Photocatalytic Activity of Keggin Type Polyoxometalates XW12O40n-(X=P5+, Si4+, B3+, Zn2+) Toward Degradation of Methyl Orange†

doi:10.7503/cjcu20170592

Abstract

Abstract:

A series of Keggin type polyoxometalates with different central heteroatoms was prepared by the conventional aqueous synthesis method and characterized by powder X-Ray diffraction(PXRD), infrared spectroscopy(FTIR) and Raman spectroscopy(Raman). The optical and electrical activities of the polyoxometalates were studied by UV-Vis spectroscopy and cyclic voltammetry(CV). The influenece of central heteroatoms, catalyst dosage, substrate concentration and pH values on photocatalytic activity of the polyoxometalates toward methyl orange were investigated. The photodegradation activity of different Keggin type polyoxometalates toward methyl orange is in the order of ZnW₁₂>PW₁₂>SiW₁₂>BW₁₂.

Key words: Polyoxometalate, Photocatalytic activity, Dagradation, Organic dye

CLC Number:

O644
O611.3

TrendMD:

WANG Bin,WU Yingga,LIU Zhelin,WANG Xiaohong,AN Zhihua,ZENG Jun,YANG Peng,LIU Zongrui. Photocatalytic Activity of Keggin Type Polyoxometalates XW₁₂ $O 40 n -$ (X=P⁵⁺, Si⁴⁺, B³⁺, Zn²⁺) Toward Degradation of Methyl Orange^†[J]. Chem. J. Chinese Universities, 2018, 39(5): 1003.

Figures/Tables 11

Fig.1 Ball-stick(A) and polyhedral(B) structures of Keggin type heteropolyanions XW12O40n-(X=P5+, Si4+, B3+, Zn2+)

Fig.2 Powder XRD patterns of different Keggin type polyoxometalates Note:a. ZnW12; b. BW12; c. SiW12; d. PW12.

Table 1 Infrared vibrational peaks of XW12O40n- (X=P5+, Si4+, B3+, Zn2+)(cm-1)

Compound	$υ X — O a$	$υ W — O d$	$υ W — O c — W$	$υ W — O b — W$
PW₁₂	1082	980	889	792
SiW₁₂	1019	979	925, 879	783
BW₁₂	1004	958	911	807
ZnW₁₂	432	935	877, 833	783, 703

Table 1 Infrared vibrational peaks of XW12O40n- (X=P5+, Si4+, B3+, Zn2+)(cm-1)

Compound	$υ X — O a$	$υ W — O d$	$υ W — O c — W$	$υ W — O b — W$
PW₁₂	1082	980	889	792
SiW₁₂	1019	979	925, 879	783
BW₁₂	1004	958	911	807
ZnW₁₂	432	935	877, 833	783, 703

Fig.3 Raman spectra of different Keggin type polyoxometalates Note:a. ZnW12; b. BW12; c. SiW12; d. PW12.

Fig.4 UV-Vis absorption spectra of different Keggin type polyoxometalates Note: a. ZnW12; b. BW12; c. SiW12; d. PW12.

Fig.5 Cyclic voltammetry of Keggin type polyoxometalates Note:a. PW12; b. SiW12; c. BW12; d. ZnW12.

Fig.6 Degradation rate of methyl orange(A) and degradation ratio vs. irradiation time(B) using XW12O40n-(X=Zn2+, B3+, Si4+, P5+) as photocatalysts

Fig.7 Degradation rate of methyl orange with different ZnW12 catalyst concentrations

Fig.8 Degradation rate of methyl orange with different concentrations using ZnW12 as photocatalyst

Fig.9 Degradation rate of methyl orange in 0.5 mol/L H2SO4/Na2SO4 buffer solution with different pH value

Fig.10 Repeatability of photocatalytic degradation of methyl orange by ZnW12 Note:a. No. 1; b. No. 2; c. No. 3.

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Photocatalytic Activity of Keggin Type Polyoxometalates XW₁₂ $O 40 n -$ (X=P⁵⁺, Si⁴⁺, B³⁺, Zn²⁺) Toward Degradation of Methyl Orange^†

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