Chitosan/Ag-Bentonite Nanocomposites: Preparation, Characterization, Swelling and Biological Properties

Abdelkrim, Soumia; Mokhtar, Adel; Djelad, Amal; Bennabi, Farid; Souna, Amina; Bengueddach, Abdelkader; Sassi, Mohamed

doi:10.1007/s10904-019-01219-8

Cited by 42 publications

(17 citation statements)

References 52 publications

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“…Finally, the X-ray diffraction pattern of the non-reticulated CS beads ( Figure 9 ) presented three peaks at 2θ values of 10°, 20°, and 41°, revealing the existence of amorphous regions and high crystallinity. This result is consistent with previous studies reported in the literature [ 23 , 48 , 49 , 50 , 51 ].…”

Section: Resultssupporting

confidence: 94%

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Galan

Trilleras

Zapata

et al. 2021

Life

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The use of dyes at an industrial level has become problematic, since the discharge of dye effluents into water disturbs the photosynthetic activity of numerous aquatic organisms by reducing the penetration of light and oxygen, in addition to causing carcinogenic diseases and mutagenic effects in humans, as well as alterations in different ecosystems. Chitosan (CS) is suitable for removing anionic dyes since it has favorable properties, such as acquiring a positive charge and a typical macromolecular structure of polysaccharides. In this study, the optimization of CS beads crosslinked with glutaraldehyde (GA) for the adsorption of reactive blue dye 4 (RB4) in an aqueous solution was carried out. In this sense, the response surface methodology (RSM) was applied to evaluate the concentration of CS, GA, and sodium hydroxide on the swelling degree in the GA-crosslinked CS beads. In the same way, RSM was applied to optimize the adsorption process of the RB4 dye as a function of the initial pH of the solution, initial concentration of the dye, and adsorbent dose. The crosslinking reaction was investigated by scanning electron microscopy (SEM), Fourier transformed infrared spectroscopy (FTIR), and X-ray diffractometry (XRD). The design described for the swelling degree showed an R2 (coefficient of determination) adjusted of 0.8634 and optimized concentrations (CS 3.3% w/v, GA 1.7% v/v, and NaOH 1.3 M) that were conveniently applied with a concentration of CS at 3.0% w/v to decrease the viscosity and facilitate the formation of the beads. In the RB4 dye adsorption design, an adjusted R2 (0.8280) with good correlation was observed, where the optimized conditions were: pH = 2, adsorbent dose 0.6 g, and initial concentration of RB4 dye 5 mg/L. The kinetic behavior and the adsorption isotherm allowed us to conclude that the GA-crosslinked CS beads’ adsorption mechanism was controlled mainly by chemisorption interactions, demonstrating its applicability in systems that require the removal of contaminants with similar structures to the model presented.

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Section: Resultssupporting

confidence: 94%

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Galan

Trilleras

Zapata

et al. 2021

Life

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“…The band observed at 1793.28 cm −1 denotes formation of the acyl halide group stretching band (C=O). The NH 2 bending vibration of amide II and C=O (amide I) group was observed at 1648.28–1646.2 cm −1 48 . Further bands formed between 1551.1 and 1556 cm −1 corresponds to N−H bending vibrations of amide II band of the −CONH− group.…”

Section: Resultsmentioning

confidence: 94%

“…Formation of different stretching vibrational large bands between 3444.7 and 3400 cm −1 indicate overlapping of OH and NH 2 groups 44 . ‐ 46 The peak observed at 2926.86 and 2888.05 cm −1 of snail and crab assigned to the stretching vibration of alkane group (−CH, CH 2 , CH 3 ) indicating the presence of single bond 39 , 44 , 47 , 48 . The band observed at 1793.28 cm −1 denotes formation of the acyl halide group stretching band (C=O).…”

Section: Resultsmentioning

confidence: 98%

“…[44][45][46] The peak observed at 2926.86 and 2888.05 cm −1 of snail and crab assigned to the stretching vibration of alkane group (−CH, CH 2 , CH 3 ) indicating the presence of single bond. 39,44,47,48 The band observed at 1793.28 cm −1 denotes formation of the acyl halide group stretching band (C=O peak at 1597 cm −1 suggests existence of the effective deacetylation process. 49 Furthermore, the band observed in the region 1466.4 cm −1 indicate deformed (symmetrical and asymmetrical) bending vibrations of methyl groups whereas 1414.9-1414 cm −1 suggest C−H bending vibrations of the CH 2 group.…”

Section: Ftir Studies Of Chitosanmentioning

confidence: 99%

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Purification, characterization, immobilization and kinetic studies of catalase from a novel sourceSechium edule

Takio

Yadav

Barman

et al. 2020

Int J of Chemical Kinetics

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A catalase from a novel source Sechium edule (squash) has been purified to homogeneity using ammonium sulfate fractional precipitation, dialysis, and anion exchange chromatography on Diethylaminoethyl (DEAE) cellulose in sodium acetate buffer pH 6.0. The purity of the enzyme was analyzed by SDS-PAGE. The molecular weight of the enzyme using the SDS-PAGE method was found to be 55 kDa with specific activity 6.35 U/mg. The molecular weight of the enzyme was further confirmed by the INTACT mass spectrometric technique and found to be 52.5 kDa. The Reinheitzahl (Rz) value of the enzyme was 1.5. The MALDI-TOF analysis of the purified enzyme showed that it contains 529 amino acid residues. The K m , V max, optimum pH, and optimum temperature of the free enzyme using H 2 O 2 as the substrate were found to be 0.03 mM, 200 μmol/min, 7.6, and 24 • C, respectively. The purified enzyme was immobilized on chitosan beads which was prepared by extracting the chitosan from Cornu aspersum (garden snail) having highest degree of deacetylation%. The kinetic characteristics, K m , V max, optimum pH, and optimum temperature of the immobilized catalase were found to be 0.065 mM, 250 μmol/min, 7.6, and 41 • C, respectively. The immobilized catalase is more thermostable in comparison to free catalase.

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“…To enhance properties of these composites including physiochemical and adsorption capability, some various materials such as montmorillonite [38], bentonite [39], alumina [40], kaolin [41], and zeolite [42] have been used in their preparation. HZSM-5 zeolite by reason of some properties like low priced, diversity of structural properties, good mechanical firmness, high surface area, and high adsorption valence towards cation species was utilized as a solo adsorbent or composite in the water pollutants removal [43].…”

Section: Introductionmentioning

confidence: 99%

Preparation of CoFe2O4@Carboxymethylcellulose/HZSM-5 as a Novel Nano Magnetic Adsorbent for Metronidazole Removal: Isotherm, Kinetic and Thermodynamic Study

Nasiri

Heidari

Javid

et al. 2021

Preprint

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In this research CoFe2O4@CMC/ HZSM-5 synthesized in the presence of Carboxymethylcellulose as a biopolymer in the green conditions as a new nanomagnetic adsorbent for metronidazole removal from aqueous media. Physical and chemical structure of adsorbent was investigated by FTIR, FESEM, EDS, Mapping, TEM, XRD, VSM, BET and TGA techniques. The results indicated that 94% of the metronidazole concentration removed by CoFe2O4@CMC/HZSM-5 in the optimal conditions including pH 6, temperature 20oC, metronidazole concentration 50 mg/L, contact time 60 min and adsorbent dose 2 g/L. The resulting data from adsorption experimental experiments had better correlated with the Freundlich isotherm and pseudo-second order kinetic. Also, the thermodynamic study demonstrated that the adsorption process was an endothermic process and had a physical mechanism. As well as, the achieved findings demonstrated that following six adsorption runs, the adsorbent chemical structure had no change and the nanomagnetic adsorbent efficiency in the removal process had a slight decrease. CoFe2O4@CMC/HZSM-5 magnetic nanocomposite had effective adsorption capacity for metronidazole removal.

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Chitosan/Ag-Bentonite Nanocomposites: Preparation, Characterization, Swelling and Biological Properties

Cited by 42 publications

References 52 publications

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Optimization of Chitosan Glutaraldehyde-Crosslinked Beads for Reactive Blue 4 Anionic Dye Removal Using a Surface Response Methodology

Purification, characterization, immobilization and kinetic studies of catalase from a novel sourceSechium edule

Preparation of CoFe2O4@Carboxymethylcellulose/HZSM-5 as a Novel Nano Magnetic Adsorbent for Metronidazole Removal: Isotherm, Kinetic and Thermodynamic Study

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