Department of Chemistry
Porous peanut-like Bi2O3–BiVO4 composites with heterojunctions: One-step synthesis and their photocatalytic properties
For the first time, porous peanut-like Bi 2O 3- BiVO 4 composites with heterojunctions have been synthesized by a one-step mixed solvothermal method with the assistance of a l-lysine template. A mixture of ethylene glycol (EG) and H 2O (volume ratio of EG-H 2O = 3:1) is used as the solvent. Unlike the traditional methods, no concentrated HNO 3 and/or NaOH are involved in diluting Bi and V sources in the adopted approach. The as-synthesized peanut-like samples are rough and porous on the surface and to some extent are interior-hollow. The degradation of methylene blue (MB) is employed to evaluate the photocatalytic activity of the Bi 2O 3-BiVO 4 composite. It is observed that the composite performs much better than Bi 2O 3 and BiVO 4, plausibly due to heterojunctions formed between Bi 2O 3 and BiVO 4. To investigate the relationship between structure and performance, the as-synthesized samples are characterized by XRD, XPS, SEM, TEM (HRTEM), UV-vis DRS, PL and nitrogen adsorption-desorption methods. Additionally, a possible growth mechanism of this hollow peanut-like structure and the separation process of photogenerated electron-hole pairs on the heterojunctions have been discussed. © 2012 The Royal Society of Chemistry.
Source Publication Title
Royal Society of Chemistry
Chen, Lang, Qiang Zhang, Rui Huang, Shuang-Feng Yin, Sheng-Lian Luo, and Chak-Tong Au. "Porous peanut-like Bi2O3–BiVO4 composites with heterojunctions: One-step synthesis and their photocatalytic properties." Dalton Transactions 41.31 (2012): 9513-9518.