Sorption kinetics of organic dyes methylene blue and malachite green on highly porous carbon material
Year: 2023
Type: article
Abstract: In the article, the purpose of the research was to determine the important parameters of the organic compounds sorption – synthetic dyes methylene blue (MB) and malachite green (MG), on mesoporous carbon (MPC) from aqueous solutions in a limited volume. For the sorbent used, the elemental composition and the BET surface area were determined by nitrogen adsorption, which amounted to 2360 m2⋅g–1. Absorption mechanisms were analyzed using kinetic dependences and sorption isotherms, for which empirical equations of pseudo-first and -second order, the Elovich equation and the intraparticle diffusion equation, as well as Langmuir, Freindlich, Dubinin-Radushkevich equations were used. In the course of kinetic studies, it was found that equilibrium occurs after 15 min of extraction with an adsorption capacity of 2446.6 mg⋅g–1 for MB and 2043.1 mg⋅g–1 for MG. It should be noted that the extraction of dye molecules proceeded predominantly by a mixed-diffusion mechanism and was controlled by a second-order reaction by a pseudo-second order model. The activation energy was 0.016 kJ⋅mol–1 for MG molecules, and 0.013 kJ⋅mol–1 for MB ones, which confirmed the physical mechanism of dye uptake. Thus, in the course of experimental studies, the high efficiency of the developed sorbent for the purification of aqueous systems from organic compounds was confirmed.
Authors: Ali Kadum, Irina Burakova, Elina Mkrtchyan, Oksana Ananyeva, Vladimir Yarkin, Alexander Burakov, Alexey Tkachev
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4409765799