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.
出处
《化学研究与应用》
CAS
CSCD
北大核心
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)
