TEOS as an improved alternative for chitosan beads cross-linking: A comparative adsorption study

In this work, Ni and SnO2loaded Chitosan nanomaterials are prepared by neutralization method, obtained by drop wise addition of Chitosan solution to a solution of NaOH, followed by cross-linking. The Structural, morphological and Raman analyses are carried out. The antibacterial activity is analysed against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa and evaluated by the calculation of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). The obtained results show that, Ni-loaded nanoparticles could inhibit the growth of various bacteria better than SnO2. These results revealed that, the exposure of Staphylococcus aureus to the Chitosan nanoparticles led to the disruption of cell membranes and the leakage of cytoplasm.

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Synthesis of Fe Ionic-Imprinted Polyeugenol Using Polyethylene Glycol Diglycidilether as Cross-Linking Agent for Sorption of Fe(III)

Indonesian Journal of Chemistry ◽

10.22146/ijc.21200 ◽

2015 ◽

Vol 15 (3) ◽

pp. 305-314 ◽

Cited By ~ 14

Author(s):

Muhammad Cholid Djunaidi ◽

Jumina Jumina ◽

Dwi Siswanta ◽

Mathias Ulbricht

Keyword(s):

Polyethylene Glycol ◽

Adsorption Kinetics ◽

Selective Adsorption ◽

Aqueous Media ◽

Diglycidyl Ether ◽

Control Synthesis ◽

Cross Linking ◽

Hydrogen Bond Formation ◽

Adsorption Study ◽

Kinetics And Isotherms

Fe-Ionic Imprinted Polymer (IIP) from polyeugenol as base polymer and polyethylene glycol diglycidyl ether (PEGDE) as cross-linking agent had been synthesized to adsorb Fe(III) from aqueous media. The non-imprinting material (NIP) and polyeugenol were used in the adsorption study as control. Synthesis work included polymerization, template uploading, crosslinking and template removal, optimized for different template ion upload pH and concentrations. The polymers were characterized by FTIR spectroscopy, XRD and SEM-EDX, followed by adsorption test to study the adsorption kinetics and isotherms for all adsorbents. Selective adsorption study of IIP was carried out using binary mixtures of Fe(III) and Cr(III), Pb(II), Cd(II). Experimental results showed that the optimum conditions for the synthesis was template upload pH of 3, Fe/polyeugenol ratio of 1 mg/g, while the optimum adsorption pH was 3. The adsorption mechanism of Fe(III) on all adsorbents was dominated by hydrogen bond formation. The adsorption kinetics followed the pseudo-second-order model while the equilibrium data was best explained by the Langmuir isotherm model. The adsorption capacity of Fe(III) on the IIP was 12.73 mg/g, higher than that of the other adsorbents. Results also show that IIP-Fe was more selective toward Fe than NIP by 2.69 (Cd), 1.66 (Cr) and 1.6 (Pb) fold, respectively.

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IMMOBILIZATION OF HUMIC ACID ON CHITOSAN BEADS BY PROTECTED CROSS-LINKING METHOD AND ITS APPLICATION AS SORBENT FOR Pb(II)

Indonesian Journal of Chemistry ◽

10.22146/ijc.21485 ◽

2010 ◽

Vol 10 (1) ◽

pp. 88-95

Author(s):

Radna Nurmasari ◽

Uripto Trisno Santoso ◽

Dewi Umaningrum ◽

Taufiqur Rohman

Keyword(s):

Humic Acid ◽

Adsorption Capacity ◽

Active Sites ◽

Cross Linking ◽

Basic Solution ◽

Chitosan Beads ◽

Reaction Method ◽

The Cross

Immobilization of humic acid (HA) on chitosan beads has been done using a protected cross-linking reaction method and the product was then utilized as sorbent for Pb(II). Protection of the active sites of HA was carried out by interacting HA with Pb(II) before performing the cross-linking reaction in order to maintain its adsorption capacity. Protected-HA was cross-linked with chitosan beads using glutaraldehyde in order to obtain sorbent insoluble both in aqueous acidic and basic solution. The result showed that the amount of immobilized HA on beads chitosan was 88.60% by weight. The adsorption capacity of the protected-sorbent beads for Pb(II) was 784 mg/g. As a comparison, the adsorption capacity of the non-protected sorbent beads for Pb(II) was only 142 mg/g. Keywords: immobilization, adsorption, crosslinking, humic acid, chitosan

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Adsorption of Pb(II), Cu(II), Ni(II), Zn(II), Cr(VI) and Cd(II) Ions by Microwave-Improved Grafting Technique of Cross-Linking Composite Chitosan Beads. Studies Concerning Equilibrium, Isotherm and Desorption

Enhanced Chitosan Material for Water Treatment - Engineering Materials ◽

10.1007/978-3-030-71722-3_3 ◽

2021 ◽

pp. 47-70

Author(s):

Ephraim Igberase ◽

Peter Ogbemudia Osifo ◽

Tumisang Seodigeng ◽

Ikenna Emeji

Keyword(s):

Cross Linking ◽

Equilibrium Isotherm ◽

Chitosan Beads ◽

Grafting Technique

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Preparation of chitosan beads by simultaneous cross-linking/insolubilisation in basic pH

European Journal of Pharmaceutical Sciences ◽

10.1016/j.ejps.2004.09.013 ◽

2005 ◽

Vol 24 (1) ◽

pp. 77-84 ◽

Cited By ~ 51

Author(s):

R. Barreiro-Iglesias ◽

R. Coronilla ◽

A. Concheiro ◽

C. Alvarez-Lorenzo

Keyword(s):

Cross Linking ◽

Chitosan Beads

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Influence of cross-linking agent type and chitosan content on the performance of pectinate-chitosan beads aimed for colon-specific drug delivery

Drug Development and Industrial Pharmacy ◽

10.3109/03639045.2011.641566 ◽

2011 ◽

Vol 38 (9) ◽

pp. 1142-1151 ◽

Cited By ~ 20

Author(s):

F. Maestrelli ◽

M. Cirri ◽

N. Mennini ◽

M. Bragagni ◽

N. Zerrouk ◽

...

Keyword(s):

Drug Delivery ◽

Cross Linking ◽

Specific Drug ◽

Chitosan Beads ◽

Colon Specific Drug Delivery ◽

Chitosan Content

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Development of chitosan-based granular adsorbents for enhanced and selective adsorption performance in heavy metal removal

Water Science & Technology ◽

10.2166/wst.2006.736 ◽

2006 ◽

Vol 54 (10) ◽

pp. 103-113 ◽

Cited By ~ 32

Author(s):

N. Li ◽

R. Bai

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Adsorption Capacity ◽

Selective Adsorption ◽

Cross Linking ◽

The Novel ◽

Chitosan Beads ◽

Hydrogel Beads ◽

Amine Groups ◽

The Cross

Novel chitosan-based granular adsorbents were developed for enhanced and selective separation of heavy metal ions. The research included the synthesis of chitosan hydrogel beads, the cross-linking of the hydrogel beads with ethylene glycol diglycidyl ether (EGDE) in a conventional and a novel amine-shielded method, the functionalization of the chitosan beads through surface grafting of polyacrylamide via a surface-initiated atom transfer radical polymerization (ATRP) method, and the examination of the adsorption performance of the various types of chitosan beads in the removal of heavy metal ions. It was found that chitosan beads were effective in heavy metal adsorption, the conventional cross-linking method improved the acidic stability of the beads but reduced their adsorption capacity, the novel amine-shielded cross-linking method retained the good adsorption capacity while it improved the acidic stability of the beads, and the grafting of polyacrylamide on chitosan beads not only enhanced the adsorption capacity but also provided the beads with excellent selectivity for mercury over lead ions. XPS analyses indicated that the adsorption of metal ions on chitosan beads was mainly attributed to the amine groups of chitosan, the novel amine-shielded cross-linking method preserved most of the amine groups from being consumed by the cross-linking process and hence improved the adsorption capacity of the cross-linked chitosan beads, and the many amide groups from the polyacrylamide grafted on the chitosan beads increased the adsorption capacity and also made possible selective adsorption of mercury ions because the amide groups can form covalent bonds with mercury ions.

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