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Visible-light-driven copper acetylacetonate decomposition by BiVO4.

Shin-ichi Naya1, Masanori Tanaka, Keisuke Kimura

  • 1Environmental Research Laboratory, School of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 9, 2011
PubMed
Summary

Monoclinic bismuth vanadate (m-BiVO4) efficiently decomposes copper acetylacetonate under visible light, achieving high photocatalytic activity for copper recovery. This method surpasses traditional titanium dioxide photocatalysis.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Catalysis

Background:

  • Visible-light photocatalysis offers a sustainable route for chemical transformations.
  • Bismuth vanadate (BiVO4) is a promising semiconductor photocatalyst.
  • Copper recovery from solutions is crucial for resource management.

Purpose of the Study:

  • To investigate the photocatalytic decomposition of copper acetylacetonate using monoclinic bismuth vanadate (m-BiVO4) under visible light.
  • To evaluate the efficiency of m-BiVO4 for copper recovery.
  • To elucidate the reaction mechanism and factors contributing to high photocatalytic activity.

Main Methods:

  • Visible-light irradiation of m-BiVO4 in a copper acetylacetonate solution.
  • Photonic efficiency measurements at specific wavelengths.
  • Adsorption isotherm studies.
  • Light intensity-dependence experiments.
  • Electrochemical measurements (cyclic voltammetry).

Main Results:

  • m-BiVO4 demonstrated efficient decomposition of copper acetylacetonate and recovery of copper.
  • Photonic efficiency reached 3.4% at 440 ± 15 nm, outperforming TiO2 (2.0% at 355 ± 23 nm).
  • High adsorptivity of m-BiVO4 for the reactant or sufficient reactant supply to surface sites contributed to activity.
  • Electrochemical studies indicated oxidative ligand degradation followed by Cu(2+) reduction.
  • Cu(2+) ions mediated electron transfer from m-BiVO4 to O2 under aerobic conditions, completing the catalytic cycle.

Conclusions:

  • m-BiVO4 is a highly effective visible-light photocatalyst for copper recovery.
  • The photocatalytic process involves ligand degradation and copper ion reduction, facilitated by Cu(2+) mediation.
  • The study highlights the potential of m-BiVO4 in sustainable resource recovery and photocatalysis.