Journal
ACS OMEGA
Volume 5, Issue 31, Pages 19615-19624Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c02161
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Funding
- Natural Science Foundation of China [21663009]
- Excellent Youth Fund of Guizhou Province [[2017]5605]
- Platform and Talent Program from Guizhou Province [[2017]5788]
- Joint Project of Science and Technology Department of Guizhou Province [LH[2014] 7621]
- Science and Technology Project of Guizhou Province [2019[2835]]
- National key Research and Development project [2018YFC1801706-1]
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Ag-decorated g-C3N4 (denoted as Ag/CN-x) was prepared by a one-step calcination method, and the influences of calcination time on structure, morphology, surface composition, photocatalytic performance, and catalytic reduction activity of the prepared Ag/CN-x samples were investigated. The tests showed that the Ag/CN-8 prepared through by calcination for 8 h exhibited the best photocatalytic degradation efficiency of methyl orange (98.7% within 2 h) and the best catalytic reduction property of 4-nitrophenol (100% within 70 s). Meanwhile, these Ag/CN-x samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS), photoluminescence (PL), photocurrent response, and electrochemical impedance spectroscopy (EIS) Nyquist plots. It was found that the Ag/CN-8 prepared through calcination for 8 h had a higher specific surface area, higher dispersibility of silver nanoparticles (Ag NPs), the widest range of visible light response, and the lowest photogenerated electron-hole recombination rate. The results of the trapping experiments indicated that a superoxide radical plays a major role. Moreover, a possible mechanism of photocatalytic degradation in methyl orange and catalytic reduction 4-nitrophenol was proposed.
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