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Citation: DENG Ling-Juan, YANG Chun. Synthesis of Sn~Ⅱ-Substituted Keggin-type Polyoxometalates and Their Photocatalytic Performance[J]. Chinese Journal of Applied Chemistry, ;2007, 24(2): 139-143. shu

Synthesis of Sn~Ⅱ-Substituted Keggin-type Polyoxometalates and Their Photocatalytic Performance

DENG Ling-Juan ,
YANG Chun ^,

1.
College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097

Corresponding author: YANG Chun,
Received Date: 8 March 2006
Available Online: 16 June 2006
Fund Project: 国家自然科学基金(20473037) (20473037)江苏省教育厅自然科学基金(04KJB150069) (04KJB150069)国家人事部留学人员科技活动基金(2005103SB9BH51)资助项目 (2005103SB9BH51)

The Sn^Ⅱ-substituted Keggin-type tungstophosphate and tungstosilicate were synthesized.The samples were characterized by means of IR,UV-Vis spectroscopy and ³¹P NMR measurement.It is shown that the synthesized compounds are pure Sn^Ⅱ-substituted polyoxometalates,and no Sn^Ⅳ-substituted species are included.No Sn²⁺ enters the central position of vacant octahedron in the lacunary structure,thus the symme-try of the polyoxoanion lies between the saturated and the lacunary structures.Furthermore,the photocatalytic activities of these polyoxometalates for the degradation of aqueous dye were also investigated.It is demons-trated that the Sn^Ⅱ-substituted compounds are of high photocatalytic activities,which are higher than those of often employed PW₁₂ and SiW₁₂ compounds.The Sn^Ⅱ-substituted tungstosilicate even showed a high photo-catalytic activity for methyl orange and methylene blue under the scattered sunlight.The degradation percen-tages of these dyes are over 90% after a reaction progress for 7 h.Study on photocatalytic mechanism shows that no high energy for O→W charge transfer is needed for Sn^Ⅱ-substituted polyoxometalates.The radiation of lower energy can excite the electrons at HOMO level and ignite the photocatalytic reaction.Therefore Sn^Ⅱ-substituted polyoxometalates can greatly increase the utilization of light energy.
- polyoxometalate,
- Keggin structure,
- Sn^Ⅱ-substitution,
- photocatalysis,
- degradation of dye
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