Youth Chemistry Conference 2nd Youth Chemistry Conference booklet | Page 11

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. References 1. S. Yang, et.al. Appl. Surf. Sci. 457 (2018) 1208-1217. 2. Z. Yao, G. Li, J. Xu, T. Hu, X. Bu. Chem. Eur. J. 24 (2018) 3192-3198. 3. J. Li, et.al. ACS Appl. Mater. Interfaces. 10 (2018) 16650-16659. 4. M. Samuel, et.al. Composites Part B. 152 (2018) 116-125.