Bi_2O_3/g-C_3N_4复合催化剂的制备及其性能研究  

Study on the preparation and properties of Bi_2O_3/ g-C_3N_4 composite photocatalysts

作　　者：张文保[1] 崔玉民[1,2] 李慧泉[1,2] 苗慧[1,2] 陶栋梁[1,2] 孙倩[1] 

机构地区：[1]阜阳师范学院化学与材料工程学院,安徽阜阳236037 [2]安徽环境污染物降解与监测省级实验室,安徽阜阳236037

出　　处：《阜阳师范学院学报（自然科学版）》2015年第1期29-34,共6页Journal of Fuyang Normal University(Natural Science)

基　　金：安徽省自然科学基金项目(No.1408085MB35);安徽省高校优秀青年人才基金重点项目(No.2013SQRL058ZD);安徽省高等学校省级自然科学研究重点项目(No.KJ2014A191);阜阳师范学院科技成果孵化基金项目(No.2013KJFH01;2013KJFH03);阜阳师范学院校企合作实践教育基地(No.2013SJJD05);大学生创新创业训练计划项目(No.AH201310371005)

摘　　要：分别以硫脲、尿素、二氰二胺为前驱体,采用热解法合成g-C3N4,再将其与Bi2O3以不同质量比复合煅烧制备Bi2O3/g-C3N4光催化剂,并用XRD、紫外-可见光谱、光致发光光谱等对其进行了表征。以甲基橙为光催化反应的模型化合物,评价了Bi2O3/g-C3N4光催化剂的紫外光催化活性。探索添加不同清除剂(异丙醇、草酸铵、对苯醌、H2O2酶)后对紫外光催化活性的影响;以对苯二甲酸作为探针分子,结合化学荧光技术研究了Bi2O3/g-C3N4光催化剂表面羟基自由基的生成。实验结果表明:(1)在450℃下煅烧硫脲制备的g-C3N4具有较高的光催化活性;(2)当g-C3N4在Bi2O3/g-C3N4复合光催化剂中质量百分率为80%时,Bi2O3/g-C3N4的光催化活性最高,甲基橙的光催化降解率达到59.1%。Using thiourea,urea and dicyanodiamine as the precursors respectively,g-C3N4 was prepared by a pyrolysis method. The Bi2O3/ g-C3N4 composite photocatalysts with various weight percents of Bi2O3 were successfully prepared by a calcination process,characterized by XRD,UV-Vis and PL etc and evaluated by the photo-degradation of methyl orange（ MO） in an aqueous solution under the irradiation of ultraviolet（ UV） light. The effects of a series of scavengers on the photocatalytic activities of ultraviolet light were investigated. The formation of hydroxyl radical on the surface of Bi2O3/ g-C3N4 of heterogeneous photocatalysts was studied by terephthalic acid as the probe molecule,combined with fluorescence technique. The experimental results show that gC3N4 of photocatalyst prepared by thiourea calcined at 450 ℃ is higher photocatalytic activity. When the weight percent of g-C3N4 in the composite photocatalyst of Bi2O3/ g-C3N4 is 80%,the photocatalytic activity of Bi2O3/ g-C3N4 is the highest,and the photocatalytic degradation rate of methyl orange can reach 59. 1%.

关 键 词：g-C3N4 BI2O3 光催化 清除剂 甲基橙 

分 类 号：O643[理学—物理化学]