Modeling of adsorption and ultrasonic desorption of cadmium(II) and zinc(II) on local bentonite

The statistical analysis shows that solid/liquid ratio (X1), contact time (X2), pH (X3) and temperature (X6) have positive effects, whereas metal concentration (X4), stirring speed (X5) have negative effects on Cd(II) adsorption by untreated bentonite.