Bi_(0.5)Na_(0.5)TiO_3的制备及光催化性能研究  

Study on the preparation and photocatalytic properties of Bi_(0. 5)Na_(0. 5)TiO_3

作　　者：崔玉民[1,2] 朱云[1] 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：《化学研究与应用》2014年第12期1918-1924,共7页Chemical Research and Application

基　　金：安徽省自然科学基金项目(1408085MB35);安徽省高校优秀青年人才基金重点项目(2013SQRL058ZD);安徽省高等学校省级自然科学研究重点项目(KJ2014A191);阜阳师范学院科技成果孵化基金项目(2013KJFH01;2013KJFH03);阜阳师范学院校企合作实践教育基地(2013SJJD05);大学生创新创业训练计划项目(AH201310371005);阜阳师范学院科研机构校级委托专项课题(2014HJJC03)

摘　　要：以Bi(NO3)3·5H2O、Na OH、Ti(OC4H9)4为原料,采用水热法制备Bi0.5Na0.5Ti O3纳米光催化剂。用XRD、TEM表征了Bi0.5Na0.5Ti O3光催化剂的结构和形貌。以亚甲基蓝为模型污染物,考察了不同浓度的Na OH对Bi0.5Na0.5Ti O3晶体在紫外光和可见光照射下光催化活性的影响。通过荧光技术研究了Bi0.5Na0.5Ti O3光催化剂表面羟基自由基的生成,探究了清除剂对光催化降解污染物活性的影响。结果表明:Na OH的浓度对Bi0.5Na0.5Ti O3光催化剂的紫外光和可见光活性有很大的影响,当Na OH浓度为8mol·L-1时制备的Bi0.5Na0.5Ti O3晶体光催化活性最高,光照1h,亚甲基蓝的紫外及可见光催化降解率分别达到69.8%、53.4%,在光催化降解过程中·O2ˉ和·OH起主要作用,尤其是·O2-起了重要作用。Using Bi（NO3）3·5H2O,NaOH and Ti（OC4H9）4as raw material,Bi0.5Na0.5TiO3of nano-photocatalyst was prepared by hydrothermal method. The structure and morphology of Bi0. 5 Na0. 5 TiO3 were characterized by means of XRD and TEM. The photocata-lytic activities of Bi0. 5 Na0. 5 TiO3 prepared with different concentration of sodium hydroxide had been evaluated by photocatalytic deg-radation of methylene blue under UV and visible light. The formation of hydroxyl free radicals on the surface of Bi0. 5 Na0. 5 TiO3 was studied by chemical fluorescence technology. The effects of scavengers on the activity of photocatalytic degradation pollutants were studied. The results show that the concentration of sodium hydroxide has a great effect on UV and visible photoactivity of Bi0. 5 Na0. 5 TiO3 . When the concentration of sodium hydroxide is 8 mol·L-1 , photocatalytic activities of UV and visible light of Bi0. 5 Na0. 5 TiO3 are the highest,and photocatalytic degradation rates of methylene blue can reach respectively 69. 8%and 53. 4%with illumination time of 1h. The experiments of scavengers demonstrate that·OH and·O2-play an main role,and particularly·O2-play an important role in the photocatalytic degradation process of methylene blue.

关 键 词：水热法 Bi0.5Na0.5TiO3 清除剂 亚甲基蓝 光催化 

分 类 号：O634[理学—高分子化学]