Investigation on adsorption capacity of TiO2-P25 nanoparticles in the removal of a mono-azo dye from aqueous solution: A comprehensive isotherm analysis
2014
In this work TiO2-P25 nanoparticles with high surface area have been used as
adsorbent for the removal of C.I Acid Red 27 (AR27), as an organic
contaminant from aqueous solution. Characteristics of phases and crystallite
size of TiO2-P25 nanoparticles were achieved from XRD and the surface area
and pore size distribution were obtained from BET and BJH techniques.
TiO2-P25 nanoparticles with almost 80% anatase and 20% rutile phases, the
average crystallite size of 18 nm, have specific surface area of 56.82 m2
g-1. The effect of various parameters like initial AR27 concentration, pH,
contact time and adsorbent dosage has been carried out in order to find
desired adsorption conditions. The desired pH for adsorption of AR27 onto
TiO2-P25 nanoparticles was 3. The equilibrium data were analyzed with various
2-, 3- and 4-parameter isotherm models. Equilibrium data fitted very well by
the 4-parameter Fritz-Schluender model. Results of adsorption kinetics study
indicated that the pseudo-second order kinetics provided the best fit with
correlation coefficients close to unity.
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