kinetic and thermodynamic studies of adsorption of 4-chloro-2-nitrophenol on nano- ti02

Authors

a. mehrizad

k. zare

h. dashti khavidaki

s. dastmalchi

h. aghaie

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.

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Journal title:

journal of physical & theoretical chemistry

ISSN

volume 8

issue 1 2011

Keywords

[ ' a d s o r p t i o n ' , ' k i n e t i c ' , ' t h e r m o d y n a m i c ' , 4 , ' c h l o r o ' , 2 , ' n i t r o p h e n o l ' , ' n a n o ' , ' t i o 2 ' ]

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