Preparation and Properties of Ag@C3N4 Photocatalyst Supported by Hydrogel

doi:10.15541/jim20210535

Abstract

Abstract:

Graphitic carbon nitride (g-C₃N₄) is widely used in the field of photocatalysis due to its unique two-dimensional planar structure and suitable energy band structure. However, it has some disadvantages such as fast recombination of the electron-hole, low visible-light utilization efficiency and poor dispersion in water, which hinder its application. In this study, the hydrogel prepared by sodium alginate was used as matrix to improve the dispersion of Ag@C₃N₄ composite in water, and at the same time enhanced the separation efficiency of photoelectron-holes pairs, thus improving its photocatalytic performance. Firstly, g-C₃N₄ was synthesized by thermal polymerization and then exfoliated into nanosheets by ultrasound. Then, Ag nanoparticles were deposited in situ on the surface of g-C₃N₄ by solution method to prepare Ag@C₃N₄. Finally, hydrogel loaded with Ag@C₃N₄ (SA/Ag@C₃N₄) was obtained by using calcium ion as crosslinker and sodium alginate (SA) as precursor. The morphology, microstructure and phase composition of the as-prepared photocatalyst were characterized. The as-prepared SA/Ag@C₃N₄ exhibited a 1.5 times higher photocatalytic degradation rate of methyl orange than that of Ag@C₃N₄. The catalytic mechanism was investigated by photoluminescence spectrum, time resolved photoluminescence spectrum and electron paramagnetic resonance spectrum. The results showed that the surface plasmon resonance effect of silver nanoparticles together with the porous structure and mass transfer channel of sodium alginate hydrogel plays a synergistic role in the enhancement of photocatalytic performance.

Key words: carbon nitride, silver nanoparticles, sodium alginate, hydrogel, photocatalysis

CLC Number:

TQ426

WANG Xiaojun, XU Wen, LIU Runlu, PAN Hui, ZHU Shenmin. Preparation and Properties of Ag@C₃N₄ Photocatalyst Supported by Hydrogel[J]. Journal of Inorganic Materials, 2022, 37(7): 731-740.

Figures/Tables 13

Fig. 1 Macro morphologies of g-C3N4 (a), Ag@C3N4 (b), SA (c), and SA/Ag@C3N4 (d)

Fig. 2 SEM images of C3N4 (a), Ag@C3N4 (b) and SA/Ag@C3N4 (c, d), TEM (e) and HRTEM (f) images of Ag@C3N4

Fig. 3 FT-IR spectra of C3N4, Ag@C3N4, SA, and SA/Ag@C3N4 Colorful figures are available on the website

Fig. 4 XRD patterns of C3N4, Ag@C3N4, SA and SA/Ag@C3N4 (a), and magnified XRD patterns of SA/Ag@C3N4(b) Colorful figures are available on the website

Fig. 5 N2 adsorption-desorption isotherms (a) and pore size distribution curves (b) of C3N4, Ag@C3N4 and SA/Ag@C3N4 Colorful figures are available on the website

Fig. 6 SEM image (a) and EDX element mappings of Ag@C3N4 sample ((b) C, (c) N, (d) Ag)

Fig. 7 XPS spectra of C3N4 (a, b), Ag@C3N4 (c, d) and SA/Ag@C3N4 (e-g) (a, c, e) C1s; (b, d, f) N1s; (g) Ag3d

Fig. 8 Methyl orange degradation curves (a), degradation rates (b) of C3N4, Ag@C3N4, SA, and SA/Ag@C3N4, and cyclic stability(c) of SA/Ag@C3N4 Colorful figures are available on the website

Fig. 9 PL (a) and TRPL (b) spectra of C3N4, Ag@C3N4 and SA/Ag@C3N4 Colorful figures are available on the website

Fig. 10 (a) UV-Vis diffuse reflection spectra and (b) (αhν)0.5 vs hν curves of C3N4, Ag@C3N4, SA and SA/Ag@C3N4 Colorful figures are available on the website

Fig. 11 EPR spectra of C3N4 (a, b), Ag@C3N4 (c, d) and SA/Ag@C3N4 (e, f) during detecting ·OH (a, c, e) and ·O2- (b, d, f) Colorful figures are available on the website

Fig. 12 Transient photocurrent curves (a) and EIS curves (b) of C3N4 and Ag@C3N4 Colorful figures are available on the website

Fig. 13 Schematic diagram and catalytic mechanism of SA/Ag@C3N4

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Preparation and Properties of Ag@C₃N₄ Photocatalyst Supported by Hydrogel

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