Sb掺杂Li_(2)SnO_(3)增加氧化电势提升2,4-DCP光催化降解的研究  

Sb-doped Li_(2)SnO_(3)increases oxidation potential to enhance photocatalytic degradation of 2,4-DCP

作　　者：洪传冰 赖寒 代朋 姜文 陈姚宇 王熙 李雷 张涛 HONG Chuan-bing;LAI Han;DAI Peng;JANG Wen;CHEN Yao-yu;WANG Xi;LI Lei;ZHANG Tao(College of Biological and Chemical Engineering,Chongqing University of Education,Chongqing 400067,China)

机构地区：[1]重庆第二师范学院生物与化学工程学院,重庆400067

出　　处：《化学研究与应用》2024年第4期816-823,共8页Chemical Research and Application

基　　金：重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1158)资助;重庆市教育委员会科学技术研究项目(KJZD-K202301605)资助;重庆第二师范学院大学生科研项目(KY20230041)资助;重庆第二师范学院大学生创业孵化项目(ZC202215)资助;重庆第二师范学院大学生创新创业训练项目(S202314388016)资助。

摘　　要：本文通过固相法制备Sb掺杂Li_(2)SnO_(3)光催化剂并将其用于光催化降解2,4-DCP。通过粉末X射线多晶衍射技术(PXRD)、高分辨透射电镜(TEM)及扫描电镜(SEM)对合成的光催化剂分别进行了物相结构和表面形貌表征。光催化实验表明,Sb掺杂之后的样品具有较为优越的光催化性能,其在紫外光下12 min内,其降解率可达100%。然而母体Li_(2)SnO_(3)在同样的条件下,12 min内光催化降解率仅有58.20%。紫外漫反射吸收光谱表明,Sb掺杂之后,光学吸收带宽增加;时间分辨光谱测试表明,Sb掺杂后样品的光生载流子寿命下降。综合以上分析,光催化效率提升的原因,来自于其价带氧化电势的增强。自由基捕获实验表明,空穴(h+)和超氧阴离子自由基(O_(2)·-)是2,4-DCP降解过程中的主要活性自由基。本文的研究为半导体掺杂对光催化效率的提升提供重要的指导。In this paper,Sb-doped Li_(2)SnO_(3)photocatalyst was prepared by solid phase method and used for photocatalytic degradation of 2,4-DCP.The phase structure and surface morphology of the synthesized photocatalyst were characterized by powder X-ray polycrystalline diffraction(PXRD),high-resolution transmission electron microscopy(TEM)and scanning electron microscopy(SEM).The photocatalytic experiments show that the sample doped with Sb has superior photocatalytic performance,and its degradation rate can reach 100%within 12 min under UV light.However,the photocatalytic degradation rate of Li,SnO,was only 69.40%within 12 min under the same conditions.The UV diffuse reflection spectra show that the optical absorption bandwidth increases after Sb doping.The time-resolved spectral test shows that the photogenerated carrier lifetime of Sb doped sample decreases.According to the above analysis,the reason for the improvement of photocatalytic efficiency comes from the enhancement of its valence band oxidation potential.The experiment of free radical capture showed that hole(h^(+))and superoxide anion radical(O_(2)·-)were the main active free radicals in the degradation of 2,4-DCP.The research in this paper provides important guidance for the improvement of photocatalyt-ic efficiency by semiconductor doping.

关 键 词：无机非金属材料 半导体掺杂 Li_(2)SnO_(3) 光催化 2 4-DCP 

分 类 号：O614.5[理学—无机化学]