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Abstract
Gellan gum is one of the water-soluble anionic polysaccharides produced by the bacteria Sphingomonas elodea. In this study, we prepared gellan gum-inorganic composite films by mixing the gellan gum and a silane coupling reagent—3-glycidoxypropyltrimethoxysilane (GPTMS). These gellan gum-GPTMS composite films were stable in an aqueous solution and showed a thermal stability. In addition, these composite films indicated a mechanical strength by the formation of the three-dimensional network of siloxane. We demonstrated the accumulation of metal ions from a metal ion-containing aqueous solution by the composite film. As a result, although the composite film indicated the accumulation of heavy and rare-earth metal ions, the light metal ions, such as Mg(II) and Al(III) ions, did not interact with the composite material. Therefore, the accumulative mechanism of metal ions using a composite film was evaluated by IR measurements. As a consequence, although the accumulation of heavy and rare-earth metal ions occurred at both the −COO− group and the −OH group in the gellan gum, the accumulation of light metal ions occurred only at the −OH group.
Highlights
Composite Film and Its Metal IonGellan gum is one of the water-soluble anionic polysaccharides produced by the bacteria Sphingomonas elodea
The accumulation of metal ions by the gellan gum-GPTMS composite film was demonstrated as follows: one gellan gumGPTMS composite film was added to each metal ion-containing aqueous solution, the solutions were stirred at RT for 6 h, the composite films were separated from the aqueous solutions
The color of the dried gellan gum-GPTMS composite film changed from transparent to blue. These results suggested that the gellan gum-GPTMS composite film can accumulate metal ions from a metal ion-containing aqueous solution
Summary
Gellan gum is one of the water-soluble anionic polysaccharides produced by the bacteria Sphingomonas elodea. Organic-inorganic composite materials [10,11,12,13] have attracted much attention as functional materials with a thermal stability, mechanical strength, and stabilization of unstable chemical compounds, etc. Since these organic-inorganic composite materials possess both the properties of organic and inorganic components, these materials indicate a Accumulation Property. Organic-inorganic composite materials [10,11,12,13] have attracted much attention as functional materials with a thermal stability, mechanical strength, and stabilization of un of 13 stable chemical compounds, etc.
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