Synthesis of TiO2/Ag2NCN Composite Catalysts and Their Photocatalytic Activity Under Visible Light Irradiation†

doi:10.7503/cjcu20140532

Abstract

Abstract:

TiO₂/Ag₂NCN composite catalysts were fabricated through the precipitation of silver salt and cya-namide in the presence of TiO₂ nanoparticles. X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and Ultraviolet-visible(UV-Vis) spectoscopy were used to characterize the composites. The results showed that the heterojunction structure was obtained by depositing TiO₂ nanoparticles on the surface of Ag₂NCN through weak physical interaction. The UV-Vis absorption peak of TiO₂/Ag₂NCN shift toward long wavelength and the energy gap narrow down in comparison with that of pure Ag₂NCN. The degradation of methylene blue(MB) catalyzed by the samples under visible-light irradiation was investigated and enhanced photocatalytic activity was observed for TiO₂/Ag₂NCN composite particles. The energy band structure of composite particles demonstrates that the presence of TiO₂ promote the separation of photogenerated electron and hole, and as a result, improves the photocatalytic activity.

CLC Number:

O644
O611.6

TrendMD:

LI Xia, ZHANG Xia, ZHU Zefeng, LIN Guoqing, LI Youbin, LI Xiaoxue, XU Junli. Synthesis of TiO₂/Ag₂NCN Composite Catalysts and Their Photocatalytic Activity Under Visible Light Irradiation^†[J]. Chem. J. Chinese Universities, 2015, 36(2): 361.

Figures/Tables 10

Fig.1 SEM images of Ag2NCN(A) and TiO2/Ag2NCN composites with various addition amounts of TiO2(B—F) B) 2%TiO2/Ag2NCN; (C) 5%TiO2/Ag2NCN; (D) 10%TiO2/Ag2NCN; (E) 30%TiO2/Ag2NCN; (F) 50%TiO2/Ag2NCN. The circles in (B), (C) and (D) mark the TiO2 nanoparticles.

Fig.2 XRD patterns of Ag2NCN(a), TiO2(b) and 10%TiO2/Ag2NCN composites(c)

Fig.3 FTIR spectra of Ag2NCN(a) and 10%TiO2/Ag2NCN(b)

Fig.4 UV-Vis diffuse reflectance spectra of Ag2NCN and TiO2/Ag2NCN composite particles a. Ag2NCN; b. 1%TiO2/Ag2NCN; c. 2%TiO2/Ag2NCN; d. 5%TiO2/Ag2NCN; e. 10%TiO2/Ag2NCN; f. 30%TiO2/Ag2NCN; g. 50%TiO2/Ag2NCN.

Fig.5 (Ahν)2-(hν) curves of Ag2NCN and TiO2/Ag2NCN composite particles a. Ag2NCN; b. 1%TiO2/Ag2NCN; c. 2%TiO2/Ag2NCN; d. 5%TiO2/Ag2NCN; e. 10%TiO2/Ag2NCN; f. 30%TiO2/Ag2NCN; g. 50%TiO2/Ag2NCN.

Table 1 Eg of Ag2NCN and TiO2/Ag2NCN composite particles

Sample	E_g/eV	Sample	E_g/eV
Ag₂NCN	2.42	10%TiO₂/Ag₂NCN	2.31
1%TiO₂/Ag₂NCN	2.36	30%TiO₂/Ag₂NCN	2.28
2%TiO₂/Ag₂NCN	2.34	50%TiO₂/Ag₂NCN	2.26
5%TiO₂/Ag₂NCN	2.33

Fig.6 Degradation kinetics of MB by Ag2NCN and TiO2/Ag2NCN composite particles

Table 2 Kinetic fitting parameters obtained by first order kinetics equation

Sample	k/h^-1	R²	Sample	k/h^-1	R²
Ag₂NCN	0.5253	0.9962	10%TiO₂/Ag₂NCN	0.6804	0.9958
1%TiO₂/Ag₂NCN	0.5175	0.9979	30%TiO₂/Ag₂NCN	0.7255	0.9896
2%TiO₂/Ag₂NCN	0.5685	0.9971	50%TiO₂/Ag₂NCN	0.8127	0.7195
5%TiO₂/Ag₂NCN	0.6219	0.9748

Fig.7 Mott-Schottky plots of prepared Ag2NCN(A) and TiO2 particles(B)

Fig.8 Sketching map of band structure of TiO2/Ag2NCN composite particles

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Synthesis of TiO₂/Ag₂NCN Composite Catalysts and Their Photocatalytic Activity Under Visible Light Irradiation^†

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