Synthesis, Photocatalytic Activity and Regeneration of AgBr/CuO Heterojunction Photocatalyst†

doi:10.7503/cjcu20150522

Abstract

Abstract:

AgBr/CuO p-n heterojunction photocatalyst was prepared by precipitation method and characterized by X-ray diffraction(XRD), UV-Vis spectroscopy(UV-Vis), field emission scanning electron microscopy(FESEM) and X-ray photoelectron spectroscopy(XPS), respectively. The photocatalytic mechanism was speculated through active species test and band structure analysis. Besides, the used AgBr/CuO was regenerated by 3%(mass fraction) bromine water. The results show that the degradation rate of methyl orange(c₀=15 mg/L) over 0.1 g AgBr/CuO was maintained at 92% after 30 min, which was much higher than that over pure AgBr under the same conditions. The reasons for improving the photocatalytic activity of AgBr/CuO photocatalyst are that the band gap of AgBr/CuO photocatalyst become wider and the p-n heterojunction structure is formed between AgBr and CuO. The wider band gap was benefit for the redox ability of photogenerated electrons and photogenerated holes. The p-n heterojunction structure of photocatalyst could accelerate the shift of electrons and the separation of e^--h⁺. In addition, the use of bromine water regeneration method could significantly restore photocatalytic activity.

Key words: p-n Heterojunction, AgBr/CuO, Bromine water regeneration, Photocatalysis

CLC Number:

O644

TrendMD:

ZHANG Xue, LIU Jianxin, WANG Yawen, FAN Caimei, DUAN Donghong, WANG Yunfang. Synthesis, Photocatalytic Activity and Regeneration of AgBr/CuO Heterojunction Photocatalyst^†[J]. Chem. J. Chinese Universities, 2016, 37(1): 88.

Figures/Tables 7

Fig.1 XRD patterns of AgBr/CuO(a), U-AgBr/CuO(b), Re-AgBr/CuO(c) and AgBr(d)

Fig.2 FESEM images of CuO(A), AgBr(B), AgBr/CuO(C) and Re-AgBr/CuO(D)

Fig.3 UV-Vis spectra for CuO(a), AgBr(b) and AgBr/CuO(c)(A) and (αhν)1/2-hν plots of AgBr(a) and AgBr/CuO(b)(B)

Fig.4 XPS spectra of AgBr/CuO(a), Re-AgBr/CuO(b) and U-AgBr/CuO(c)^ (A) Survey; (B) Ag3d; (C) Br3d; (D) O1s.

Fig.5 Degradation of MO(A) and phenol(B) under visible light irradiation with different photocatalysts^ a. AgBr/CuO; b. AgBr; c. CuO; d. no photocatolyst.

Fig.6 Degradation of MO with Re-AgBr/CuO, U-AgBr/CuO, Re-AgBr and U-AgBr in different cycles

Fig.7 Effects of different scavengers on the degradation of MO in the presence of AgBr/CuO and AgBr under visible-light irradiation

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