| EFFECTS OF COMPOSITION AND STRUCTURE OF ALGINATES ON ADSORPTION OF DIVALENT METALS |
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| 作者姓名： | 郑乃余 张燕霞 范晓 韩丽君 |
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| 作者单位： | Institute of Oceanology. Chinese Academy of Sciences，Qingdao 266071 |
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| 基金项目： | Contribution No. 2166 from the Institute of Oceanology, Chinese Academy of Sciences |
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| 摘 要： | Results of a series of experiments(on the adsorption of divalent metal ions by dried alginic acid, Na and Ca alginates of different composition and block structure) conducted in this systematic study of the effects of the composition and structure of alginates on the static adsorption equilibrium of divalent metal ions indicate that the properties of alginate adsorption to divalent metal ions are highly different, depending not only on the cations used, but also on the form and structure of the alginates. There is close correlation between the adsorption properties and the structure of the alginates. The selectivity coefficient of Na alginate for Cd-Sr ion exchange tends to increase with the increase of the M/G ratio in alginate, whereas the adsorption capacity of Ca alginate for Cu~(2+) ion decrease with the increase of the G-block or the average length of the G-block ((?)_G) and the total adsorption capacity of alginic acid is found to vary in the same order as the F_(MM)(diad frequency) in alginate in
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EFFECTS OF COMPOSITION AND STRUCTURE OF ALGTNATES ON ADSORPTION OF DIVALENT METALS |
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| ZHENG Nai-yu,ZHANG Yan-xia,FAN Xiaoand HAN Li-jun.EFFECTS OF COMPOSITION AND STRUCTURE OF ALGINATES ON ADSORPTION OF DIVALENT METALS[J].Chinese Journal of Oceanology and Limnology,1994(1). |
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| Authors: | ZHENG Nai-yu ZHANG Yan-xia FAN Xiaoand HAN Li-jun |
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| Abstract: | Results of a series of experiments(on the adsorption of divalent metal ions by dried alginic acid, Na and Ca alginates of different composition and block structure) conducted in this systematic study of the effects of the composition and structure of alginates on the static adsorption equilibrium of divalent metal ions indicate that the properties of alginate adsorption to divalent metal ions are highly different, depending not only on the cations used, but also on the form and structure of the alginates. There is close correlation between the adsorption properties and the structure of the alginates. The selectivity coefficient of Na alginate for Cd-Sr ion exchange tends to increase with the increase of the M/G ratio in alginate, whereas the adsorption capacity of Ca alginate for Cu2+ ion decrease with the increase of the G-block or the average length of the G-block (NG) and the total adsorption capacity of alginic acid is found to vary in the same order as the FMM(diad frequency) in alginate in the mixed solution of Sr2+, Ba2+ and Cd2+. |
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| Keywords: | composition structure adsorption ion exchange divalent metal alginate seaweed |
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