Kinetic and Equilibrium parameters of reactive dyes adsorption on TiO2-Chitosan materials

P. MESSINA; C. ZUBIETA; P.C. SCHULZ

Torino

Congreso; 41st IUPAC World Chemistry Congress; 2007

International Union of Pure and Applied Chemistry (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 material. Two different TiO2-chitosan hybrid materials were synthesized:TiO2-chit A with 280mg chitosan/g TiO2 and TiO2-chit B with 46.76 mg chitosan/g TiO2. Adsorption data obtained at different solution temperatures (25,35 and 45ºC) revealed an irreversible adsorption that decreased 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 operation conditions were best predicted by Avrami model. The variation of the reaction order, n, and kav with T suggested different interaction mechanisms during adsorption process related to a pore followed by intraparticle diffusion control of the adsorption rate