High-efficiency gold recovery by additive-induced supramolecular polymerization of β-cyclodextrin.
High-efficiency gold recovery by additive-induced supramolecular polymerization of β-cyclodextrin.
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DOI：
10.1038/s41467-023-36591-0
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发表时间：
2023-03-09
影响因子：
16.6
通讯作者：
Stoddart, J. Fraser
中科院分区：
文献类型：
--
作者：
Wu, Huang;Wang, Yu;Tang, Chun;Jones, Leighton O.;Song, Bo;Chen, Xiao-Yang;Zhang, Long;Wu, Yong;Stern, Charlotte L.;Schatz, George C.;Liu, Wenqi;Stoddart, J. Fraser
开发一种生态友好、高效、高选择性的金回收技术，是维护环境可持续发展和提高资源利用率的迫切需要。本文报道了一种基于精确控制β-环糊精和四溴酸盐阴离子之间形成的第二球配位加合物的互反转化和瞬时组装的加合物诱导金回收范式。添加剂通过与四溴酸阴离子共同占据β-环糊精的结合腔，启动了快速组装过程，导致形成超分子聚合物，从水溶液中析出共晶。以二丁醇为添加剂，金的回收率可达99.8%。这种共结晶对方形平面四溴酸盐阴离子具有高度选择性。在一项实验室规模的金回收方案中，在低至9.3 ppm的金浓度下，电子废物中94%以上的金被回收。这个简单的协议为黄金的可持续回收提供了一个有希望的范例，其特点是减少能源消耗，低成本投入，避免环境污染。为了满足日益增长的黄金需求，迫切需要环保、高效、选择性的黄金回收技术。在这里，作者报告了一种基于β-环糊精和四溴酸盐阴离子之间形成的第二球配位加合物的超分子聚合技术。
Developing an eco-friendly, efficient, and highly selective gold-recovery technology is urgently needed in order to maintain sustainable environments and improve the utilization of resources. Here we report an additive-induced gold recovery paradigm based on precisely controlling the reciprocal transformation and instantaneous assembly of the second-sphere coordinated adducts formed between β-cyclodextrin and tetrabromoaurate anions. The additives initiate a rapid assembly process by co-occupying the binding cavity of β-cyclodextrin along with the tetrabromoaurate anions, leading to the formation of supramolecular polymers that precipitate from aqueous solutions as cocrystals. The efficiency of gold recovery reaches 99.8% when dibutyl carbitol is deployed as the additive. This cocrystallization is highly selective for square-planar tetrabromoaurate anions. In a laboratory-scale gold-recovery protocol, over 94% of gold in electronic waste was recovered at gold concentrations as low as 9.3 ppm. This simple protocol constitutes a promising paradigm for the sustainable recovery of gold, featuring reduced energy consumption, low cost inputs, and the avoidance of environmental pollution. Eco-friendly, efficient, and selective gold recovery technologies are urgently desired to satisfy the increasing demand for gold. Here, the authors report one such technology based on the supramolecular polymerization of second-sphere coordinated adducts formed between β-cyclodextrin and tetrabromoaurate anions.
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