The Adsorption of Malachite Green on Graphene Nanocomposites: A Study on Kinetics Under Dynamic Conditions

The present paper examines the kinetics of the adsorption of the cationic dye, malachite green (MG), on polyhydroquinone (PHQ)/graphene and polyamine cumulene (PAC)/graphene nanocomposites representing graphene-oxide-based hybrid materials, in which p-benzoquinone and hexamethylenetetramine were use...

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Bibliographic Details
Main Authors: Mkrtchyan, Elina, Burakov, Alexandr, Burakova, Irina
Format: Conference Proceeding
Language:English
Subjects:
adsorption mechanisms
grapheme
kinetics
malachite green
nanocomposite
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Summary:The present paper examines the kinetics of the adsorption of the cationic dye, malachite green (MG), on polyhydroquinone (PHQ)/graphene and polyamine cumulene (PAC)/graphene nanocomposites representing graphene-oxide-based hybrid materials, in which p-benzoquinone and hexamethylenetetramine were used as modifier, respectively. Kinetic studies were carried out under dynamic conditions with a setup designed by the authors. The solution to be purified was continuously circulated through an adsorption cell, and its optical density was measured every 180 s using a spectrophotometer. The adsorption capacity of PHQ/graphene and PAC/graphene for MG was experimentally found to be 688.1 and 1,862.6 mg g-1, respectively Equilibrium in the systems was achieved in 57 min (PHQ/graphene) and 135 min (PAC/graphene). Results of the experimental studies were processed using diffusion models and chemical kinetic equations. Mathematical descriptions allowed establishing that the dye molecules are adsorbed on both materials by a complex mechanism - along with mixed diffusion adsorption, the molecules chemically interact with functional groups on the adsorbent surface.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2019.01.004