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首页> 外文期刊>Journal of Wood Chemistry and Technology >Removal of Hexavalent Chromium by Different Modified Spruce Bark Adsorbents
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Removal of Hexavalent Chromium by Different Modified Spruce Bark Adsorbents

机译：不同改性云杉树皮吸附剂去除六价铬

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摘要

In this work, spruce bark was used as a raw material to remove Cr(Ⅵ) ions from aqueous solutions. Three kinds of chemically modified bark adsorbents were prepared by treatment with formaldehyde (FB), dilute sulfuric acid (AB), and concentrated sulfuric acid (CB), respectively. The chemical modifications mainly changed the relative lignin content in the bark. Lower pH facilitated the adsorption of Cr(Ⅵ) ions because reduction of Cr(Ⅵ) ions to Cr(Ⅲ) ions occurred during the adsorption process which consumed a large amount of H~+ ions. Higher temperature accelerated the adsorption process, owing to the endothermic nature of the redox reaction. At initial solution pH around Ⅰ, the adsorption capacities of Cr(Ⅵ) ions on FB, AB, and CB were as high as 423, 503, and 759 mg/g, respectively, which were much higher than the reported adsorption capacities by other agricultural and forest biosorbents in the literatures. XPS analysis revealed the adsorption mechanism was adsorption-coupled reduction involving the electron-donor groups of lignin moieties.
机译：在这项工作中，使用云杉树皮作为原料从水溶液中去除Cr（Ⅵ）离子。分别用甲醛（FB），稀硫酸（AB）和浓硫酸（CB）处理，制备了三种化学改性的树皮吸附剂。化学修饰主要改变了树皮中相对木质素的含量。较低的pH值促进了Cr（Ⅵ）离子的吸附，因为在吸附过程中Cr（Ⅵ）还原为Cr（Ⅲ）离子，从而消耗了大量的H〜+离子。由于氧化还原反应的吸热性质，较高的温度加速了吸附过程。在初始溶液的pH值约为Ⅰ时，FB，AB和CB上的Cr（Ⅵ）离子吸附能力分别高达423、503和759 mg / g，远高于其他报道的吸附能力。文献中的农业和森林生物吸附剂。 XPS分析表明，吸附机理为吸附耦合还原，涉及木质素部分的电子给体基团。

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  • 来源
    《Journal of Wood Chemistry and Technology》 |2014年第4期|273-290|共18页
  • 作者

    SHA LIANG; XUEYI GUO; SILKE LAUTNER; BODO SAAKE;

  • 作者单位

    School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, P. R. China,School of Metallurgy and Environment, Central South University, Changsha, Hunan, P. R. China;

    School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, P.R. China;

    Department of Wood Science, University of Hamburg, Hamburg, Germany;

    Department of Wood Science, University of Hamburg, Hamburg, Germany;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Spruce bark; biosorption; Cr(Ⅵ); reduction;

    机译：云杉树皮;生物吸附六价铬减少;

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