A one-dimensional covalent organic framework for dual-mode sensing and photocatalytic recovery of gold ions from electronic waste

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2026-05-15 Epub Date: 2026-02-16 DOI:10.1016/j.snb.2026.139649

Si-Meng Chen , Zhen-Wen Zhang , Sai-Jin Xiao , Ru-Ping Liang , Li Zhang , Jian-Ding Qiu

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Abstract

The detection and recovery of gold from electronic waste (e-waste) are crucial for environmental protection and resource sustainability. Herein, we report the synthesis of a novel one-dimensional (1D) fluorescent covalent organic framework (DABI-COF) from 1,3,6,8-tetra(4-formylphenyl)pyrene (TFPPy) and 5,6-diaminobenzimidazol-2-one (DABI) for dual-mode detection and photocatalytic recovery of gold from e-waste. DABI-COF with abundant recognition sites enables rapid and specific responses to gold ions, with fluorescence quenching via a photoinduced electron transfer mechanism and a visible color change from bright yellow to dark green, achieving fluorescent and colorimetric sensing with a low detection limit of 13.33 nM. Furthermore, under visible light irradiation, DABI-COF demonstrates exceptional photocatalytic recovery of gold with shorter equilibration time (10 min) and higher adsorption capacity (up to 3906.5 mg g⁻¹) than those in the dark condition. Practical applications in real e-waste leachate confirm its excellent selectivity and high efficiency (> 90 %) for gold recovery. This work highlights the great potential of 1D COFs in the dual-functional detection and photocatalytic recovery of precious metals from e-waste.

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用于电子废弃物中金离子双模传感和光催化回收的一维共价有机框架

从电子废物中检测和回收黄金对环境保护和资源可持续性至关重要。本文报道了以1,3,6,8-四（4-甲苯基）芘（TFPPy）和5,6-二氨基苯并咪唑-2-酮（DABI）为原料合成的新型一维（1D）荧光共价有机骨架（DABI- cof），用于电子垃圾中金的双模检测和光催化回收。DABI-COF具有丰富的识别位点，对金离子具有快速特异的响应能力，荧光通过光致电子转移机制猝灭，可见颜色由亮黄色变为深绿色，实现荧光和比色传感，检出限低为13.33 nM。此外，在可见光照射下，DABI-COF表现出优异的光催化回收金的能力，其平衡时间（10 min）和吸附容量（高达3906.5 mg g−1）都比在黑暗条件下更短。在实际电子垃圾渗滤液中的应用表明，该方法对金的选择性好，回收率高（> 90 %）。这项工作突出了1D COFs在电子废物中贵金属双功能检测和光催化回收方面的巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.