College of Resources and Environmental Science, Quanzhou Normal University, 398 Donghai Road, Quanzhou, 362000, China; Guangdong Provincial Engineering Research Center of Intelligent Low-carbon Pollution Prevention and Digital Technology, South China Normal University, Guangzhou, 510006, China; SCNU (NAN'AN) Green and Low-carbon Innovation Center, Nan'an SCNU Institute of Green and Low-carbon Research, Quanzhou, 362300, China.
College of Resources and Environmental Science, Quanzhou Normal University, 398 Donghai Road, Quanzhou, 362000, China.
J Environ Manage. 2024 Nov;370:122391. doi: 10.1016/j.jenvman.2024.122391. Epub 2024 Sep 7.
The recovery and upcycling of metals from electronic waste into functional materials for wastewater treatment is a win-win strategy for simultaneously realizing electronic waste recycling and wastewater purification. This study focused on converting Cu from waste printed boards (PCBs), a common Cu-rich electronic waste, into CuFeO supported on a mesoporous carbon framework (PCFT) with the assistance of Fe and tannic acid (TA). Compared to the PCF prepared without TA, the resulting PCFT exhibited excellent magnetic properties, high crystallinity, lower interfacial transfer resistance, more abundant oxygen vacancies (O), and lower metal leaching. Moreover, PCFT can serve as a superior heterogeneous catalyst to activate peroxymonosulfate to remove reactive brilliant blue KN-R from wastewater, and its catalytic activity was markedly higher than that of CFT synthesized with Cu(NO)·3HO, which may be due to its higher specific surface area and more abundant O. The combined results of scavenging experiments, electron paramagnetic resonance analysis, and electrochemical measurements implied that both radical and nonradical processes promoted the elimination of KN-R; however, OH and SO were not the major contributors. Furthermore, the PCFT exhibited high adaptability to pH and water matrices, confirming its practical application potential. These findings provide a novel strategy for the upcycling of metals from electronic waste.
从电子废物中回收和升级金属，将其转化为用于废水处理的功能性材料，是一种双赢的策略，可同时实现电子废物回收和废水净化。本研究专注于将废印刷电路板（PCBs）中的 Cu（一种常见的富 Cu 电子废物）转化为负载在介孔碳骨架上的 CuFeO（PCFT），这一过程得到了 Fe 和单宁酸（TA）的辅助。与未添加 TA 制备的 PCF 相比，所得 PCFT 表现出优异的磁性、高结晶度、更低的界面转移电阻、更丰富的氧空位（O）和更低的金属浸出。此外，PCFT 可用作一种优异的非均相催化剂，以激活过一硫酸盐来去除废水中的活性艳蓝 KN-R，其催化活性明显高于用 Cu(NO)·3HO 合成的 CFT，这可能是由于其具有更高的比表面积和更丰富的 O。清除实验、电子顺磁共振分析和电化学测量的综合结果表明，两种自由基和非自由基过程都促进了 KN-R 的消除；然而，OH 和 SO 不是主要贡献者。此外，PCFT 对 pH 和水基质具有高适应性，证实了其实际应用潜力。这些发现为从电子废物中升级金属提供了一种新策略。
