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首页> 外文期刊>Environmental Science & Technology >Polyethylenimine-Modified Fungal Biomass as a High-Capacity Biosorbent for Cr(VI)Anions:Sorption Capacity and Uptake Mechanisms
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Polyethylenimine-Modified Fungal Biomass as a High-Capacity Biosorbent for Cr(VI)Anions:Sorption Capacity and Uptake Mechanisms

机译：聚乙烯亚胺修饰的真菌生物质作为六价铬阴离子的高容量生物吸附剂：吸附能力和吸收机理

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摘要

Heavy metal pollution in the aqueous environment is a problem of global concern.Biosorption has been considered as a promising technology for the removal of low levels of toxic metals from industrial effluents and natural waters.A modified fungal biomass of Penicillium chrysogenum with positive surface charges was prepared by grafting polyethylenimine(PEI)onto the biomass surface in a two-step reaction.The presence of PEI on the biomass surface was verified by FTIR and X-ray photoelectron spectroscopy(XPS)analyses.Due to the high density of amine groups in the long chains of PEI molecules on the surface,the modified biomass was found to possess positive zeta potential at pH below 10.4 as well as high sorption capacity for anionic Cr(VI).Using the Langmuir adsorption isotherm,the maximum sorption capacity for Cr(VI)at a pH range of 4.3-5.5 was 5.37 mmol/g of biomass dry weight,the highest sorption capacity for Cr(VI)compared to other sorbents reported in the literature.Scanning electronic microscopy(SEM)provided evidence of chromium aggregates formed on the biomass surface.XPS results verified the presence of Cr(lll)on the biomass surface in the pH range 2.5-10.5,suggesting that some Cr(VI)anions were reduced to Cr(lll)during the sorption.The sorption kinetics indicated that redox reaction occurred on the biomass surface,and whether the converted Cr(lll)ions were released to solution or adsorbed on the biomass depended on the solution pH.Sorption mechanisms including electrostatic interaction,chelation,and precipitation were found to be involved in the complex sorption of chromium on the PEI-modified biomass.
机译：水环境中的重金属污染已成为全球关注的问题。生物吸附技术被认为是一种从工业废水和天然水中去除低含量有毒金属的有前途的技术。改性的黄青霉菌真菌生物质具有表面正电荷通过两步反应将聚乙烯亚胺（PEI）接枝到生物质表面上制备了PEI，并通过FTIR和X射线光电子能谱（XPS）分析验证了PEI在生物质表面上的存在。表面上的PEI分子长链，改性后的生物质在pH值低于10.4时具有正的Zeta电位以及对阴离子Cr（VI）的高吸附能力。使用Langmuir吸附等温线，对Cr（VI）的最大吸附能力VI）在4.3-5.5的pH范围内为5.37 mmol / g生物质干重，与文献中报道的其他吸附剂相比，对Cr（VI）的吸附能力最高。 ic显微镜（SEM）提供了在生物质表面上形成铬聚集体的证据。XPS结果验证了pH范围为2.5-10.5时生物质表面上存在Cr（III），这表明某些Cr（VI）阴离子被还原为Cr吸附动力学表明，氧化还原反应发生在生物质表面，转化的Cr（III）离子是释放到溶液中还是吸附在生物质上取决于溶液的pH值。吸附机理包括静电相互作用，发现螯合和沉淀与PEI改性生物质上铬的复杂吸附有关。

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  • 来源
    《Environmental Science & Technology》 |2005年第21期|p.8490-8496|共7页
  • 作者

    SHUBO DENG; YEN PENG TING;

  • 作者单位

    Department of Environmental Science and Engineering,Tsinghua University,Beijing,P.R.China 100084,and Department of Chemical and Biomolecular Engineering,National University of Singapore,10 Kent Ridge Crescent,Singapore 119260;

    Department of Environmental Science and Engineering,Tsinghua University,Beijing,P.R.China 100084,and Department of Chemical and Biomolecular Engineering,National University of Singapore,10 Kent Ridge Crescent,Singapore 119260;

  • 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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