Kinetics and thermodynamics of the adsorption of some dyestuffs and p-nitrophenol by chitosan and MCM-chitosan from aqueous solution

Uzun, İlhan; Güzel, Fuat

doi:10.1016/j.jcis.2004.02.022

Cited by 91 publications

(43 citation statements)

References 9 publications

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“…The high temperature increased the dimension of the chitosan pores, and thus increased the adsorption capacities. Cestari et al 28 and Uzun and G€ u zel 36 also found similar phenomenon, suggesting that adsorption study in this work is endothermic and it has been proved by the following expression.…”

Section: Effect Of Adsorption Temperaturesupporting

confidence: 75%

Preparation and adsorption properties of diethylenetriamine‐modified chitosan beads for acid dyes

Yan

Xiang

et al. 2013

J of Applied Polymer Sci

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This work has demonstrated that the novel chitosan derivative, synthesized by phase transition and grafting diethylenetriamine, has a great potential for the adsorption of acid dyes from aqueous solutions. Four acid dyes with different molecular sizes and structures were used to investigate the adsorption performance of diethylenetriamine-modified chitosan beads (CTSN-beads). Results indicated that the adsorption of dyes on CTSN-beads was largely dependent on the pH value and controlled by the electrostatic attraction. In addition, the adsorption rate (AO10 > AO7 > AR18 > AG25) and adsorption capacities (AO7 > AR18 > AO10 > AG25) were directly related to the molecular size of the dye and the amount of the sulfonate groups on the dye molecules. The equilibrium and kinetic data fitted well with the Langmuir-Freundlich and pseudo-second-order model. Furthermore, thermodynamic parameters indicated that the adsorption processes occurred spontaneously and higher temperature made the adsorption easier. The reuse tests indicated that the CTSN-beads can be recovered for multiple uses.

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Section: Effect Of Adsorption Temperaturesupporting

confidence: 75%

Preparation and adsorption properties of diethylenetriamine‐modified chitosan beads for acid dyes

Yan

Xiang

et al. 2013

J of Applied Polymer Sci

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“…It is a costeffective biosorbent for treating wastewater containing heavy metal and organic contaminants [11][12][13]. A series of studies revealed that chitosan had a higher adsorptive capacity for copper [14,15].…”

mentioning

confidence: 99%

Systematic study of synergistic and antagonistic effects on adsorption of tetracycline and copper onto a chitosan

Kang

Liu

Zheng

et al. 2010

Journal of Colloid and Interface Science

245

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a b s t r a c tSorption of tetracycline and copper onto chitosan is systematically investigated in this study. The sorption of tetracycline and copper occurs rapidly in the first few hours and 90% of completed uptake occurs in the first 11-12 and 6 h, respectively. The sorption equilibrium of both contaminants is established in 24 h. The solution pH largely affects the sorption of both contaminants. The tetracycline uptake increases as pH is increased from 2.8 to 5.6, and 2.5 to 7 in the absence and the presence of copper, respectively. The presence of copper significantly improves the tetracycline adsorption likely due to the formation of cationic bridging of copper between tetracycline and chitosan. The maximum adsorption capacity and the adsorption affinity constant for tetracycline dramatically increase from 53.82 to 93.04 mmol kg À1 and from 1.22 to 10.20 L mmol À1 as the copper concentration is increased from 0 to 0.5 mmol L À1. The uptake of copper increases with an increase in pH from around 3.5-6.0 in the absence and the presence of tetracycline. The presence of tetracycline decreases the copper adsorption, which may be ascribed to the competition of tetracycline with copper ions for the adsorption sites at the chitosan surface. The adsorption isothermal data of both tetracycline and copper are fit well by the Langmuir equation. The maximum adsorption capacity and adsorption affinity constant of copper ions decrease from 1856.06 to 1486.20 mmol kg À1 and from 1.80 to 1.68 L mmol À1 in the absence and the presence of tetracycline. FTIR and XPS studies reveal that amino, hydroxyl, and ether groups in the chitosan are involved in the adsorption of tetracycline and copper.

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“…To enhance the sorption of basic dyes, negatively charged functional groups (i.e., -COOH) have been grafted onto -NH 2 and/or -OH groups in chitosan molecules. Grafting of the chitosan molecule with chloroacetic acids has produced monocarboxymethylated chitosan (MCM-chitosan) (Uzun and Güzel 2004), and N, O-carboxymethyl-chitosan (N, O-CMC) . Uzun and Güzel (2004) reported an increase in sorption percentage of MCM-chitosan for acid orange 7 (99%) compared to that of chitosan (12%).…”

Section: Remediation Of Organic Contaminantsmentioning

confidence: 99%

“…Grafting of the chitosan molecule with chloroacetic acids has produced monocarboxymethylated chitosan (MCM-chitosan) (Uzun and Güzel 2004), and N, O-carboxymethyl-chitosan (N, O-CMC) . Uzun and Güzel (2004) reported an increase in sorption percentage of MCM-chitosan for acid orange 7 (99%) compared to that of chitosan (12%). reported higher sorption capacity of N, O-CMC for congo red dye (331 mg/g) than that of chitosan (79 mg/g).…”

Section: Remediation Of Organic Contaminantsmentioning

confidence: 99%

Environmental Applications of Chitosan and Its Derivatives

Yong

Shrivastava

Srivastava

et al. 2014

Reviews of Environmental Contamination and Toxicology

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Chitosan originates from the seafood processing industry and is one of the most abundant of bio-waste materials. Chitosan is a by-product of the alkaline deacetylation process of chitin. Chemically, chitosan is a polysaccharide that is soluble in acidic solution and precipitates at higher pHs. It has great potential for certain environmental applications, such as remediation of organic and inorganic contaminants, including toxic metals and dyes in soil, sediment and water, and development of contaminant sensors. Traditionally, seafood waste has been the primary source of chitin. More recently, alternative sources have emerged such as fungal mycelium, mushroom and krill wastes, and these new sources of chitin and chitosan may overcome seasonal supply limitations that have existed. The production of chitosan from the above-mentioned waste streams not only reduces waste volume, but alleviates pressure on landfills to which the waste would otherwise go. Chitosan production involves four major steps, viz., deproteination, demineralization, bleaching and deacetylation. These four processes require excessive usage of strong alkali at different stages, and drives chitosan's production cost up, potentially making the application of high-grade chitosan for commercial remediation untenable. Alternate chitosan processing techniques, such as microbial or enzymatic processes, may become more cost-effective due to lower energy consumption and waste generation. Chitosan has proved to be versatile for so many environmental applications, because it possesses certain key functional groups, including - OH and -NH2 . However, the efficacy of chitosan is diminished at low pH because of its increased solubility and instability. These deficiencies can be overcome by modifying chitosan's structure via crosslinking. Such modification not only enhances the structural stability of chitosan under low pH conditions, but also improves its physicochemical characteristics, such as porosity, hydraulic conductivity, permeability, surface area and sorption capacity. Crosslinked chitosan is an excellent sorbent for trace metals especially because of the high flexibility of its structural stability. Sorption of trace metals by chitosan is selective and independent of the size and hardness of metal ions, or the physical form of chitosan (e.g., film, powder and solution). Both -OH and -NH2 groups in chitosan provide vital binding sites for complexing metal cations. At low pH, -NH3 + groups attract and coagulate negatively charged contaminants such as metal oxyanions, humic acids and dye molecules. Grafting certain functional molecules into the chitin structure improves sorption capacity and selectivity for remediating specific metal ions. For example, introducing sulfur and nitrogen donor ligands to chitosan alters the sorption preference for metals. Low molecular weight chitosan derivatives have been used to remediate metal contaminated soil and sediments. They have also been applied in permeable reactive barriers to remediate metals in soil and groun...

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Kinetics and thermodynamics of the adsorption of some dyestuffs and p-nitrophenol by chitosan and MCM-chitosan from aqueous solution

Cited by 91 publications

References 9 publications

Preparation and adsorption properties of diethylenetriamine‐modified chitosan beads for acid dyes

Preparation and adsorption properties of diethylenetriamine‐modified chitosan beads for acid dyes

Systematic study of synergistic and antagonistic effects on adsorption of tetracycline and copper onto a chitosan

Environmental Applications of Chitosan and Its Derivatives

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