One-step Preparation of H3PW12O40/Bi2WO6 Nano-photocatalysts by Microwave Liquid Process and Its Photocatalysis Denitrification Properties†

doi:10.7503/cjcu20140021

Abstract

Abstract:

Immobilized nano-photocatalysts H₃PW₁₂O₄₀/Bi₂WO₆ was prepared by microwave liquid one-step process. The morphology, structure and properties of the prepared catalysts were characterized and investigated by UV-Vis diffuse reflectance spectra, scanning electron microscopy(SEM), NH₃ temperature programmed desorption(NH₃-TPD), pyridine adsorption Fourier transform infrared spectroscopy(Py-FTIR) and X-ray diffraction(XRD), respectively. Their photocatalytic denitrification properties were evaluated by using the model oil with 15 mg/g pyridine. The results show that H₃PW₁₂O₄₀/Bi₂WO₆ photocatalysts could be more efficiently synthesized by microwave liquid one-step process, and it could be excited by lower photon energy than that synthesized by common impregnation immobilization method. Immobilization of H₃PW₁₂O₄₀ on Bi₂WO₆ could improve the acid content in Bi₂WO₆ nanoparticle surface, change the acid strength of Bi₂WO₆ precursor solution thereby controll the catalyst morphology. The influences of preparation conditions on photocatalytic properties of H₃PW₁₂O₄₀/Bi₂WO₆ were investigated. It was found that H₃PW₁₂O₄₀/Bi₂WO₆ nano-photocatalyst, with the H₃PW₁₂O₄₀ loading(mass fraction) of 15%, prepared by microwave liquid one-step process under microwave power 800 W for 90 min possessed the best performance in the photocatalytic denitrification of model oil containing photocatalysts(mass ratio of catalyst to model oil was 1/300) after 500 W Xe lamp irradiation for 60 min, with the denitrification rate reached 92.63%.

Key words: Microwave, One-step, H3PW12O40, Bi2WO6, Photocatalysis, Denitrification

CLC Number:

O644

CHEN Ying, XING Chen, JI Shenglun, LIANG Hongbao, ZHANG Hongyu, CHEN Yan. One-step Preparation of H₃PW₁₂O₄₀/Bi₂WO₆Nano-photocatalysts by Microwave Liquid Process and Its Photocatalysis Denitrification Properties^†[J]. Chemical Journal of Chinese Universities, 2014, 35(6): 1277-1285.

Figures/Tables 14

Fig.1 XRD patterns of Bi2WO6 prepared under 800 W microwave power for different reaction timet/min: a. 10; b. 30; c. 60; d. 90; e. 120.

Fig.2 SEM images of Bi2WO6 prepared under 800 W microwave power for different reaction timet/min: (A) 10; (B) 30; (C) 60; (D) 90; (E) 120.

Fig.3 XRD patterns of H3PW12O40/Bi2WO6 with different H3PW12O40 loadingsw(H3PW12O40)(%): a. 5; b. 10; c. 15; d. 20; e. 25.

Fig.4 SEM images of H3PW12O40/Bi2WO6 with different H3PW12O40 loadingsw(H3PW12O40)(%): (A) 5; (B) 10; (C) 15; (D) 20; (E) 25.

Fig.5 NH3-TPD spectra of H3PW12O40/Bi2WO6 with different H3PW12O40 loadingsw(H3PW12O40)(%): a. 5; b. 10; c. 15; d. 20; e. 25.

Fig.6 Pyridine adsorption FTIR spectrum of 15%H3PW12O40/Bi2WO6

Fig.7 N2 adsorption-desorption isotherms for 15%H3PW12O40/Bi2WO6(a) and Bi2WO6(b)

Fig.8 BJH pore size distribution curves of 15%H3PW12O40/Bi2WO6(a) and Bi2WO6(b)

Fig.9 UV-Vis diffuse reflectance spectra of Bi2WO6(a), H3PW12O40/Bi2WO6(T)(b) and H3PW12O40/Bi2WO6(c) catalysts

Fig.10 Mechanism of H3PW12O40/Bi2WO6 for coupling

Table 1 Results of denitrification performance of H3PW12O40/Bi2WO6(microwave power: 800 W; reaction time: 90 min) with different loadings of H3PW12O40 with or without light(photocatalytic time: 60 min)

w(H₃PW₁₂O₄₀)(%)	0	5	10	15	20	25
Denitrification rate(%)	80.78	82.29	85.96	92.63	89.21	86.46
Denitrification rate(without light)(%)	22.83	27.69	30.24	36.21	31.18	24.83

Fig.11 Denitrification performance of H3PW12O40/Bi2WO6 catalysts prepared under 800 W microwave power for different time and with different H3PW12O40 loadingsXenon lamp: 500 W; photocatalytic time: 60 min; mcatalyst/msimulated oil: 1/300. Sythestic time of catalysts/min: a. 10; b. 30; c. 60; d. 90; e. 120.

Fig.12 Denitrification rate of simulated oil with di-fferent addition amount of 15%H3PW12O40/Bi2WO6 and photocatalytic timeXenon lamp: 500 W; mcatalysts/msimulated oil: a. 1/500; b. 1/400; c. 1/300; d. 1/200.

Fig.13 Denitrification performance of catalysts for different cycle timesXenon lamp: 500 W; photocatalytic time: 60 min; mcatalysts/msimulated oil: 1/300.

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One-step Preparation of H₃PW₁₂O₄₀/Bi₂WO₆Nano-photocatalysts by Microwave Liquid Process and Its Photocatalysis Denitrification Properties^†

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