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Mechanisms and factors influencing the removal/recovery of gold nanoparticles by thermally modified pyrite

Published online by Cambridge University Press:  27 December 2024

Yuhong Fu ,
Shanshan Zhang ,
Qin Liu ,
Shanshan Li ,
Shuai Zhang ,
Sen Li ,
Can Wu  and
Meimei Ran
Yuhong Fu*
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
Shanshan Zhang
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
Qin Liu
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
Shanshan Li
Affiliation:
School of Chemistry and Materials Science, Guizhou Normal University, Guiyang, China
Shuai Zhang
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
Sen Li
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
Can Wu
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
Meimei Ran
Affiliation:
School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China
*
Corresponding author: Yuhong Fu; Email: [email protected]
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Abstract

The environmental effects of nanoparticles have attracted widespread attention. The removal and recycling of nanoparticles are crucial for both environmental protection and resource reuse. However, current removal and recycling methods are not yet mature, and there is a need to explore inexpensive materials for the efficient removal and recycling of nanoparticles. This study investigates the effects of pyrite species, thermal modification temperature, pH and ionic strength on the adsorption of gold nanoparticles (AuNPs) by pyrite. The experimental results demonstrate that the adsorption rate of artificially thermally modified pyrite is slightly faster than that of naturally thermally modified pyrite. However, the concentration of Fe ions dissolved from the artificially thermally modified pyrite is higher. Natural pyrite, when thermally modified at 400°C and 500°C, adsorbs 100% of AuNPs within 10 min. The lower the acidity of the system, the faster the adsorption rate. Conversely, an increase in ionic strength decreases the adsorption rate. Artificially thermally modified pyrite primarily adsorbs AuNPs through electrostatic gravitational attraction, which is supplemented by a significant amount of chemisorption. After four recycling cycles, the adsorption and desorption rates of AuNPs using artificially thermally modified pyrite were 92.1% and 94.2%, respectively, indicating excellent adsorption and recovery performance. The results of this study provide a new method for the recycling of nanoparticles and an experimental basis for the further application of thermally modified pyrite in environmental treatments.

Keywords

nanoparticlespyritethermal modificationadsorptionelectrostatic attraction
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 15
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Guest Editor: Anxu Sheng

This paper is part of a thematic set on Nanominerals and mineral nanoparticles

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