| 双酚A敏化Bi5O7I纳米片增强可见光自降解活性 |
| Bisphenol A-sensitized Bi5O7I nanosheets with enhanced visible-light-driven degradation activity |
| 作者 | 单位 | E-mail | | 马冉 | 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 | | | 姜铮 | 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 | | | 张塞 | 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 | | | 文涛 | 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 | twen@ncepu.edu.cn | | 王祥科 | 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 | |
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| 摘要: 以BiOIO3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，Bi5O7I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Bi5O7I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。 |
| 关键词: Bi5O7I 双酚A 可见光催化 配体-金属电荷转移 |
| 基金项目: 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)和北京市杰出青年科学基金项目资助。 |
| Abstract: 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, BiOIO3 was completely changed into Bi5O7I 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 Bi5O7I could still reach 97%, exhibiting remarkable reusability. However, Bi5O7I exhibited a wide band gap and could only absorb a small part of visible light. The surface interaction between BPA and Bi5O7I 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 Bi5O7I before and after BPA adsorption. UV-Vis DRS showed that Bi5O7I displayed enhanced absorption in the visible light region after modified by BPA. The intensive visible light harvesting property of Bi5O7I might be caused by ligand-to-metal charge transfer (LMCT) mechanism. XPS results confirmed the existence of a strong interaction between BPA and Bi5O7I, which might ascribe to surface complexation of BPA on Bi5O7I. Besides, the modification of Bi5O7I by BPA facilitated the migration and separation of photo-generated electron (e-) and hole (h+). Quenching experiments revealed that superoxide radical (·O2-), 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 mechanismbetween Bi5O7I and BPA was proposed. |
| Keywords: Bi5O7I bisphenol A visible light photocatalysis ligand-to-metal charge transfer |
| 投稿时间：2022-07-18 修订日期：2023-01-09 |
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