Synthesis and characterization of novel guar gum hydrogels and their use as Cu2+ sorbents

Chauhan, Kalpana; Chauhan, Ghanshyam S.; Ahn, Jou–Hyeon

doi:10.1016/j.biortech.2009.03.007

Cited by 85 publications

(27 citation statements)

References 31 publications

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“…This means that -NH/-OH participated in the adsorption processes of Cu 2+ [35]. These results are similar to others obtained from algae, crab shell and guar gum with different metals [21,25,33]. After adsorption, the characteristic peaks representing amide I also moved 2.0, 3.0 and 6.9 cm −1 , respectively, implying that the copper ions were adsorbed by the group on the surface of the cell wall through chemical interactions [25].…”

Section: The Ftir Analysissupporting

confidence: 88%

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Study of the mechanisms of Cu2+ biosorption by ethanol/caustic-pretreated baker's yeast biomass

Zhang

Liu

Meng

et al. 2010

Journal of Hazardous Materials

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Section: The Ftir Analysissupporting

confidence: 88%

“…The IR spectra play an important role in the analysis of these organic functional groups and the mechanism of heavy metal ions adsorbed by the adsorbent [21,33,34]. Fig.…”

Section: The Ftir Analysismentioning

confidence: 99%

Study of the mechanisms of Cu2+ biosorption by ethanol/caustic-pretreated baker's yeast biomass

Zhang

Liu

Meng

et al. 2010

Journal of Hazardous Materials

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“…Various hydrogels proved to be effective in removing ionic dyes from aqueous solutions [22][23][24]. In this context, polymers coming from renewable resources are gaining more and more interest for application in the preparation of hydrogel-based sorbents due to their biodegradability and non-toxic nature [21,[25][26][27][28][29][30][31]. However, a combination of natural and synthetic polymers in the preparation of multicomponent hydrogels can enhance the properties of the composite gels or even induce novel characteristics for the gel.…”

Section: Introductionmentioning

confidence: 99%

Enhanced sorption of methylene blue from aqueous solutions by semi-IPN composite cryogels with anionically modified potato starch entrapped in PAAm matrix

Drăgan¹,

Loghin²

2013

Chemical Engineering Journal

108

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“…It should be recognized that although glutaraldehyde is toxic, its toxicity could be reduced significantly after its crosslinking. [11][12][13][14][15][16][17][18][19][20][21] In this investigation, we set out to examine preparation and property of crosslinking GG in order to improve the poor performance of the GG.…”

Section: Introductionmentioning

confidence: 99%

Preparation and property of crosslinking guar gum

Tang

Sun

et al. 2011

Polym J

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The preparation and properties of crosslinking guar gum (GG) were studied by using ethanol as a solvent, epichlorohydrin as a crosslinking agent and sodium hydroxide as a catalyst. Some factors affecting the crosslinking degree of the crosslinked GG were investigated: reaction time, reaction temperature, amount of crosslinking agent, pH and solvent concentration. The sedimentation volume method was selected to determine the crosslinking degree of the crosslinked GG. The crosslinking degree was obviously influenced by the pH, reaction temperature and the crosslinking agent. The crosslinking improved alkali and acid resistance, retrogradation and viscosity stability of GG. The crosslinked GG has a significantly narrower melting transition as compared with GG. Polymer Journal ( It hydrates fairly rapidly in cold water, which gives highly viscous pseudoplastic solutions of generally greater low-shear viscosity. GG and its derivatives served as thickener, stabilizer, blister and flocculant are employed in the food, textile, pharmaceutical and paper industries due to their special properties. [1][2][3][4] Much effort has been devoted to the study of appropriate systems with special properties in order to avoid or minimize the side effects and to improve the efficacy of the therapy in the field of drug delivery in the last decades. Polysaccharides appear to be very attractive for their peculiar physico-chemical characteristics. 5 GG is hydrophilic and swells in cold water, forming viscous colloidal dispersions or sols. This gelling property retards the release of the drug from the dosage form, increasing the likelihood of degradation in the colon. GG was found to be a colon-specific drug carrier in the form of matrix and compression-coated tablets as well as microspheres. The drug is inevitably dissolved, at least partially, because of the high pH level in the stomach. The modification of GG with borax or glutaraldehyde results in a product that is degraded by the enzymatic mixture of galactomannanase and a-galactosidase, possessing a higher buffer-uptake capacity as compared with native GG. The polysaccharides are crosslinked to a sufficient extent that they remain insoluble in water. [6][7][8][9][10] GG can be modified by etherification, esterification, oxidation or graft. The derivatives of GG may compensate for the disadvantages of natural GG. For example, a carboxymethyl derivative may increase the hydrophilicity and solution clarity of the galactomannans and make it more soluble in an aqueous solution. The oxidized GG can be quickly

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Synthesis and characterization of novel guar gum hydrogels and their use as Cu2+ sorbents

Cited by 85 publications

References 31 publications

Study of the mechanisms of Cu2+ biosorption by ethanol/caustic-pretreated baker's yeast biomass

Study of the mechanisms of Cu2+ biosorption by ethanol/caustic-pretreated baker's yeast biomass

Enhanced sorption of methylene blue from aqueous solutions by semi-IPN composite cryogels with anionically modified potato starch entrapped in PAAm matrix

Preparation and property of crosslinking guar gum

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