Optimization of conditions for Cr (VI) adsorption in aqueous media using
metal-organic frameworks
Yerkezhan Amangeldinova, Dimaral Aben, Mannix Balanay*
Department of Chemistry, School of Science and Technology, Nazarbayev University,
Astana, Kazakhstan
Email: [email protected], [email protected]
Abstract
Various techniques were developed for removal of heavy metal pollutant Cr (VI), including
adsorption which is considered as a promising method due to its efficiency, simplicity,
economic and environmental feasibility. Recently, metal-organic frameworks (MOFs) are
gaining greater attention as promising adsorbents due to their porous structure and tunable
physicochemical properties. This work is aimed at optimizing experimental conditions for Cr
(VI) adsorption in aqueous media using MOFs. Herein, zinc and cobalt based MOFs doped
with carbon dots (CDs) derived from carrot were synthesized by solvothermal method and
tested for Cr (VI) adsorption from aqueous solution. Obtained products were characterized
using SEM, XRD, FT-IR, BET and TGA. The concentration of Cr (VI) was measured using
UV-visible spectrometer by 1, 5-diphenylcarbazide method. CoMOF@CD showed better
removal performance and higher adsorption capacity, 24% and 6.1mg/g respectively in 10 ppm
Cr (VI) solution. The optimal conditions for the adsorption were 15 min contact time, agitation
speed of 350 rpm, and initial pH= 4.
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