Photocatalytic Performance of Hierarchical TiO2/Ag3PO4 Composite Under Visible-light Illumination†

doi:10.7503/cjcu20140870

Abstract

Abstract:

Urchin-like TiO₂ nanomaterial with hierarchical structure(PTHSs) was prepared, then Ag₃PO₄ nanomaterial with visible-light response was deposited on the hierarchical TiO₂ by simple deposition precipitation method, thus a series of PTHSs/Ag₃PO₄ composites with efficient visible-light photocatalytic performance and stability was synthesized. The photocatalytic performance of the PTHSs/Ag₃PO₄ composites for degrading Rhodamine B(RhB) was analyzed. The results show that the photocatalytic performance of PTHSs/Ag₃PO₄ composite is significantly superior to that of pure Ag₃PO₄ and that of TiO₂(P25)/Ag₃PO₄ composite. The composite with a PTHSs/Ag₃PO₄ molar ratio of 1∶1 showed the best photocatalytic performance and it could decolorize the RhB completely in 6 min under visible light illumination. This is because that the urchin-like TiO₂ nanomaterial can provide more load sites than TiO₂ nanoparticle for loading Ag₃PO₄. And the hierarchical TiO₂ can also improve the contact between the surfaces of TiO₂ and Ag₃PO₄ so that the separated efficiency of photo-generated electrons-holes by Ag₃PO₄ is improved. Meanwhile during the photodegradation process, a little Ag⁺ on the surface of Ag₃PO₄ are gradually reduced to Ag⁰, by the plasma resonace effect of which, the absorption and conversion capability of the composite for photon are enhanced and the photocataly-tic performance of the composite material for degrading dyes is further enhanced.

Key words: Hierarchical TiO2, Ag3PO4, Visible-light photocatalysis, Interface effect, Heterojunction

CLC Number:

O645

TrendMD:

LI Weibing, FENG Chang, YUE Jiguang, HUA Fangxia, BU Yuyu. Photocatalytic Performance of Hierarchical TiO₂/Ag₃PO₄Composite Under Visible-light Illumination^†[J]. Chem. J. Chinese Universities, 2015, 36(6): 1194.

Figures/Tables 6

Fig.1 XRD patterns of pure PTHSs(a) and PTHSs/Ag3PO4 composites(b—d) n(PTHSs)∶n(Ag3PO4): b. 2∶1; c. 1∶1; d. 1∶2.

Fig.2 SEM images of PTHSs(A) and PTHSs/Ag3PO4 composites(B—D)Inset in (A) is an enlarged gragh of part of a PTHS particle. n(PTHSs)∶n(Ag3PO4): (B) 2∶1; (C) 1∶1; (D) 1∶2.

Fig.3 TEM images(A, B) and EDS spectrum(C) of the PTHSs/Ag3PO4(1∶1) composite (B) is the high resolution image of the framed part in (A).

Fig.4 UV-Vis diffuse reflectance spectra of pure PTHSs(a), different PTHSs/Ag3PO4 composites(b—d) and pure Ag3PO4(e)n(PTHSs)∶n(Ag3PO4): b. 2∶1; c. 1∶1; d. 1∶2.

Fig.7 Recycling test of PTHSs∶Ag3PO4(1∶1) for photocatalytic degradation of RhB under visible light

Fig.9 Proposed mechanism of PTHSs/Ag3PO4 composite materials for enhancing photocatalytic property

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Photocatalytic Performance of Hierarchical TiO₂/Ag₃PO₄Composite Under Visible-light Illumination^†

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