Comparative adsorption of Ni(II) and Cd(II) ions on epichlorohydrin crosslinked chitosan–clay composite beads in aqueous solution

Tirtom, Vedia Nüket; Dinçer, Ayşe; Becerik, Seda; Aydemir, Tülin; Çelik, Ali

doi:10.1016/j.cej.2012.05.059

Cited by 203 publications

(64 citation statements)

References 40 publications

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“…A nanocomposite based on chitosan and montmorillonite was developed as a carrier to improve oral bioavailability of oxytetracycline [20]. Removal of Ni(II) and Cd(II) by adsorption on epichlorohydrin crosslinked chitosan-montmorillonite clay composite beads was observed by Tirtom et al [21].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Biswas

Rashid

Mallik

et al. 2017

International Journal of Polymer Science

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A novel composite material was prepared from prawn shell derived chitosan (CHT) and locally available kaolinite-rich modified Bijoypur clay (MC) using a facile technique in which dilute acetic acid was used as a solvent for dissolving chitosan and composite fabrication whereas distilled water was used for preparing the clay dispersion. Bijoypur clay mainly consists of kaolinite clay mineral and it was modified with the dodecyl amine to make it organophilic. Morphology and properties of the composites (different weight ratio of MC and CHT) have been studied and compared with those of pure CHT and MC. Purification and modification of Bijoypur clay were investigated by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier transformed infrared spectroscopy (FTIR) analyses. The fabrication of CHT-MC composites was confirmed by FTIR analysis. Thermogravimetric analysis (TGA) and differential scanning colorimetry (DSC) were used to investigate the thermal stability of the composites. It was observed that dispersed clay improves the thermal stability and enhances the hardness of the matrix systematically with the increase of clay loading. In this study, a better insolubility in both acidic and alkaline media of the composites is also observed compared to pure chitosan.

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Section: Introductionmentioning

confidence: 99%

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Biswas

Rashid

Mallik

et al. 2017

International Journal of Polymer Science

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“…A strong peak at 1483 cm À1 of HTCC corresponded to the C-H bending of trimethylammonium group, confirming the existence of the quaternary ammonium salt [17][18][19]. It should be also noted that the peak corresponding to the primary amine (1600 cm À1 ) of chitosan disappeared gradually and a new peak at around 1633 cm À1 for HTCC was recorded, revealing the change of the primary amine to the secondary amine structure due to the reactions at -NH 2 sites on the chitosan backbones.…”

Section: Synthesis and Characterization Of Cationic Chitosan (Htcc)mentioning

confidence: 61%

Synthesis of cationic chitosan hydrogel and its controlled glucose-responsive drug release behavior

Zou

Zhao

2015

Chemical Engineering Journal

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“…Normalmente, essa interação é feita pela inserção de moléculas bifuncionais de baixa massa molar ou íons, que promovem a formação de ligações cruzadas entre as cadeias de macromoléculas [4] . Este tipo de modificação pode ser realizado com agentes físicos, como o cálcio [5] e tripolifosfato [6,7] e agentes químicos, tais como: epicloridrina (EP) [8][9][10] , glutaraldeído (GA) [11][12][13][14][15] , N,N-metilenobisacrilamida [16] , genipina (GP) [17,18] , dentre outros.…”

Section: Introductionunclassified

Efeito da modificação química na solubilidade e intumescimento de microesferas à base de goma do cajueiro carboximetilada e quitosana

et al. 2015

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ResumoEsferas de goma do cajueiro carboximetilada e quitosana foram produzidas via complexação polieletrolítica. As esferas foram modificadas quimicamente de modo a obter-se sistemas estáveis em meio ácido e que apresentassem uma resposta de intumescimento diferenciado frente à variação de pH. As esferas foram modificadas por reacetilação da quitosana e por reticulação com epicloridrina, glutaraldeído e genipina. As esferas reticuladas foram caracterizadas por meio de técnicas como: espectroscopia de absorção no infravermelho, análise termogravimétrica, microscopia eletrônica de varredura e quanto à solubilidade em pH 1,2 e ao intumescimento. As esferas de goma do cajueiro carboximetilada e quitosana reacetilada, e as esferas reticuladas com epicloridrina apresentaram baixa resistência à dissolução em pH 1,2. Entretanto, as esferas reticuladas com glutaraldeído e genipina apresentaram resistência à dissolução e baixo coeficiente de difusão. As esferas reticuladas com genipina apresentaram um grau de intumescimento maior do que as esferas reticuladas com glutaraldeído nas concentrações de 3% e 5% (massa/volume). As esferas reticuladas com genipina apresentaram intumescimento responsivo à variação de pH e estabilidade em pH 1,2, indicando que esses sistemas possuem potencial para uso em sistemas de liberação controlada de fármacos por via oral. PalavrasTchave: goma do cajueiro, carboximetilação, quitosana, reticulação. AbstractChitosan/carboxymethylated cashew gum beads were produced via polyelectrolytic complexation. The beads were chemically modified to achieve stable acidic medium and to provide a swelling response in different pH. The beads were modified by chitosan reacetylation and by crosslinking with epichlorohydrin, glutaraldehyde and genipin. The beads were characterized by techniques such as: infrared spectroscopy, thermogravimetry, scanning electron microscopy and regarding their solubility at pH 1.2 and swelling. The beads of carboxymethyl cashew gum and reacetylated chitosan and those crosslinked with epichlorohydrin had low resistances to dissolution at pH 1.2. However, the beads crosslinked with glutaraldehyde and genipin showed resistance to dissolution along with low diffusion coefficients. Moreover, beads crosslinked with genipin presented a higher degree of swelling than beads crosslinked with glutaraldehyde at concentrations of 3% and 5% (weight/volume). Beads crosslinked with genipin presented responsive behavior to pH variation and stability at pH 1.2, indicating that these systems have potential for use in controlled drug delivery systems for oral administration.

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Comparative adsorption of Ni(II) and Cd(II) ions on epichlorohydrin crosslinked chitosan–clay composite beads in aqueous solution

Cited by 203 publications

References 40 publications

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Synthesis of cationic chitosan hydrogel and its controlled glucose-responsive drug release behavior

Efeito da modificação química na solubilidade e intumescimento de microesferas à base de goma do cajueiro carboximetilada e quitosana

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