Kinetic and equilibrium parameters of reactive dyes adsorption on TiO2-chitosan materials.

P V MESSINA; C E ZUBIETA; P.C SCHULZ

Turin (Italia)

Congreso; 41 st IUPAC World Chemistry Congress; 2007

IUPAC

In this work, the aim was to evaluate the remotion of two reactive dyes, methylene blue (MB) and Benzopurpurin (BP), from aqueous solution by the utilization of TiO2-chitosan microporous materials. Two different TiO2-chitosan hybrid materials were synthesized: TiO2 –Chit A with 280 mg chitosan /g TiO2 and TiO2-Chit B with 46.76 mg chitosan/g TiO2. Adsorption data obtained at different solution temperature (25, 35 and 45 °C) revealed and irreversible adsorption that decreases with the increment of T. The kinetic adsorption data were processed by the application of Lagergren and Avrami models. It was found that adsorption of both dyes on both adsorbents under the operating conditions was best predict by Avrami model. The variation of the reaction order, n and kav with T suggested different interactions mechanism during adsorption process related to a pore followed by intraparticle diffusion control of the adsorption rate.