Journal
MOLECULES
Volume 25, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/molecules25204842
Keywords
bismuth vanadate; shape-tailoring; oxalic acid; rhodamine B; photodegradation
Funding
- Hungarian Science and Research Foundation [2017-2.3.7-TET-IN-2017-00016]
- Hungarian State and Research Foundation [2017-2.3.7-TET-IN-2017-00016, EFOP-3.6.2-16-2017-00010]
- GINOP programme [GINOP-2.3.2-15-2016-00013]
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- New National Excellence Program of the Ministry of Human Capacities [UNKP-18-4]
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In the present study, additive-free, pH-driven, hydrothermal crystallization was used to obtain shape-tailored monoclinic BiVO4 photocatalysts. The as-prepared BiVO4 products were systematically characterized, uncovering their crystallographic, morphologic and optical properties, while their applicability was verified in the visible light-driven photodegradation of oxalic acid and rhodamine B. Monoclinic clinobisvanite was obtained in most cases, with their band gap values located between 2.1 and 2.4 eV. The morphology varied from large, aggregated crystals, individual microcrystals to hierarchical microstructures. It was found that the degradation efficiency values obtained in the case of oxalic acid were directly related to the presence of (040) crystallographic plane, while the degradation of rhodamine B was partially independent by the presence of this structural feature. The importance of (040) crystallographic plane was also demonstrated via the reduction of Cu2+ to Cu, by analyzing the Raman spectra of the Cu containing samples, the mean primary crystallite size of Cu and Cu content. Furthermore, the presence of (040) crystallographic plane was directly proportional with the hydrodynamic properties of the powders as well.
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