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Diffusion Permeability of Cation-Exchange Membrane in Different Solutions

Gubari Mohammed Qader, Abdulkarim Abdullah Adnan, Alekseeva Nadezda Vyacheslavovna

Journal of Ecological Engineering

2021

Vol. 22, nr 8

140--145

This work is devoted to study the effect of thermal conditions and concentrations on the diffusion permeability of a cation exchange membrane (MK-40) using sodium chloride (NaCl), sodium acetate (C2H3NaO2) and acetic acid (CH3COOH) solutions, which are usually highly concentrated components of pigment yellow 13 of industrial wastewater. A cell containing two compartments was used to analyze the properties of membrane. The results showed that the maximum diffusion permeability coefficients for NaCl, C2H3NaO2, and CH3COOH were 6.08×10-9 m2/s, 13.29×10-11 m2/s, and 25.95×10-11 m2/s, respectively. The increase in the CH3COOH solution concentration was found to improve the diffusion permeability. However, the NaCl and C2H3NaO2 solutions exhibited decreases in diffusion permeability with solution concentration. There was a significant increase in diffusion permeability with temperature.

Prevention of Hydrosphere Contamination with Electroplating Solutions through Electromembrane Processes of Regeneration

Serdiuk Vasyl, Sklabinskyi Vsevolod, Bolshanina Svetlana, Ableyev Alexey, Dychenko Tetiana

Journal of Ecological Engineering

2020

Vol. 21, nr 4

61--69

The work studies the process of Сd2+ and Zn2+ cations transfer through a RALEX®CM-PES 11–66 cation-exchange membrane and the cations reduction as metals on the cathodes at the cathode chambers of the electrochemical units with a view to prevent the hydrosphere contamination with the electroplating solutions. Electrolysis of the solutions that imitated the possible composition of the passivating baths contained 50 g/l sodium dichromate, 10 g/l sulfuric acid and impurity ions of Сd2+ and Zn2+ in various concentrations. The designed passivation solutions with certain amount of impurity ions in the colour solution were forcibly mixed. The impact of the impurity ions concentration in the colour solution and of a forced mixing on the metal reduction was studied. Regularity in the increased metal reduction dependent on the metal concentration was found and the conditions favouring the ion migration through the cation-exchange membrane due to forced mixing were defined.

Evaluation of cation exchange membranes for pertraction processes

Szczepański P., Wódzki R.

Zeszyty Naukowe. Chemia / Politechnika Śląska

2001

z. 146

235-238

Przedmiotem badań był wpływ fizykochemicznych właściwości kationowymiennych membran polimerowych (CEM) na pertrakcję kationów w wielomembranowym układzie hybrydowym (MHS). Układ składał się z sekwencji membran kationowymiennych z kwasowymi grupami sulfonowymi oraz membrany ciekłej (BLM): CEM-BLM-CEM. Membranę ciekłą stanowił roztwór kwasu di-(2-etyloheksylo) fosforowego w nafcie. Podstawą oceny membran były strumienie kationów Zn2+, Cu2+, Ca2+, Mg2+, K+, Na+ osiągane w procesie transportu konkurencyjnego.