Adsorptive Sequestration of Nitrophenol from Phenol Mixture onto Locust Bean Tree Sawdust
Advances in Applied Science and Technology Vol. 3,
Page 101-114
Abstract
The efficacy of an adsorbent prepared from sawdust of Locust bean tree to remove 4-Nitrophenol (4NP), from its aqueous solution and from binary and ternary mixture of phenols (with phenol or / and chlorophenol) was studied. Batch adsorption procedures were carried out to investigate the kinetics, isotherms and thermodynamics of the adsorptive removal, as well as the influence of sawdust dosage, pH, initial concentration of the phenols and temperature on the efficiency of the process. Equilibrium was attained at 12 hours, with the optimum sawdust concentration of 5 g/L. The kinetics of the adsorption could best be described by pseudo-second order model, while Freundlich isotherm gave the best fit in all the systems studied. The adsorption process was thermodynamically nonspontaneous at low temperatures as ∆G was positive; but it was endothermic in the single, binary and ternary systems.
Keywords:
- Pollution
- nitrophenol
- Parkia biglobosa
- adsorption
- locust bean tree
- ternary phenol mixture
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