Journal ArticleDOI
Sorptive removal of cobalt, strontium and cesium onto manganese and iron oxide-coated montmorillonite from groundwater
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TLDR
In this article, single- and bi-solute competitive sorptions of Co, Sr and Cs were conducted, and the Freundlich, Langmuir and Dubinin-Radushkevich models fitted the single solute sorption data well.Abstract:
Applicability of montmorillonite, manganese oxide-coated montmorillonite (MOCM) and iron oxide-coated montmorillonite (IOCM) as backfill materials in permeable reactive barrier (PRB) to remediate contaminated groundwater was investigated. Single- and bi-solute competitive sorptions of Co, Sr and Cs were conducted. The Freundlich, Langmuir and Dubinin-Radushkevich models fitted the single-solute sorption data well (R
2 > 0.95). Maximum sorption capacities (q
mL) of Co and Sr predicted by the Langmuir model were in the order of MOCM (0.37 mmol/g for Co and 0.28 mmol/g for Sr) > montmorillonite (0.27 mmol/g for Co and 0.19 mmol/g for Sr) ≈ IOCM (0.23 mmol/g for Co and 0.21 mmol/g for Sr), while those of Cs were in the order of montmorillonite (1.11 mmol/g) > MOCM (0.68 mmol/g) > IOCM (0.62 mmol/g). In the bi-solute sorptions, the sorbed amount of one solute decreased due to the presence of the other competing metal ion. Langmuir model parameters for single-solute (q
mL and b
L) and bi-solute (
$$ q_{\text{mL}}^{*} $$
and $$ b_{\text{L}}^{ *} $$
) sorptions were compared to analyze the effect of competition between the metal ions. The competitive Langmuir (R
2 > 0.81) and P-factor (R
2 > 0.82) models predicted the bi-solute competitive sorption data well but not the SRS model (0.003 < R
2 < 0.97).read more
Citations
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19. Al-Degs Y., MAM Khraisheh, Tutunji, M.F, Sorption of lead ions on diatomite and manganese-oxides modified diatomite.
TL;DR: In this article, the intrinsic exchange properties of diatomaceous earth (diatomite) were further improved by modification with manganese oxides, which showed a higher tendency for adsorbing lead ions.
Journal ArticleDOI
Manganese oxides and their application to metal ion and contaminant removal from wastewater
Md. Aminul Islam,Md. Aminul Islam,David W. Morton,Bruce B. Johnson,Bandita Mainali,Michael J. Angove +5 more
TL;DR: Manganese oxides are ubiquitous in soil, sediment and aquatic environment and have attracted widespread attention as excellent adsorbents for the removal of metal ions and contaminants from water/wastewater as mentioned in this paper.
Journal ArticleDOI
Enhanced Sr adsorption performance of MnO2-alginate beads in seawater and evaluation of its mechanism
Hye-Jin Hong,Byoung-Gyu Kim,Jeongsik Hong,Jungho Ryu,Taegong Ryu,Kang-Sup Chung,Hyunchul Kim,In-Su Park +7 more
TL;DR: It is demonstrated that MnO 2 -alginate beads are a highly feasible adsorbent for Sr removal from seawater due to its enhanced Sr selectivity against Na and increased number of Sr adsorption sites.
Journal ArticleDOI
Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs+ adsorption capacity and selective recovery by flotation
TL;DR: In this article, a three-step synthesis has been demonstrated whereby pristine montmorillonite clay was readily modified to incorporate KCuHCF nanoparticles for enhanced and selective 137C+ removal from aqueous environments.
Journal ArticleDOI
Opportunities and constraints of using the innovative adsorbents for the removal of cobalt(II) from wastewater: A review
Md. Aminul Islam,David W. Morton,Bruce B. Johnson,Biplob Kumar Pramanik,Bandita Mainali,Michael J. Angove +5 more
TL;DR: In this article, the authors provide an overview of the state of the art in the removal of cobalt(II)-polluted water using various adsorbents such as carbonaceous and activated carbon materials, nanosized metal oxides, low-cost natural materials, clay minerals and nanocomposites.
References
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Journal ArticleDOI
Adsorption of a few heavy metals on natural and modified kaolinite and montmorillonite: a review.
TL;DR: The feasibility of using two important and common clay minerals, kaolinite and montmorillonite, as adsorbents for removal of toxic heavy metals has been reviewed.
Journal ArticleDOI
Arsenic adsorption onto iron oxide-coated cement (IOCC): Regression analysis of equilibrium data with several isotherm models and their optimization
TL;DR: In this article, the authors examined the equilibrium sorption of arsenic (III and V) from aqueous environment onto iron oxide-coated cement (IOCC) at 288, 298 and 308 K, and determined the equilibrium Sorption isotherms.
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Evaluation of zeolite A for the sorptive removal of Cs+ and Sr2+ ions from aqueous solutions using batch and fixed bed column operations
TL;DR: Zeolite A was chemically synthesized and evaluated, as inorganic ion exchange material, for the removal of cesium and strontium ions from aqueous solutions in both batch and fixed bed column operations indicating that the overall system kinetics was dominated by external mass transfer in the initial part of the sorption process in the column.
Journal ArticleDOI
Equilibrium modelling of single and binary adsorption of cadmium and nickel onto bagasse fly ash
TL;DR: In this paper, the competitive adsorption of cadmium (Cd(II)) and nickel (Ni(II) ions onto bagasse fly ash (BFA) from single component and binary systems was investigated.