Heterocyclic modification of chitosan for the adsorption of Cu (II) and Cr (VI) ions

Anush, S.M.; Vishalakshi, B.; Chandan, H.R.; Geetha, Banda

doi:10.1080/01496395.2018.1442859

Cited by 24 publications

(4 citation statements)

References 28 publications

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“…The dimensionless parameter R L (eq ) can be calculated from the Langmuir constant b , which gives the favorable nature of adsorption where C o and b are the initial concentration of Eu(III) and the Langmuir constant, respectively. The separation factor R L value higher than unity indicates unfavorable adsorption, while an R L value of zero indicates the irreversible adsorption process. , The calculated R L value (0.6818) for the adsorption of Eu(III) lies between 0 and 1, which indicates that the adsorption process is favorable. The linearized Freundlich isotherm was also utilized to study the adsorption process through the equation as where C e (mg L –1 ) is the equilibrium concentration of Eu(III) and q e (mg g –1 ) is the amount adsorbed at equilibrium.…”

Section: Resultsmentioning

confidence: 95%

“…The separation factor R L value higher than unity indicates unfavorable adsorption, while an R L value of zero indicates the irreversible adsorption process. 42,43 The calculated R L value (0.6818) for the adsorption of Eu(III) lies between 0 and 1, which indicates that the adsorption process is favorable. The linearized Freundlich isotherm 42 was also utilized to study the adsorption process through the equation as…”

Section: ■ Results and Discussionmentioning

confidence: 96%

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Cellulose and Saccharomyces cerevisiae Embark To Recover Europium from Phosphor Powder

et al. 2019

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The mounting demand for rare earth elements (REEs) and the similarities in their chemical and physical properties render their separation and selective recovery quite challenging. Microbe-based adsorbents are quite effective owing to their diverse functional groups on the cell wall and are perceived to be environmentally benign. This work reports the application of yeast (Saccharomyces cerevisiae) embedded in cellulose matrix as an efficient adsorbent for the separation of Eu(III) from aqueous medium. The fungi–biopolymer combination acts as a good host to welcome Eu(III) on its surface through effective coordination with the diverse functional groups. The pH, adsorbent dosage, isotherm studies, and thermodynamic and kinetic parameters were studied, and the characterization was done using FT-IR, XRD, XRF, XPS, SEM-EDX, BET, and confocal microscopy techniques. Ion chromatography was used to monitor the quantitative measurement of Eu(III) during the course of adsorption and desorption process. The regeneration of the biosorbent was achieved using EDTA as the complexing agent for Eu(III). The biosorbent gives a maximum adsorption capacity of 25.91 mg g–1 through Langmuir isotherm model. Further, the biosorbent was employed to recover Eu(III) from a phosphor powder containing other rare earths as well as phosphor powder from a spent fluorescent lamp.

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Section: Resultsmentioning

confidence: 95%

Section: ■ Results and Discussionmentioning

confidence: 96%

Cellulose and Saccharomyces cerevisiae Embark To Recover Europium from Phosphor Powder

et al. 2019

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“…(10) (11) where K c is the equilibrium constant obtained from Equation ( 12): Chitosan cross-linked with epichlorohydrin 35.5 [35] Xanthate altered magnetic chitosan 34.5 [36] Ethylenediamine modified chitosan 38.0 [29] Chitosan modified with cellulose 13.05 26.50 [37] Chitosan/cotton fibers 24.78 [38] Chitosan modified with PVA 47.83 [39] Chitosan-coated cotton gauze 12.4 14.1 [40] Calcium(II)-chitosan microspheres 41.5 [41] Chemically altered chitosan 43.47 [42] Ethylenediamine cross-linked and magnetic chitosan resin 51.8 [43] Magnetic chitosan nanoparticles 55.80 [44] Chitosan-biochar/g-Fe 2 O 3 composite (CMB) 167.31 [45] Heterocyclic alteration of chitosan 85.0 83.75 [46] Chitosan modified with PVA incorporated with g-C 3 N 4 166.66 142. 45 Present study (12) where q e , C e havetheir meanings as defined earlier.…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Graphitic C3N4 incorporated chitosan-poly(vinyl alcohol) blend nanocomposites for the removal of Cu(II) and Cr(VI) ions from aqueous solutions

Anush,

Naga Raju,

Gayathri

et al. 2024

Express Polym. Lett.

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The rapidly increasing human population and their needs have led to increased industrialization. Effluents from the industries led to increased environmental pollution, creating serious environmental issues. Effluents contain numerous heavy metal ions, which are highly toxic and debilitating to humans as well as other living organisms. Effluents from the industries become an on-pressing issue as the toxic metal ions and the dye contents get mixed and further cause major environmental issues [1-3]. These heavy metals are of severe risk since they can show toxicity at minute concentrations and are mainly not degraded by natural processes [4,5].Copper is one of the toxic metal ions that have been used by various industries for the production of materials such as paper, leather, petroleum refining, etc. Chromium ion pollution is a result of events of nature,

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“…Among various materials as adsorbents, chitosan (CS) as a natural material has drawn a significant attention for real application due to its abundance, antibacterial, high affinity toward dyes and metals, biodegradability and good biocompatibility. In recent years, using CS and its blends as adsorbents has been extensively investigated for the removal of metals [27][28][29] , but its application for fluoride adsorption is rare. CS has high solubility in acid, thus, it cannot be directly used as an adsorbent for ??…”

Section: Introductionmentioning

confidence: 99%

Synthesizing a Novel Zr/Fe/Al-Incorporated Cross-linked Chitosan as Absorbent for Effective Removal of Fluoride from Aqueous Solution

Zhang

et al. 2021

Water Air Soil Pollut

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Fe/Al/Zr modified chitosan beads was synthesized in this study as a potential adsorbent to adsorb fluoride from water. Series of adsorption experiments were carried out to test the fluoride removal performance of the new adsorbent and probe its adsorption mechanism. It was found that an adsorption capacity of 36.04 mg fluoride /g Chitosan beads was achieved in the conditions with pH at 6.0, 1.6 g/L of the dosage of CS-ZFA, 60 mg/L of initial concentration of fluoride, and 120 min adsorption time. The adsorption kinetics followed a pseudo-second-order model, and the adsorption isotherm can be described by the Freundlich isotherm model. Furthermore, various characterization methods were adopted to characterize the prepared adsorbent. Based on the characterization, the high adsorption capacity of the newly synthesized adsorbent is due to the electrostatic attraction and the formation of CS-ZFA-F complex.

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Heterocyclic modification of chitosan for the adsorption of Cu (II) and Cr (VI) ions

Cited by 24 publications

References 28 publications

Cellulose and Saccharomyces cerevisiae Embark To Recover Europium from Phosphor Powder

Cellulose and Saccharomyces cerevisiae Embark To Recover Europium from Phosphor Powder

Graphitic C3N4 incorporated chitosan-poly(vinyl alcohol) blend nanocomposites for the removal of Cu(II) and Cr(VI) ions from aqueous solutions

Synthesizing a Novel Zr/Fe/Al-Incorporated Cross-linked Chitosan as Absorbent for Effective Removal of Fluoride from Aqueous Solution

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