Effect of heparin coating on epichlorohydrin cross-linked chitosan microspheres on the adsorption of copper (II) ions

Coelho, Thalia Camila; Laus, Rogério; Mangrich, Antônio S.; Fávere, Valfredo T.; Laranjeira, Mauro C. M.

doi:10.1016/j.reactfunctpolym.2007.02.009

Cited by 81 publications

(52 citation statements)

References 22 publications

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“…A peak around 1,006 cm −1 is related to the C-O stretching of CS, which has overlapped with Ppy. 29,54,55 The FTIR spectrum of Ppy/ZnO/CS film showed that the peaks observed in the spectrum of Ppy/CS composite (at 1,708 and 1,320 cm −1 ) have shifted to 1,654 and 1,362 cm −1 , respectively. A similar shift was reported in the literature and was attributed to the formation of Ppy/ZnO/ CS complexes.…”

Section: Resultsmentioning

confidence: 99%

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Ebrahimiasl¹,

Zakaria²,

Kassim³

et al. 2014

IJN

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An antibacterial and conductive bionanocomposite (BNC) film consisting of polypyrrole (Ppy), zinc oxide (ZnO) nanoparticles (NPs), and chitosan (CS) was electrochemically synthesized on indium tin oxide (ITO) glass substrate by electrooxidation of 0.1 M pyrrole in aqueous solution containing appropriate amounts of ZnO NPs uniformly dispersed in CS. This method enables the room temperature electrosynthesis of BNC film consisting of ZnO NPs incorporated within the growing Ppy/CS composite. The morphology of Ppy/ZnO/CS BNC was characterized by scanning electron microscopy. ITO–Ppy/CS and ITO–Ppy/ZnO/CS bioelectrodes were characterized using the Fourier transform infrared technique, X-ray diffraction, and thermogravimetric analysis. The electrical conductivity of nanocomposites was investigated by a four-probe method. The prepared nanocomposites were analyzed for antioxidant activity using the 2,2-diphenyl-1-picrylhydrazyl assay. The results demonstrated that the antioxidant activity of nanocomposites increased remarkably by addition of ZnO NPs. The electrical conductivity of films showed a sudden decrease for lower weight ratios of ZnO NPs (5 wt%), while it was increased gradually for higher ratios (10, 15, and 20 wt%). The nanocomposites were analyzed for antibacterial activity against Gram-positive and Gram-negative bacteria. The results indicated that the synthesized BNC is effective against all of the studied bacteria, and its effectiveness is higher for Pseudomonas aeruginosa . The thermal stability and physical properties of BNC films were increased by an increase in the weight ratio of ZnO NPs, promising novel applications for the electrically conductive polysaccharide-based nanocomposites, particularly those that may exploit the antimicrobial nature of Ppy/ZnO/CS BNCs.

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Section: Resultsmentioning

confidence: 99%

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Ebrahimiasl¹,

Zakaria²,

Kassim³

et al. 2014

IJN

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“…Of all these methods, adsorption method is simple and relatively cost-effective. Bio-sorption is a promising techniques for the adsorption of heavy metals from aqueous environments especially when adsorbents are derived from lignocelluloses carbonaceous materials, natural resources, plant wastes, agricultural wastes (Orhan and Buyukgungar, 1993;Coelho et al,2001;Babarinde, 2002;Muranoon and Sastre,1999;Olaofe and Bosch1980).…”

Section: Introductionmentioning

confidence: 99%

Kinetic Studies of Adsorption of Heavy Metals on Clays

Olaofe¹,

Akanji²,

Adamolugbe³

et al. 2014

IJC

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Kinetic studies of adsorption of heavy metals (Pb (II), Cu(II), Cd(II) and Zn(II)) on local clay soils from four different locations in Ekiti state have been studied using static batch experimental method. The major factors affecting the heavy metal ions sorption on local clays were investigated. The experimental data were correlated with adsorption isotherm and kinetic equations using linear regression analysis. The plots of the amount of adsorbate adsorbed against equilibrium concentration or mass of dosage of clay or time showed two distinct segments. Firstly, nearly a straight line plot at low concentration and secondly a flat or plateau portion at high concentration were observed. The monolayer concentration of the adsorbent was calculated. Langmuir isotherm was found to correlate the adsorption data better than the Freundlich isotherm. The parameters in these isotherms were evaluated and fully discussed. The adsorption kinetic data were correlated with three functions. The Olaofe proposed function (R 2 = 97.5 -99.0 %) was found to be the best followed by Simple Elovich function (R 2 = 84.5 -95.9 %) and the least was the power function (R 2 = 84.3 -93.1%) .The parameters in the functions and statistical data were reported and fully discussed. The present report has shown that local raw Nigerian clays can be used as adsorbents.

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“…Because cross-linkers like glutaraldehyde (Dzul Erosa, Saucedo Medina, Navarro Mendoza, Avila Rodriguez, & Guibal, 2001;Ruiz, Sastre, & Guibal, 2000;Webster, Halling, & Grant, 2007) and epichlorohydrin (Coelho, Laus, Mangrich, de Fávere, & Laranjeira, 2007) would weaken the adsorption efficiency of chitosan, the insertion of cross-linking agent with functional groups into chitosan becomes an effective way to get resins with good adsorption capacity. Thiourea has been proved to be a good material to modify chitosan and improve its adsorption ability for many heavy metals (Birinci, Gülfen, & AydIn, 2009;Donia, Atia, & Elwakeel, 2007;Guibal, Vincent, & Mendoza, 2000;Zhou, Wang, Liu, & Huang, 2009).…”

Section: Introductionmentioning

confidence: 99%

Studies on adsorption behavior of Pb(II) onto a thiourea-modified chitosan resin with Pb(II) as template

Lin

Xing

Liu

et al. 2010

Carbohydrate Polymers

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Effect of heparin coating on epichlorohydrin cross-linked chitosan microspheres on the adsorption of copper (II) ions

Cited by 81 publications

References 22 publications

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Kinetic Studies of Adsorption of Heavy Metals on Clays

Studies on adsorption behavior of Pb(II) onto a thiourea-modified chitosan resin with Pb(II) as template

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