Surface modification of BiOBr/TiO2 by reduced AgBr for solar-driven PAHs degradation: Mechanism insight and application assessment.
Surface modification of BiOBr/TiO2 by reduced AgBr for solar-driven PAHs degradation: Mechanism insight and application assessment.
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DOI：
10.1016/j.jhazmat.2021.125221
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发表时间：
2021-01
影响因子：
13.6
通讯作者：
Xian-bo Sun;Wei-kai He;X. Hao;Haodong Ji;Wen Liu;Zhengqing Cai
中科院分区：
文献类型：
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作者：
Xian-bo Sun;Wei-kai He;X. Hao;Haodong Ji;Wen Liu;Zhengqing Cai
通过简单的共沉淀法合成了一种新型太阳能活性AgBr/BiOBr/TiO 2 催化剂，用于太阳能驱动的水体修复。合成材料由负载在BiOBr纳米片上的花状TiO 2 纳米颗粒和均匀表面分布的Ag/AgBr纳米颗粒组成。 BiOBr/TiO 2 异质结之间的内电场极大地促进了载流子的迁移；窄带隙半导体（AgBr和BiOBr）的引入促进了可见光吸收； Ag/AgBr纳米粒子作为光敏剂进一步提高光利用率。新材料在太阳光下的活性分别是纯TiO 2 和BiOBr的7.6倍和4.0倍，并且活性物质对蒽降解的贡献遵循h+> O 2•−>• OH的顺序。基于中间体分析和DFT计算提出了降解机制和途径。 QSAR分析表明，光催化过程中污染物的环境风险大大降低，但一些中间体仍然有毒。高光催化活性、稳定性和适应性都表明该新材料在太阳光下持久性有机污染物的经济高效光催化修复方面具有巨大的应用潜力。
A novel solar active AgBr/BiOBr/TiO 2 catalyst was synthesized by a facile coprecipitation method for solar-driven water remediation. The synthesized material composed of flower-like TiO 2 nanoparticles loaded on BiOBr nanosheets and with homogeneous surface distributed Ag/AgBr nanoparticles. The internal electric field between BiOBr/TiO 2 heterojunction greatly facilitated the charge carrier migration; the introduction of narrow band gap semiconductors (AgBr and BiOBr) promoted the visible light adsorption; and the Ag/AgBr nanoparticles acted as photosensitizer to further improve the light utilization. The new material showed 7.6-and 4.0-times activity of pure TiO 2 and BiOBr under solar light, and the contribution of reactive species on anthracene degradation followed the order of h+> O 2•−>• OH. The degradation mechanism and pathway were proposed based on intermediates analysis and DFT calculation. The QSAR analysis revealed that the environmental risks of contaminants were greatly reduced during the photocatalysis process but some intermediates were still toxic. The high photocatalytic activity, stability and adaptability all indicated that this new material owns great application potential for cost-effective photocatalytic remediation of persistent organic contaminants under solar light.