Adsorption of methyl iodide on reduced silver-functionalized silica aerogel: Kinetics and modeling

Siqi Tang; Seungrag Choi; Yue Nan; Lawrence L. Tavlarides

doi:10.1002/aic.17137

Adsorption of methyl iodide on reduced silver-functionalized silica aerogel: Kinetics and modeling

Siqi Tang, Seungrag Choi, Yue Nan, Lawrence L. Tavlarides

Department of Biomedical & Chemical Engineering

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

The low concentration methyl iodide (CH₃I) adsorption process on reduced silver-functionalized silica aerogel (Ag⁰-Aerogel) was studied. The kinetic data were acquired using a continuous flow adsorption system. Because the corresponding physical process was observed, the shrinking core model (SCM) was modified and applied. An average CH₃I pore diffusivity was calculated, the CH₃I-Ag⁰-Aerogel reaction was identified as a 1.40 order reaction instead of first order reaction, and the n^th order reaction rate constant was determined. This modified SCM significantly increases the accuracy of adsorption behavior prediction at low adsorbate concentration. Modeling results indicate that the overall adsorption process is controlled by the pore diffusion. However, at low adsorbate concentration (ppbv level), the CH₃I adsorption is limited to the surface reaction due to the low uptake rate in a predictable time period.

Original language	English (US)
Article number	e17137
Journal	AIChE Journal
Volume	67
Issue number	4
DOIs	https://doi.org/10.1002/aic.17137
State	Published - Apr 2021

Keywords

adsorption
iodine removal
separation
shrinking core model
silver aerogel

ASJC Scopus subject areas

Biotechnology
Environmental Engineering
General Chemical Engineering

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10.1002/aic.17137

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title = "Adsorption of methyl iodide on reduced silver-functionalized silica aerogel: Kinetics and modeling",

abstract = "The low concentration methyl iodide (CH3I) adsorption process on reduced silver-functionalized silica aerogel (Ag0-Aerogel) was studied. The kinetic data were acquired using a continuous flow adsorption system. Because the corresponding physical process was observed, the shrinking core model (SCM) was modified and applied. An average CH3I pore diffusivity was calculated, the CH3I-Ag0-Aerogel reaction was identified as a 1.40 order reaction instead of first order reaction, and the nth order reaction rate constant was determined. This modified SCM significantly increases the accuracy of adsorption behavior prediction at low adsorbate concentration. Modeling results indicate that the overall adsorption process is controlled by the pore diffusion. However, at low adsorbate concentration (ppbv level), the CH3I adsorption is limited to the surface reaction due to the low uptake rate in a predictable time period.",

keywords = "adsorption, iodine removal, separation, shrinking core model, silver aerogel",

author = "Siqi Tang and Seungrag Choi and Yue Nan and Tavlarides, {Lawrence L.}",

note = "Publisher Copyright: {\textcopyright} 2020 American Institute of Chemical Engineers",

year = "2021",

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doi = "10.1002/aic.17137",

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T1 - Adsorption of methyl iodide on reduced silver-functionalized silica aerogel

T2 - Kinetics and modeling

AU - Tang, Siqi

AU - Choi, Seungrag

AU - Nan, Yue

AU - Tavlarides, Lawrence L.

PY - 2021/4

Y1 - 2021/4

N2 - The low concentration methyl iodide (CH3I) adsorption process on reduced silver-functionalized silica aerogel (Ag0-Aerogel) was studied. The kinetic data were acquired using a continuous flow adsorption system. Because the corresponding physical process was observed, the shrinking core model (SCM) was modified and applied. An average CH3I pore diffusivity was calculated, the CH3I-Ag0-Aerogel reaction was identified as a 1.40 order reaction instead of first order reaction, and the nth order reaction rate constant was determined. This modified SCM significantly increases the accuracy of adsorption behavior prediction at low adsorbate concentration. Modeling results indicate that the overall adsorption process is controlled by the pore diffusion. However, at low adsorbate concentration (ppbv level), the CH3I adsorption is limited to the surface reaction due to the low uptake rate in a predictable time period.

AB - The low concentration methyl iodide (CH3I) adsorption process on reduced silver-functionalized silica aerogel (Ag0-Aerogel) was studied. The kinetic data were acquired using a continuous flow adsorption system. Because the corresponding physical process was observed, the shrinking core model (SCM) was modified and applied. An average CH3I pore diffusivity was calculated, the CH3I-Ag0-Aerogel reaction was identified as a 1.40 order reaction instead of first order reaction, and the nth order reaction rate constant was determined. This modified SCM significantly increases the accuracy of adsorption behavior prediction at low adsorbate concentration. Modeling results indicate that the overall adsorption process is controlled by the pore diffusion. However, at low adsorbate concentration (ppbv level), the CH3I adsorption is limited to the surface reaction due to the low uptake rate in a predictable time period.

KW - adsorption

KW - iodine removal

KW - separation

KW - shrinking core model

KW - silver aerogel

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Adsorption of methyl iodide on reduced silver-functionalized silica aerogel: Kinetics and modeling

Abstract

Keywords

ASJC Scopus subject areas

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