期刊信息

  • 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
  • 主办： 河北师范大学
  • ISSN： 1000-5854
  • CN： 13-1061/N
  • 中国科技核心期刊
  • 中国期刊方阵入选期刊
  • 中国高校优秀科技期刊
  • 华北优秀期刊
  • 河北省优秀科技期刊

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Keggin型磷钼酸盐超分子配合物的合成及光催化还原Cr(Ⅵ)的应用

  • 河北师范大学 化学与材料科学学院, 河北省功能有机分子重点实验室, 国家实验化学教育示范中心, 河北 石家庄 050024
  • DOI： 10.13763/j.cnki.jhebnu.nse.202103009

Synthesis of Keggin Type Molybdophosphate Supramolecular Complex and Its Application in Photocatalytic Reduction of Cr(Ⅵ)

摘要/Abstract

摘要：

通过水热法合成了一例Keggin型磷钼酸盐超分子配合物，化学式为（H2bpe）（Hbpe）{PMo12O40}·6H2O（1）（bpe=反式-1，2-双（4-吡啶基）-乙烯）. 通过使用单晶X射线衍射、红外光谱、X射线粉末衍射、热重、循环伏安、固体可见漫反射光谱等测试手段对其结构、氧化还原性能以及光学活性进行了表征，并将其用于光催化还原Cr（Ⅵ）反应体系中. 结构分析表明，化合物1中的无机部分由离散的[PMo12O40]3-阴离子簇组成，该阴离子簇通过与有机抗衡阳离子之间的氢键作用连接形成三维超分子结构. 化合物1具有宽的可见光吸收和合适的能带结构，在光催化还原Cr（Ⅵ）反应中展现出良好的光催化活性. 在80min内，Cr（Ⅵ）还原转化率可达到72%.经过4次循环后，结构依然保持良好. 该工作为设计和制备高效的多酸基Cr（Ⅵ）光催化剂提供了新的方法.

Abstract：

In this work, a Keggin-type supramolecular complex with formula of (H2bpe)(Hbpe)[PMo12O40]·6H2O (1) (bpe=trans-1,2-bi(4-pyridyl)-ethylene) was hydrothermally synthesized and characterized by single crystal X-ray diffraction, infrared spectrum, powder X-ray diffraction,thermogravimetry TG, cyclic voltammetry,UV-vis diffuse-reflectance spectroscopy. Compound 1 was constructed by[PMo12O40]3- polyoxoanions and protonated bpe cations, and the hydrogen bonding interactions between them extended the whole structure into three-dimensional supramolecular structure. The UV-vis DRS spectrum demonstrated that compound 1 has wide absorption range towards visible-light and suitable energy band structure.When using as photocatalyst, compound 1 showed excellent photocatalytic performance towards the reduction of Cr(Ⅵ).The reduction rate of Cr (Ⅵ) can reach to 72% within 80min.After 4 cycles, the structure is still ingood condition.This work provides a newguidance for the design and preparation of highly efficient Cr(Ⅵ) photocatalysts based on polyoxometalates.

关键词

关键词： 多金属氧酸盐 ; 超分子配合物 ; 磷钼酸盐 ; 光催化 ; Cr(Ⅵ)还原
Key words： polyoxometalate ; supramolecular complexe ; phosphomolybdate ; photocatalysis ; Cr(Ⅵ) reduction

参考文献 21

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