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<p>Photocatalysis is a promising method for the total elimination of emerging contaminants in water. The photocatalyst material is responsible for the oxidation–reduction reaction for the degradation of the pollutants in the water. This work is focused on the development of BiVO<sub>4</sub> by in situ sonochemical method, to be used as the photocatalyst in the decomposition of emerging pollutants, especially pharmaceuticals. The nanopowder was synthesized using in situ sonochemical method, varying the power during preparation, to evaluate the photocatalytic properties in the degradation of 2 broad-spectrum antibiotics widely used by society: Tetracycline (TC) and Levofloxacin (LVX). The formation of BiVO<sub>4</sub> was confirmed by X-ray diffraction using the JCPDS reference card 01-075-1867. The morphology of the samples was analyzed by SEM, obtaining an irregular morphology. The particle size ranged from 100 to 700&#xa0;nm, and the energy band gap by DRS was around 2.3–2.4&#xa0;eV. This is consistent with what has been reported in the literature. The sample that presented the best photocatalytic performance was obtained at 170&#xa0;W of power due to its particle size and surface area. As a follow-up to the photocatalytic tests, the total organic carbon (TOC) was determined, obtaining a mineralization of ~ 47% for TC and ~ 16% for LVX. Scavengers were added to evaluate the species that govern the degradation of contaminants. In the case of TC degradation, the H<sub>2</sub>O<sub>2</sub> had the most substantial effect on degradation kinetics, while for LVX, the holes (h<sup>+</sup>) had the most potent effect.</p>

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Facile preparation in situ of BiVO4 via ultrasound for evaluation of its photocatalytic properties

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Diana B. Hernandez-Uresti,
  • D. Sánchez-Martínez,
  • E. Luevano-Hipolito,
  • S. Obregón

摘要

Photocatalysis is a promising method for the total elimination of emerging contaminants in water. The photocatalyst material is responsible for the oxidation–reduction reaction for the degradation of the pollutants in the water. This work is focused on the development of BiVO4 by in situ sonochemical method, to be used as the photocatalyst in the decomposition of emerging pollutants, especially pharmaceuticals. The nanopowder was synthesized using in situ sonochemical method, varying the power during preparation, to evaluate the photocatalytic properties in the degradation of 2 broad-spectrum antibiotics widely used by society: Tetracycline (TC) and Levofloxacin (LVX). The formation of BiVO4 was confirmed by X-ray diffraction using the JCPDS reference card 01-075-1867. The morphology of the samples was analyzed by SEM, obtaining an irregular morphology. The particle size ranged from 100 to 700 nm, and the energy band gap by DRS was around 2.3–2.4 eV. This is consistent with what has been reported in the literature. The sample that presented the best photocatalytic performance was obtained at 170 W of power due to its particle size and surface area. As a follow-up to the photocatalytic tests, the total organic carbon (TOC) was determined, obtaining a mineralization of ~ 47% for TC and ~ 16% for LVX. Scavengers were added to evaluate the species that govern the degradation of contaminants. In the case of TC degradation, the H2O2 had the most substantial effect on degradation kinetics, while for LVX, the holes (h+) had the most potent effect.