crystal phase in the V₂O₅/TiO₂ catalysts,specific surface area of V₂O₅/TiO₂ catalysts and temperature of transformation from anatase TiO₂ to ruffle TiO₂ decline with the increase of V₂O₅ loading capacity, rutile TiO₂ was found in the V₂O₅/TiO₂ catalyst with 6%（wt）and 7%（wt）V₂O₅;the photocatalytic performance of V₂O₅ was improved to some extent after the adequate loading of V₂O₅.Under the experimental condition.It was found that the V₂O₅/TiO₂ catalyst with 1%（wt）V₂O₅ have the optimal photocatalysis activity,and the degradation rate of methylene blue achieves to 95.5% after 3 h of photocatalytic reaction when 0.08g V₂O₅/TiO₂ is used in 300 ml solution of 10 mg/L concentration.更多还原