Highly selective and straightforward recovery of gold and platinum from acidic waste effluents using cellulose-based bio-adsorbent
Highly selective and straightforward recovery of gold and platinum from acidic waste effluents using cellulose-based bio-adsorbent
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DOI：
10.1016/j.jhazmat.2020.124569
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发表时间：
2021-03-26
影响因子：
13.6
通讯作者：
Hasegawa, Hiroshi
中科院分区：
文献类型：
--
作者：
Biswas, Foni B.;Rahman, Ismail M. M.;Hasegawa, Hiroshi
由于环境问题和供需比例的不平衡，从废弃资源中回收贵金属（pm: AuIII和PtIV）具有很高的重要性。利用早期开发的生物吸附剂二硫代氨基甲酸酯改性纤维素（DMC），探索了一种回收PM的新方法。该吸附剂在较宽的pH (1？6)对酸性溶液（[H+]: ?）中AuIII和PtIV的萃取选择性高。0.2 mol L?1)。吸附量（mmol g?1, AuIII: 5.07, PtIV: 2.41）和达到平衡速率(？30 min)显著高于大多数已报道的生物吸附剂。在DMC中捕获的AuIII或PtIV随后通过焚烧回收为Au0和Pt0（收率99%）。使用含有AuIII和PtIV的真实废物样品在贱金属离子混合基质中验证了该方案，并观察了AuIII和PtIV的定量（-100%）和选择性提取。该技术比典型的吸附-解吸-还原方法更有效、更直接，因为它不使用有毒洗脱剂，也不添加任何还原剂来收集元素形式的pmms。
Recovery of precious metals (PMs: AuIII and PtIV) from waste resources is of high importance due to the environmental concern and imbalance in the supply-demand ratio. A new approach has been explored for the recovery of PM using earlier developed bio-adsorbent, dithiocarbamate-modified cellulose (DMC). The adsorbent exhibits excellent adsorption efficiency (-99%) over a wide range of pH ( 1?6) and high selectivity towards AuIII and PtIV extraction from acidic solutions ([H+]: ? 0.2 mol L?1). The adsorption capacity (mmol g?1; AuIII: 5.07, PtIV: 2.41) and rate to reach equilibrium (? 30 min) were significantly higher than most of the reported bioadsorbents. The AuIII or PtIV, after captured in DMC, was subsequently recovered as Au0 and Pt0 (yield 99%) via incineration. The protocol was verified using real waste samples containing AuIII and PtIV in a mixed matrix of base metal ions, and a quantitative (-100%) and selective extraction of AuIII and PtIV were observed. The proposed technique is more effective and straightforward than the typical adsorption-desorption-reduction based method, because of the advantages like no-use of toxic eluents, and no-addition of any reductants to collect the PMs in elemental form.