Morphology Modulation and Photocatalytic Performance of Microcrystal of Silver Salt of Ti-substituted Keggin-type Polyoxotungstate†

doi:10.7503/cjcu20170800

Abstract

Abstract:

Silver salts of Ti-substituted Keggin-type polyoxotungstate(Ag₄H₃PTi₂W₁₀O₄₀, AgPTiW) with different morphologies and sizes were synthesized with potassium dititanodecatungsto-phosphate and silver nitrate as precursors, polyvinylpyrrolidone with various dosage as morphology modulator. The concentration of Ag⁺ in saturated solution of AgPTiW was measured by spectrophometric method, and its solubility product was then obtained. Furthermore, the standard electrode potential of Ag₄H₃PTi₂W₁₀O₄₀/Ag was calculated by Nernst equation, and thus the conduction band of AgPTiW was located. Crystal structures and optical absorption properties of AgPTiW with different morphologies were characterized by infrared spectra(FTIR), powder XRD analysis and UV-Vis diffuse reflectance spectra. Photocatalytic degradation of methyl orange tests were carried out over AgPTiW with different morphologies under visible-light irradiation(λ>400 nm). The results showed that the visible-light catalytic activity of AgPTiW with nanowire shape was better than that with rod or columnar morphology. It might be related to the highest aspect ratio and the highest specific surface area of nanowire catalyst.

Key words: Keggin-type polyoxotungstate, Ag salt, Ti substitution, Morphology modulation, Photocatalysis

CLC Number:

O614

TrendMD:

HAN Ning, XIE Ruihong, WANG Xuena, LIU Shuxia. Morphology Modulation and Photocatalytic Performance of Microcrystal of Silver Salt of Ti-substituted Keggin-type Polyoxotungstate^†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1378.

Figures/Tables 4

Fig.1 SEM images of S0(A), S50(B), S100(C) and S200(D)

Fig.2 FTIR spectra(A), XRD patterns(B) and UV-Vis diffusive reflectance spectra(C) of S0(a), S50(b), S100(c) and S200(d), respectively^ Inset: (αhν)1/2-hν curves to determine the band gap of S0, S50, S100 and S200, respectively.

Fig.3 Schematic diagram of redox potential of Ag4H3PTi2W10O40

Fig.4 MO concentration(c/c0) change with time(t) over S0, S50, S100 and S200 under visible-light irradiation(λ>400 nm)

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