摘要
为提高TiO_(2)的可见光光电催化活性,本文用Bi_(2)MoO_(6)和碳量子点(CQDs)对TiO_(2)纳米管阵列(TNA)进行了改性。以CQDs、Bi(NO_(3))_(3)·5H_(2)O和Na_(2)MoO_(4)为原料,通过简单的溶剂热法,在TNA中沉积了CQDs和Bi_(2)MoO_(6),成功制备了新型Bi_(2)MoO_(6)@CQDs/TNA。扫描电镜(SEM)和元素mapping分析结果表明,CQDs和Bi_(2)MoO_(6)成功涂覆在TNA管壁上。通过在可见光下降解甲基橙(MO)溶液,评价了所制备的光催化剂的光电催化性能。结果显示,经3 h的光电催化降解,Bi_(2)MoO_(6)@CQDs/TNA对MO的去除率比Bi_(2)MoO_(6)/TNA高32%。CQDs优异的上转换光致发光(UCPL)性能促进了TiO_(2)在可见光下被激发产生光生载流子,同时Bi_(2)MoO_(6)与TiO_(2)的耦合抑制了光生载流子的复合,从而提高了Bi_(2)MoO_(6)@CQDs/TNA的光电催化活性。
In this work,TiO_(2) nanotube arrays(TNA)were modified through the incorporation of Bi_(2)MoO_(6) and carbon quantum dots(CQDs),to improve the visible light photocatalytic activity of TiO_(2).The CQDs,Bi(NO_(3))_(3)·5H_(2)O,and Na_(2)MoO_(4) were used as the starting materials,a facile solvothermal method was employed to fabricate the novel Bi_(2)MoO_(6)@CQDs/TNA composite through the deposition of CQDs and Bi_(2)MoO_(6) into the TNA.Based on the SEM and elemental mapping results,CQD and Bi_(2)MoO_(6) are successfully coated on the tube wall of TNA.Moreover,the photocatalytic performance of Bi_(2)MoO_(6)@CQDs/TNA composite was investigated through the degradation of methyorange(MO)solution under the visible light irradiation.The corresponding photoelelctrocatalytic test results confirm that the as-prepared Bi_(2)MoO_(6)@CQDs/TNA exhibits an enhanced photoelectrocatalytic activity.Bi_(2)MoO_(6)@CQDs/TNA has a 32% higher removal rate of MO than Bi_(2)MoO_(6)/TNA.The enhanced activity can be attributed to the excellent up-conversion photoluminescence(UCPL)of CQDs,promoting TiO_(2) to generate photogenerated carriers under the visible light.Meanwhile,the heterojunction between Bi_(2)MoO_(6) and TiO_(2) can also effectively inhibit the recombination of photogenerated carriers.
作者
张大龙
何硕
林祖祥
戴高鹏
刘素芹
肖作安
蔡爽
ZHANG Dalong;HE Shuo;LIN Zuxiang;DAI Gaopeng;LIU Suqin;XIAO Zuoan;CAI Shuang(Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle,Hubei University of Arts and Science,Xiangyang 441053,China;School of Food Science and Technology&School of Chemical Engineering,Hubei University of Arts and Science,Xiangyang 441053,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第12期4137-4143,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51572076)
“机电汽车”湖北省优势特色学科群开放基金(XKQ2021029)。
