Engineering Heteroatomic Nanotraps in Vinyl-Benzazole COFs: Record Capacity and 99% Selectivity for Photocatalytic Gold Recovery From E-Waste; Advanced Materials; Vol. 38, iss. 15
| Parent link: | Advanced Materials.— .— Weinheim: Wiley-VCH Vol. 38, iss. 15.— 2026.— Artcile number e72446, 10 p |
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| Other Authors: | , , , , , , , |
| Summary: | Title screen The recovery of gold from electronic waste is a critical environmental and technological challenge for a circular and sustainable economy. Conventional methods for gold recovery often suffer from low efficiency, poor selectivity, and reliance on harsh chemicals. In this work, we engineered three vinyl-azole-bridged covalent organic frameworks (COFs), systematically controlling heteroatom motifs to elucidate the structure-activity relationships behind gold ion adsorption and photocatalytic reduction. This strategic incorporation of azole-based units yielded hydrogen-bonded nanotraps along the pore walls, thereby maximizing active-site density and enhancing electrostatic interactions for the selective capture of gold ions. We found that all these COFs show gold adsorption capacities exceeding 3600 mg g−1, with the thiazole-containing COF—featuring both nitrogen and sulfur—exhibiting the highest binding affinity and photocatalytic efficiency to a record value of 4658.1 mg g−1 under optimal conditions and a 99.2% efficiency for gold extraction. These results are confirmed by density functional theory (DFT) calculations, x-ray photoelectron spectroscopy, and real e-waste recovery experiments. The highly conjugated framework facilitates synergistic photoreduction of Au(III) to Au(0), exploiting the unique interplay between heteroatom chemistry, microenvironment engineering, and light-driven redox processes. This work introduces a new class of COF photocatalysts engineered with heteroatomic nanotraps, achieving exceptional gold recovery efficiency Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://doi.org/10.1002/adma.72446 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=688504 |
| Summary: | Title screen The recovery of gold from electronic waste is a critical environmental and technological challenge for a circular and sustainable economy. Conventional methods for gold recovery often suffer from low efficiency, poor selectivity, and reliance on harsh chemicals. In this work, we engineered three vinyl-azole-bridged covalent organic frameworks (COFs), systematically controlling heteroatom motifs to elucidate the structure-activity relationships behind gold ion adsorption and photocatalytic reduction. This strategic incorporation of azole-based units yielded hydrogen-bonded nanotraps along the pore walls, thereby maximizing active-site density and enhancing electrostatic interactions for the selective capture of gold ions. We found that all these COFs show gold adsorption capacities exceeding 3600 mg g−1, with the thiazole-containing COF—featuring both nitrogen and sulfur—exhibiting the highest binding affinity and photocatalytic efficiency to a record value of 4658.1 mg g−1 under optimal conditions and a 99.2% efficiency for gold extraction. These results are confirmed by density functional theory (DFT) calculations, x-ray photoelectron spectroscopy, and real e-waste recovery experiments. The highly conjugated framework facilitates synergistic photoreduction of Au(III) to Au(0), exploiting the unique interplay between heteroatom chemistry, microenvironment engineering, and light-driven redox processes. This work introduces a new class of COF photocatalysts engineered with heteroatomic nanotraps, achieving exceptional gold recovery efficiency Текстовый файл AM_Agreement |
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| DOI: | 10.1002/adma.72446 |