Capture-to-catalyst hollow N-doped porous carbons for closed-loop gold recovery and nitrate-to-ammonia electrocatalysis
閉ループ金回収と硝酸塩からアンモニアへの電解触媒のための捕捉触媒中空Nドープ多孔質炭素 (AI 翻訳)
Yutong Ding, Ruicong Geng, Wenzhao Duan, Zheng-Jun Wang, Jing-Jing Lv, Ge Meng, Wenxian Liu, Tairong Kuang
🤖 gxceed AI 要約
日本語
本研究は、ZIF-8由来の中空窒素ドープ多孔質炭素（HNPC）を開発し、金の選択的回収と硝酸塩からアンモニアへの電解還元触媒として再利用する閉ループシステムを実証した。HNPCは高い金吸着容量と選択性を示し、回収後の金担持触媒は高いファラデー効率でアンモニア合成を促進する。この材料戦略は、資源循環と環境修復の統合に貢献する。
English
This study develops a ZIF-8-derived hollow N-doped porous carbon (HNPC) as a capture-to-catalyst platform for closed-loop gold recovery and nitrate-to-ammonia electrocatalysis. HNPC exhibits high gold adsorption capacity and selectivity, and the resulting Au/HNPC catalyst achieves high Faradaic efficiency for ammonia synthesis. This materials strategy integrates resource circularity with environmental remediation.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では、資源循環型社会の構築や廃水からの貴金属回収が注目されており、本技術は都市鉱山からの金回収や環境浄化に応用できる可能性がある。ただし、実用化にはスケールアップやコスト評価が課題であり、現時点でのGX政策への直接的な関連は限定的。
In the global GX context
Globally, this work contributes to the circular economy and sustainable catalysis, aligning with the growing interest in resource recovery and green chemistry. However, its direct relevance to climate disclosure or transition finance is limited, as it focuses on materials science rather than policy or corporate practice.
👥 読者別の含意
🔬研究者:Materials scientists and environmental chemists can explore the capture-to-catalyst concept for other metals and reactions.
📄 Abstract（原文）
Abstract Materials that recover dilute metals and convert the recovered species into functional catalysts can link resource circularity with environmental remediation, yet their design is constrained by a trade-off between rapid transport and reactive binding. Here, we report a ZIF−8-derived hollow N-doped porous carbon (HNPC) as a capture-to-catalyst platform for closed-loop gold recovery and nitrate-to-ammonia electrocatalysis. The hollow mesoporous framework shortens diffusion pathways and improves access to internal surfaces, whereas graphitic-N-associated sites promote AuCl4− adsorption and Au(III)-to-Au(0) reduction. The optimized HNPC exhibits a Langmuir Au(III) capacity of 3245.1 mg·g-1 and removes >99.9% of Au at trace concentrations under strong ionic competition, corresponding to a distribution coefficient of ~3×109 mL·g−1. Time‑resolved microscopy and spectroscopy reveal rapid Au nanoparticle nucleation and progressive conversion to Au(0), while finite−element simulations and density functional theory (DFT) identify the cooperative roles of hollow-structure-enabled transport and graphitic-N-regulated interfacial reactivity. The resulting Au/HNPC is directly reused as a gas-diffusion-electrode catalyst, delivering 96.6% Faradaic efficiency for nitrate-to-ammonia conversion and stable operation for 535 h at 200 mA·cm−2. This work establishes a materials strategy for integrating selective recovery, in situ metal formation, and catalytic reuse in complex aqueous media.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.26599/nre.2026.9120261first seen 2026-08-12 04:51:58
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