Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 574, Issue -, Pages 110-121Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.04.038
Keywords
G-C3N4; Antibiotic; Ag; Photocatalysis; Porous structure; Degradation pathway
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Funding
- National Natural Science Foundation of China [21577039, 41907344, 21777047, 21876027]
- Science and Technology Planning Project of Guangzhou City [201804020026]
- Guangdong Natural Science Foundation, China [2018A030313734, 2017A030311019]
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Ag/g-C3N4 plasmonic photocatalysts with porous structure (Ag/PCN) were successfully synthesized via a thermal exfoliation strategy and photo-reduction method. Owing to the combined merits of porous structure and surface plasmon resonance effect of silver nanoparticles, the Ag/PCN catalysts exhibited excellent photocatalytic performance for the degradation of antibiotic agents. With the optimal Ag loading, the Ag/PCN-2 catalyst exhibited the optimal catalytic activity for TC degradation under visible light, which shows about 11.8 times enhancement in the photocatalytic removal efficiency as compared to pure g-C3N4, respectively. This phenomenon can be attributed to the increased specific surface area, broadened visible light absorption and improved charge separation. The radical quenching results confirmed that h(+ ) and center dot O-2 radicals were the major active species during removal of TC. The degradation of TC is increased with the increment of Ag/PCN-2 catalysts, and the optimum catalyst was found to be 1.67 g/L. The hindering effect of selected of anions (Cl, CO3, H2PO4) was found to follow the order H2PO4 > CO3 > Cl. Ag/PCN-2 sample also possessed high stability after six cycles of reuses. Furthermore, the possible degradation pathways of TC and photocatalytic mechanism over Ag/PCN-2 were proposed in detail. (C) 2020 Elsevier Inc. All rights reserved.
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