Abstract：
As a noble metal with extremely high economic benefits, the recovery of silver ions has attracted a particular deal of attention. However, it is a challenge to recover silver ions efficiently and selectively from aqueous solutions. In this research, the novel metal-organic frameworks (MOFs) adsorbent (Zr-DPHT) is prepared for the highly efficient and selective recovery of silver ions from wastewater. Experimental findings reveal that Zr-DPHT\'s adsorption of Ag(I) constitutes an endothermic process, with an optimal pH of 5 and exhibits a maximum adsorption capacity of 268.3 mg·g-1. Isotherm studies show that the adsorption of Ag(I) by Zr-DPHT is mainly monolayer chemical adsorption. Kinetic studies indicate that the internal diffusion of Ag(I) in Zr-DPHT may be the rate-limiting step. The mechanism for Ag(I) adsorption on Zr-DPHT involves electrostatic interactions and chelation. In competitive adsorption, Ag(I) has the largest partition coefficient (9.64 mL·mg-1), indicating a strong interaction between Zr-DPHT and Ag(I). It is proven in the adsorption-desorption cycle experiments that Zr-DPHT has good regeneration performance. The research results indicate that Zr-DPHT can serve as a potential adsorbent for efficiently and selectively capturing Ag(I), providing a new direction for MOFs in the recycling field of precious metals.
摘要：
作为一种具有极高经济效益的贵金属，银离子的回收引起了特别的关注。然而,从水溶液中有效和选择性地回收银离子是一个挑战。在这项研究中,制备了新型金属有机骨架（MOFs）吸附剂（Zr-DPHT），用于高效和选择性地从废水中回收银离子。实验结果表明，Zr-DPHT对Ag(I)的吸附构成了一个吸热过程，最佳pH为5，最大吸附容量为268.3mg·g-1。等温线研究表明，Zr-DPHT对Ag（I）的吸附主要是单层化学吸附。动力学研究表明，Ag（I）在Zr-DPHT中的内部扩散可能是限速步骤。Ag（I）在Zr-DPHT上的吸附机理涉及静电相互作用和螯合。在竞争性吸附中，Ag(I)的分配系数最大(9.64mL·mg-1),表明Zr-DPHT和Ag(I)之间的强相互作用。在吸附-解吸循环实验中证明，Zr-DPHT具有良好的再生性能。研究结果表明，Zr-DPHT可以作为高效、选择性地捕获Ag(I)的潜在吸附剂，为MOFs在贵金属回收领域的应用提供了新的方向。
