一锅法合成缺陷型Bi/BiOBr纳米复合材料及其可见光驱动去除水体六价铬离子和有机染料的研究

doi:10.11896/cldb.20080207

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Abstract Bi/BiOBr nanocomposites with tunable Bi content and oxygen vacancies were prepared via a facile one-pot solvothermal method by adjusting the relative molar ratio of Bi precursor and bromide salt. Detailed characterizations showed that Bi nanoparticles and oxygen-vacancies on the {110}-plane of BiOBr were fabricated simultaneously in this process and ethylene glycol(EG) used as solvent afforded reduction of Bi³⁺ to metallic Bi and coinstantaneous conformation of oxygen vacancy. The photocatalytic performance showed that the Bi/BiOBr nanocomposites exhibited superior photocatalytic activity to their counterparts in degrading aqueous Cr(Ⅵ) and methylene blue(MB), and the removal efficiency of Bi/BiOBr was highly dependent on the content of Bi and oxygen vacancy. Among all as-prepared samples, the sample with a Bi loading of 5.0% exhibited the highest photocatalytic activity with Cr(Ⅵ) and MB removal rates up to 97.3% and 90.5% within 4 h's visible light irradiation, respectively. The mechanism study demonstrated that the remarkable visible light driven photo-activity of Bi/BiOBr nanocomposites were described to the synergy of the surface plasmon resonance (SPR) effect of metallic Bi and oxygen vacancies, which contributed to enhance the visible light harvesting and the separation efficiency of photo-generated electron-hole pairs. The present work provided a new method to the design of heterostructure materials with controllable Bi content and concomitant formation of oxygen vacancies.

Key words： Bi/BiOBr oxygen vacancy surface plasmon resonance photocatalytic visible light

Published: 25 December 2021 Online: 2021-12-27

CLC number:

X703

Fund:This work was financially supported by the National Natural Science Foundation of China (51402030).

About author: Wen Jiais a graduate student of the School of Materials Science and Engineering, Chongqing Jiaotong University. Since enrolling in 2018, she had published 2 papers in academic journals as the first author. She is applying for 1 national invention patent. At the same time, she had participated in national, provincial and ministerial projects hosted by her supervisor. Her research work mainly focuses on the application of functional compo-site materials/nanomaterial in environmental protection and energy (catalytic materials, lithium batteries, supercapacitors, etc.), and the fundamental theory & application about graphene derivatives in diffe-rent fields.Xiaoya Yuan, professor of Chongqing Jiaotong University, postgraduate tutor, young and middle-aged backbone teacher of Chongqing University, senior visiting scholar of Rensselaer Polytechnic Institute in the United States, A-type young top talent of Chongqing Jiaotong University. Main research directions:(1) application of functional composite materials/nano materials in environmental protection and energy (catalytic materials, lithium batteries, super capacitors, etc.); (2) cement concrete, concrete admixtures, functional building materials, etc.; (3) high application of molecular materials, chemical materials and other materials in civil engineering, transportation and other fields; (4) several theories and application development of new functional materials used in civil engineering materials; (5) modified asphalt and asphalt mixtures. Served as a reviewer for several internationally renowned journals; expert of the National Natural Science Foundation of China, the Chongqing Science and Technology Commission, the National Graphene Industry Technology Alliance, the Chongqing Graphene Standards Committee and the Graphene Alliance. Edited 1 textbook and participated in the editing of 1 textbook; in the past five years, he has presided over more than 10 national, provincial and ministerial projects; published more than 60 academic papers in high-level magazines at home and abroad, of which more than 40 articles were indexed by SCI/EI. Obtained 10 national invention patents and 1 utility model patent.

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Cite this article:

JIA Wen,YUAN Xiaoya,FENG Zijuan, et al. Facile One-pot Synthesis of Bi-decorated Defective BiOBr Composites with Remarkable Visible Light Driven Activity Towards Reduction of Aqueous Cr(Ⅵ) and Degradation of Organic Dye[J]. Materials Reports, 2021, 35(24): 24032-24040.

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http://www.mater-rep.com/EN/10.11896/cldb.20080207 OR http://www.mater-rep.com/EN/Y2021/V35/I24/24032

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