1Makerere University, Department of Chemistry, Box 7062, Kampala, Uganda
2Wesleyan University, Department of Earth Sciences, USA
3Makerere University, Department of Geology, Box 7062, Kampala, Uganda
*Person to whom correspondences can be made: email; ishamukasa@yahoo.com
Online published on 10 November, 2014.
The efficiency of recycled clays to bleach oils measured by decrease in absorbance of bleached oils was largest when recycled clays had been calcined at 450°C and leached in boiling mixture of 20% acid strength for 16 hours. The Langmuir constant a varied from 0.4x10−2 to 16 x10−2 and b increased from 4.7x10−2 to 95.38x10−2. The Freundlich constant n increased from 8x10−3 to 33x10−3 and k from 3.9x10−2 to 11.8 x10−2 as concentration of acid increased. The enthalpy of adsorption increased from -6.7x10−2 to 22.2x10−2 kJmol−1.
Recycling, Vegetable oils, Calcined, Bleaching, Clay, Absorbance
