Cyclodextrin-ionic liquid polyurethanes for application in drinking water treatment

Malefetse, Tshepo J.; Mamba, Bhekie B.; Krause, Rui Werner Maçedo; Mahlambi, MM

doi:10.4314/wsa.v35i5.49199

Cited by 20 publications

(8 citation statements)

References 20 publications

(22 reference statements)

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“…CDs are slightly soluble in water and this restricts their application in water purification. This necessitates their functionalization and, in particular, polymerization of the parental CDs with suitable bifunctional linkers such as hexamethylene diisocyanate (HDI) and toluene diisocyanate (TDI) [35]. Evidence of polymerization was confirmed by the disappearance of the isocyanate peak (Figure 3(a)) in the FTIR spectrum.…”

Section: Ftir Spectroscopy Analysismentioning

confidence: 99%

Kinetics, Equilibrium, and Thermodynamics of the Sorption of Bisphenol A onto N-CNTs-β-Cyclodextrin and Fe/N-CNTs-β-Cyclodextrin Nanocomposites

Mphahlele

Mhlanga

2015

Journal of Nanomaterials

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We analysed the adsorptive behaviour of Fe/N-CNTs--CD nanocomposite in the removal of bisphenol A (BPA) from aqueous solution and identified the key influencing parameters. The Fe/N-CNTs--CD nanocomposite adsorbent was prepared by dispersing Fe uniformly on N-CNTs--CD using a microwave polyol method and characterized using Fourier transform infrared spectroscopy (FTIR), focused ion beam scanning electron microscopy (FIB-SEM), and energy-dispersive X-ray spectroscopy (EDS). The solution pH and temperature had minimal effect on sorption of BPA while the initial concentration and adsorbent mass affected the adsorption of BPA. No leaching of Fe into the water was observed; thus the nanocomposites were found suitable for use in water purification. From equilibrium isotherm studies, the Langmuir isotherm model gave the best description of the experimental data. The Langmuir monolayer adsorption capacities of BPA onto N-CNTs--CD and Fe/N-CNTs--CD are 38.20 mg⋅g −1 and 80.65 mg⋅g −1 at 298 K, respectively. Evidently, these adsorption capacity values gave an indication that uniform dispersion of Fe N-CNTs--CD prepared by the microwave polyol method enhances the adsorption of BPA. Meanwhile, the sorption kinetics of BPA onto Fe/N-CNTs--CD were best described by the pseudo-second-order model.

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Section: Ftir Spectroscopy Analysismentioning

confidence: 99%

Kinetics, Equilibrium, and Thermodynamics of the Sorption of Bisphenol A onto N-CNTs-β-Cyclodextrin and Fe/N-CNTs-β-Cyclodextrin Nanocomposites

Mphahlele

Mhlanga

2015

Journal of Nanomaterials

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“…Cyclodextrin ionic liquid polyurethanes were reported for application in drinking water treatment [47]. These systems demonstrated to be capable of removing both organic and inorganic pollutants from water.…”

Section: Ionic Liquids From Cyclodextrinsmentioning

confidence: 99%

Chiral Ionic Liquids from Carbohydrates: Synthesis and Properties

Pereira¹

2012

Mini-Reviews in Organic Chemistry

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Due to their particular properties the use of ionic liquids is growing. Because of their chiral discriminated properties chiral ionic liquids synthesized from mono, polysaccharides or cyclodextrins are used as catalysts in asymmetric synthesis, chiral selectors in NMR studies or as stationary phases in chiral chromatographic analysis. Chiral carbohydrate ionic liquids are a recent topic and only few examples in the literature describe applications of ionic liquids derived from monosaccharides. Isomannide and isosorbide are the most explored and demonstrate important features as chiral selectors and as catalysts in asymmetric synthesis. Carbohydrate imidazolium salts have been explored as soluble supports for oligosaccharide synthesis and polymers resulting from carbohydrate ionic liquids polymerization have been reported. Cyclodextrin ionic liquids have been described and the ability to produce inclusion complexes was explored.

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“…The polymer was evaluated as a solid-liquid phase-transfer catalyst and molecular host system for nucleophilic substitution reactions [15]. The synthesis and application of water insoluble CD-IL polymers in the removal of model pollutants (PNP, TCP, and Cr 6+ ) from water was also reported [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of β-cyclodextrin on morphologies and chemical, thermal, and mechanical properties of non-chain extended polyurethane elastomers

2016

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A series of polyurethane elastomers (PUEs) were synthesized from an aromatic diisocyanate (4,4′-diphenylmethane diisocyanate (MDI)), a polyether polyol (polytetramethylene glycol; molecular weight: 1000 Da (PTMG1000)), and using β-cyclodextrin (β-CD) as the cross-linker. In this study, we investigated the effects of the addition of β-CD on the morphologies and chemical, thermal, and mechanical properties. The introduction of β-CD in the main chain of PUEs was verified using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and swelling test. The morphology was analyzed through SEM and confocal laser scanning microscopy (CLSM). The results show that the PUEs containing β-CD units exhibited an incompatible microstructure that was improved by the addition of β-CD. The tensile strength of PUEs decreased with the addition of β-CD; however, the elasticity was maintained for <5 % β-CD content. The dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) were used to prove the existence of a chemically cross-linked structure and evaluate the thermal stability of PUEs having different β-CD content.

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Cyclodextrin-ionic liquid polyurethanes for application in drinking water treatment

Cited by 20 publications

References 20 publications

Kinetics, Equilibrium, and Thermodynamics of the Sorption of Bisphenol A onto N-CNTs-β-Cyclodextrin and Fe/N-CNTs-β-Cyclodextrin Nanocomposites

Kinetics, Equilibrium, and Thermodynamics of the Sorption of Bisphenol A onto N-CNTs-β-Cyclodextrin and Fe/N-CNTs-β-Cyclodextrin Nanocomposites

Chiral Ionic Liquids from Carbohydrates: Synthesis and Properties

Influence of β-cyclodextrin on morphologies and chemical, thermal, and mechanical properties of non-chain extended polyurethane elastomers

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