Reactive dyes remotion by porous TiO2-chitosan materials

In this work, the aim was to evaluate the remotion (adsorption plus degradation) of two reactive dyes, Methylene Blue (MB) and Benzopurpurin (BP), from aqueous solutions by the utilization of TiO2-chitosan microporous materials. Two different TiO2-chitosan hybrid materials were synthesized: TiO2-Chi...

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Bibliographic Details
Published in:Journal of hazardous materials 2008-04, Vol.152 (2), p.765-777
Main Authors: ZUBIETA, Carolina E, MESSINA, Paula V, LUENGO, Carina, DENNEHY, Mariana, PIERONI, Olga, SCHULZ, Pablo C
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Chitosan
Coloring Agents - isolation & purification
Exact sciences and technology
General and physical chemistry
Industrial Waste
Pollution
Reactors
Textile Industry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium
Water Pollutants, Chemical - isolation & purification
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Summary:In this work, the aim was to evaluate the remotion (adsorption plus degradation) of two reactive dyes, Methylene Blue (MB) and Benzopurpurin (BP), from aqueous solutions by the utilization of TiO2-chitosan microporous materials. Two different TiO2-chitosan hybrid materials were synthesized: TiO2-Chit A with 280 mg chitosan/gTiO2 and TiO2-Chit B with 46.76 mg chitosan/g TiO2. Adsorption data obtained at different solution temperatures (25, 35, and 45 degrees C) revealed an irreversible adsorption that decrease with the increment of T. Langmuir, Freundlich and Sips isotherm equation were applied to the experimental data. The obtained parameters and correlation coefficient showed that the adsorption of both dyes on TiO2-Chit A at the three work temperatures was best predicted by the Langmuir isotherm, while Sips equation adjusted better to adsorption data on TiO2-Chit B. The adsorption enthalpy was relatively high and varied with T, indicating that interaction between adsorbent and adsorbate molecules was not only physical but chemical. There is a change in the adsorption heat capacity, (Delta(ads)C(p)
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2007.07.043