Reactive and basic dyes removal by sorption onto chitosan derivatives

Division of Chemical Technology, School of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
Journal of Colloid and Interface Science (Impact Factor: 3.37). 03/2009; 331(1):32-39. DOI: 10.1016/j.jcis.2008.11.003
Source: PubMed

ABSTRACT In this study, the removal of a reactive (Remazol Yellow Gelb 3RS) and a basic (Basic Yellow 37) dye from aqueous solutions was investigated using cross-linked chitosan derivatives as sorbents (either powder or beads), which have been grafted with carboxyl and amide groups. The sorption behavior of the materials was examined through equilibrium, kinetic and pH-edges experiments. The reuse of sorbents was affirmed by sequential sorption-desorption cycles. Three isotherms (Langmuir, Freundlich, and Langmuir-Freundlich) were used to fit the equilibrium data, while the pseudo-second order equation for the kinetic data. Chitosan powder presented higher sorption capacity than beads. Chitosan grafted with amide groups was found superior sorbent for reactive dye at pH 2 (Q(max)=1211 mg/g), while chitosan grafted with carboxyl groups for basic dye at pH 10 (Q(max)=595 mg/g). For both cases the optimum contact time was 4 h using 1 g/L sorbent. The characterization of sorbents was achieved by scanning electron microscopy, particle size analysis and FTIR spectroscopy.

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    • "Commercially available activated carbons are usually derived from wood or coal, being considered expensive. This has led to the scientists to use lower-cost adsorbents, which are cheaper efficient substitutes [9] [10] [11]. "
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    ABSTRACT: Nanozeolite synthesized from fly ash and modified with hexadecyltrimethylamonium (HDTMA) was used as adsorbent to remove dyes-Solophenyl Navy (SN) and Solophenyl Turquoise (ST) and their hydrolysed forms Solophenyl Navy Hydrolysed (SNH) and Solophenyl Turquoise Hydrolysed (STH), respectively from simulated textile wastewater. The HDTMA-modified nano-zeolite (ZMF) was characterized by X-ray fluorescence spectrometry, X-ray diffraction and scanning electron microscopy. The ZMF presented negative charge probably due to the formation of a partial bilayer of HDTMA on exchangeable active sites on the external surface of unmodified nanozeolite. Initial dye concentration, contact time and equilibrium adsorption were evaluated. Two kinetic models including pseudo first and second order equations were analysed to understand the adsorption process. It was found that the adsorption kinetics of SN and ST; and their hydrolysed forms followed a pseudo second-order model. Langmuir, Freundlich and Temkin models were applied to describe the adsorption isotherms. Adsorption of the dyes was best described by the Langmuir model. Acute toxicity of the leached of ZMF to a waterflea, Ceriodaphnia dubia was determined, and the results showed an EC 50 value of 35%. In order to identify what substances were causing the observed toxicity for the leached of ZMF, Toxicity Identification Evaluation tests (TIE) were realized and showed that the baseline acute effects were significantly reduced after manipulation with Solid-Phase Extraction (SPE) and Ethylenediaminetetraacetic acid (EDTA). The data from the present study suggest that ZMF could be used as an adsorbent in the removal of Solophenyl dyes from wastewater.
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    • "Finally, it can be removed by adsorption technique. A dye molecule, Remacryl Red TGL (cationic/basic dye) was selected given the toxicity of this type of dyestuffs [32] and its use in previous works [18] [19]. The objective of this study is firstly to add some extra functional groups to chitosan in order to increase/strengthen the interactions between the pollutants (heavy metal and dye) and chitosan. "
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    ABSTRACT: In this work, a grafted (with carboxylic groups) chitosan material was synthesized and the adsorption mechanism of a basic dye (Remarcyl Red TGL denoted as CR) and a heavy metal (Zn) was investigated both in single-component and binary solutions. The reaction of succinic anhydride (SUC) with chitosan (CS) inserted a large number of carboxylic groups and the final chitosan-grafted material (abbreviated as CSUC) presented improved adsorption properties. A common phenomenon in the wastewater treatment science is the simultaneous existence of different-type pollutants (dyes, heavy metals etc). The adsorption behavior of the material prepared (CSUC) was tested as multi-adsorbent for the simultaneous removal of Zn and CR from simulated wastewaters. CSUC was characterized using various techniques as SEM, XRD, and TGA, while the variety of adsorption interactions dominated in different pH-conditions (electrostatic forces, hydrogen bonding, chelation etc) were confirmed with FTIR spectroscopy. The calculation of adsorption rate and maximum adsorption capacity were done using kinetic tests (pseudo-second order equation) and isotherms curves (Langmuir-Freundlich model), respectively. The antagonistic adsorption of CR or/and Zn was confirmed with selectivity experiments in binary mixtures. The reuse of this super-adsorbent was also proved with a series of 40 cycles of sequential adsorption and desorption modules.
    Chemical Engineering Journal 01/2015; 259:438-448. DOI:10.1016/j.cej.2014.08.019 · 4.32 Impact Factor
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    • "However, the design of an adsorption system to treat colored effluents also requires the investigation of the adsorption kinetics (Crini and Badot, 2008). Generally, in the studies about dye removal on chitosan based materials, the kinetic investigation is based on the adsorption reaction models (Kyzas and Lazaridis, 2009; Dotto and Pinto, 2011a; M a n u s c r i p t "
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    ABSTRACT: The adsorption kinetics of erythrosine B and indigo carmine on chitosan films was studied by a diffusional mass transfer model. The experimental curves were obtained in batch system under different conditions of stirring rate (80–200 rpm) and initial dye concentration (20–100mgL−1). For the model development, external mass transfer and intraparticle diffusion steps were considered and the specific simplifications were based on the system characteristics. The proposed diffusional mass transfer model agreed very well with the experimental curves, indicating that the surface diffusion was the rate limiting step. The external mass transfer coefficient (kf) was dependent of the operating conditions and ranged from 1.32×10−4 to 2.17×10−4 m s−1. The values of surface diffusion coefficient (Ds) increased with the initial dye concentration and were in the range from 0.41×10−14 to 22.90×10−14 m2 s−1. The Biot number ranged from 17.0 to 478.5, confirming that the intraparticle diffusion due to surface diffusion was the rate limiting step in the adsorption of erythrosine B and indigo carmine on chitosan films.
    Chemical Engineering Research and Design 11/2014; 92:2324-2332. DOI:10.1016/j.cherd.2014.03.013 · 2.28 Impact Factor
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