Abstract
Synthetically convenient method for preparing phosphoryl podand 1,8-bis[2-(diphenylphosphorylmethyl)phenoxy]-3,6-dioxaoctane (L) has been developed. Recovery of Pb2+ with impregnated type sorbents was studied, the sorbents contain isodentate organic ligands—phosphoryl podand L and crown ether (4,4',(5')-di(tert-butyl)dicyclohexyl-18-crown-6)—as extractants. A sorbent based on the phosphoryl podand quantitatively extracts lead from neutral solutions (R = 98.4%) and does not recover it from acid solutions. On the contrary, the sorbents based on 4,4',(5')-di(tert-butyl)dicyclohexyl-18-crown-6 do not extract lead from neutral media and efficiently adsorb it from nitric and hydrochloric acid solutions (R = 90% from 3 M nitric acid solutions and R = 73.2% from 2 M hydrochloric acid solutions). Effect of diluent and support type, support pretreatment procedure, impregnation temperature and time, and solvent for support impregnation on lead sorption with sorbents based on 4,4',(5')-di(tert-butyl)dicyclohexyl-18-crown-6 have been studied.
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This work was supported by the Russian Foundation for Basic Research and the Government of Sevastopol city (project no. 18-43-920004 r_a), the Foundation for Promotion of Small Scientific and Technical Business (program Start-1, project no. S1-21807), by the Federal Agency of Scientific Organizations of Russian Federation (project no. 0827-2019-0003), and the Presidium of the RAS (program no. 14P).
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Bezhin, N.A., Dovhyi, I.I., Lyapunov, A.Y. et al. Impregnated Type Sorbents for Pb2+ Recovery from Neutral and Acidic Solutions. Russ. J. Inorg. Chem. 64, 1178–1185 (2019). https://doi.org/10.1134/S0036023619090031
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DOI: https://doi.org/10.1134/S0036023619090031