Water-Stable Amino-Functionalized Coordination Polymer for Efficient Hg²⁺ Capture

Abstract

Hg 2+ pollution seriously harms human life and health, and it is of great significance to develop Hg 2+ removal materials with excellent performance. In this work, a crystalline coordination polymer material {[Zn(L)(A)]•DMF} n (1) with 4.8 mmol/g amino loading density was engineered by using amino-functionalized ligands. Strong coordination properties of isonicotinic acid and adenine endow 1 with excellent chemical stability and thermal stability. Results of the removal experiment showed that 1 could efficiently remove >96% Hg 2+ within 10 min, and the saturated adsorption amount was 273 mg/g, which shows advantages over most reported MOF adsorbents. After combining IR spectra, XPS spectra, and CO 2 adsorption results, displacement of the characteristic peak demonstrated that the excellent capture performance is mainly attributed to the coordination interaction between high-density amino groups and Hg 2+ . This work provides a new consideration for the practical application of MOF adsorbents.

Adenine-based bio-MOFs with high water and acid–base stability for ammonia capture

“…Amazingly, in aqueous solutions with various pH values from 1-14, they were still highly ordered and stable, and this provides the possibility of basic NH 3 uptake. Considering the normal Zn-O and Zn-N bond lengths 40,[42][43][44][45] and the intramolecular hydrogen bonds, the high stability was ascribed to the resistance of -NH 2 groups in the channel, possibly through the formation of strong hydrogen bonds with the attacker to avoid the decomposition of the host framework. 46 Vibrational spectroscopy has been proven to be a facile tool to characterize the crystal structure and the structural transformation process.…”

“…S1†). The crystal structure of Zn(3-AIN)(AD)·DMF has been briefly described in the literature, 40 in which the unlocated DMF was removed using the SQUEEZE subprogram of the PLATON program 41 during the refinement. Herein, we provide a more representative discussion of the features potentially important for the structural comparison and for the insight into the adsorption behavior.…”

Selective recognition of Hg2+ ions in aqueous solution by a CdII-based metal–organic framework with good stability and vacant coordination sites

“…[1][2][3][4][5][6][7][8] The accumulation of Hg 2+ ions in tissues could give rise to several disorders, such as neuropathic disorders, cardiovascular disorders, acrodynia, digestive diseases, recognition memory impairments, hippocampal dysfunction, psychiatric disorders, chronic nephritis, minamata disease, and even death. 3,[9][10][11][12][13][14] Therefore, it is urgent to develop a Hg 2+ detection material with water stability.…”

“…and between Hg 2+ and the S atom (e.g., -SH, S-CH 3 -SCN, R-S-R, etc.). [9][10][11]16,[31][32][33][34] In this work, multiple-ligand linkers containing N and S atoms were designed to develop a promising MOF material for Hg 2+ detection. A two-dimensional (2D) Cd II -based MOF with the formula {[Cd(BIBT)(TDC)]•2H 2 O} n (JXUST-28) was designed and synthesized based on 4,7-bi(1H-imidazol-1-yl)benzo-[2,1,3] thiadiazole (BIBT) and 2,5-thiophenedicarboxylic acid (H 2 TDC) ligands (Scheme 1).…”

Three new Zn(ii) coordination polymers for highly selective and sensitive detection of Fe3+

“…Imidazole-containing ligands are widely used because of their good coordination ability. [34][35][36][37][38][39][40] In this work, two different polycarboxylic ligands 5-((2carboxyphenoxy)methyl)benzene-1,3-dioic acid (H 3 L1) and 5-((3-carboxyphenoxy)methyl)benzene-1,3-dioic acid (H 3 L2) were used to synthesize new CPs. These two ligands are the same except for the position of one carboxyl group and can show an effective π-system conjugation degree because of their benzene rings.…”