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首页> 外文期刊>Environmental Science & Technology >Contribution of Sulfonate Groups and Alginate to Heavy Metal Biosorption by the Dry Biomass of Sargassum fluitans
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Contribution of Sulfonate Groups and Alginate to Heavy Metal Biosorption by the Dry Biomass of Sargassum fluitans

机译：绒毛海藻的干生物质对磺酸根和藻酸根对重金属生物吸附的贡献

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摘要

The mechanism of heavy metal complexation by the dry biomass of the brown seaweed Sargassum fluitans was investigated at the molecular level using different techniques. Simultaneous potentiometric and conductimetric titrations gave some information concerning the amount of strong and weak acidic functional groups in the biomass (0.25 ± 0.05 mequiv/g and 2.00 ± 0.05 mequiv/g, respectively). Those results were confirmed by the chemical identification of sulfonate groups (0.27 mequiv/g ± 0.03) and alginate (45% of the dry weight) corresponding to 2.25 mmol of carboxyl groups/g of biomass. Modification of these functional groups by methanolic hydrochloride or propylene oxide demonstrated the predominant role of alginate in the uptake of cadmium and lead. However, sulfonate groups can also contribute, to a lower extent, to heavy metal binding, particularly at low pH. Eventually, FTIR spectrophotometry on protonated or cadmium-loaded alginate and S. fluitans biomass physically demonstrated that cadmium binding arises by bridging or bidentate complex formation with the carboxyl groups of the alginate.
机译：使用不同的技术，在分子水平上研究了褐藻海藻（Sargassum fluitans）的干燥生物质与重金属络合的机理。同时进行电位滴定和电导滴定可提供有关生物质中强酸性官能团和弱酸性官能团数量的信息（分别为0.25±0.05 mequiv / g和2.00±0.05 mequiv / g）。这些结果已通过化学鉴定磺酸根基团（0.27 mequiv / g±0.03）和藻酸盐（干重的45％）进行了化学鉴定，相当于每克生物质2.25 mmol羧基。这些功能性基团被甲醇盐酸盐或环氧丙烷改性表明，藻酸盐在吸收镉和铅中起主要作用。然而，磺酸根基团也可以在较低程度上促进重金属结合，特别是在低pH值下。最终，通过FTIR分光光度法对质子化或负载镉的藻酸盐和S. fluitans生物量进行物理证明，镉结合是通过与藻酸盐的羧基桥接或形成二齿络合物而产生的。

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  • 来源
    《Environmental Science & Technology》 |1996年第1期|p.277-282|共6页
  • 作者

    ERIC FOUREST; BOHUMIL VOLESKY;

  • 作者单位

    Department of Chemical Engineering, McGill University, 3480 University Street, Montreal, Quebec, Canada H3A 2A7;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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