Journal
OPTICAL MATERIALS
Volume 114, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2020.110761
Keywords
BiVO4; TiO2 nanoparticles; Sol-gel; Photodegradation of RhB dye; Z-scheme; Hydrogen evolution
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Funding
- Scientific Research Deanship at University of Ha'il-Saudi Arabia [RG-20 068]
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Sonicated mesoporous BiVO4/TiO2 heterojunctions show high efficiency in photodegradation of dyes and production of hydrogen gas. The optimum concentration of BiVO4 is 10 wt%, generating hydrogen gas at a rate of 14.3 mmolg-1h-1. Ultrasound radiation plays a key role in reducing particle aggregates and increasing the concentration of active sites.
Sonicated mesoporous BiVO4/TiO2 heterojunctions were recorded for highly efficient photodegradation of rhodamine B dye and production of hydrogen gas. The heterojunction structures were characterized by XRD, DRS, FTIR, BET, FESEM, HRTEM and PL. The efficiency of the radiation power of ultrasound waves [50-300 Watt/cm2] on dye degradation and efficiency of hydrogen production was established. BiVO4 shifts the photocatalytic response of titania toward visible region. The photocatalytic efficiency of RhB removal on the nanocomposites surface containing 10 wt% BiVO4 is 0.021 min-1 tenfold higher than that of bare TiO2 (0.0023 min-1). The optimum concentration of BiVO4 was found to be 10 wt% that generate hydrogen gas with rate equal to 14.3 mmolg- 1h- 1. Ultrasound radiation is a prime key in reducing the population of particle aggregates and reflects a strong interaction between BiVO4 and TiO2 nanoparticles that results in lowering the electron-hole pairs recombination rate and increase the concentration of active sites and amount hydrogen evolved. The production of hydroxyl and superoxide radicals suggest a direct Z-scheme mechanism for explaining the high photocatalytic reactivity of sample.
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