Graphite oxide/chitosan composite for reactive dye removal

Travlou, Nikolina A.; Kyzas, George Z.; Lazaridis, Nikolaos K.; Deliyanni, Eleni A.

doi:10.1016/j.cej.2012.12.008

Cited by 254 publications

(129 citation statements)

References 38 publications

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“…The sample of Ch-GO was dried in a vacuum oven at 60 C and then ground to an ideal particle size. 24 Ch-GO/PUF materials were prepared in three stages: C and maintained for 3 h in the oven, where the material expanded. After foaming development, the block was demoded.…”

Section: Materials and Stock Solutionsmentioning

confidence: 99%

Adsorption behavior of crystal violet from aqueous solutions with chitosan–graphite oxide modified polyurethane as an adsorbent

Qin

Qiu

Rong

et al. 2015

J of Applied Polymer Sci

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A series of chitosan (Ch)-graphite oxide (GO)-modified polyurethane foam (PUF) materials as adsorbents were synthesized by a foaming technique. The adsorbent was characterized through IR spectroscopy, scanning electron microscopy, and thermogravimetric analysis (TGA). Batch adsorption experiments of the cationic dye crystal violet (CV) were carried out as a function of the Ch-GO content (1.0-8.0 wt %), solution pH (2-10), dye concentration (100-300 mg/L), adsorbent dosage (10-60 mg/mL), and temperature (20-45 C). At a lower pH value, the surface of Ch-GO/PUF acquired positive charge by absorbing H 1 ions; this resulted in a decreasing adsorption of the cationic CV dye because of electrostatic repulsion. As the pH of the aqueous system increased, the numbers of negatively charged sites increased by absorbing OH 2 ions, and a significantly high electrostatic attraction existed between the negatively charged surface of Ch-GO/PUF and the cationic dye (CV) molecules. This led to maximum dye adsorption. The kinetics, thermodynamics, and equilibrium of CV adsorption onto Ch-GO/PUF were investigated. The equilibrium data for CV adsorption fit the Langmuir equation, with a maximum adsorption capacity of 64.935 mg/g. The adsorption kinetics process followed the pseudo-second-order kinetics model. Thermodynamic parameters analysis revealed that the adsorption of CV from an aqueous solution by a Ch-GO modified PUF material was a spontaneous and endothermic process. We concluded that Ch-GO/PUF is a promising adsorbent for the removal of CV from aqueous solutions.

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Section: Materials and Stock Solutionsmentioning

confidence: 99%

Adsorption behavior of crystal violet from aqueous solutions with chitosan–graphite oxide modified polyurethane as an adsorbent

Qin

Qiu

Rong

et al. 2015

J of Applied Polymer Sci

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“…So, there is a possibility for the monolayer coverage of dye molecules at the outer interface of adsorbents. With an increase in the initial dye concentrations, the available adsorption sites become fewer and, subsequently, the adsorption depends on the initial dye concentration 35 .…”

Section: Isotherm Studiesmentioning

confidence: 99%

Preparation of A MWCNT-Graphite Composite Based on Sol Gel Method for Dye Removal

Shirgholami¹,

Mirjalili²,

Nasirizadeh³

2017

Orient. J. Chem

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Carbon based composites have good capability for elimination of colored pollutants. In this work, a multi-walled carbon nanotube-graphite Composite (MW-g-C) was prepared using a sol gel method. The N 2 adsorption/desorption curves, scanning electron microscopy and zeta potential were used for characterization of MW-g-C. The adsorption characteristics of MW-g-C were studied using Basic Blue 41 (BB41) dye as an adsorbate. The effects of several influential parameters such as contact time, pH, adsorbent dose and initial concentration on the adsorption were well investigated and optimized. The maximum amount of dye adsorbed in optimal conditions (include pH= 6.8, amount of MW-g-C= 1.37 g L -1) was 115 mg g -1 . The linear correlation coefficients and the standard deviations of Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin isotherms were determined. The results also showed that the adsorption kinetics was controlled by a pseudo second-order model for adsorption of dye onto MW-g-C. The ∆G°, ∆H° and E a values indicated that the adsorption of BB41 onto MW-g-C was physisorption.

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“…Especially, many researchers have reported the preparation and properties of GO/chitin and GO/biopolymer composites [9][10][11][12][13][14][15]. For example, Travlou et al have reported the synthesis and applications of GO/chitosan and GO/polysaccharides nanocomposites [9,14].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a polymer composite with GO has recently attracted much interest in the materials field due to its outstanding properties [1][2][3][4][5][6][7][8]. Especially, many researchers have reported the preparation and properties of GO/chitin and GO/biopolymer composites [9][10][11][12][13][14][15]. For example, Travlou et al have reported the synthesis and applications of GO/chitosan and GO/polysaccharides nanocomposites [9,14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Grafting of Polymers onto the Surface of Graphene Oxide

Tsubokawa¹,

Yamauchi²,

Fujiki³

et al. 2017

Graphene Materials - Structure, Properties and Modifications

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A simple grafting of polymers onto graphene oxide (GO) was achieved by polymer radical trapping, ligand-exchange reaction, and surface initiated cationic and anionic graft polymerization. Grafting of poly(ethylene glycol) (PEG) onto GO was successfully achieved by trapping of PEG radicals formed by thermal decomposition of PEG macroazo initiator to give PEG-grafted GO. The grafting of copolymers containing vinyl ferrocene moieties onto GO surfaces was also successfully achieved by the ligand-exchange reaction between ferrocene moieties of these copolymers and GO. Carboxyl groups on GO have an ability to initiate the cationic polymerizations of vinyl monomers, such as N-vinylcarbazole and isobutyl vinyl ether. The corresponding vinyl polymers were grafted onto GO, during the cationic polymerization, based on the termination of growing polymer cation by counter anion (carboxylate) groups on GO. It was found that the anionic ring-opening alternating copolymerization of epoxides with cyclic acid anhydrides was successfully initiated by potassium carboxylate groups on GO, introduced by neutralization of carboxyl groups with KOH, to give the corresponding polyester-grafted GO. The dispersibility of GO in organic solvents was remarkably improved by the grafting of the above polymers onto GO. In addition, easy preparation of reduced GO-based conducting polyaniline composite organogel will be discussed.

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Graphite oxide/chitosan composite for reactive dye removal

Cited by 254 publications

References 38 publications

Adsorption behavior of crystal violet from aqueous solutions with chitosan–graphite oxide modified polyurethane as an adsorbent

Adsorption behavior of crystal violet from aqueous solutions with chitosan–graphite oxide modified polyurethane as an adsorbent

Preparation of A MWCNT-Graphite Composite Based on Sol Gel Method for Dye Removal

A Novel Grafting of Polymers onto the Surface of Graphene Oxide

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