V.O. Ojijo and M.S. Onyango and Aoyi Ochieng and F.A.O. Otieno
Decolourization of Melanoidin Containing Wastewater Using South African Coal Fly Ash
58 - 64
2010
4
1
International Journal of Chemical and Molecular Engineering
https://publications.waset.org/pdf/7435
https://publications.waset.org/vol/37
World Academy of Science, Engineering and Technology
Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m2g and pore volume of 0.002245 cm3g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removal was achieved around pH 6, whereas increasing sorbent mass from 10gL to 200 gL enhanced colour reduction from 25 to 86 at 298 K. Spontaneity of the process was suggested by negative Gibbs free energy while positive values for enthalpy change showed endothermic nature of the process. Nonlinear optimization of error functions resulted in Freundlich and RedlichPeterson isotherms describing sorption equilibrium data best. The coal fly ash had maximum sorption capacity of 53 mgg and could thus be used as a low cost adsorbent in melanoidin removal.
Open Science Index 37, 2010