The influence of the degree of cross-linking on the adsorption properties of chitosan beads

2008 ◽  
Vol 99 (15) ◽  
pp. 7377-7382 ◽  
Author(s):  
Peter O. Osifo ◽  
Athena Webster ◽  
Hein van der Merwe ◽  
Hein W.J.P. Neomagus ◽  
Marius A. van der Gun ◽  
...  
Keyword(s):  
Adsorption Properties ◽  
Cross Linking ◽  
Chitosan Beads

scholarly journals Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites

2020 ◽  
Vol 4 (3) ◽  
pp. 95
Author(s):  
Dexu Kong ◽  
Lee D. Wilson
Keyword(s):  
Methylene Blue ◽  
Aqueous Media ◽  
Dye Adsorption ◽  
Adsorption Properties ◽  
Point Of Zero Charge ◽  
Cross Linking ◽  
Gravimetric Analysis ◽  
Adsorption Sites ◽  
Biopolymer Composites

To address the need to develop improved hybrid biopolymer composites, we report on the preparation of composites that contain chitosan and pectin biopolymers with tunable adsorption properties. Binary biopolymer composites were prepared at variable pectin–chitosan composition in a solvent directed synthesis, dimethyl sulfoxide (DMSO) versus water. The materials were characterized using complementary methods (infrared spectroscopy, thermal gravimetric analysis, pH at the point-of-zero charge, and dye-based adsorption isotherms). Pectin and chitosan composites prepared in DMSO yielded a covalent biopolymer framework (CBF), whereas a polyelectrolyte complex (PEC) was formed in water. The materials characterization provided support that cross-linking occurs between amine groups of chitosan and the –COOH groups of pectin. CBF-based composites had a greater uptake of methylene blue (MB) dye over the PEC-based composites. Composites prepared in DMSO were inferred to have secondary adsorption sites for enhanced MB uptake, as evidenced by a monolayer uptake capacity that exceeded the pectin–chitosan PECs by 1.5-fold. This work provides insight on the role of solvent-dependent cross-linking of pectin and chitosan biopolymers. Sonication-assisted reactions in DMSO favor CBFs, while cross-linking in water yields PECs. Herein, composites with tunable structures and variable physicochemical properties are demonstrated by their unique dye adsorption properties in aqueous media.

Geometric, Magnetic, and Adsorption Properties of Cross-Linking Carbon Nanotubes: A Computational Study

2013 ◽  
Vol 117 (7) ◽  
pp. 3646-3652 ◽  
Author(s):  
Jianhua Wu ◽  
Anahita Ayasoufi ◽  
Jerzy Leszczynski ◽  
Frank Hagelberg
Keyword(s):  
Carbon Nanotubes ◽  
Computational Study ◽  
Adsorption Properties ◽  
Cross Linking

scholarly journals Preparation and application of polyethyleneimine-modified corncob magnetic gel for removal of Pb(ii) and Cu(ii) ions from aqueous solution

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 1950-1960
Author(s):  
Zhi Chen ◽  
Jun Zeng ◽  
Zhi-Bo Zhang ◽  
Zhi-Jie Zhang ◽  
Shan Ma ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Properties ◽  
Cross Linking ◽  
Modified Chitosan

A kind of magnetic gel material was synthesized by cross-linking PEI modified chitosan and corncob biomass with good adsorption properties of heavy metal ions.

Synthesis and Adsorption Properties of Crosslinked Starch Microspheres (CSM)

2011 ◽  
Vol 418-420 ◽  
pp. 702-705
Author(s):  
Cong Jian Li ◽  
Qin Tie Lin ◽  
Qian Jun Liu ◽  
Han Ping Pan ◽  
Ru Ting Zheng
Keyword(s):  
Graft Copolymerization ◽  
Removal Rate ◽  
Methyl Violet ◽  
Volume Ratio ◽  
Adsorption Properties ◽  
Orthogonal Test ◽  
Cross Linking ◽  
Optimal Conditions ◽  
Single Factor ◽  
The Cross

Starch as the material, MBAA as the cross-linking agent, Tween60 and Span60 as the emulsifier, K2S2O8-Na2SO4 as the initiator, the cyclohexane as the oil phase and the removal rate of methyl violet as an index, crosslinked starch microspheres (CSM) was synthetized by means of reverse suspension emulsion and graft-copolymerization method through orthogonal test and single factor optimization experiment. The results showed the optimal conditions of the preparation of the crosslinked starch microspheres(CSM) were as follow: the concentration of the starch is 5%, the dosage of the MBAA, initiator and emulsifier are 0.125g, 0.5g and 0.6g, the volume ratios between the Span60 and Tween60 is 85:15, and the volume ratio between the cyclohexane and water is 4:1.

Improving survivability of Lactobacillus plantarum in alginate-chitosan beads reinforced by Na-tripolyphosphate dual cross-linking

LWT ◽  
2018 ◽  
Vol 97 ◽  
pp. 440-447 ◽  
Author(s):  
Asma Sadat Vaziri ◽  
Iran Alemzadeh ◽  
Manouchehr Vossoughi
Keyword(s):  
Lactobacillus Plantarum ◽  
Cross Linking ◽  
Chitosan Beads

Self-assembly of graphene oxide aerogels by layered double hydroxides cross-linking and their application in water purification

2014 ◽  
Vol 2 (23) ◽  
pp. 8941-8951 ◽  
Author(s):  
Qile Fang ◽  
Baoliang Chen
Keyword(s):  
Graphene Oxide ◽  
Structural Stability ◽  
Water Purification ◽  
Layered Double Hydroxides ◽  
Self Assembly ◽  
Adsorption Properties ◽  
The Self ◽  
Cross Linking ◽  
Double Hydroxides

3D macrostructural aerogels were synthesized based on the self-assembly of graphene oxide and LDHs, which exhibited excellent hydrophilicity, structural stability, and superior adsorption properties in water purification.

Assemblies of single-walled carbon nanotubes generated by covalent cross-linking with organic linkers

2015 ◽  
Vol 3 (13) ◽  
pp. 6747-6750 ◽  
Author(s):  
Ram Kumar ◽  
C. N. R. Rao
Keyword(s):  
Carbon Nanotubes ◽  
Gas Adsorption ◽  
Single Walled Carbon Nanotubes ◽  
Adsorption Properties ◽  
Cross Linking ◽  
Single Walled Carbon ◽  
Covalently Linked ◽  
Walled Carbon Nanotubes

Assemblies of covalently linked single-walled carbon nanotubes with superior gas adsorption properties have been prepared and characterized.

Antibacterial Activity Studies of Ni and SnO2 Loaded Chitosan Beads

2015 ◽  
Vol 832 ◽  
pp. 110-122 ◽  
Author(s):  
A. Ayeshamariam ◽  
G.V. Sankaracharyulu ◽  
M. Kashif ◽  
Shahid Hussain ◽  
Mohamed Bououdina ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Inhibitory Concentration ◽  
Minimum Bactericidal Concentration ◽  
Chitosan Nanoparticles ◽  
Chitosan Solution ◽  
Cross Linking ◽  
Chitosan Beads ◽  
Better Than

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.

scholarly journals Gas and Solution Uptake Properties of Graphene Oxide-Based Composite Materials: Organic vs. Inorganic Cross-Linkers

2019 ◽  
Vol 3 (3) ◽  
pp. 80 ◽  
Author(s):  
Sabzevari ◽  
Cree ◽  
Wilson
Keyword(s):  
Graphene Oxide ◽  
Zeta Potential ◽  
Electrostatic Interactions ◽  
Gas Adsorption ◽  
Aqueous Media ◽  
Adsorption Properties ◽  
Cross Linking ◽  
Supporting Evidence ◽  
Monolayer Adsorption ◽  
Adsorption Processes

This study focused on a comparison of the adsorption properties of graphene oxide (GO) and its composites that were prepared via cross-linking with chitosan (CTS) or Al3+ species, respectively. Comparative material characterization was achieved by several complementary methods: SEM, NMR spectroscopy, zeta-potential, dye-based adsorption, and gas adsorption at equilibrium and dynamic conditions. SEM, solids NMR, and zeta-potential results provided supporting evidence for cross-linking between GO and the respective cross-linker units. The zeta-potential of GO composites decreased upon cross-linking due to electrostatic interactions and charge neutralization. Equilibrium and kinetic adsorption profiles of the GO composites with methylene blue (MB) in aqueous media revealed superior uptake over pristine GO. The monolayer adsorption capacity (mg g−1) of MB are listed in descending order for each material: GO–CTS (408.6) > GO–Al (351.4) > GO (267.1). The gas adsorption results showed parallel trends, where the surface area and pore structure of the composites exceeded that for GO due to pillaring effects upon cross-linking. The green strategy reported herein for the preparation of tunable GO-based composites revealed versatile adsorption properties for diverse heterogeneous adsorption processes.

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