Efficient and selective gold recovery from practical e-waste and electroplating wastewater using protein crystals

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2025-06-11 DOI:10.1016/j.resconrec.2025.108450

Xiao-Qian Jin, Jia-Lei Li, Chen-Yuan Li, Liang-Liang Chen, Xue-Ting Wang, Wen-Pu Shi, Jun-Bin Xiong, Rui Zhang, Wei-Hong Guo, Da-Chuan Yin

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引用次数: 0

Abstract

Gold recovery from wastes is becoming increasingly important in gold production. However, satisfactory recovery technologies are lacking. Here we show that protein (hemoglobin) crystals exhibit outstanding performance in gold recovery. We prepared crosslinked hemoglobin crystals (CLHCs) from discarded bovine blood. The CLHCs demonstrated combined advantages in gold recovery: high recovery efficiency (100 %), high selectivity (recovery efficiency 95.14 % for Au³⁺ versus 0 % for ions like Cu²⁺), ultra-trace gold recovery (residual Au³⁺ 0.19 ppb), rapid equilibrium (2 min), and low cost (25.25 CNY/kg). We tested their recovery performance on e-waste and electroplating wastewater, proving that they are indeed practically applicable. Mechanism studies have shown that the performance is attributed to the combined effects of the physical adsorption of Au³⁺ by the crystals and the chemical reduction of Au³⁺ by the amino acids. Our approach is a typical sustainable technology, as it utilizes waste (animal blood) to recycle waste (e-waste and electroplating wastewater).

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利用蛋白质晶体从实际电子废物和电镀废水中高效、选择性地回收金

从废物中回收黄金在黄金生产中变得越来越重要。然而，目前还缺乏令人满意的回收技术。在这里，我们发现蛋白质（血红蛋白）晶体在金的回收中表现出优异的性能。我们用废弃的牛血液制备了交联血红蛋白晶体（clhc）。clhc在金回收方面具有综合优势：高回收率（100%）、高选择性（对Au3+的回收率为95.14%，对Cu2+等离子的回收率为0%）、超痕量金回收（残余Au3+ 0.19 ppb）、快速平衡（2 min）和低成本（25.25元/公斤）。我们测试了它们对电子废物和电镀废水的回收性能，证明它们确实具有实际应用价值。机理研究表明，这种性能是晶体对Au3+的物理吸附和氨基酸对Au3+的化学还原共同作用的结果。我们的方法是一种典型的可持续技术，因为它利用废物（动物血液）来回收废物（电子废物和电镀废水）。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.