Based on the in-situ self-reduction and chemical stability, graphdiyne (GDY) and graphdiyne oxide (GDYO) are used as trapping agents to investigate the ability for recovering Au³⁺, Ag⁺, and Pd²⁺ under different pH values and interfering ions. Under strong acidity at pH = 1, these two agents demonstrate high select recovery towards the three precious metal ions, which could be in-situ reduced to nanoparticles (NPs). In addition, superparamagnetic Fe₃O₄ NPs are deposited on the surfaces of GDY and GDYO. The magnetic responses enable GDY-Fe₃O₄ to recover precious metals conveniently and efficiently by the aid of an external magnetic field. This study also confirms the antibacterial activity of the as-recovered NPs deposited on GDY and GDYO against Escherichia coli and Staphylococcus aureus (1 × 10⁵ colony-forming unit (CFU)·ml⁻¹), and the antibacterial rates are 100%. This strategy of recovering precious metals and subsequently reusing to combat pathogens will be of great significance for environmental remediation and biomedical applications.

Graphical abstract

中文翻译：

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石墨二炔和氧化石墨二炔回收和原位还原贵金属用于抗菌用途

基于原位自还原和化学稳定性，采用石墨二炔（GDY）和氧化石墨二炔（GDYO）作为捕集剂，研究了不同pH值和条件下回收Au ³⁺、Ag ⁺和Pd ²⁺的能力。干扰离子。在 pH = 1 的强酸性下，这两种试剂对三种贵金属离子表现出高选择回收率，可以原位还原为纳米颗粒 (NP)。此外，超顺磁性Fe ₃ O ₄ NPs沉积在GDY和GDYO的表面上。磁响应使得GDY-Fe ₃ O ₄能够借助外部磁场方便、高效地回收贵金属。本研究还证实了沉积在GDY和GDYO上的回收纳米粒子对大肠杆菌和金黄色葡萄球菌（1×10 ⁵菌落形成单位（CFU）·ml ^-1）的抗菌活性，抗菌率为100%。这种回收贵金属并随后再利用来对抗病原体的策略对于环境修复和生物医学应用具有重要意义。

图形概要