Statistical Modeling of Cobalt Adsorption on Van Pumice

Abstract

The aim of this study is to statistical modeling of cobalt adsorption on Van Pumice. Van
Pumice was used for determination of cobalt adsorption level. Modeling, depending
on time, was performed to determine for cobalt adsorption level at fixed pH 5 for
various concentration and temperatures in Van pumice. All adsorption measurements
were performed with the Thermo Scientific brand ICE spectrometer model 300 Series.
One-way analysis of variance was used for comparison to various temperature and
concentration levels. Tukey’s multiple comparison test was also performed to
determine different groups. Logarithmic, quadratic, Qubic and logistic models as well
as linear were used to determine adsorbed cobalt amount at different temperature
levels and heavy metal concentration. Differences between various time and
temperatures levels were found statistically significant, however, there were no
significant differences between time level. R2 values of the models ranged from 70% to
99%. In addition, cubic model had higher R2 values for each concentration and
temperature levels. Cobalt concentration and amount of ions have been increased in
the solution. The performance of all models to determine the amount of adsorption of
cobalt has been significantly found. However, model the best performance has been
shown with the cubic.