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A new approach to biomining: Bioengineering surfaces for metal recovery from aqueous solutions

机译：生物元线的一种新方法：水溶液中金属回收的生物工程表面

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Electronics waste production has been fueled by economic growth and the demand for faster, more efficient consumer electronics. The glass and metals in end-of-life electronics components can be reused or recycled; however, conventional extraction methods rely on energy-intensive processes that are inefficient when applied to recycling e-waste that contains mixed materials and small amounts of metals. To make e-waste recycling economically viable and competitive with obtaining raw materials, recovery methods that lower the cost of metal reclamation and minimize environmental impact need to be developed. Microbial surface adsorption can aid in metal recovery with lower costs and energy requirements than traditional metal-extraction approaches. We introduce a novel method for metal recovery by utilizing metal-binding peptides to functionalize fungal mycelia and enhance metal recovery from aqueous solutions such as those found in bioremediation or biomining processes. Using copper-binding as a proof-of-concept, we compared binding parameters between natural motifs and those derived in silico, and found comparable binding affinity and specificity for Cu. We then combined metal-binding peptides with chitin-binding domains to functionalize a mycelium-based filter to enhance metal recovery from a Cu-rich solution. This finding suggests that engineered peptides could be used to functionalize biological surfaces to recover metals of economic interest and allow for metal recovery from metal-rich effluent with a low environmental footprint, at ambient temperatures, and under circumneutral pH.
机译：电子废物生产已被经济增长和对更快，更有效的消费电子产品的需求推动。可以重复使用或再循环寿命结束电子元件中的玻璃和金属;然而，常规的提取方法依赖于能量 - 密集型过程，当施加到含有混合材料和少量金属的回收的电子废物时效率低下。为了使电子废物再循环经济上可行和竞争力，获得原材料，恢复方法降低金属填海成本并最大限度地减少对环境的影响。微生物表面吸附可以有助于金属回收，而不是传统的金属提取方法的成本和能量要求。我们通过利用金属结合肽来介绍一种新的金属回收方法，以使真菌菌丝体官能化并增强来自水溶液的金属回收，例如生物化或生物化工程中的水溶液。使用铜结合作为概念验证，我们比较了天然基序和衍生在硅的那些之间的结合参数，并发现Cu的相当结合亲和力和特异性。然后，将金属结合肽与几丁质结合结构域组合以使基于菌丝菌丝的过滤器官能化以增强富含Cu的溶液中的金属回收。该发现表明，工程化肽可用于使生物表面能够回收经济兴趣的金属，并在环境温度下，在环境温度下，在环境温度下，允许金属回收金属富含金属的流出物。

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