One-pot solvothermal preparation of S-doped BiOBr microspheres for efficient visible-light induced photocatalysis
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One-pot solvothermal preparation of S-doped BiOBr microspheres for efficient visible-light induced photocatalysis Xia Li, Guohua Jiang*, Zhen Wei, Xiaohong Wang, and Wenxing Chen, Key Laboratory of Advanced Textile Materials and Manufacturing Technology (ATMT), Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China; Department of Materials Engineering, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China Liang Shen, College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China *Address all correspondence to Guohua Jiang at [email protected] (Received 8 June 2013; accepted 4 September 2013)
Abstract The S-doped BiOBr composite microspheres were successfully prepared through one-pot solvothermal method. The as-prepared samples exhibit higher photocatalytic activity for the degradation of Rhodamine B and phenol under visible light irradiation, attributed to the improvement of the photo-absorption property and the narrow band gap due to the dopants of S element. The higher efficiency for photodegradation of organic pollutant endows this material with a bright perspective in purification of waste water under visible-light irradiation.
Owing to industrialization and urbanization, the environmental pollution caused by hazardous wastes and toxic air contaminants has become an overwhelming problem. In order to address this issue, various technologies have been developed, including incineration,[1] adsorption,[2] and electrical discharge.[3] Among these methods, photocatalysis has received considerable attention due to its high oxidizing capacity, photostability, and nontoxicity.[4–9] Since the discovery of water electrolysis, titanium dioxide (TiO2) has been widely used as a photocatalyst for degradation of organic contaminants.[10–13] However, it requires high energy ultraviolet (UV) light to activate due to its large band gap, resulting in low-efficiency in utilization of visible light irradiation.[14–16] As a result, many efforts have been devoted to explore the visible-light-induced photocatalysts. Bismuth oxyhalides compounds have recently attracted intensive interest in solar energy conversion due to their high photocatalytic activity and stability under UV and visible light irradiation,[17–19] Among bismuth oxyhalides, BiOBr which crystallizes possess the tetragonal matlockite structure, a layered structure composed of [Bi2O2]2+ layers interleaved with double Br layers.[20,21] It has received remarkable attention owing to its stability, suitable band gap, and relatively superior photocatalytic ability.[22,23] So far, a variety of BiOBr nano- and micro-structures, including nanoplates, nanobelts, and microspheres prepared by numerous methods, have been used as photocatalysts to degrade organic contaminants.[24,25] However, the photodegradation ability of BiOBr still cannot meet the demand of practical applications. To date, continuous attempts have been conducted to improve the photocatalyti
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