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Title: Effective removal of trace-level toxic metals from flue gas desulfurization wastewater using SiO2 supported hydrogel sorbent

Abstract

Flue gas desulfurization (FGD) wastewater generated from coal-fired power plants contain potentially harmful heavy metal pollutants that pose a threat to public health and clean water. In this work, we present a water stable polyethylenimine-n,n’-methylenebisacrylamide (PEI-MBAA) functionalized SiO2 solid sorbent material (PMS-1.2/1/4) and investigate its metal adsorption kinetics, selectivity, regenerability, and space velocity. The kinetic studies of six of the toxic heavy metals (As, Cd, Cr, Pb, Se, and Hg) prepared with single elements in Milli-Q water showed the effect of chemical bonding and intraparticle mass transfer resistance on the sorption process. The selectivity studies demonstrated the significant adsorption efficiency toward trace-level heavy metals (Se, Cd, U, Al, etc.) from authentic industrial FGD wastewater. Through five consecutive adsorption–desorption cycles with the FGD (uptake)-citrate (release)-based buffer pair, the sorbent showed high heavy metal removal ability and good reusability. The maximum flow rate for the removal of Se from industrial FGD wastewater was determined to be as high as 8 bed volumes/minute of the sorbent bed. Finally, the results demonstrate the PMS-1.2/1.4 sorbent is a promising candidate for the removal of heavy metals from practical aqueous solutions.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
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  1. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1984048
Alternate Identifier(s):
OSTI ID: 1958655
Grant/Contract Number:  
89243318CFE000003
Resource Type:
Accepted Manuscript
Journal Name:
Materials Today Sustainability
Additional Journal Information:
Journal Volume: 21; Journal ID: ISSN 2589-2347
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; adsorption kinetics; poly(ethyleneimine); flue gas desulfurization (FGD) water; regeneration; space velocity

Citation Formats

Wang, Qiuming, Wilfong, Walter C., Kail, Brain, Ji, Tuo, Shi, Fan, and Gray, McMahan. Effective removal of trace-level toxic metals from flue gas desulfurization wastewater using SiO2 supported hydrogel sorbent. United States: N. p., 2023. Web. doi:10.1016/j.mtsust.2023.100324.
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Wang, Qiuming, Wilfong, Walter C., Kail, Brain, Ji, Tuo, Shi, Fan, & Gray, McMahan. Effective removal of trace-level toxic metals from flue gas desulfurization wastewater using SiO2 supported hydrogel sorbent. United States. https://doi.org/10.1016/j.mtsust.2023.100324
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Wang, Qiuming, Wilfong, Walter C., Kail, Brain, Ji, Tuo, Shi, Fan, and Gray, McMahan. Mon . "Effective removal of trace-level toxic metals from flue gas desulfurization wastewater using SiO2 supported hydrogel sorbent". United States. https://doi.org/10.1016/j.mtsust.2023.100324. https://www.osti.gov/servlets/purl/1984048.
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@article{osti_1984048,
title = {Effective removal of trace-level toxic metals from flue gas desulfurization wastewater using SiO2 supported hydrogel sorbent},
author = {Wang, Qiuming and Wilfong, Walter C. and Kail, Brain and Ji, Tuo and Shi, Fan and Gray, McMahan},
abstractNote = {Flue gas desulfurization (FGD) wastewater generated from coal-fired power plants contain potentially harmful heavy metal pollutants that pose a threat to public health and clean water. In this work, we present a water stable polyethylenimine-n,n’-methylenebisacrylamide (PEI-MBAA) functionalized SiO2 solid sorbent material (PMS-1.2/1/4) and investigate its metal adsorption kinetics, selectivity, regenerability, and space velocity. The kinetic studies of six of the toxic heavy metals (As, Cd, Cr, Pb, Se, and Hg) prepared with single elements in Milli-Q water showed the effect of chemical bonding and intraparticle mass transfer resistance on the sorption process. The selectivity studies demonstrated the significant adsorption efficiency toward trace-level heavy metals (Se, Cd, U, Al, etc.) from authentic industrial FGD wastewater. Through five consecutive adsorption–desorption cycles with the FGD (uptake)-citrate (release)-based buffer pair, the sorbent showed high heavy metal removal ability and good reusability. The maximum flow rate for the removal of Se from industrial FGD wastewater was determined to be as high as 8 bed volumes/minute of the sorbent bed. Finally, the results demonstrate the PMS-1.2/1.4 sorbent is a promising candidate for the removal of heavy metals from practical aqueous solutions.},
doi = {10.1016/j.mtsust.2023.100324},
journal = {Materials Today Sustainability},
number = ,
volume = 21,
place = {United States},
year = {Mon Jan 09 00:00:00 EST 2023},
month = {Mon Jan 09 00:00:00 EST 2023}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.mtsust.2023.100324
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Figures / Tables:

Scheme 1 Scheme 1: Proposed mechanism of graft polymerization and crosslinking. Crosslinked PEI/MBAA network was impregnated in the pores of the silica substrate.
All figures and tables (6 total)
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