Application of chitosan-citric acid nanoparticles for removal of chromium (VI)

Bagheri, Mahdiye; Younesi, Habibollah; Hajati, Shaaker; Borghei, Seyed Mehdi

doi:10.1016/j.ijbiomac.2015.07.022

Cited by 85 publications

(19 citation statements)

References 38 publications

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“…The ATR‐IR spectra of the neat chitosan demonstrated the characteristic bands of chitosan, with a broad band from 3627 to 2981 cm −1 related to the OH and NH stretching vibrations (see Figure ) . The small signal at 2857 cm −1 present because of CH stretching bands.…”

Section: Resultsmentioning

confidence: 95%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

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Citric acid (CA)-modified hydrogels from corn starch and chitosan were synthesized using a semidry condition. This strategy has great benefits of friendly environment because of the absence of organic solvents and compatible with the industrial process. The hydrogel blends were prepared with starch/chitosan ratios of 75/25, 50/50, and 25/75. The thermal stability, morphology, water absorption, weight loss in water, and methylene blue absorption were determined. Multi-carboxyl structure of CA could result in a chemical cross-linking reaction between starch, chitosan, and CA. The cross-linking reaction between free hydroxyl groups of starch, amino groups of chitosan, and carboxyl groups of CA has been confirmed by attenuated total reflectance infrared (ATR-IR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) analysis. The water absorption properties of CA-modified hydrogel blends were increased significantly compared with the native starch and chitosan. Moreover, the hydrogel blends modified with CA showed good water resistance and gel content. The morphology study confirmed the complete chemical cross-linking and porous structure of hydrogel blends. The hydrogel blend with the starch/chitosan ratio of 50/50 presented powerful absorption of methylene blue as well as chemical cross-linking reaction and dense structure. In sum, the hydrogel blend comprising 50% starch and 50% chitosan has the potential to be applied for water maintaining at large areas, for example, in agriculture. K E Y W O R D S chitosan, citric acid, crosslinking, hydrogel, starch 1 | INTRODUCTION Hydrogels are extremely hydrophilic polymer networks, either synthetic (petrochemical based) or natural (biopolymers), which are usually stabilized through covalent bonds or noncovalent interactions among the macromolecule chains known as cross-linking. 1-4 Hydrogels will swell when placed in water and can retain an extensive fraction of water within their spatial structures without dissolving. 5 A gel structure forms within the polymer melt after cross-linking. Currently, a wide range of natural polymer hydrogels such as starch, chitosan, collagen, and cellulose have been described as suitable biomaterials for pharmaceutical and biomedical applications because of their biocompatibility, low-toxicity, and biodegradability. 6-10Starch and its derivatives have attracted many researchers for expanding biopolymer industries since they are cost-effective, renewable, abundant in nature, and biodegradable. 11-14 However, some limitations exist in the properties of starch including poor mechanical properties, high hydrophilicity, fragility, and poor dimensional stability. [15][16][17][18][19] To improve the quality and also broaden the application areas of starch, these drawbacks need to be reduced significantly.Chitosan, isolated from chitin, is another polysaccharide that is abundant in nature and available in large quantities. Chitosan is biocompatible, biodegradable, biofunctional, and antimicrobial. [20][21][22] Mo...

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Section: Resultsmentioning

confidence: 95%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

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“…The loss of twin absorption into sharp absorption was at 1650 cm -1 which was C=O group from carboxylate chain. In the citric acid crosslinked chitosan result, there was no peak which showed -NH or -NH2 group, but C=O group from citric acid showed up [16,19].…”

Section: Hep Grafting Reaction On Surface Membranementioning

confidence: 97%

Grafting of Heparin on Blend Membrane of Citric Acid Crosslinked Chitosan/Polyethylene Glycol-Poly Vinyl Alcohol (PVA-PEG)

et al. 2019

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Heparin, an active sulfate group material, grafted onto blend membrane citric acid cross-linked chitosan/poly (vinyl alcohol)-poly(ethylene glycol) (PVA-PEG) to improve the membrane properties. The physical tests shown that grafting reaction of citric acid crosslinked chitosan increased the mechanical strength and membrane swelling. The permeability test results, it was found that the grafted chitosan membrane was improved permeability of both urea and creatinine as compared to chitosan pure and chitosan crosslinked membrane. The negative charge of the sulphonate group of heparin increased the number of the active side of the carrier in the membrane, which then correlated to the membrane’s permeability process.

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“…Hence, in recent years, the scientists have been involved in a number of studies focusing on the effective removal of lead ions from aqueous solutions. To this end, the membrane systems, chemical precipitation, ion exchange, filtration, electrolytic methods, chemical precipitation, adsorption, and electrodeposition have been utilized . The cost of these methods is usually high.…”

Section: Introductionmentioning

confidence: 99%

Nanodiamond‐containing polyethyleneimine hybrid materials for lead adsorption from aqueous media

Çi̇ği̇l

Urucu

Kahraman

2019

J of Applied Polymer Sci

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This study describes the preparation of new surface‐modified nanodiamond (ND) particles containing urethane‐based hybrid materials by photopolymerization of aliphatic urethane acrylate, trimethylolpropane triacrylate, glycidyl methacrylate monomers, and their usage for lead adsorption from aqueous media. ND and synthesized surface‐modified ND were characterized by atom transfer radical addition Fourier transform infrared spectroscopy (ATR‐FTIR) and scanning transmission electron microscopy analysis. Crosslinked adsorbent nanocomposites were then treated with polyethylene imine and all adsorbent nanocomposites were characterized by ATR‐FTIR, scanning electron microscopy, thermogravimetric analysis, and contact angle measurements. The metal ion binding capacity of the surfaces of the nanocomposites containing high amine content was investigated. The effects of the percentage of functional monomer, pH, and contact time on adsorption, and the interaction of foreign metal ions have been tested. Optimum contact time was found to be 7 h at pH 5. The adsorption capacity of the synthesized nanocomposite adsorbent for lead (II) was determined as 17.12 mg g−1. Langmuir and Freundlich isotherms were used to determine the adsorption behaviors and Langmuir isotherm model was found to be the most suitable model (R2: 0.9988). The amount of adsorption of Pb (II) ions of UV curable adsorbent film prepared in river water samples was investigated. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48241.

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Application of chitosan-citric acid nanoparticles for removal of chromium (VI)

Cited by 85 publications

References 38 publications

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Grafting of Heparin on Blend Membrane of Citric Acid Crosslinked Chitosan/Polyethylene Glycol-Poly Vinyl Alcohol (PVA-PEG)

Nanodiamond‐containing polyethyleneimine hybrid materials for lead adsorption from aqueous media

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