Dual-Crosslinking Polydopamine/Poly(imide dioxime) Porous Network Membrane Enables Efficient and Selective Gold Recovery from e-Waste

IF 7.4 Q1 ENGINEERING, ENVIRONMENTAL ACS ES&T engineering Pub Date : 2024-07-20 DOI:10.1021/acsestengg.4c0026310.1021/acsestengg.4c00263

Xueqin Zhang, Huaimeng Li*, Zhenzhen Liu, Zhen Fu, Haimin Zhang, Guozhong Wang and Yunxia Zhang*,

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Abstract

With the sharp increase in electronic and electrical equipment as well as concomitant electronic waste, it is imperative to recover precious metals from secondary resources from the perspective of environment protection and sustainable development. Herein, a free-standing, dual-cross-linking polydopamine (PDA) in conjunction with poly(imide dioxime) (PIDO) porous membrane (denoted as PDA/PIDO) is fabricated via a facile interfacial polymerization method for gold recovery. As expected, the constructed PDA/PIDO membrane features a hierarchical porous structure, ample active sites, and excellent hydrophilicity, endowing it with an ultrahigh gold capture capacity (3368 mg g^–1), fast equilibrium time (35 min), superior recovery selectivity (separation factor of Au/Cu = 5.4 × 10⁵, Au/Ni = 3.9 × 10⁵), high flux (1050 L m² h^–1), and high retention rate (98%). Furthermore, the proposed PDA/PIDO membrane is also competent for selective gold recovery from the central processing unit leachate with remarkable efficiency in a continuous-flowing filtration system, highlighting its huge potential in practical large-scale gold recovery from e-waste.

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双交联聚多巴胺/聚（亚胺二氧肟）多孔网络膜可从电子垃圾中高效、选择性地回收黄金

随着电子电气设备以及随之产生的电子废弃物的急剧增加，从环境保护和可持续发展的角度出发，从二次资源中回收贵金属势在必行。本文通过一种简便的界面聚合方法，制备了一种独立的双交联聚多巴胺（PDA）与聚（亚胺二氧肟）（PIDO）多孔膜（简称 PDA/PIDO），用于金的回收。正如预期的那样，所制备的 PDA/PIDO 膜具有分层多孔结构、充足的活性位点和优异的亲水性，因而具有超高的金捕获能力（3368 mg g-1）、快速的平衡时间（35 分钟）、优异的回收选择性（Au/Cu = 5.4 × 105，Au/Ni = 3.9 × 105）、高通量（1050 L m2 h-1）和高截留率（98%）。此外，所提出的 PDA/PIDO 膜还能在连续流动的过滤系统中从中央处理单元浸出液中选择性地回收金，且效率显著，这凸显了其在实际大规模回收电子垃圾中的巨大潜力。

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ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-

CiteScore

8.50

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0.00%

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期刊介绍： ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources. The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope. Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.