Microporous silica-supported cation exchanger with superior dimensional stability and outstanding exchange kinetics, and its application in element removal and enrichment

Wang, Xinpeng; Ye, Zhenxiong; Chen, Lifeng; Zheng, Qi; Liu, Caocong; Ning, Shunyan; Khayambashi, Afshin; Wei, Yuezhou

doi:10.1016/j.reactfunctpolym.2019.06.007

Cited by 11 publications

(19 citation statements)

References 46 publications

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“…Composite ion exchangers, having silica as a core coated with organic polymer layers, are endowed with a fast uptake of the ionic solutes and mass transfer properties more favorable for high-performance chromatographic separations [42,43], but their sorption capacity for ionic species is low in many cases, because most of the composite is occupied by the inorganic component. To remediate this limitation, various organic ionic polymers have been lately generated inside the silica pores [44][45][46]. The exchange kinetics and the dimensional stability of the ion exchangers during the multiple sorption/desorption cycles have been thus improved [44,45].…”

Section: Introductionmentioning

confidence: 99%

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Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Drăgan¹,

Humelnicu

2020

Molecules

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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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Section: Introductionmentioning

confidence: 99%

“…To remediate this limitation, various organic ionic polymers have been lately generated inside the silica pores [44][45][46]. The exchange kinetics and the dimensional stability of the ion exchangers during the multiple sorption/desorption cycles have been thus improved [44,45].…”

Section: Introductionmentioning

confidence: 99%

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Drăgan¹,

Humelnicu

2020

Molecules

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“…For the SiPAR, there was an endothermic effect in the range of 70-200 • C, corresponded to the mass loss of 0.46%, which resulted from the loss of adsorbed water; a weight loss about 1% at 200-300 • C was due to the presence of primary amine functional groups. The endothermic effect at 300-400 and 400-600 • C, separately corresponding to the thermooxidative decomposition of the benzene ring and carbon chain, were observed for both the SiPAR and SiPS [28]. These observations indicated that the functional groups were successfully grafted to the silica-based polymers.…”

Section: Characterizationmentioning

confidence: 84%

“…SiPS was synthesized by an in situ polymerization method, where styrene and divinylbenzene were drawn into the silica pores in a rotating flask under a vacuum state and then reacted under suitable conditions. The relevant details are described in a previous purification [28].…”

Section: Preparation Of Silica-supported Polystyrene (Sips)mentioning

confidence: 99%

“…In this work, a silica-supported primary amine resin (SiPAR) was synthesized by in situ polymerization in the pores of macroporous silica. The silica as the framework not only provided abundant pores for the composite resin but also restricted and protected the internal organic polymers, which resulted in fast adsorption kinetics, negligible swelling, and good mechanical properties [28]. To the best of our knowledge, there have been no studies on V(V) removal using this resin.…”

Section: Introductionmentioning

confidence: 99%

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Removal of V(V) From Solution Using a Silica-Supported Primary Amine Resin: Batch Studies, Experimental Analysis, and Mathematical Modeling

Huang

Chen

et al. 2020

Molecules

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Every year, a large quantity of vanadium-containing wastewater is discharged from industrial factories, resulting in severe environmental problems. In particular, V(V) is recognized as a potentially hazardous contaminant due to its high mobility and toxicity, and it has received considerable attention. In this study, a silica-supported primary amine resin (SiPAR) was prepared by in-situ polymerization, and the V(V) adsorption from the solution was examined. The as-prepared resin exhibited fast adsorption kinetics, and it could attain an equilibrium within 90 min for the V(V) solution concentration of 100 mg/L at an optimum pH of 4, whereas the commercial D302 resin required a treatment time of more than 3 h under the same conditions. Furthermore, the maximum adsorption capacity of the resin under optimum conditions for V(V) was calculated to be 70.57 mg/g. In addition, the kinetics and isotherm data were satisfactorily elucidated with the pseudo-second-order kinetics and Redlich–Peterson models, respectively. The silica-based resin exhibited an excellent selectivity for V(V), and the removal efficiency exceeded 97% in the presence of competitive anions at 100 mmol/L concentrations. The film mass-transfer coefficient (kf) and V(V) pore diffusivity (Dp) onto the resins were estimated by mathematical modeling. In summary, this study provided a potential adsorbent for the efficient removal of V(V) from wastewater.

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Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

He,

Liao,

Tang

et al. 2024

J Radioanal Nucl Chem

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Microporous silica-supported cation exchanger with superior dimensional stability and outstanding exchange kinetics, and its application in element removal and enrichment

Cited by 11 publications

References 46 publications

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Removal of V(V) From Solution Using a Silica-Supported Primary Amine Resin: Batch Studies, Experimental Analysis, and Mathematical Modeling

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

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