Ding Lin, Wang Huiling, Xi Meng, Wang Qiang, Ren Wei, Shao Penghui, Luo Xubiao
Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang 330063, PR China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China.
Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang 330063, PR China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; School of Life Science, Jinggangshan University, Ji'an 343009, PR China.
J Colloid Interface Sci. 2024 Nov 15;674:884-893. doi: 10.1016/j.jcis.2024.06.199. Epub 2024 Jun 30.
Silver (Ag) recovery is essential for ecological protection, human health and economic benefits. Effective capture of Ag(I) from wastewater is still challenging due to insufficient accessible sites of adsorbents. Herein, an acyl chloride-mediated strategy is developed to synthesize rhodanine (Rd) modified UiO-66 derivatives for Ag(I) adsorption. Benefitting from the high grafting density of Rd, the optimal Rd-modified UiO-66-NH (UiO-66-NH@20Rd) features an ultra-high uptake capacity (maximum capacity of 923.9 mg·g) and selectivity (maximum selectivity coefficient of 1665.52) for Ag(I). Almost 90 % of Ag(I) could be captured in one minute over UiO-66-NH@20Rd and maintained a removal rate of 98.9 % even after six cycles. Moreover, a fixed-bed column test demonstrates that approximately 21,780 bed volumes of Ag(I) simulated wastewater can be effectively treated, indicating great promise for practical application. Mechanism investigation illustrates that outstanding performance can be attributed to the synergistic effect of Ag(I) adsorption and reduction on dense rhodanine sites. This study highlights that such a general strategy can provide a valuable avenue toward various functional adsorption materials.
银（Ag）的回收对于生态保护、人类健康和经济效益至关重要。由于吸附剂的可及位点不足，从废水中有效捕获Ag（I）仍然具有挑战性。在此，开发了一种酰氯介导的策略来合成用于Ag（I）吸附的罗丹宁（Rd）修饰的UiO-66衍生物。得益于Rd的高接枝密度，最佳的Rd修饰的UiO-66-NH（UiO-66-NH@20Rd）对Ag（I）具有超高的吸附容量（最大容量为923.9 mg·g）和选择性（最大选择性系数为1665.52）。在UiO-66-NH@20Rd上，几乎90%的Ag（I）可以在一分钟内被捕获，即使经过六个循环，去除率仍保持在98.9%。此外，固定床柱试验表明，大约21780床体积的Ag（I）模拟废水可以得到有效处理，显示出巨大的实际应用前景。机理研究表明，优异的性能可归因于Ag（I）在致密罗丹宁位点上的吸附和还原的协同作用。这项研究强调，这种通用策略可以为各种功能吸附材料提供一条有价值的途径。
