Volume 134, Issue 1 e202112511
Forschungsartikel
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Mo3S132− Intercalated Layered Double Hydroxide: Highly Selective Removal of Heavy Metals and Simultaneous Reduction of Ag+ Ions to Metallic Ag0 Ribbons

Lixiao Yang

Lixiao Yang

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

These authors contributed equally to this work.

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Linxia Xie

Linxia Xie

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

These authors contributed equally to this work.

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Menglin Chu

Menglin Chu

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

These authors contributed equally to this work.

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Hui Wang

Hui Wang

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

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Dr. Mengwei Yuan

Corresponding Author

Dr. Mengwei Yuan

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

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Zihuan Yu

Zihuan Yu

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

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Chaonan Wang

Chaonan Wang

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

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Prof. Huiqin Yao

Corresponding Author

Prof. Huiqin Yao

School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004 China

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Dr. Saiful M. Islam

Dr. Saiful M. Islam

Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA

Department of chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217 USA

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Dr. Keren Shi

Dr. Keren Shi

State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, 750021 China

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Prof. Dongpeng Yan

Prof. Dongpeng Yan

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

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Prof. Shulan Ma

Corresponding Author

Prof. Shulan Ma

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875 China

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Prof. Mercouri G. Kanatzidis

Corresponding Author

Prof. Mercouri G. Kanatzidis

Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208 USA

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First published: 28 October 2021
Citations: 3

Abstract

We demonstrate a new material by intercalating Mo3S132− into Mg/Al layered double hydroxide (abbr. Mo3S13-LDH), exhibiting excellent capture capability for toxic Hg2+ and noble metal silver (Ag). The as-prepared Mo3S13-LDH displays ultra-high selectivity of Ag+, Hg2+ and Cu2+ in the presence of various competitive ions, with the order of Ag+>Hg2+>Cu2+>Pb2+≥Co2+, Ni2+, Zn2+, Cd2+. For Ag+ and Hg2+, extremely fast adsorption rates (≈90 % within 10 min, >99 % in 1 h) are observed. Much high selectivity is present for Ag+ and Cu2+, especially for trace amounts of Ag+ (≈1 ppm), achieving a large separation factor (SFAg/Cu) of ≈8000 at the large Cu/Ag ratio of 520. The overwhelming adsorption capacities for Ag+ (qmAg=1073 mg g−1) and Hg2+ (qmHg=594 mg g−1) place the Mo3S13-LDH at the top of performing sorbent materials. Most importantly, Mo3S13-LDH captures Ag+ via two paths: a) formation of Ag2S due to Ag-S complexation and precipitation, and b) reduction of Ag+ to metallic silver (Ag0). The Mo3S13-LDH is a promising material to extract low-grade silver from copper-rich minerals and trap highly toxic Hg2+ from polluted water.

Conflict of interest

The authors declare no conflict of interest.

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