Bi_(4)O_(5)Br_(2)光催化剂的制备及可见光降解卡马西平的活性研究  

Fabrication of Bi_(4)O_(5)Br_(2) and Its Photocatalytic Activity for Effective Degradation of Carbamazepine under Visible Light Irradiation

作　　者：毛晓明[1] 李敏[1] 刘晨 秦永燕 Mao Xiaoming;Li Min;Liu Chen;Qin Yongyan(Department of Chemistry,Changzhi University,Changzhi,046011)

机构地区：[1]长治学院化学系,长治046011

出　　处：《化学通报》2021年第7期715-719,共5页Chemistry

基　　金：山西省高等学校科技创新项目(2019L0906);长治学院科研项目(XJ2020000601);长治学院基础教育项目(2020J007)资助。

摘　　要：采用水解法合成了Bi_(4)O_(5)Br_(2)光催化剂,并通过XRD、SEM和DRS等手段对催化剂的结构、形貌和光吸收性质进行了表征。结果表明,催化剂呈不规则片状结构,其带隙能为2.1eV,价带电位EVB和导带电位ECB分别为2.61和0.51 eV。基于反应原理和表征结果,提出了催化剂形成机理。在可见光照射下,Bi_(4)O_(5)Br_(2)对卡马西平表现出高效的光催化氧化活性,光照120min后,卡马西平的降解率超过90%,反应动力学速率常数k达到0.018min^(-1)。捕获剂实验结果表明卡马西平降解过程中的主要活性物质是光生空穴(h^(+))和超氧自由基阴离子(·O^(-)_(2))。致畸作用实验结果表明,可见光照射120min后,卡马西平溶液基本上没有污染。此外,Bi_(4)O_(5)Br_(2)光催化剂在光催化降解卡马西平过程中表现出较高的化学稳定性和可重复性,表明其具有实际应用的潜力。Bi_(4)O_(5)Br_(2) photocatalyst was synthesized by a facile and energy-saving hydrolysis method.The structure,morphology and light absorption properties of the catalyst were characterized by XRD,SEM and DRS.The results showed that the catalyst had an irregular sheet structure,its bandgap energy was 2.1 eV,and the valence band potential and conduction band potential were 2.61 eV and 0.51 eV,respectively.Based on the reaction principle and characterization results,the catalyst formation mechanism was proposed.Under visible light irradiation,the Bi_(4)O_(5)Br_(2) exhibited superb photocatalytic oxidation activity for carbamazepine.After 120 min of light irradiation,the degradation rate of carbamazepine exceeded 90%,and the reaction kinetic rate constant,k,attained 0.018 min^(-1).The trapping agent experimental results showed that the main active species in the degradation process of carbamazepine were photogenerated holes(h^(+))and superoxide radical anion(·O^(-)_(2)).The results of teratogenicity experiments exhibited that the carbamazepine solution was basically free of pollution after 120 min of visible light irradiation.In addition,the Bi_(4)O_(5)Br_(2) photocatalyst maintained high chemical stability and repeatability in the process of photocatalytic degradation of carbamazepine,indicating its potential for practical applications.

关 键 词：Bi_(4)O_(5)Br_(2) 卡马西平 反应机理 致畸作用 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]