Removal and recovery of silver nanoparticles by hierarchical mesoporous calcite: Performance, mechanism, and sustainable application

The widespread use of silver nanoparticles (AgNPs) inevitably leads to the environmental release of AgNPs. The released AgNPs can pose ecological risks because of their specific toxicity. However, they can also be used as secondary sources of silver metal. Herein, hierarchical mesoporous calcite (HM...

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Veröffentlicht in:Environmental research 2020-08, Vol.187, p.109699-109699, Article 109699
Hauptverfasser: Yin, Wei, Liu, Meng, Zhao, Tian-Lei, Qian, Fei-Jin, Li, Han, Yao, Qi-Zhi, Fu, Sheng-Quan, Zhou, Gen-Tao
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container_end_page 109699
container_issue
container_start_page 109699
container_title Environmental research
container_volume 187
creator Yin, Wei
Liu, Meng
Zhao, Tian-Lei
Qian, Fei-Jin
Li, Han
Yao, Qi-Zhi
Fu, Sheng-Quan
Zhou, Gen-Tao
description The widespread use of silver nanoparticles (AgNPs) inevitably leads to the environmental release of AgNPs. The released AgNPs can pose ecological risks because of their specific toxicity. However, they can also be used as secondary sources of silver metal. Herein, hierarchical mesoporous calcite (HMC) was prepared and used to remove and recover AgNPs from an aqueous solution. The batch experiments show that the HMC has high removal percentages for polyvinylpyrrolidone- and poly (vinyl alcohol)-coated AgNPs (PVP- and PVA-AgNPs) over a wide pH range of 6–10. The adsorption isotherms indicate that the maximum removal capacities are 55 and 19 mg g−1 for PVP-AgNPs and PVA-AgNPs, respectively, corresponding to partition coefficients (PCs) of 0.55 and 0.77 mg g−1 μM−1. Furthermore, the removal performance is also not impaired by coexisting anions, such as Cl−, NO3−, SO42−, and CO32−. Their removal mechanisms can be ascribed to the electrostatic attraction and chemical adsorption between the HMC and polymer-coated AgNPs. Calcium ions on the HMC surface serve as active sites for coordination with the oxygen-bearing functional groups of AgNP coatings. Moreover, the AgNPs adsorbed onto HMC show high catalytic activity and good reusability for the reduction of the organic pollutant 4-nitrophenol. This work may pave the way not only to remove metal nanopollutants from waters but also to convert them into functional materials. [Display omitted] •A new route combining AgNP removal and recovery by the HMC is developed.•The HMC has high removal percentages for the AgNPs over a wide pH range.•The removal performance is not impaired by coexisting inorganic anions.•The recovered AgNPs show reproducible catalytic activity for 4-NP.
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The released AgNPs can pose ecological risks because of their specific toxicity. However, they can also be used as secondary sources of silver metal. Herein, hierarchical mesoporous calcite (HMC) was prepared and used to remove and recover AgNPs from an aqueous solution. The batch experiments show that the HMC has high removal percentages for polyvinylpyrrolidone- and poly (vinyl alcohol)-coated AgNPs (PVP- and PVA-AgNPs) over a wide pH range of 6–10. The adsorption isotherms indicate that the maximum removal capacities are 55 and 19 mg g−1 for PVP-AgNPs and PVA-AgNPs, respectively, corresponding to partition coefficients (PCs) of 0.55 and 0.77 mg g−1 μM−1. Furthermore, the removal performance is also not impaired by coexisting anions, such as Cl−, NO3−, SO42−, and CO32−. Their removal mechanisms can be ascribed to the electrostatic attraction and chemical adsorption between the HMC and polymer-coated AgNPs. 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[Display omitted] •A new route combining AgNP removal and recovery by the HMC is developed.•The HMC has high removal percentages for the AgNPs over a wide pH range.•The removal performance is not impaired by coexisting inorganic anions.•The recovered AgNPs show reproducible catalytic activity for 4-NP.</description><identifier>ISSN: 0013-9351</identifier><identifier>EISSN: 1096-0953</identifier><identifier>DOI: 10.1016/j.envres.2020.109699</identifier><language>eng</language><publisher>Elsevier Inc</publisher><subject>Adsorption ; aqueous solutions ; CaCO3 ; calcite ; calcium ; Catalysis ; catalytic activity ; electrostatic interactions ; Nanopollutant ; nanosilver ; p-nitrophenol ; pollutants ; Polymer-coated AgNP ; porous media ; silver ; toxicity</subject><ispartof>Environmental research, 2020-08, Vol.187, p.109699-109699, Article 109699</ispartof><rights>2020 Elsevier Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c372t-39a0b6a82e4b91d6fca0fab469d8975abcc74e7743dd21987313abd4df1c6883</citedby><cites>FETCH-LOGICAL-c372t-39a0b6a82e4b91d6fca0fab469d8975abcc74e7743dd21987313abd4df1c6883</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0013935120305922$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Yin, Wei</creatorcontrib><creatorcontrib>Liu, Meng</creatorcontrib><creatorcontrib>Zhao, Tian-Lei</creatorcontrib><creatorcontrib>Qian, Fei-Jin</creatorcontrib><creatorcontrib>Li, Han</creatorcontrib><creatorcontrib>Yao, Qi-Zhi</creatorcontrib><creatorcontrib>Fu, Sheng-Quan</creatorcontrib><creatorcontrib>Zhou, Gen-Tao</creatorcontrib><title>Removal and recovery of silver nanoparticles by hierarchical mesoporous calcite: Performance, mechanism, and sustainable application</title><title>Environmental research</title><description>The widespread use of silver nanoparticles (AgNPs) inevitably leads to the environmental release of AgNPs. 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subjects Adsorption
aqueous solutions
CaCO3
calcite
calcium
Catalysis
catalytic activity
electrostatic interactions
Nanopollutant
nanosilver
p-nitrophenol
pollutants
Polymer-coated AgNP
porous media
silver
toxicity
title Removal and recovery of silver nanoparticles by hierarchical mesoporous calcite: Performance, mechanism, and sustainable application
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