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Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores.
Molecules. 2020 Mar 10; 25(5)M

Abstract

Removal of Cr(VI) from the environment represents a stringent issue because of its tremendous effects on living organisms. In this context, design of sorbents with high sorption capacity for Cr(VI) is getting a strong need. For this purpose, poly(vinylbenzyl chloride), impregnated into porous silica (PSi), was cross-linked with either N,N,N',N'-tetramethyl-1,2-ethylenediamine (TEMED) or N,N,N',N'-tetramethyl-1,3-propanediamine, followed by the reaction of the free -CH2Cl groups with N,N-diethyl-2-hydroxyethylamine to generate strong base anion exchangers (ANEX) inside the pores. The PSi/ANEX composite sorbents were deeply characterized by FTIR spectroscopy, SEM-energy dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), and water uptake. The sorption performances of composites against Cr(VI) were investigated as a function of pH, contact time, initial concentration of Cr(VI), and temperature. It was found that the cross-linker structure and the silica morphology are the key factors controlling the sorption capacity. The adsorption process was spontaneous and endothermic and well described by pseudo-second-order kinetic and Sips isotherm models. The maximum sorption capacity of 311.2 mg Cr(VI)/g sorbent was found for the composite prepared with mesoporous silica using TEMED as cross-linker. The PSi/ANEX composite sorbents represent an excellent alternative for the removal of Cr(VI) oxyanions, being endowed with fast kinetics, equilibrium in about 60 min, and a high level of reusability in successive sorption/desorption cycles.

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Authors+Show Affiliations

Dragan ES
"Petru Poni" Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41 A, 700487 Iasi, Romania.
Humelnicu D
Faculty of Chemistry, "Al. I. Cuza" University of Iasi, Bd. 11 Carol I, 700506 Iasi, Romania.

MeSH

AdsorptionAnionsChromiumHydrogen-Ion ConcentrationKineticsSilicon DioxideTemperatureWaterWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32164286

Citation

Dragan, Ecaterina Stela, and Doina Humelnicu. "Contribution of Cross-Linker and Silica Morphology On Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded Into Silica Pores." Molecules (Basel, Switzerland), vol. 25, no. 5, 2020.
Dragan ES, Humelnicu D. Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores. Molecules. 2020;25(5).
Dragan, E. S., & Humelnicu, D. (2020). Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores. Molecules (Basel, Switzerland), 25(5). https://doi.org/10.3390/molecules25051249
Dragan ES, Humelnicu D. Contribution of Cross-Linker and Silica Morphology On Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded Into Silica Pores. Molecules. 2020 Mar 10;25(5) PubMed PMID: 32164286.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores. AU - Dragan,Ecaterina Stela, AU - Humelnicu,Doina, Y1 - 2020/03/10/ PY - 2020/02/13/received PY - 2020/03/05/revised PY - 2020/03/08/accepted PY - 2020/3/14/entrez PY - 2020/3/14/pubmed PY - 2020/12/15/medline KW - anion exchanger KW - chromium (VI) KW - cross-linker KW - porous silica KW - reusability KW - sorption isotherm KW - sorption kinetics JF - Molecules (Basel, Switzerland) JO - Molecules VL - 25 IS - 5 N2 - Removal of Cr(VI) from the environment represents a stringent issue because of its tremendous effects on living organisms. In this context, design of sorbents with high sorption capacity for Cr(VI) is getting a strong need. For this purpose, poly(vinylbenzyl chloride), impregnated into porous silica (PSi), was cross-linked with either N,N,N',N'-tetramethyl-1,2-ethylenediamine (TEMED) or N,N,N',N'-tetramethyl-1,3-propanediamine, followed by the reaction of the free -CH2Cl groups with N,N-diethyl-2-hydroxyethylamine to generate strong base anion exchangers (ANEX) inside the pores. The PSi/ANEX composite sorbents were deeply characterized by FTIR spectroscopy, SEM-energy dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), and water uptake. The sorption performances of composites against Cr(VI) were investigated as a function of pH, contact time, initial concentration of Cr(VI), and temperature. It was found that the cross-linker structure and the silica morphology are the key factors controlling the sorption capacity. The adsorption process was spontaneous and endothermic and well described by pseudo-second-order kinetic and Sips isotherm models. The maximum sorption capacity of 311.2 mg Cr(VI)/g sorbent was found for the composite prepared with mesoporous silica using TEMED as cross-linker. The PSi/ANEX composite sorbents represent an excellent alternative for the removal of Cr(VI) oxyanions, being endowed with fast kinetics, equilibrium in about 60 min, and a high level of reusability in successive sorption/desorption cycles. SN - 1420-3049 UR - https://www.unboundmedicine.com/medline/citation/32164286/Contribution_of_Cross_Linker_and_Silica_Morphology_on_Cr_VI__Sorption_Performances_of_Organic_Anion_Exchangers_Embedded_into_Silica_Pores_ DB - PRIME DP - Unbound Medicine ER -