Kinetic and thermodynamic studies of adsorption of 4-chloro-2-nitrophenol on nano- Ti02

Subject Areas : Journal of Physical & Theoretical Chemistry

A. Mehrizad ^{1 *} , K. Zare ^{2 *} , H. Dashti Khavidaki ^{3 *} , S. Dastmalchi ^{4 *} , H. Aghaie ^{5 *} , P. Gharbani ^{6 *}

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Received: 2015-05-31 Accepted : 2015-05-31 Published : 2011-05-01

Keywords: Adsorption, Kinetic, Thermodynamic, 4-Chloro-2-nitrophenol, Nano-TiO2,

Abstract :

Adsorption capacity of 4-chloro-2-nitrophenol (4C2NP) onto nano-Ti02 from aqueous solutions wasinvestigated in a batch system by considering the effects of various parameters like contact time, nano-TiO2 dosage, initial pH and initial 4C2NP concentration. Optimum conditions for 4C2NP adsorptionwere found to be initial pH z 2, nano-TiO2 closer- 0.01 g and equilibrium time 1 h. The adsorptionkinetic data were analyzed using pseudo-first and pseudo-second order models. It was found that thepseudo-second-order kinetic model was the most appropriate model, describing the adsorption kinetics.The thermodynamic parameters such as AG°, MP and AS° were computed from the experimental data.These values show that the adsorption of 4C2NP onto nano-Ti02 is spontaneous and endothermic.