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.
Scopus Subject Areas
- Inorganic Chemistry