高级检索

    一维共价有机框架在电子废弃物金回收中的应用进展

    Recent Advances in One-Dimensional Covalent Organic Frameworks for Gold Recovery from Electronic Waste

    • 摘要: 电子废弃物富含金等贵金属资源,是重要的“城市矿山”,其浸出液体系中Au(Ⅲ)以AuCl4形式存在,且为强酸、高盐和多金属共存。因此,如何实现Au(Ⅲ)选择性识别、高效捕获与原位还原,是金资源化回收面临的关键问题。共价有机框架(Covalent organic frameworks, COFs)因孔道有序、结构可设计和功能位点可调等特点,在贵金属回收领域受到广泛关注。其中,一维(One-dimensional, 1D)COFs具有活性位点暴露度高、传质阻力低、链间作用可调和定向电子传输等优势,为AuCl4快速富集与绿色还原提供了新的材料平台。本文综述1D COFs用于电子废弃物金回收的研究进展,重点总结位点识别/电荷调控、光辅助与光热辅助还原等策略,阐明功能位点、链间氢键、质子化作用、光生电子和光热效应对AuCl4吸附、还原行为的影响机制,并在活性位点精准构筑、复杂浸出液适应性、循环稳定性、连续化放大和回收金高值化利用等方面的发展方向进行展望,为1D COFs用于低成本、高选择性和可持续贵金属回收提供参考。

       

      Abstract: The efficient recovery of gold from electronic waste is of paramount significance, as such waste constitutes a valuable “urban mine” rich in precious metal resources, particularly gold. In the leaching liquor systems derived from e-waste, Au(Ⅲ) predominantly exists as AuCl4, amidst strongly acidic, high-salinity, and multi-metal coexisting conditions. Therefore, the critical challenge in the resource-oriented recovery of gold lies in achieving its selective recognition, efficient capture, and in-situ reduction from such complex matrices. Covalent organic frameworks (COFs) have attracted increasing attention in precious metal recovery, owing to their ordered pores, designable structures, and tunable functional sites. In particular, one-dimensional COFs (1D COFs) offer unique characteristics, including high exposure of active sites, low mass-transfer resistance, adjustable interchain interactions and directional electron transport, thereby providing a novel materials platform for the rapid enrichment and green reduction of AuCl4. This review summarizes recent progress in 1D COFs for gold recovery from electronic waste, focusing on strategies such as site-specific recognition, charge regulation, and photo- and photothermal-assisted reduction. The underlying mechanisms governing the adsorption and reduction behaviors of AuCl4 are elucidated, with emphasis on the roles of functional sites, interchain hydrogen bonding, protonation, photogenerated electrons, and photothermal effects. Finally, future perspectives are discussed, including the precise active-site construction, adaptability to complex leachates, cycling stability, continuous scaled-up recovery, and high-value utilization of recovered gold. This review is intended to engender interest in the development of low-cost, highly selective, and sustainable precious metal recovery using 1D COFs.

       

    /

    返回文章
    返回