Journal
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
Volume 40, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colcom.2020.100341
Keywords
Oxide; Nanocomposite, adsorption; Surface area; Surface charge; Charge separation; Photoluminescence; Photocatalysis
Funding
- program of Scientists of Next Generation-2015 (SNG-5) by the Academy of Scientific Research and Technology (ASRT), Ministry of Scientific Research, Egypt
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Co3O4, NiO, and CuO nanocomposites as photocatalysts under visible light for degradation of Congo Red dye were studied. Adsorption capacity inversely correlated with zeta potential, and band gap variation did not affect visible-light PCA.
Single and mixed phases of Co3O4, NiO, and CuO nanocomposites were synthesized and investigated as photocatalysts under visible light for degradation of Congo Red dye. Selected parameters were monitored regarding their impacts on photocatalysis, including band gap, crystallite size, specific surface area, zeta potential, composition, and adsorption parameters such as adsorption capacity, equilibrium constant, rate, and thermodynamic quantities. The dominant adsorption mode was chemisorption. Adsorption capacity varied inversely with zeta potential due to repulsion between dye molecule and nanocomposites surface. As the metal content was varied, photocatalytic activity (PCA) depended strongly on type/number of oxides, on charge carrier separation, and adsorption capacity. Specific surface area was less influential to PCA. PCA had little or no dependence on crystallite size, surface charge, adsorption kinetics, equilibrium constant, and thermodynamic parameters. Variation of the band gap did not affect visible-light PCA since all nanocomposites (except NiO) exhibited band gaps in the near infrared.
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