Chitosan-terephthaldehyde hydrogels – Effect of concentration of cross-linker on structural, swelling, thermal and antimicrobial properties

Raju, Liju; Lazuli, A R Stesho Crystalin; Prakash, N.; Rajkumar, Eswaran

doi:10.1016/j.mtla.2021.101082

Cited by 22 publications

(7 citation statements)

References 33 publications

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“…Hence, chitosan loses considerable weight. 50 However, the onset temperature of the ZnO/composite beads in this range increased from 250 to 275 °C. Therefore, coating the composite beads with ZnO particles increased the thermal stability of the beads.…”

Section: Resultsmentioning

confidence: 89%

“…The protonated amine groups (–NH 3 + ) and hydroxyl groups (–OH 2 + ) of chitosan at pH 4 formed favorable electrostatic interactions with the anionic groups (–SO 3 − ) of the dye molecules. 50 Moreover, hydrogen bonding between oxygen, nitrogen, and hydrogen atoms on dye molecules and chitosan beads led to the chemisorption between the dye molecules and the active site of the beads ( Fig. 7(a) ).…”

Section: Resultsmentioning

confidence: 99%

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Composite beads from chitosan and zeolitic imidazolate framework-8 for the adsorption and photocatalytic degradation of reactive red 141

et al. 2023

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Composite beads from chitosan and zeolitic imidazolate framework-8 for the adsorption and photocatalytic degradation of reactive red 141

et al. 2023

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“…Figure 5b shows the stress-strain curves of the GO−ATP@CS−PVA at a compression rate of 1 mm/min. No plastic deformation of the aerogel occurred at a compression strain of 60.6%, and the aerogel recovered rapidly after removal of the external pressure, attributed to its good network structure [31], which gives the aerogel a unique resilience; the aerogel additionally has excellent mechanical properties. The swelling properties are an important factor affecting the utility of aerogels in the field of adsorption [32].…”

Section: Characterization Results and Analysismentioning

confidence: 99%

Study on Preparation of Chitosan/Polyvinyl Alcohol Aerogel with Graphene−Intercalated Attapulgite(GO−ATP@CS−PVA) and Adsorption Properties of Crystal Violet Dye

Sun

Chen

2022

Nanomaterials

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Adsorption is one of the effective methods of treating dye wastewater. However, the selection of suitable adsorbent materials is the key to treating dye wastewater. In this paper, GO−ATP was prepared by an intercalation method by inserting graphene oxide (GO) into the interlayer of alabaster attapulgite (ATP), and GO−ATP@CS−PVA aerogel was prepared by co−blending−crosslinking with chitosan (CS) and polyvinyl alcohol (PVA) for the adsorption and removal of crystalline violet dye from the solution. The physicochemical properties of the materials are characterized by various methods. The results showed that the layer spacing of the GO−ATP increased from 1.063 nm to 1.185 nm for the ATP, and the specific surface area was 187.65 m2·g−1, which was 45.7% greater than that of the ATP. The FTIR results further confirmed the success of the GO−ATP intercalation modification. The thermogravimetric analysis (TGA) results show that the aerogel has good thermal stability properties. The results of static adsorption experiments show that at 302 K and pH 9.0, the adsorption capacity of the GO−ATP@CS−PVA aerogel is 136.06 mg·g−1. The mass of the aerogel after adsorption−solution equilibrium is 11.4 times that of the initial mass, with excellent adsorption capacity. The quasi−secondary kinetic, Freundlich, and Temkin isotherm models can better describe the adsorption process of the aerogel. The biobased composite aerogel GO−ATP@CS−PVA has good swelling properties, a large specific surface area, easy collection and a low preparation cost. The good network structure gives it unique resilience. The incorporation of clay as a nano−filler can also improve the mechanical properties of the composite aerogel.

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“…Antimicrobial activity of chitosan, 2-HyA-CS and 2-HyA-CS/ZnO, along with penicillin G (antibacterial), fluconazole (anticandidal) as positive control and negative control DMSO were tested against variety of pathogenic bacteria (Bacillus cereus ATCC6633 and S. aureus ATCC25923 as Gram-positive, E. coli ATCC25922, Pseudomonas aeruginosa ATCC27853 as Gram-negative and C. albicans ATCC10231 as yeast stain) The technique of inhibition zone was used. 62,63 The result was shown in Figure 12…”

Section: Anti-microbial Activitymentioning

confidence: 99%

Synthesis of novel chitosan Schiff base and its ZnO nanocomposite for removal of synthetic dye, antimicrobial, and cytotoxicity activity

Gaafar

El‐Taweel

Fouda

et al. 2022

Journal of Bioactive and Compatible Polymers

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In this work, a novel chitosan Schiff base 4-(2-Hydroxyaniline)pent-3-en-2-one chitosan (2-HyA-CS) and its ZnO nanocomposite (2-HyA-CS/ZnO) were sensitized and characterized by appropriate methods; FTIR, XRD, Elemental analysis, SEM, TEM and TGA. The result of characterization methods confirms the preparation of 2-HyA-CS and 2-HyA-CS/ZnO. The SEM images reveal that chitosan, 2-HyA-CS, and 2-HyA-CS/ZnO have a varied roughness and porous surfaces. The reason for this difference was attributed to the formation of Schiff base 2-HyA-CS and the presence of ZnO nanoparticles in 2-HyA-CS/ZnO. The patterns of XRD and FTIR confirm the formation of 2-HyA-CS and 2-HyA-CS/ZnO. The degree of substitution (DS) of modified chitosan 2-HyA-CS was calculated using Elemental analysis and FTIR.ATR, it was found to be 74%. The adsorption efficiency of the produced adsorbents was compared with pure chitosan to remove of Remazol Brilliant Blue R (RBBR) from an aqueous medium and antimicrobial activity. The removal percentage of RBBR by chitosan, 2-HyA-CS, and 2-HyA-CS/ZnO are 47.12%, 91.9%, and 96.56%, respectively with the following order: 2-HyA-CS/ZnO > 2-HyA-CS > chitosan. Their antimicrobial activities were studied against two Gram negative bacteria ( E. coli and P. aeruginosa), two Gram positive bacteria ( S. aureus and B. cereus) and ( C. albicans) as a yeast strain, the inhibitory zone measurements revealed that the activity of 2-HyA-CS/ZnO is excellent and higher than 2-HyA-CS and pure chitosan. The cytotoxicity of the prepared compound 2-HyA-CS and 2-HyA-CS/ZnO along with pure chitosan was estimated against two human cancer cells MCF-7 cells and HepG-2 cells, the result indicates that 2-HyA-CS/ZnO having higher Inhibitory activity against both MCF-7 and HepG-2 cells with 53.5 ± 2.86 and 27.4 ± 1.23 µg/mL respectively and 2-HyA-CS possessing moderate Inhibitory activity against both MCF-7 and HepG-2 cancer cells with IC50 = 216.5 ± 7.48 and 135.6 ± 6.49 µg/ml respectively.

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Chitosan-terephthaldehyde hydrogels – Effect of concentration of cross-linker on structural, swelling, thermal and antimicrobial properties

Cited by 22 publications

References 33 publications

Composite beads from chitosan and zeolitic imidazolate framework-8 for the adsorption and photocatalytic degradation of reactive red 141

Composite beads from chitosan and zeolitic imidazolate framework-8 for the adsorption and photocatalytic degradation of reactive red 141

Study on Preparation of Chitosan/Polyvinyl Alcohol Aerogel with Graphene−Intercalated Attapulgite(GO−ATP@CS−PVA) and Adsorption Properties of Crystal Violet Dye

Synthesis of novel chitosan Schiff base and its ZnO nanocomposite for removal of synthetic dye, antimicrobial, and cytotoxicity activity

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