Layered Clay-Alginate Composites for the Adsorption of Anionic Dyes: A Biocompatible Solution for Water/Wastewater Treatment

Sebastian, Sanil; Mayadevi, S.; Beevi, B. Sajeena; Mandal, Sujata

doi:10.4236/jwarp.2014.63023

Cited by 18 publications

(6 citation statements)

References 17 publications

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“…The composites and nanocomposite of polymer-clay have been gaining increase attention by researchers globally due to the hybrid properties which they exhibit when compared with either the polymer or clay separately [8]. A wide range of polymer-clay composite/nanocomposite has been produced and used for a variety of applications such as water treatment [5,8], dye adsorption [2,[9][10][11], etc.…”

Section: Introductionmentioning

confidence: 99%

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Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Zauro

Vishalakshi

2017

Int J Ind Chem

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A terpolymer gel, Gellan gum-graft-poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-dimethylaminopropyl methacrylamide) and its composite with the clay, Montmorillonite, was prepared by free-radical polymerization and crosslinking reactions in solution. The terpolymer gel and the clay composite were characterized using FTIR, TGA, SEM, and X-ray diffraction techniques. Swelling studies were carried out in different pH and salt solutions. The gel showed maximum swelling capacity in alkaline medium, while the composite showed higher swelling in neutral medium. The swelling of the gel and the composite followed second kinetics model and water transport is found to be a less Fickian diffusion process. The terpolymer gel and the composite were evaluated for the adsorption of rhodamine B (RhB) and chromotrope 2R (C2R) dyes. Rhodamine B is found to be adsorbed to a higher extent than chromotrope 2R and the adsorption isotherm studies suggested that adsorption of both RhB and C2R on the terpolymer gel was best explained by Langmuir model, while the adsorption on the Composite fitted best into Freundlich model. Similarly, the adsorption kinetics data for both RhB and C2R dyes followed the second-order kinetics.

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Section: Introductionmentioning

confidence: 99%

“…A wide range of polymer-clay composite/nanocomposite has been produced and used for a variety of applications such as water treatment [5,8], dye adsorption [2,[9][10][11], etc.…”

Section: Introductionmentioning

confidence: 99%

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Zauro

Vishalakshi

2017

Int J Ind Chem

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“…Those values are smaller compared to other polymer-clay composite presented in previous work reflecting water absorbency. [21][22][23][24] The lower water absorbency of alginate-modified saponite compared with saponite is due to prevention the dissolution of the hydrophilic polymer chains from alginate structure in an aqueous medium as also found in the alginate/2-hydroxyethyl methacrylate (HEMA)/clay and alginate-g-Poly(sodium acrylate)/Kaolin 23,24 . This phenomenon can be affected by small percentage of alginate in the polymer-clay formation.…”

Section: Resultsmentioning

confidence: 99%

Alginate-Modified Saponite and Study for Ureaslow Released Fertilizer Application

Faishol¹,

Rubiyanto²,

Chuenchom³

et al. 2019

RJC

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Preparation on polymer-modified clay of alginate-saponite composite for urea slow-released fertilizer application has been conducted. The material was prepared by intercalating alginate into saponite structure followed by composite formation using urea. Material characterization was performed by x-ray diffraction, gas sorption analysis, and Fourier-Transform Infra-Red (FTIR) spectroscopy. Swelling, diffusion and network parameters of the composite were studied. The results indicated that the increasing physicochemical character was found as identified by the increasing basal spacing d 001 of saponite as well as increasing specific surface area after intercalation and composite formation. The increasing water sorption and urea adsorption rate were obtained by the modification. Study on the effect of pH on urea desorption rate composites showed that the kinetics are fit with Ritger-Peppas, first-order desorption and Higuchi models. The higher acidity enhances the rate of urea desorption. By Ritger-Peppas model, n values of desorption kinetics at all pH variation are at the range of 0.81-0.91 The values describe that the release mechanism is controlled by the diffusion and relaxation rate and it depends on water migration and urea diffusion.

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“…By comparing the acidic and basic pH ranges, the adsorption capacity was found to be high at the acidic rather than in the basic. This may be due to the presence of positively charged ammonium ions present on the surface of the synthesized adsorbent at acidic pH . Since the surface of the adsorbent becomes positively charged, it attracts the negatively charged chromate ions toward itself electrostatically.…”

Section: Resultsmentioning

confidence: 99%

Functional Ionic Liquid-Capped Graphene Quantum Dots for Chromium Removal from Chromium Contaminated Water

et al. 2018

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New functional ionic liquid (IL) capped graphene quantum dot (GQD) was synthesized as an adsorbent for the removal of toxic heavy metal chromium(VI) ion (Cr 6+ ). The physicochemical properties of the adsorbent (IL-GQD) were investigated by Fourier transform infrared, Xray diffraction, atomic force microscopy, Raman, scanning electron microscopy, energy dispersive X-rays, and transmission electron microscopy analyses. The adsorption parameters, namely equilibrium time, solution pH, competing co-ions, dosage, and initial chromium concentration, were optimized for maximum Cr 6+ adsorption. The maximum adsorption capacity reached 934.62 mg/g at 40 min in neutral pH; this is much better than most of the other adsorbents reported earlier. In addition, the effect of pH in solution was investigated in the range of 3.0−12.0. The result showed that the lower pH value was found to favor the adsorption. The adsorption kinetics and isotherms fitted well with Langmuir isotherm model and pseudo-second-order kinetic model. The thermodynamic studies indicated that the chromium adsorption process followed a spontaneous and endothermic model. This new functionalization of ionic liquid moieties into graphene quantum dot provides excellent results for the removal of toxic Cr 6+ . This can be utilized for field applications to reduce the chromium concentration to below the tolerance limit (>0.05 mg L −1 ).

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Layered Clay-Alginate Composites for the Adsorption of Anionic Dyes: A Biocompatible Solution for Water/Wastewater Treatment

Cited by 18 publications

References 17 publications

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Alginate-Modified Saponite and Study for Ureaslow Released Fertilizer Application

Functional Ionic Liquid-Capped Graphene Quantum Dots for Chromium Removal from Chromium Contaminated Water

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