Preparation of Protonated g-C3N4/β-SiC Composites and Photocatalytic Degradation of Alizarin Red S †

doi:10.7503/cjcu20190215

Abstract

Abstract:

Graphite phase carbonitride(g-C₃N₄) and silicon carbide(β-SiC) were synthesized by pyrolysis and sol-gel-carbothermic reduction method, respectively. Then, they were combined by the impregnation-heat treatment and protonated by concentrated hydrochloric acid to prepare g-C₃N₄/β-SiC and protonated g-C₃N₄/β-SiC(P-g-C₃N₄/β-SiC) composite photocatalysts. The samples were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), high resolution transmission electron microscopy(HRTEM), Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), UV-Vis diffuse reflectance spectroscopy(UV-Vis-DRS) and phototluminescence(PL) characterization. The results show that the P-g-C₃N₄/β-SiC composite did not retain the lamellar morphology and its specific surface area is significantly increased. The UV-Vis-DRS and PL spectra indicate that the recombination probability of photogenerated electron-hole pairs is significantly reduced, and the band gap is significantly improved. At the same time, experiments revealed that the combination of g-C₃N₄ and β-SiC and protonation can have a positive effect on the effective separation of photogenerated electron-hole pairs. In addition, the catalysts were applied to photocataly-tic degradation of alizarin red S(ARS). The results show that the order of visible light photocatalytic activity of the samples is P-g-C₃N₄/β-SiC>g-C₃N₄/β-SiC>P-g-C₃N₄>g-C₃N₄>β-SiC. The degradation efficiency of sample P-g-C₃N₄/β-SiC to ARS was up to 99.9% within 60 min, which accorded with the pseudo first-order kinetic model. The rate constant was 0.0967 min ^-1. After 9 times of cycle, the photocatalytic degradation efficiency of P-g-C₃N₄/β-SiC for ARS remained above 97.5%.

Key words: g-C₃N₄/β-SiC, Protonation, Photocatalytic degradation, High efficiency cycle, Alizarin red S

CLC Number:

O644.1

TrendMD:

WU Zhiqiang, LIU Wanyi, WANG Gang, CAI Wei, YUE Xiaofei, ZHAN Haijuan, BI Shuxian, MENG Zhe, MA Baojun. Preparation of Protonated g-C₃N₄/β-SiC Composites and Photocatalytic Degradation of Alizarin Red S ^†[J]. Chem. J. Chinese Universities, 2019, 40(10): 2178.

Figures/Tables 9

Fig.1 XRD patterns of different materials

Fig.2 SEM images of β-SiC(A), g-C3N4(B), P-g-C3N4(C), g-C3N4/β-SiC(E) and P-g-C3N4/β-SiC(F) and HRTEM image of g-C3N4/β-SiC(D)

Fig.3 FTIR spectra of g-C3N4, P-g-C3N4 and P-g-C3N4/β-SiC

Fig.4 XPS spectra of C1s(A, C) and N1s(B, D) of P-g-C3N4/β-SiC(A, B) and P-g-C3N4(C, D)

Fig.5 UV-Vis-DRS spectra(A) and band gap energy(B) of β-SiC, g-C3N4, g-C3N4/β-SiC, P-g-C3N4 and P-g-C3N4/β-SiC

Fig.6 PL spectra of g-C3N4, g-C3N4/β-Si, P-g-C3N4 and P-g-C3N4/β-SiC

Fig.7 Photodegradation curves(A) and pseudo-first-order kinetics curves(B) of the degradation of ARS by different photocatalysts

Fig.8 Cycling performance of P-g-C3N4/β-SiC for degradation of ARS

Fig.9 Plots of photogenerated carriers trapping in the system of photodegradation of ARS by P-g-C3N4/β-SiC

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Preparation of Protonated g-C₃N₄/β-SiC Composites and Photocatalytic Degradation of Alizarin Red S ^†

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