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Title: Adsorption of copper (II) on mesoporous silica: the effect of nano-scale confinement

Abstract

Nano-scale spatial confinement can alter chemistry at mineral–water interfaces. These nano-scale confinement effects can lead to anomalous fate and transport behavior of aqueous metal species. When a fluid resides in a nanoporous environments (pore size under 100 nm), the observed density, surface tension, and dielectric constant diverge from those measured in the bulk. To evaluate the impact of nano-scale confinement on the adsorption of copper (Cu2+), we performed batch adsorption studies using mesoporous silica. Mesoporous silica with the narrow distribution of pore diameters (SBA-15; 8, 6, and 4 nm pore diameters) was chosen since the silanol functional groups are typical to surface environments. Batch adsorption isotherms were fit with adsorption models (Langmuir, Freundlich, and Dubinin–Radushkevich) and adsorption kinetic data were fit to a pseudo-first-order reaction model. We found that with decreasing pore size, the maximum surface area-normalized uptake of Cu2+ increased. The pseudo-first-order kinetic model demonstrates that the adsorption is faster as the pore size decreases from 8 to 4 nm. We attribute these effects to the deviations in fundamental water properties as pore diameter decreases. Additionally, these effects are most notable in SBA-15 with a 4-nm pore where the changes in water properties may be responsible for the enhancedmore » Cu mobility, and therefore, faster Cu adsorption kinetics.« less

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1619401
Alternate Identifier(s):
OSTI ID: 1473957
Report Number(s):
SAND-2018-9809J
Journal ID: ISSN 1467-4866; 13; PII: 57
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Published Article
Journal Name:
Geochemical Transactions
Additional Journal Information:
Journal Name: Geochemical Transactions Journal Volume: 19 Journal Issue: 1; Journal ID: ISSN 1467-4866
Publisher:
Springer Science + Business Media
Country of Publication:
United Kingdom
Language:
English
Subject:
58 GEOSCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; Nano-scale confinement; Adsorption isotherm; Adsorption kinetics; Mesoporous silica

Citation Formats

Knight, Andrew W., Tigges, Austen B., and Ilgen, Anastasia G. Adsorption of copper (II) on mesoporous silica: the effect of nano-scale confinement. United Kingdom: N. p., 2018. Web. doi:10.1186/s12932-018-0057-4.
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Knight, Andrew W., Tigges, Austen B., & Ilgen, Anastasia G. Adsorption of copper (II) on mesoporous silica: the effect of nano-scale confinement. United Kingdom. https://doi.org/10.1186/s12932-018-0057-4
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Knight, Andrew W., Tigges, Austen B., and Ilgen, Anastasia G. Tue . "Adsorption of copper (II) on mesoporous silica: the effect of nano-scale confinement". United Kingdom. https://doi.org/10.1186/s12932-018-0057-4.
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@article{osti_1619401,
title = {Adsorption of copper (II) on mesoporous silica: the effect of nano-scale confinement},
author = {Knight, Andrew W. and Tigges, Austen B. and Ilgen, Anastasia G.},
abstractNote = {Nano-scale spatial confinement can alter chemistry at mineral–water interfaces. These nano-scale confinement effects can lead to anomalous fate and transport behavior of aqueous metal species. When a fluid resides in a nanoporous environments (pore size under 100 nm), the observed density, surface tension, and dielectric constant diverge from those measured in the bulk. To evaluate the impact of nano-scale confinement on the adsorption of copper (Cu2+), we performed batch adsorption studies using mesoporous silica. Mesoporous silica with the narrow distribution of pore diameters (SBA-15; 8, 6, and 4 nm pore diameters) was chosen since the silanol functional groups are typical to surface environments. Batch adsorption isotherms were fit with adsorption models (Langmuir, Freundlich, and Dubinin–Radushkevich) and adsorption kinetic data were fit to a pseudo-first-order reaction model. We found that with decreasing pore size, the maximum surface area-normalized uptake of Cu2+ increased. The pseudo-first-order kinetic model demonstrates that the adsorption is faster as the pore size decreases from 8 to 4 nm. We attribute these effects to the deviations in fundamental water properties as pore diameter decreases. Additionally, these effects are most notable in SBA-15 with a 4-nm pore where the changes in water properties may be responsible for the enhanced Cu mobility, and therefore, faster Cu adsorption kinetics.},
doi = {10.1186/s12932-018-0057-4},
journal = {Geochemical Transactions},
number = 1,
volume = 19,
place = {United Kingdom},
year = {Tue Jun 26 00:00:00 EDT 2018},
month = {Tue Jun 26 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1186/s12932-018-0057-4
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Cited by: 31 works
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Figures / Tables:

Table 1 Table 1: Pore size and BET surface area of SBA-15-8, SBA-15-6, and SBA-15-4
All figures and tables (9 total)
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    Adsorption characteristics of copper ion on nanoporous silica
    journal, June 2019

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