A method for separation of ethylene glycol (EG) and alkali metal salts in aqueous solutions is developed using solid-phase extraction on carbon nanotubes (CNT) and dialysis with a domestic mosaic membrane AK-45. Both methods enable effective separation of the components of EG + NaCl (KCl) aqueous solution which is necessary for gas chromatographic determination of EG in the mixtures. Hydrophobic-hydrophilic interactions in the EG – water – CNT system provide efficient sorption of EG and almost zero sorption of potassium chloride by CNT. Coefficients of EG and KCl separation on Dealtom carbon nanotubes range within 7 – 15 (for 0.001 ≤C0 EG≤ 0.1, 0.001 ≤C0 KCl≤ 0.1 mol/liter), EG extraction rate is 86 – 94% for single extraction. CNT practically do not absorb potassium chloride. High and low permeability of mosaic membranes for metal salts EG, respectively, is a basis for separation of EG and alkali metal salts by dialysis. During a 4-hour dialysis, 96% and 87% of NaCl (C0= 0.001 mol/dm3andC0= 0.01 mol/dm3, respectively), are transferred as NaCl through the AK-45 membrane (86% and 82% for KCl). At the same time an amount of less than 3% EG (C0= 0 mol/dm3) is transferred during dialysis through AK-45 membrane. Mosaic membrane AK-45 appeared to be the most effective one regarding the transfer of alkali metal salts from low-mineralized aqueous solutions, unlike traditional ion-exchange membranes in the absebce of such transfer due to the Donnan phenomenon. Coefficients of alkali metal chloride and EG separation by dialysis with an AK-45 membrane range within 13 – 38, which indicates to their rather efficient separation.
Исследованы изотермы адсорбции l-аминокислот на углеродных наночастицах. Выявлена максимальная адсорбция l-аминокислот на углеродных нанотрубках. Установлено, что изотермы адсорбции l-аминокислоты не имеют перегиба, имеют 1 плато, и, по классификации Брунауэра относятся к I типу изотерм адсорбции, следовательно, можно говорить о мономолекулярной сорбции. Предположительно, исследуемые аминокислоты адсорбируются конечными участками нанотрубок.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.