El Qada, E., Jordanian Journal of Engineering and Chemical Industries, 2020.

Abstract :

  The main intention of this work is to study the adsorption rate and mechanism for the adsorption of Malachite Green dye (MG) onto Jordanian diatomite. A series of experiments were conducted under a variety of conditions such as mass of diatomite, initial MG concentration and pH of solution. The mechanism of adsorption was elucidated based on different kinetic models. Experimental conditions showed a considerable effect on the adsorption rate.  Alkali conditions promote MG uptake and increase the rate of adsorption. Approximately 99% of dye removal was achieved as the diatomite dosage increased from 0.25g to 1.5g. The adsorption rate-controlling step was found to be a combination of chemisorption and intraparticle diffusion, with the external mass transfer predominating in the first five minutes of the experiment.