Electrospun cationic nanofiber membranes for adsorption and determination of Cr(<scp>vi</scp>) in aqueous solution: adsorption characteristics and discoloration mechanisms

Fang, Run; Shiu, Bing‐Chiuan; Ye, Yuansong; Zhang, Yuchi; Xue, Hanyu; Lou, Ching‐Wen; Lin, Jia‐Horng

doi:10.1039/d1ra05917c

Cited by 3 publications

(2 citation statements)

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“…Results demonstrate that the cationic degree of CHMS was 4.0, 2.9, and 0.8 mmol/g when the pH was 3, 7, and 9, respectively, indicating a substantial number of cationic groups on CHMS. As illustrated in Figure 1, CHMS contains plenty of primary and tertiary amine groups, and the p Ka values of them are both greater than 10, 34 suggesting that various amine groups on CHMS will be protonated even in weakly alkaline solutions. As a result, it can be inferred that the high cationic degree of CHMS is mostly due to the large number of protonated amine groups, and this protonation is strong enough to persist in acidic to weak alkaline environments.…”

Section: Resultsmentioning

confidence: 99%

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Ye,

Zhang,

et al. 2024

J of Applied Polymer Sci

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Herein, a cationic hydrogel microsphere (CHMS) was prepared by inverse suspension polymerization and freeze‐drying and was applied to the adsorptive removal of hexavalent chromium (Cr(VI)) from aqueous solution. Morphological characterization shows that there are lots of folds and pores on the surface of CHMS with a unique petal‐like appearance. According to the chemical structure analysis, CHMS contains plenty of functional groups such as amine and hydroxyl groups. These features give CHMS a larger specific surface area, faster adsorption rate, and higher adsorption capacity than the conventional cationic hydrogel microparticle (CHMP) adsorbent. The adsorption of Cr(VI) in water by CHMS is mainly based on the combination of electrostatic adsorption and redox reaction, with the electrostatic interaction between the protonated amine and Cr(VI) serving as the predominant adsorption mechanism. Experimental results reveal that CHMS can efficiently remove Cr(VI) from simulated wastewater in both batch and continuous adsorption modes, which is primarily due to its distinctive surface morphology and rich functional groups. Furthermore, the common coexisting metal ions in Cr(VI)‐containing wastewater have no substantial negative influence on the adsorption. Therefore, it can be concluded that CHMS has a promising application prospect in the treatment of Cr(VI)‐containing wastewater.

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Section: Resultsmentioning

confidence: 99%

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Ye,

Zhang,

et al. 2024

J of Applied Polymer Sci

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“…The relationship curve between adsorption time and adsorption capacity is shown in Figure 9. Due to a large number of binding points on the porous composite fiber and the high concentration of Cu 2+ in the solution, the adsorption capacity increases almost linearly [39], and the growth rate of the CTS-MMT porous composite fiber membrane is the largest. With the extension of adsorption time, due to the decrease in Cu 2+ concentration in the solution and the gradual reduction in binding points, the adsorption speed slows down.…”

Section: Kinetics Of Adsorption Of Cu 2+ On Porous Composite Fiber Me...mentioning

confidence: 99%

Preparation of Copper Ion Adsorbed Modified Montmorillonite/Cellulose Acetate Porous Composite Fiber Membrane by Centrifugal Spinning

Zhang

et al. 2022

Polymers

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The natural adsorption material montmorillonite (MMT) was selected, and cellulose acetate (CA) was used as the loading substrate to design and prepare a kind of green and environment-friendly recyclable porous composite fiber membrane with good heavy metal ion adsorption performance. Acetic acid modified montmorillonite (HCl-MMT), sodium dodecyl sulfonate modified montmorillonite (SDS-MMT), and chitosan modified montmorillonite (CTS-MMT) were prepared by inorganic modification and organic modification, and the porous MMT/CA composite fiber membrane was constructed by centrifugal spinning equipment. The morphological and structural changes of MMT before and after modification and their effects on porous composite fiber membranes were investigated. The morphology, structure, and adsorption properties of the composite fibers were characterized by scanning electron microscopy (SEM) and atomic absorption spectrometry (ASS). The experimental results showed that the maximum adsorption capacity of Cu2+ on the prepared 5 wt% CTS-MMT composite fiber membrane was 60.272 mg/g after 10 h static adsorption. The adsorption of Cu2+ by a porous composite fiber membrane conforms to the quasi-second-order kinetic model and Langmuir isothermal adsorption model. The main factor of the Cu2+ adsorption rate is chemical adsorption, and the adsorption mechanism is mainly monolayer adsorption.

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Highly efficient and sustainable cationic polyvinyl chloride nanofibrous membranes for removal of E. coli and Cr (VI): Filtration and adsorption

Shen,

Ma,

Khan

et al. 2024

Chemical Engineering Journal

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Electrospun cationic nanofiber membranes for adsorption and determination of Cr(vi) in aqueous solution: adsorption characteristics and discoloration mechanisms

Abstract: Cationic nanofiber membranes are prepared by electrospinning mixed aqueous solution of a cationic polycondensate (CP) and PVA. Apart from being a highly efficient Cr(vi) adsorbent, it can also serve as a convenient method for Cr(vi) determination.

Cited by 3 publications

References 50 publications

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Preparation of Copper Ion Adsorbed Modified Montmorillonite/Cellulose Acetate Porous Composite Fiber Membrane by Centrifugal Spinning

Highly efficient and sustainable cationic polyvinyl chloride nanofibrous membranes for removal of E. coli and Cr (VI): Filtration and adsorption

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