Enhancement of photocatalytic and photoelectrocatalytic activity of Ag modified Mpg-C 3 N 4 composites

He, Qiuchen; Zhou, Feng; Zhan, Shu‐Zhong; Yang, Yifan; Liu, Yujun; Tian, Yu; Huang, Naibao

doi:10.1016/j.apsusc.2016.07.005

Cited by 64 publications

(22 citation statements)

References 53 publications

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“…Due to the SPR effect of metallic Ag, the generation rate of e CB – and h VB + of g-C 3 N 4 was increased. 47 Second, the electrons on CB of the g-C 3 N 4 were transferred to the surface of Ag nanoparticles rapidly, and these accumulated that electrons in the Ag nanoparticles could reduce O 2 to yield ·O 2 – (−0.046 V vs NHE) radicals, which produced additional hydroxyl radicals (·OH). 48 However, the energy potential of h VB + of g-C 3 N 4 (+1.87 eV) was not sufficiently positive to react with OH – to generate ·OH radicals (+1.99 V vs NHE).…”

Section: Results and Discussionmentioning

confidence: 99%

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Liu

Yang

et al. 2020

ACS Omega

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Ag-decorated g-C 3 N 4 (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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Section: Results and Discussionmentioning

confidence: 99%

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Liu

Yang

et al. 2020

ACS Omega

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“…It was found that rGO/AgCl QDs exemplified smaller semicircle size than that of bare AgCl QDs, indicating a superior charge separation of photoexcited charges. 41 Excellent PEC activity and stability of the samples were studied by the abatement of TC (20 mg/L) under visible light at a bias voltage of 1.5 V. As shown in Figure 7A, rGO/AgCl QDs showed higher degradation efficiency of 85.2% than that of pure AgCl QDs (33%). Besides, the calculated rate constants of rGO/AgCl QDs ( Figure S5A) were 3.26 times that of AgCl QDs, which could be accredited to the strong visible light absorption and restrained charge carrier recombination of rGO/AgCl QDs.…”

Section: Resultsmentioning

confidence: 98%

“…Besides, EIS Nyquist plots of the samples (Figure D) were performed to further evaluate the charge transfer efficiecy. It was found that rGO/AgCl QDs exemplified smaller semicircle size than that of bare AgCl QDs, indicating a superior charge separation of photoexcited charges …”

Section: Resultsmentioning

confidence: 99%

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

et al. 2019

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A novel rGO/AgCl QDs composites have been obtained by an ultrasonic‐assisted method for the first time. Photoelectrocatalytic (PEC) performances of the obtained samples were studied by the degradation of 20 mg/L Tetracycline (TC) under visible light irradiation with an applied bias potential of 1.5 V (vs Ag/AgCl). Degradation of TC by different processes including Photocatalysis (PC), Electrocatalysis (EC), and PEC was compared, and the effect of different bias potential on the PEC degradation of TC was discussed. Results showed that rGO/AgCl QDs composites had displayed superior PEC activity than that of pristine AgCl QDs with degrading 85.2% of TC during 120 minutes, which was about 1.5 times higher than that of AgCl QDs (33%). Besides, compared to PC and EC removal of TC, PEC process showed the highest degradation efficiency of TC (85.2%) by rGO/AgCl QDs, which was about three times and one time higher than that of PC (39.18%) and EC (20.73%) system, respectively. Moreover, the reusibility and stability of the samples were tested by five times cycling tests, and results demonstrated that the stability of bare AgCl QDs was improved after the introduction of rGO. The enhanced PEC activity and stability of the samples could be attributed to the intimate contact between rGO and AgCl QDs and external electric field, which had benefitted the formation of more active sites and accelerated electron‐hole separation.

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“…Based on the calculation, the mass ratio of Ag and g‐C 3 N 4 was 3% in the final samples. Lastly, the obtained samples were washed by deionized water …”

Section: Methodsmentioning

confidence: 99%

Research on the oxygen reduction reaction (ORR) mechanism of g‐C₃N₄ doped by Ag based on first‐principles calculations

Zhang

Huang

Zhou

et al. 2018

J Chinese Chemical Soc

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Developing non‐platinum composite catalysts has become a hot research topic for the oxygen reduction reaction (ORR). In this study, Ag/g‐C3N4 (the mass ratio of Ag and g‐C3N4 = 3%) catalysts were prepared through a photoreduction method. The catalytic performance of g‐C3N4 was greatly enhanced after Ag doping. The current density of Ag/g‐C3N4 was −21 μA/mm2, which is 3 times that of pure g‐C3N4. The mechanism of ORR activity enhancement is discussed based on first‐principles calculation. Ag, as the active site, can reduce the reaction barrier and enhance ORR activity. Combining experimental and computational results forms the subject of this study.

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Enhancement of photocatalytic and photoelectrocatalytic activity of Ag modified Mpg-C 3 N 4 composites

Cited by 64 publications

References 53 publications

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

Research on the oxygen reduction reaction (ORR) mechanism of g‐C₃N₄ doped by Ag based on first‐principles calculations

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Enhancement of photocatalytic and photoelectrocatalytic activity of Ag modified Mpg-C 3 N 4 composites

Cited by 64 publications

References 53 publications

Ag-Modified g-C3N4 Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Ag-Modified g-C3N4 Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

Research on the oxygen reduction reaction (ORR) mechanism of g‐C3N4 doped by Ag based on first‐principles calculations

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Product

Resources

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Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Ag-Modified g-C₃N₄ Prepared by a One-Step Calcination Method for Enhanced Catalytic Efficiency and Stability

Research on the oxygen reduction reaction (ORR) mechanism of g‐C₃N₄ doped by Ag based on first‐principles calculations