In situ self-reduction synthesis of silver nanoparticles on MIL-101(Cr)-NH2 for enhanced adsorption of Br- and I-: Synergistic effect a nd mechanism

被引：1

作者：

Zhang, Qiongyuan ^{[1
,3
]}

Wang, Yanping ^{[1
,3
]}

Liu, Haining ^{[1
]}

Zhang, Huifang ^{[1
]}

Wu, Zhijian ^{[1
]}

Zhang, Siyuan ^{[1
]}

Li, Junwei ^{[2
]}

Han, Wenjie ^{[1
]}

Ye, Xiushen ^{[1
]}

机构：

[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Green & Highly end Utilizat Salt Lake Reso, Key Lab Salt Lake Resources Chem Qinghai Prov, Xining 810008, Qinghai, Peoples R China

[2] Katholieke Univ Leuven, Dept Chem Engn, Celestijnenlaan 200F, B-3001 Leuven, Belgium

[3] Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2025年 / 360卷

关键词：

MIL-101(Cr)-NH 2; Silver nanoparticles; In situ self-reduction; Adsorption mechanism; Bromide and iodide ions; METAL-ORGANIC FRAMEWORKS; IODIDE ADSORPTION; AQUEOUS-SOLUTIONS; REMOVAL; WATER; EFFICIENT; BROMIDE; CARBON; ION; THERMODYNAMICS;

D O I：

10.1016/j.seppur.2024.131015

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

MOFs materials have attracted much attention in the field of halogen ion adsorption due to their unique structural characteristics and functions. However, for the improvement of ion adsorption capacity and selectivity is still challenging. This study synthesized silver nanoparticles in situ on MIL-101(Cr)-NH2 through chemical reactions, resulting in a silver-loaded MIL-101(Cr)-NH-CH2OH composite adsorbent. The characterization of the adsorbent revealed that the nano silver was uniformly loaded on the adsorbent, and that the adsorbent exhibited good thermal stability. The adsorption experiments show that Br- and I- can be selectively captured by the adsorbent even in the presence of high concentrations of competing ions (Cl-, NO3-, SO42- and CO32-). When the silver loading is 8%, the 8%Ag@MIL-101(Cr)-NH2-CH2OH demonstrates excellent adsorption performance, and the adsorption capacities are 0.947 mmol g-1 for Br- and 1.011 mmol g-1 for I-, with adsorption equilibrium times of approximately 180 min. The adsorption isotherms and kinetics are consistent with the Langmuir isotherm model and the pseudo-second-order kinetic model, respectively. Adsorption thermodynamics suggest that the adsorption process is spontaneous and exothermic. Experiment studies and theoretical calculations have demonstrated that the adsorption of Br- and I- is facilitated through a synergistic process involving precipitation, electrostatic interactions, and ion exchange, while also benefiting from its large specific surface area and abundant pore structure. The matrix material MOF and the loaded silver nanoparticles play a synergistic role in the adsorption process, and the desorption process is realized through desorption solution and light-driven decomposition. The results of this study indicate that the composite material under investigation has the potential to serve as an effective and selective adsorbent for the extraction of Br- and I- from complex ionic solutions.

引用

页数：15