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首页> 外文期刊>Marine Chemistry >Gold recovery from artificial seawater using synthetic materials and seaweed biomass to induce gold nanoparticles formation in batch and column experiments
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Gold recovery from artificial seawater using synthetic materials and seaweed biomass to induce gold nanoparticles formation in batch and column experiments

机译：使用合成材料和海藻生物质从人造海水中回收金，以在分批和色谱柱实验中诱导金纳米颗粒的形成

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摘要

Gold recovery from artificial seawater was studied in the present work. Two synthetic materials composed of silica gel joint to a strong chelating agent were used as reducing agents to induce gold colloid nanoparticle formation: ethylene diamine tetraacetic acid and diethylene triamine pentaacetic acid, together with brown seaweed Sargassum rmiticum. The mechanism and ideal conditions involving gold recovery from artificial seawater were investigated. The results showed that there is no pH effect within the range of 2-6. Moreover, the presence of other metals like Co, Ni, and Cr(Ⅵ) did not interfere the gold sorption/reduction reactions. Only thiourea showed significant regeneration percentages of the materials saturated with metallic gold. The absence of complete gold appearance in the effluent during column experiments could indicate that the sorption capacity of the materials was saturated, but not their reduction power. The shape of the obtained curves during the kinetic experiments revealed several stages occurring during the gold recovery from artificial seawater. Potentiometric titrations, FTIR, and SEM analysis provided decisive evidence supporting the proposed mechanism. A novel plausible three-step mechanism was suggested for the gold recovery from artificial seawater based on the experimental evidence. In a first stage, the adsorption of the anion species AuCU_4~- occurred. Following, the reduction of AuCl_4~- to Au(0), and the later oxidation of the metallic gold formed to the unstable AuCl_2~- arose. Finally, during the last stage metallic gold redissolution is not further favored, and probably only the reduction of the chloro-gold complexes to metallic gold occurred.
机译：在目前的工作中研究了从人造海水中回收金。两种由硅胶与强螯合剂连接的合成材料被用作还原剂以诱导金胶体纳米颗粒的形成：乙二胺四乙酸和二亚乙基三胺五乙酸，以及褐藻海藻Sargassum rmiticum。研究了从人工海水中回收金的机理和理想条件。结果表明，在2-6范围内没有pH值影响。此外，其他金属如Co，Ni和Cr（Ⅵ）的存在不会干扰金的吸附/还原反应。只有硫脲显示出被金属金饱和的材料的显着再生百分比。在柱实验过程中，流出液中没有完整的金外观可能表明该材料的吸附能力达到了饱和，但还原能力并未达到饱和。在动力学实验中获得的曲线的形状揭示了从人造海水中回收金的过程中发生了几个阶段。电位滴定，FTIR和SEM分析提供了支持拟议机制的决定性证据。根据实验证据，提出了一种新颖的可行的三步机制，用于从人造海水中回收金。在第一阶段，发生阴离子种类AuCU_4-的吸附。随后，AuCl_4〜-还原为Au（0），随后金属金氧化形成不稳定的AuCl_2〜-。最后，在最后阶段，金属金的再溶解不再受到青睐，可能仅发生了氯金配合物向金属金的还原。

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  • 来源
    《Marine Chemistry》 |2013年第20期|11-19|共9页
  • 作者

    Pablo Lodeiro; Mika Sillanpaa;

  • 作者单位

    Department of Physical Chemistry and Chemical Engineering I, University of A Coruna, Rua da Fraga 10, 15008 A Coruna, Spain;

    Laboratory of Green Chemistry, Department of Energy and Environmental Technology, Faculty of Technology, Lappeenranta University of Technology, Finland;

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

    Precious metal; Sargassum muticum; EDTA; DTPA; Silica gel; Nanoparticle;

    机译：贵金属羊栖菜EDTA;DTPA;硅胶;纳米粒子;

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