Anion induced gelation in polyvinyl alcohol: a probe for metal ion speciation studies

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• 作者：Pallabi Samaddar (1)
  Kamalika Sen (1)
  
  1. Department of Chemistry ; University of Calcutta ; 92 APC Road ; Kolkata ; 700009 ; India
  
• 关键词：Hydrogel ; Rheology ; Adsorption ; Isotherm ; Speciation
• 刊名：Journal of Sol-Gel Science and Technology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：73
• 期：2
• 页码：389-395
• 全文大小：1,059 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Ceramics,Glass,Composites,Natural Materials
  Inorganic Chemistry
  Optical and Electronic Materials
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1573-4846

文摘

Salt solutions of certain anions viz., sulphate, phosphate and citrate are reported herein to form hydrogels in PVA solutions for the first time. Hydrogels in sulphate medium have very high viscoelastic property and higher porosity than the phosphate or citrate hydrogels as can be seen from the SEM images. An attempt to find a chemical application of these gels in the field of elemental speciation reveals that smaller cations have lesser tendency to get adsorbed on the hydrogel surface. Fe(II), Fe(III), Mn(II) have either very less or no adsorption possibility. Mn(VII) undergoes species transformation to Mn(II) in the hydrogel and shows similar behavior as Mn(II) itself. Cr(III) has a certain adsorption in the sulphate hydrogel owing to some specific interactions. Cr(VI) remains in its anionic form and hence is not adsorbed. Fe(II) and Fe(III) however can be adsorbed upon suitable complexation in the hydrogel. Phosphate hydrogel serves as the better adsorber in these two cases. All the adsorptions follow Freundlich isotherm very nicely. The hydrogels are thus eligible probes for species dependent metal adsorption studies.