A covalent organic framework bearing thioether pendant arms for selective detection and recovery of Au from ultra-low concentration aqueous solution

Abstract

A fluorescent covalent organic framework (COF), featuring precise distribution of thioether pendant arms inside the cavity, was designed. The thioether-functionalized COF exhibits selective sensing and capture of Au ions at ultra-trace levels in water with high sensitivity, selectivity and adsorption capacity, which makes it an excellent candidate for selective detection and recovery of Au.

Chiral covalent organic frameworks: design, synthesis and property

“…Demonstrated applications of COFs include explosive sensing, 178 humidity sensing, 179 pH detection, 180 biosensing, 181 gas sensing, 182 and metal ion sensing. 183 For example, in 2016, Jiang et al developed a highly luminescent AIE-active COF as a highly sensitive sensor to detect ammonia (AIE = aggregation-induced emission). 54 Wang et al constructed a thioether-functionalized COF for highly sensitive detection and effective removal of Hg 2+ .…”

Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

“…Dyes and phenolic derivatives adsorption [54] X%[NH 2 ]-COF 1000-2000 Primary amines PFAS adsorption [55] P-CDP β-cyclodextrin Micropollutants (aromatic compounds, pesticide, plastic components and pharmaceuticals) [56] P-PAP[n]s 529-533 Pillar [5]arene Herbicide adsorption [57] CalP 596-759 Calix[n]arene Dyes and BPA [58,59] DFB-CDP <10 β-cyclodextrin and decafluorobiphenyl PFAS adsorption [60,61] SA-COF 1588.56 Salicylideneaniline Charge-, size-and chemselective separation [62] COP-99 Fluorine Charge-specific and size-dependent separation [63] β-CD film β-cyclodextrin and carboxylic acid Shape-selective dye rejection [64] pTC-SC4A and pTC-P5A films 123 and 85 Cyclophanes Selective dye rejection [65] TAPB-PDA COF >2000 Imine-linked framework Dye rejection [66] EB-COF:Br Positive charged framework Anionic dye rejection [67] 2D polyimine thin film -Hexyl chains Salt rejection and dye separation [68] COF8, 9, 10 -Carboxyl and tertiary amine groups Cation sieving [69] TAPB-BMTTPA-COF 1934 Methyl sulfide Hg 2+ adsorption [52] COF-LZU8 Thioether Hg 2+ detection and adsorption [53] PAF-10 Pyridine rings and carboxyl groups Pb 2+ adsorption [70] MIPAFs-11 Salicylaldoxime U(VI) extraction [71] SMP Thiophene rings Hg 2+ adsorption [72] HOTT-HATN 526. 5 Pyridine ring Pb 2+ adsorption [73] TTB-COF 36 Thioether Au 3+ detection and adsorption [74] Fc-HPP 1015 Ferrocene Dye, Pb 2+ and Hg 2+ adsorption [75] POP-Ims -Imidazolium moiety Cr 2 O 7 2− capture [76] COF-BTA-DHBZ Hydroxyl group Cr(VI) removal [77] PFCMP-0 Perfluorous group Pb(II) and As(V) adsorption [78] TMBPT N-heterocycles Selective Ag + adsorption and H 2 S sensing [79] TpODH Hydrazone Cu(II) and Hg(II) adsorption [80] [85]…”

“…In addition to the thiol functionalization, [149] other functional groups like S heteroatom ring, [72] N heteroatom, [73,80] perfluorous group, [78] ferrocene, [75] carboxyl and phenolate [178] groups have also been selected as chelating sites for the removal of other ions like Pb 2+ , [70,178,200] Au 3+ , [74] Nd 3+ , [148] and others. [201] Liu et al introduced an easy-to-make porous conjugated polymer (TMBPT), which consisted of a triazine ring bonded to three 3,5-dimethylpyrazole moieties.…”

Integrating single Ni sites into biomimetic networks of covalent organic frameworks for selective photoreduction of CO2

“…[19][20][21][22][23][24] The periodic and permanent porosity endow COFs with a naturemimicking architecture, while the diverse compositions and synthetic approaches allow COFs with tunable microstructures and optical and electronic structures. [25][26][27][28][29] The highly conjugated structure in-plane in COFs can ensure the mobility of photoinduced charges. [30][31][32][33] Moreover, COFs with tunable porosity can accommodate guest molecules for target applications.…”