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Palygorskite Supporting Homogeneously Dispersed Ag Nanoparticles: Molten Salt Method and Enhanced Antibacterial Performance

Published online by Cambridge University Press:  01 January 2024

Qiuzhi He ,
Qingze Chen Open the ORCID record for Qingze Chen [Opens in a new window] ,
Runliang Zhu ,
Jing Du ,
Shiya He ,
Guocheng Lv ,
Cheng Gu  and
Aiqin Wang
Qiuzhi He
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China Department of Public Health, School of Medicine, Guangxi University of Science and Technology, Liuzhou 545005, Guangxi, China CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China University of Chinese Academy of Sciences, Beijing 100049, China
Qingze Chen*
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China University of Chinese Academy of Sciences, Beijing 100049, China
Runliang Zhu
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China University of Chinese Academy of Sciences, Beijing 100049, China
Jing Du
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China University of Chinese Academy of Sciences, Beijing 100049, China
Shiya He
Affiliation:
CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China University of Chinese Academy of Sciences, Beijing 100049, China
Guocheng Lv
Affiliation:
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China
Cheng Gu
Affiliation:
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
Aiqin Wang
Affiliation:
Key Laboratory of Clay Mineral Applied Research of Gansu Province, Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese, Academy of Sciences, Lanzhou 730000, China
*
e-mail: chenqingze@gig.ac.cn
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Abstract

Supported silver nanoparticles (Ag NPs) have been used extensively as antibacterial agents in biomedicine, biotechnology, and environmental remediation. However, a facile and scalable method for preparing Ag NPs dispersed homogeneously on supports remains a challenge. In this study, a novel molten salt method was developed successfully to synthesize the supported, homogeneously dispersed Ag NPs on palygorskite. Abundant pores and ample surface hydroxyl groups of palygorskite served as anchoring sites, preventing the rapid growth, aggregation, and sintering of Ag NPs. Typically, palygorskite was mixed with AgNO3 (as a precursor) and NaNO3 (as a dispersant), and then the mixture was heated slowly. During the heating process, the AgNO3 decomposed gradually into Ag NPs and the molten NaNO3 with a high concentration of ions dispersed the newly formed Ag NPs. The Ag NPs were dispersed homogeneously on the palygorskite and had very small particle sizes (~5.8 nm) even for a significant loading amount (~9 wt.%). As antibacterial agents, the Ag/palygorskite nanocomposites showed enhanced antibacterial activity, compared with those synthesized without the introduction of molten NaNO3. In addition, the key effect of the surface hydroxyl groups of palygorskite on the characteristics of the loaded Ag and the corresponding antibacterial activity were also elucidated. As such, the present work provided a novel and facile strategy for the synthesis, without a chemical reductant or surfactant, of supported, highly dispersed Ag NPs on clay minerals and this could have potential in the scalable production and practical application of Ag-based antibacterial materials.

Keywords

Antibacterial activityClay mineralsMolten saltPalygorskiteSilver nanoparticles
Type
Original Paper
Information
Clays and Clay Minerals , Volume 70 , Issue 6 , December 2022 , pp. 809 - 823
Copyright
Copyright © The Author(s), under exclusive licence to The Clay Minerals Society 2023

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