4.7 Article

Piezo-photocatalytic activity of Bi2VO5.5 for methylene blue dye degradation

Journal

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 21, Issue -, Pages 1998-2012

Publisher

ELSEVIER
DOI: 10.1016/j.jmrt.2022.09.130

Keywords

Bi2VO5.5; Photocatalysis; Piezocatalysis; Piezo-photocatalysis; Germination index

Funding

  1. Princess Nourah bint Abdulrahman University Researchers Supporting Project [PNURSP2022R124]
  2. Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
  3. Deanship of Scientific Research at King Khalid University, Saudi Arabia [L.R.G.P2/173/43]
  4. Korea Institute of Energy Technology Evaluation and Planning (KETEP)
  5. Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [2018201010636A, 20204010600090]

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This study investigates the combined effect of piezocatalytic and photocatalytic activity to achieve improved piezo-photocatalytic dye degradation efficiency under visible light. The results demonstrate that the Bi2VO5.5 powder sample exhibits high photocatalytic efficiency and good reusability.
This study comprises the combined effect of piezocatalytic and photocatalytic activity to obtain improved piezo-photocatalytic dye degradation efficiency in visible light. Single-phase Bi2VO5.5 powder was prepared through solid-state synthesis at 750 degrees C in 8 h. Time-dependent photo-current responses were conducted to understand the phenomenon of charge carrier transport in visible light. Bi2VO5.5 powder sample demonstrated high photocatalytic efficiency and good reusability possessing a bandgap value of 2.13 eV. Bi2VO5.5 powder sample attained 70% and % degradation efficiency during photocatalysis and piezocatalysis respectively. The piezo-photocatalytic methylene blue dye attained similar to 82% degradation efficiency in 240 min duration of visible light illumination. The scavenger test depicted holes (h(+)) as the principal active species in the piezo-photocatalytic dye degradation. There incurred no severe loss in photocatalytic efficiency even after 4 cycles which proclaims the reusability of the Bi2VO5.5 powder sample. A study on the kinetic rate constant with varying dye concentrations was conducted. With varied dye concentration of 5, 10, 15 mg/L, the kinetic rate constant obtained was 0.00528, 0.0030, and 0.00125 min(-1), respectively. Germination index was found through a phytotoxicity test using vigna radiata seeds. Here visible light along with mechanical energy has been used to achieve higher MB dye degradation efficiency through piezo-photocatalysis. (C) 2022 The Author(s). Published by Elsevier B.V.

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