离子纳米共价有机框架强化电子废水中金的回收。

IF 6.6 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2025-09-23 DOI:10.1002/cssc.202501155
Chaoji Xiong, Yuhan Wang, Kun Liang, Chunhua Wu, Wei Wu, Qian Chen
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引用次数: 0

摘要

虽然许多共价有机框架(COFs)可以将Au3+还原为Au0,但还原机制尚不清楚。这些COFs是由可逆的亚胺键形成的,它们对酸性环境的适应需要很长时间,这是化学合成的困难。因此,能够合成一类活性位点较少的新型酰胺连接(CONH)纳米cofs是很好的。虽然酰胺基COFs已被报道用于金回收,但COFs是使用后修饰技术(例如,动态亲核交换和氧化)制备的。本研究合成了由酰胺键连接的电中性纳米cof (Nano-COFA)和离子纳米cof(离子-纳米cofa)。纳米cofa(离子-纳米cofa)回收金主要是一个快速的化学吸附过程。纳米cofa(离子-纳米cofa)的最大吸附量分别为1334(1736)(25°C)、2044(2541)(35°C)和2933(3200)(45°C) mg -1。选择性吸附和循环再生实验表明,两种纳米cofs对金具有较高的选择性和可重复利用性。此外,C - N键作为还原剂,将Au3+转变为Au0而不影响COFs的结晶度。在实际电子废水处理中,两种纳米cofs均表现出较高的选择性和吸附效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ionic Nanocovalent Organic Frameworks for Enhanced Gold Recovery from Electronic Wastewater.

Although many covalent organic frameworks (COFs) can reduce Au3+ to Au0, the reduction mechanism is unclear. These COFs are formed by reversible imine bonds, and their adaptation to acidic environments takes long periods of time, which is difficult for chemical synthesis. As a result, it is great to be able to synthesize a new class of amide-linked (CONH) nano-COFs with fewer active sites. Although amide-based COFs have been reported for gold recovery, the COFs are prepared using postmodification techniques (e.g., dynamic nucleophilic exchange and oxidation). In this study, electrically neutral nano-COF (Nano-COFA) and ionic nano-COF (Ionic-nano-COFA) linked by amide bonds are synthesized. The recovery of gold by Nano-COFA (Ionic-nano-COFA) is primarily a fast chemisorption process. Nano-COFA (Ionic-nano-COFA) has a maximum adsorption capacity of 1334 (1736) (25 °C), 2044 (2541) (35 °C), and 2933 (3200) (45 °C) mg g-1, respectively. Selective adsorption and cyclic regeneration experiments demonstrate that the two types of nano-COFs exhibit high selectivity for gold and reusability. Additionally, the CN bonds act as reducing agents, changing Au3+ to Au0 without affecting the crystallinity of the COFs. For the treatment of real electronic wastewater, both types of nano-COFs show high selectivity and adsorption efficiency.

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来源期刊
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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