4.6 Article

Co3O4-Ag photocatalysts for the efficient degradation of methyl orange

期刊

RSC ADVANCES
卷 10, 期 26, 页码 15245-15251

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra10437b

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资金

  1. School Foundation for North University of China [110246]
  2. Shanxi Science Foundation of China [201801D221197]
  3. Shanxi Scholarship Council of China [2017-094]
  4. Shanxi `1331 project' Key Subject Construction [1331KSC]

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In this paper, a series of Co3O4-Ag photocatalysts with different Ag loadings were synthesized by facile hydrothermal and in situ photoreduction methods and fully characterized by XRD, SEM, TEM, FTIR spectroscopy, XPS, UV-vis and PL techniques. The catalysts were used for the degradation of methyl orange (MO). Compared with the pure Co3O4 catalyst, the Co3O4-Ag catalysts showed better activity; among these, the Co3O4-Ag-0.3 catalyst demonstrated the most efficient activity with 96.4% degradation efficiency after 30 h UV light irradiation and high degradation efficiency of 99.1% after 6 h visible light irradiation. According to the corresponding dynamics study under UV light irradiation, the photocatalytic efficiency of Co3O4-Ag-0.3 was 2.72 times higher than that of Co3O4 under identical reaction conditions. The excellent photocatalytic activity of Co3O4-Ag can be attributed to the synergistic effect of strong absorption under UV and visible light, reduced photoelectron and hole recombination rate, and decreased band gap due to Ag doping. Additionally, a possible reaction mechanism over the Co3O4-Ag photocatalysts was proposed and explained.

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