Construction of Ag2CO3/Bi2O2CO3 p-n Heterojunction and Its Photocatalytic Activity †

doi:10.7503/cjcu20190329

Abstract

Abstract:

Ag₂CO₃/Bi₂O₂CO₃(BOC) composite photocatalysts were prepared by a successive precipitation strategy. SEM and TEM results showed that Ag₂CO₃ nanoparticles were dispersively deposited on the surface of BOC nanosheets. A good p-n heterojunction structure was formed between the two semiconductors. The surface composite of Ag₂CO₃ effectively widened the light absorption of BOC and promoted the separation of photoinduced carriers. Accordingly, the photoactivity of Ag₂CO₃/BOC composite was greatly improved. In particular, the sample with Ag₂CO₃ content of 0.62% showed the best photocatalytic behavior with degradation rate improved by 1.8 times compared with that of BOC. Combining the detected oxidation species and the band positions of the semiconductors, the formation of space charge layer and the charge migration at the p-n heterojunction interface of Ag₂CO₃ and BOC were proposed.

Key words: Bi₂O₂CO₃, Ag₂CO₃, p-n Heterojunction, Photocatalysis, Charge migration

CLC Number:

O644
O643.3

Junjin WANG,Guoying ZHANG,Yaqiu SUN,Jingwang LIU. Construction of Ag₂CO₃/Bi₂O₂CO₃ p-n Heterojunction and Its Photocatalytic Activity ^†[J]. Chemical Journal of Chinese Universities, 2019, 40(12): 2590-2597.

Figures/Tables 11

Fig.1 XRD patterns of BOC and Ag2CO3/BOC samples

Fig.2 Survey(A) and high resolution Ag3d(B) XPS spectra for BOC and AB-0.62%

Fig.3 SEM images of BOC(A), AB-0.31%(B), AB-0.62%(C) and AB-1.24%(D)

Fig.4 TEM image(A), HRTEM image(B) and element mapping images(C—E) of AB-0.62% (C) Bi; (D) O; (E) Ag.

Fig.5 UV-Vis DRS(A) and PL(B) spectra of BOC, Ag2CO3 and of AB composites

Fig.6 Photocatalytic activity (A) and first-order kinetic plots for degradation of RhB by different samples(B)

Fig.7 Degradation process of RhB over BOC(A) and AB-0.62%(B) The inset in (B) is the photoactivity comparison of AB-0.62%(a) with samples prepared according to ref.[19](b) and ref.[20](c).

Fig.8 Comparison of photodegradation for different dyes of AB-0.62% after 40 min irradiation time(A) and cycle stability(B) of AB-0.62% fro degradation of RhB

Fig.9 Results of reactive species trapping experiments(A) and ESR spectra of radical adducts trapped by DMPO in AB-0.62% in methanol(B) and aqueous(C) dispersions

Fig.10 Photocurrent response(A) and Nyquist plots(B) of BOC and AB-0.62% composite

Fig.11 Schematic illustration of the charge separation and migration on the surface of AB-0.62%

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Construction of Ag₂CO₃/Bi₂O₂CO₃ p-n Heterojunction and Its Photocatalytic Activity ^†

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