Kinetics, Thermodynamics and Mass Transfer Studies on Application of Titania Nanofibers for Heavy Metal Adsorption
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 3
Abstract
In the present work, lab synthesized TiO2 nano-adsorbents in fiber form with surface area of about 740 m2/g and promising FTIR results were employed for the removal of Pb(II) and Zn(II) ions from aqueous solutions by batchadsorption technique. The SEM results indicated well aligned fibers with average diameter of 255nm. The effect of contact time, initial concentration of metal ions, temperature, solution pH and adsorbent dose on the amount of metal ions adsorbed was investigated. The adsorption process was fast for both the metals, and equilibrium was achieved within 120 min. The amount of metals adsorbed increased as temperature increased, suggesting an endothermic adsorption. The process followed second order kinetics and the data gave best fit for Langmuir isotherm. The Mass transfer mechanism appeared to be film diffusion controlled and the thermodynamic parameters ΔG°, ΔH° and ΔS° highlighted the fact that the adsorption was spontaneous and endothermic in nature.
Authors and Affiliations
Abhilasha Dixit, P. K. Mishra, M. S. Alam
Keywords
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