Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 926, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166904
Keywords
Persulfate; Graphene aerogel; Photocatalytic activation; g-C3N4; Visible light
Categories
Funding
- NSFC [22076039, 51808199]
- China Postdoctoral Science Foundation [2018M630825, 2019T120624]
- Excellent Science and Technology Innovation Team of Henan Normal University [2021TD03]
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This study investigated the degradation of methyl orange using visible-light-driven photocatalytic activation of persulfate. A macro-aerogel g-C3N4-doped graphene aerogel composite with a stratified structure was fabricated and applied as a recoverable heterogeneous catalyst for the activation of persulfate under visible light irradiation. The catalytic efficiency of the composite was enhanced significantly after modification with g-C3N4, and the GCN-3/VL/PDS system showed promising potential for practical wastewater purification due to its flexibility and recyclability.
In the present work, the degradation of methyl orange (MO) by visible-light-driven photocatalytic activation of persulfate (PDS) was studied. Macro-aerogel g-C3N4-doped graphene aerogel (GA) composite with stratified structure was fabricated by a simple hydrothermal method and applied as a recoverable heterogeneous catalyst along with visible light (VL) irradiation for activation of PDS. The microstructure, physical-chemical and photoelectrochemical properties of composite catalysts were characterized and various reaction parameters including the reaction systems, catalyst activator dose, PDS concentration, g-C3N4 doping amount and the initial pH of the solution were evaluated on the MO removal efficiency. Photocatalytic activation of GA for MO degradation was enhanced significantly after modified by g-C3N4. Under optimum conditions (15 mg/L MO, 75 mg/L PDS and 0.012 g/L GCN-3), the catalytic efficiency of g-C3N4 doped GA with the mass ratio of 3:7 (GCN-3) was 2.96 times than that of GA. The strengthening effect of GCN-3 benefited from the synergistic effect of the photogenerated hole (h(+)), the C=O functional groups and rapid electron transfer in GCN-3/VL/PDS system. Given the flexibility and recyclability of GCN-3, the GCN-3/VL/PDS system is a promising technique for practical wastewater purification. (c) 2022 Elsevier B.V. All rights reserved.
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