双酚A敏化Bi_(5)O_(7)I纳米片增强可见光自降解活性  

Bisphenol A⁃sensitized Bi_(5)O_(7)I nanosheets with enhanced visible⁃light⁃driven degradation activity

作　　者：马冉 姜铮 张塞 文涛 王祥科[1] MA Ran;JIANG Zheng;ZHANG Sai;WEN Tao;WANG Xiang-Ke(MOE Key Laboratory of Resources and Environmental Systems Optimization,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学环境科学与工程学院,资源环境系统优化教育部重点实验室,北京102206

出　　处：《无机化学学报》2023年第3期406-414,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家重点研发计划(No.2018YFC1900105);国家自然科学基金(No.22106047);科学挑战项目(No.TZ2016004);北京市杰出青年科学基金项目资助。

摘　　要：以BiOIO_(3)为前驱体,通过高温煅烧法制备了一系列铋(Bi)基材料,并系统地研究了不同样品的物相组成、微观形貌、光学性能及光催化活性。实验结果表明,Bi_(5)O_(7)I纳米片在可见光(λ>420 nm)照射60 min后,对双酚A(BPA)的降解率可达99.3%,5次循环使用后仍能去除97%的BPA,表现出良好的光催化活性与稳定性。研究表明,BPA可以作为表面配体,与Bi_(5)O_(7)I发生表面配位,通过配体-金属电荷转移(LMCT)的光敏化机制作用实现太阳光的高效利用并促进其自降解。In this work,various Bi-based photocatalysts were prepared via a facile calcination process by using BiOIO_(3) as precursor.The microstructure,phase composition,and optical properties of these samples have been systematically studied by a series of characterization techniques.The photoactivities of these as-prepared samples were evaluated by the photodegradation of endocrine disruptor bisphenol A(BPA)under visible light(λ>420 nm)irradiation.The results showed that after calcination at 450℃in air,BiOIO_(3) was completely changed into Bi_(5)O_(7)I nanosheets,and the degradation efficiency for BPA could reach 99.3%within 60 min.Meanwhile,after 5 photodegradation cycles,the degradation rate of BPA by Bi_(5)O_(7)I could still reach 97%,exhibiting remarkable reusability.However,Bi_(5)O_(7)I exhibited a wide band gap and could only absorb a small part of visible light.The surface interaction between BPA and Bi_(5)O_(7)I might be responsible for its visible light reactivity.To investigate the photocatalytic mechanism,UV-Vis diffuse reflectance spectra(UV-Vis DRS),X-ray photoelectron spectroscopy(XPS),and electrochemical experiments were performed on Bi_(5)O_(7)I before and after BPA adsorption.UV-Vis DRS showed that Bi_(5)O_(7)I displayed enhanced absorption in the visible light region after modified by BPA.The intensive visible light harvesting property of Bi_(5)O_(7)I might be caused by ligand-to-metal charge transfer(LMCT)mechanism.XPS results confirmed the existence of a strong interaction between BPA and Bi_(5)O_(7)I,which might ascribe to surface complexation of BPA on Bi_(5)O_(7)I.Besides,the modification of Bi_(5)O_(7)I by BPA facilitated the migration and separation of photo-generated electron(e-)and hole(h+).Quenching experiments revealed that superoxide radical(·O_(2)-),h+and hydroxyl radical(·OH)were all participated in the photocatalytic reaction system.Combined with characterizations and experimental data,the mechanism of enhanced photodegradation performance through LMCT photosensitization mechanism b

关 键 词：Bi_(5)O_(7)I 双酚A 可见光催化 配体-金属电荷转移 

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