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离子液体型多金属氧酸盐[PyPS]nH3-nPW12O40·xH2O的合成及其对水溶液中染料的光催化脱色作用

李园园,杨春*   

  1. (江苏省生物功能材料重点实验室， 南京师范大学化学与材料科学学院 南京 210097)
  • 收稿日期:2012-04-13 修回日期:2012-06-29 出版日期:2013-03-10 发布日期:2013-03-10
  • 通讯作者: 杨春，教授; Tel:025-83598280; E-mail:yangchun@njnu.edu.cn; 研究方向：催化化学
  • 基金资助:
    江苏高校优势学科建设工程资助项目；南京师范大学“211工程”三期重点学科建设计划资助项目

Preparation of Ionic Liquid-like Polyoxometalates [PyPS]nH3-nPW12O40·xH2O and Their Photocatalytic Performances to Decoloration of Dyes in Aqueous Solution

LI Yuanyuan, YANG Chun*   

  1. (Jiangsu Key Laboratory of Biofunctional Materials,College of Chemistry and Material Science,
    Nanjing Normal University,Nanjing 210097,China)
  • Received:2012-04-13 Revised:2012-06-29 Published:2013-03-10 Online:2013-03-10
  • Contact: Chun Yang

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摘要： 以吡啶、丙磺酸内酯和钨磷酸为原料，合成了离子液体型多金属氧酸盐（POM-IL）化合物[PyPS]nH3-nPW12O40·xH2O（n=1，2，3），用FT-IR、UV-Vis、1H NMR和元素分析等对其进行了表征。 结果显示，POM-IL化合物仍保持相应钨磷酸的Keggin结构，并存在吡啶丙磺酸的特征谱带，熔点均高于130 ℃，且随有机阳离子含量增加，熔点降低。 在紫外光下，n为1和2的POM-IL对水溶液中甲基橙的光催化降解活性与钨磷酸相似；在可见光下，POM-IL对水溶液中靛红的光催化降解活性相近，且均远高于钨磷酸。

关键词: 离子液体, 多金属氧酸盐, 合成与表征, 光催化

Abstract: Ionic liquid-like polyoxometalates(POM-IL), [PyPS]nH3-nPW12O40·xH2O(n=1,2,3), were synthesized by using pyridine, 1,3-propanesultone and tungstophosphoric acid as raw materials. The compounds were characterized by means of FT-IR, UV-Vis, 1H NMR and elementary analyses. The results showed that Keggin structure of POM was kept and there were character bands of pyridyl propylsulfonic acid in the POM-IL salts. All prepared compounds possess melting-points above 130 ℃ and the melting-points decreased with the increase of the organic component. Furthermore, the photocatalytic performances of these POM-IL samples for the degradation of aqueous dyes were investigated. Under UV irradiation, the samples with n=1 and 2 showed similar photocatalytic activities to that of tungstophosphoric acid for the degradation of methyl orange. Under visible light, all POM-IL salts exhibit the same photocatlytic activities which are superior to tungstophosphoric acid for the degradation of isatin. Therefore, all these POM-IL salts might be promising photocatalysts for the degradation of some dyes under visible light.

Key words: Ionic liquid, Polyoxometalates, Synthesis and characterization, Photocatalysis

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