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Synthesis and photocatalytic performances of BiVO4 by ammonia co-precipitation process |
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| Authors: | Jianqiang Yu Yan Zhang |
| Institution: | a Laboratory of Fiber Materials and Modern Textile, Institute of Multifunctional Materials, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China b School of Chemistry, Chemical Engineering and Environment, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China c Department of Applied Chemistry, Faculty of Science, Tokyo University of Sciences, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan d Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (CREST, JST), 4-1-8 Honcho, Kawaguchi-shi, Saitama 332-0012, Japan |
| Abstract: | This paper reports the preparation and photocatalytic performance of Bismuth vanadate (BiVO4) by a facile and inexpensive approach. An amorphous BiVO4 was first prepared by a co-precipitation process from aqueous solutions of Bi(NO3)3 and NH4VO3 using ammonia. Followed by heating treatment at various temperatures, the amorphous phase converted to crystalline BiVO4 with a structure between monoclinic and tetragonal scheelite. The crystallization of BiVO4 occurred at about 523 K, while the nanocrystalline BiVO4 were formed with a heat-treatment of lower than 673 K. However, when the heat-treatment was carried out at 773 K, the accumulation of nanocrystals to bulk particles was observed. The photocatalytic performances of the materials were investigated by O2 evolution under visible-light, and MB decomposition under solar simulator. The results demonstrated that the crystalline structure is still the vital factor for the activities of both reactions. However, the crystallinity of BiVO4 gives a major influence on the activity of O2 evolution, whereas the surface area, plays an important role for photocatalytic MB decomposition. |
| Keywords: | BiVO4 Visible-light photocatalysis Methylene blue decomposition O2 evolution |
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