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Title: Excellent performance of ordered Ag-g-C3N4/SBA-15 for photocatalytic ozonation of oxalic acid under simulated solar light irradiation
Authors: Ling, Y
Liao, G
Feng, W
Liu, Y 
Li, L
Keywords: Ag nanoparticle
Photocatalytic ozonation
Issue Date: 2017
Publisher: Elsevier
Source: Journal of photochemistry and photobiology. A, Chemistry, 2017, v. 349, p. 108-114 How to cite?
Journal: Journal of photochemistry and photobiology. A, Chemistry 
Abstract: Ordered Ag-g-C3N4/SBA-15 was successfully synthesized using SBA-15 as a template and support. The samples were characterized by TEM, XRD, XPS, N2 adsorption-desorption. The results showed that metallic silvers with diameter 15 nm were distributed on the surface of g-C3N4 thin-layered. The specific surface area of the composite was 563.4 m2 g−1. As the final products for ozonation, oxalic acid was used to investigate its catalytic ability in heterogeneous photocatalytic ozonation under simulated solar light irradiation. Ordered Ag-g-C3N4/SBA-15 with the mass ratio of silver nitrate/dicyandiamide around 4% was found to be the most efficient for oxalic acid degradation. The kinetic constant was 1.60 and 2.52 times as high as that of solar light/Ag-g-C3N4/O3 and solar light/g-C3N4/O3 process, respectively. It demonstrated that both the Ag nanoparticles and improved specific surface area contributed to the enhancement, which promoted the decomposition of O3 and increased the active sites in reaction. The synergy index for photocatalytic ozonation of oxalic acid was calculated to be 5.71, which indicated a superior synergistic effect between photocatalysis and ozonation. In addition, 4% Ag-g-C3N4/SBA-15 samples showed good stability in photocatalytic ozonation process by cycled for four times, and the mechanism was also confirmed in this study. It is suggested that Ag-g-C3N4/SBA-15 composites is a promising catalyst for the practical application of photocatalytic ozonation.
ISSN: 1010-6030
DOI: 10.1016/j.jphotochem.2017.09.017
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