A novel β-cyclodextrin polymer modified by sulfonate groups

Zhao, Dong; Zhao, Liang; Zhu, Chengshen; Wang, Jing; Lv, Xiang-Hua

doi:10.1007/s10847-011-0024-5

Cited by 10 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…45 An adsorption band in (a) and (b) appearing at 1738 cm −1 is due to the CO stretching vibration of carboxyl groups and ester groups. 46 After thermal cross-linking, the band at 1650 cm −1 owing to the O−H deformation vibration 47 and the band at 1332 cm −1 owing to the carboxylate groups 48 decreased, suggesting the cross-linking reaction had occurred. The reaction formed an ester bond between the hydroxyl groups from β-cyclodextrin and the carboxyl group from PAA or citric acid (inset of Figure 2).…”

Section: Mb Adsorption Studymentioning

confidence: 99%

Synthesis of β-Cyclodextrin-Based Electrospun Nanofiber Membranes for Highly Efficient Adsorption and Separation of Methylene Blue

Zhao

Wang

et al. 2015

ACS Appl. Mater. Interfaces

299

113

View full text Add to dashboard Cite

Water-insoluble β-cyclodextrin-based fibers were synthesized by electrospinining followed by thermal cross-linking. The fibers were characterized by field-emission scanning electron microscopic (FE-SEM) and Fourier transformed infrared spectrometer (FT-IR). The highly insoluble fraction obtained from different pH values (3-11) indicates successful cross-linking reactions and their usability in aqueous solution. After the cross-linking reaction, the fibers' tensile strength increases significantly and the BET surface area is 19.49 m(2)/g. The cross-linked fibers exhibited high adsorption capacity for cationic dye methylene blue (MB) with good recyclability. The adsorption performance can be fitted well with pseudo-second-order model and Langmuir isotherm model. The maximum adsorption capacity is 826.45 mg/g according to Langmuir fitting. Due to electrostatic repulsion, the fibers show weak adsorption toward negatively charged anionic dye methyl orange (MO). On the basis of the selective adsorption, the fiber membrane can separate the MB/MO mixture solution by dynamic filtration at a high flow rate of 150 mL/min. The fibers can maintain good fibrous morphology and high separation efficiency even after five filtration-regeneration cycles. The obtained results suggested potential applications of β-cyclodextrin-based electrospun fibers in the dye wastewater treatment field.

show abstract

Section: Mb Adsorption Studymentioning

confidence: 99%

Synthesis of β-Cyclodextrin-Based Electrospun Nanofiber Membranes for Highly Efficient Adsorption and Separation of Methylene Blue

Zhao

Wang

et al. 2015

ACS Appl. Mater. Interfaces

299

113

View full text Add to dashboard Cite

show abstract

“…The sorption mechanism is, in general, of chemisorption, essentially based on host-guest interactions, but physisorption interaction also occurs once the swelling degree/crosslinking degree has an influence on the sorption removal [4]. The success of EPI-CD materials as adsorbents is embodied in the number of cyclodextrin derivatives, such as hydroxypropyl, carboxymethyl, aminoethyl, methyl, and sulfonyl, used to polymerize with EPI and evaluated for pollutant removal [65][66][67][68].…”

Section: Scheme 1 Polymerization Of Cyclodextrin (Cd) By Crosslinking With Epichlorohydrin (Epi)mentioning

confidence: 99%

Cyclodextrin Polymers and Cyclodextrin-Containing Polysaccharides for Water Remediation

et al. 2021

View full text Add to dashboard Cite

Chemical pollution of water has raised great concerns among citizens, lawmakers, and nearly all manufacturing industries. As the legislation addressing liquid effluents becomes more stringent, water companies are increasingly scrutinized for their environmental performance. In this context, emergent contaminants represent a major challenge, and the remediation of water bodies and wastewater demands alternative sorbent materials. One of the most promising adsorbing materials for micropolluted water environments involves cyclodextrin (CD) polymers and cyclodextrin-containing polysaccharides. Although cyclodextrins are water-soluble and, thus, unusable as adsorbents in aqueous media, they can be feasibly polymerized by using different crosslinkers such as epichlorohydrin, polycarboxylic acids, and glutaraldehyde. Likewise, with those coupling agents or after substituting hydroxyl groups with more reactive moieties, cyclodextrin units can be covalently attached to a pre-existing polysaccharide. In this direction, the functionalization of chitosan, cellulose, carboxymethyl cellulose, and other carbohydrate polymers with CDs is vastly found in the literature. For the system containing CDs to be used for remediation purposes, there are benefits from a synergy that arises from (i) the ability of CD units to interact selectively with a broad spectrum of molecules, forming inclusion complexes and higher-order supramolecular assemblies, (ii) the functional groups of the crosslinker comonomers, (iii) the three-dimensional structure of the crosslinked network, and/or (iv) the intrinsic characteristics of the polysaccharide backbone. In view of the most recent contributions regarding CD-based copolymers and CD-containing polysaccharides, this review discusses their performance as adsorbents in micropolluted water environments, as well as their interaction patterns, addressing the influence of their structural and physicochemical properties and their functionalization.

show abstract

“…Similar to carboxyl groups, sulfo/sulfonate groups (-SO3H/-SO3 -) were supposed to enhance the adsorption properties of polysaccharides as well. A sulfonate group modified β-CD polymer was prepared by using EPI as cross-linker and tiron (1,2-dihydroxybenzene-3,5disulfonic acid disodium salt) as modifier in three steps (Figure 21) [185]. The sulfonate functionality was determined to be 0.174 mmol g -1 by elemental analysis.…”

Section: Functionalized With Sulfur Groupsmentioning

confidence: 99%

Cross-linked chitosan and β-cyclodextrin as functional adsorbents in water treatment

Zhao

2020

Advanced Water Treatment

View full text Add to dashboard Cite

In recent decades, the worldwide occurrence in water resources of various pollutants, such as toxic heavy metals, dyes, and pharmaceuticals, has raised increasing public attention about the inverse effects on human health and environment. Polysaccharides, such as chitosan and -cyclodextrin, have the potential to remove these pollutants from water. The present thesis consists of the preparation of five poly(carboxylic acid)s (PACs) or their dianhydrides cross-linked chitosan and/or -cyclodextrin adsorbents, their characterizations, their applications in water treatment, their kinetic and isotherm studies, their probable adsorption mechanisms, and their regeneration abilities.In these settings, chitosan is considered as the backbone of the adsorbents; PACs, such as EDTA and DTPA, act as not only linkages but also chelating groups, which are effective in adsorption of metal ions, and thus enhance the metal uptake abilities of the polysaccharide materials significantly; the immobilized -cyclodextrin cavities are expected to capture organic molecules through host-guest inclusion interaction. These settings combined the advantages of each component while at the same time diminishing their disadvantages.Based on this design, the selective adsorption of targeted metals from multi-metal system was realized by magnetic EDTA-/DTPA-chitosan, due to the fact that the chelating groups possess different binding affinities toward different metals; the simultaneous and efficient removal of metal and dyes were achieved by EDTA-cross-linked -cyclodextrin (EDTA-CDP).The adsorption kinetics were very fast for all the prepared adsorbents. The isotherms revealed the adsorption mechanisms of chelation for metals as well as host-guest inclusion for organic pollutants. These also indicated the regeneration methods for the spent adsorbents, such as diluted nitrate acid for metal-loaded adsorbents and ethanol solvent for organic pollutant-loaded adsorbents. The stability and regenerability guaranteed their applications in practical wastewater such as a real industrial effluent from a nonferrous metal smelter. Lastly, prior to analysis, EDTA-CDP was successfully applied to preconcentrate rare earth elements from seawaters. Overall, both the experimental results and theoretical studies suggest that the studied cross-linked chitosan and/or cyclodextrin polymers are the promising adsorbents in wastewater treatment.

show abstract

A novel β-cyclodextrin polymer modified by sulfonate groups

Cited by 10 publications

References 31 publications

Synthesis of β-Cyclodextrin-Based Electrospun Nanofiber Membranes for Highly Efficient Adsorption and Separation of Methylene Blue

Synthesis of β-Cyclodextrin-Based Electrospun Nanofiber Membranes for Highly Efficient Adsorption and Separation of Methylene Blue

Cyclodextrin Polymers and Cyclodextrin-Containing Polysaccharides for Water Remediation

Cross-linked chitosan and β-cyclodextrin as functional adsorbents in water treatment

Contact Info

Product

Resources

About