具有可控表面缺陷的氧卤化铋半导体在光催化降解空气中甲苯中的实际可行性。

IF 9.4 1区 化学 Q1 CHEMISTRY, PHYSICAL
Jinjian Zhang , Kumar Vikrant , Changho Yeon , Chan-Woo Lee , Ki-Hyun Kim
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引用次数: 0

摘要

采用溶剂热诱导还原工艺合成表面缺陷(BiOX-R (R =还原))的二维半导体(氧化卤化铋(BiOX (X = Cl和Br)),研究了甲苯(模型芳香族挥发性有机化合物(VOC))的光催化降解(PCD)。在紫外光照射下,BiOCl-R对5 ppm甲苯(20%相对湿度)的PCD效率为98.6%,量子产率为1.04E-03分子光子-1,洁净空气输送率为3 L/h。对催化剂性能、实验数据和密度泛函理论模拟的综合评价一致表明,表面缺陷的形成应促进甲苯、分子氧(O2)和水(H2O)分子的吸附和活化。同时,缺陷BiOX的几何结构和电子结构有利于通过电子(e-)辅助O2活化和空穴(h+)介导的H2O氧化分别生成超氧阴离子(O2-)和羟基(OH)自由基。值得注意的是,在苯甲醛和苯甲酸等中间产物的开环过程中,BiOCl-R表面更有利于降低反应能垒。总的来说,本研究的结果为设计具有可控表面缺陷的先进光催化剂以高效PCD去除空气中芳香族挥发性有机化合物提供了实用指南。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The practical feasibility of bismuth oxyhalide semiconductors with controlled surface defects in photocatalytic degradation of toluene in air

The practical feasibility of bismuth oxyhalide semiconductors with controlled surface defects in photocatalytic degradation of toluene in air
The photocatalytic degradation (PCD) of toluene (as model aromatic volatile organic compound (VOC)) is studied using two-dimensional semiconductors (bismuth oxyhalides (BiOX (X = Cl and Br)) synthesized with surface defects (BiOX-R (R = reduction)) through a solvothermal-induced reduction process. The PCD efficiency of BiOCl-R against 5 ppm toluene (20 % relative humidity (RH)) is 98.6 % under ultraviolet light irradiation with the quantum yield and clean air delivery rate of 1.04E-03 molecules photon-1 and 3 L/h, respectively. A combined evaluation of catalyst properties, experimental data, and density functional theory simulations consistently indicates that the formation of surface defects should promote the adsorption and activation of toluene, molecular oxygen (O2), and water (H2O) molecules. Meanwhile, the geometric and electronic structure of defective BiOX favorably generates superoxide anion (O2) and hydroxyl (OH) radicals through electron (e-)-assisted O2 activation and hole (h+)-mediated H2O oxidation, respectively. Notably, the BiOCl-R surface becomes more advantageous to reduce the reaction energy barrier in the ring-opening processes of intermediate forms like benzaldehyde and benzoic acid. Overall, the results of this study offer practical guidelines for the design of advanced photocatalysts with controlled surface defects for the efficient PCD of aromatic VOCs in air.
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来源期刊
CiteScore
16.10
自引率
7.10%
发文量
2568
审稿时长
2 months
期刊介绍: The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies
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