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首页> 外文期刊>Separation and Purification Technology >Gold recovery from parts-per-trillion-level aqueous solutions by a nanostructured Mn_2O_3 adsorbent
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Gold recovery from parts-per-trillion-level aqueous solutions by a nanostructured Mn_2O_3 adsorbent

机译：纳米结构的Mn_2O_3吸附剂从万亿分之几的水溶液中回收金

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摘要

We introduce a nanostructured Mn_2O_3-based adsorbent and a low-cost method that is capable of extracting gold,in the form of metallic nano-to-micrometer-size particles,from down to sub-ppm-level aqueous solutions including seawaters with high yield,good selectivity and recyclability,and environmental benignity.The Mn_2O_3 adsorbent,prepared by low-temperature synthesis followed by acid treatments,exhibits a mass-fractal-like morphology of agglomerated nanometer-size crystallite grains covered with active protonated sites and a surface area of about 120 m~2/g.For aqueous solutions containing approx100 ppm gold,a yield of 70 mg of gold/g of adsorbent was achieved.A Langmuir-type adsorption isotherm was observed,showing a rapid uptake of gold.The method is well suited to gold recovery from very dilute solutions.For example,over 95% of the gold was recovered from seawater samples containing 0.1 and 1 ppm of added gold.A pilot study of seawater with 1 ppt added gold showed similar results.The protonation-suspension-filtration-washing process can be recycled without noticeable degradation in yield.
机译：我们介绍了一种纳米结构的Mn_2O_3基吸附剂和一种低成本方法，该方法能够以金属纳米级至微米级颗粒的形式从低至亚ppm级的水溶液（包括海水中）提取金Mn_2O_3吸附剂经低温合成后再进行酸处理，具有块状分形的形貌，其表面覆盖有活性质子化位点，表面具有良好的选择性，可回收性和环境友好性。大约120 m〜2 / g。对于含金量约为100 ppm的水溶液，可达到70 mg / g吸附剂的金产量。观察到Langmuir型吸附等温线，表明金的快速吸收。例如，从含0.1和1 ppm添加金的海水样品中回收了95％以上的金。对添加1 ppt添加金的海水进行的中试研究显示了相似的结果。质子-悬浮-过滤-洗涤过程可以循环使用，而收率没有明显下降。

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