La掺杂Bi_(2)O_(3)的制备及其可见光催化降解4-氯酚的研究  

Study of Preparation of La Doped Bi_(2)O_(3) Photocatalyst and Photocatalytic Degradation of 4-ChlorophenolUnder Visible Light Irradiation

作　　者：林世静[1] 王杰[1] 刘策 郭威 张建国 张春颖 LIN Shijing;WANG Jie;LIU Ce;GUO Wei;ZHANG Jianguo;ZHANG Chunying(College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)

机构地区：[1]北京石油化工学院新材料与化学工程学院,北京102617

出　　处：《北京石油化工学院学报》2021年第3期1-6,21,共7页Journal of Beijing Institute of Petrochemical Technology

基　　金：北京市大学生研究训练计划项目(2019J00008);北京石油化工学院校级教育教学改革与研究项目(YB20200101)。

摘　　要：采用醇介导法制备了La离子掺杂改性的氧化铋,并通过SEM、IR、PL、BET、XRD等对其结构和性能进行表征。结果表明:La离子掺杂导致氧化铋的禁带宽度由2.984 eV降低为2.940 eV,加大了氧化铋的光吸收范围并降低了光生电子-空穴的复合几率。掺杂La提高了Bi_(2)O_(3)的可见光催化活性,在25℃可见光下4-氯苯酚光照8h的降解率可达92.24%。此外,控制实验表明空穴是La-Bi_(2)O_(3)可见光催化降解4-氯苯酚的主要活性物种。In this paper,La doped bismuth oxide micro/nano materials were prepared by the ethylene-glycol-mediated process.The structures and properties of the prepared materials were characterized by means of SEM,IR,PL,BET and XRD.After modification,it is found out that the band gap is reduced from 2.984 eV to 2.940 eV,the light absorption range of bismuth oxide is increased,and the recombination of photogenerated electrons and holes is decreased.The results show that La doping improves the photocatalytic activity of Bi_(2)O_(3),under visible light 8h at 25℃,and the degradation efficiency of 4-chlorophenol was up to 92.24%.In addition,the experiments also show that the photogenerated holes are the main active species in this degradation system.

关 键 词：Bi_(2)O_(3) La离子掺杂 微/纳米材料 可见光催化 4-氯苯酚 

分 类 号：O611.4[理学—无机化学] O644[理学—化学]