Electrochemical Characterization of Cellulose Acetate Membranes. 1. Influence of Hydrogen and Calcium Ions on the EMF of LiCl Concentration Cells with a CA-Membrane as Separator

1988 ◽  
Vol 13 (1) ◽  
Author(s):  
T. Smith Sørensen ◽  
J. Birger Jensen ◽  
B. Malmgren-Hansen
Keyword(s):  
Cellulose Acetate ◽  
Calcium Ions ◽  
Electrochemical Characterization ◽  
Cellulose Acetate Membranes ◽  
Concentration Cells

Effect of the structure of cellulose acetate membranes on their permeability, electrical conductivity and rejection

1990 ◽  
Vol 55 (12) ◽  
pp. 2933-2939 ◽  
Author(s):  
Hans-Hartmut Schwarz ◽  
Vlastimil Kůdela ◽  
Klaus Richau
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Cellulose Acetate Membrane ◽  
Structure Parameters ◽  
Dc Electrical Conductivity ◽  
Cellulose Acetate Membranes

Ultrafiltration cellulose acetate membrane can be transformed by annealing into reverse osmosis membranes (RO type). Annealing brings about changes in structural properties of the membranes, accompanied by changes in their permeability behaviour and electrical properties. Correlations between structure parameters and electrochemical properties are shown for the temperature range 20-90 °C. Relations have been derived which explain the role played by the dc electrical conductivity in the characterization of rejection ability of the membranes in the reverse osmosis, i.e. rRO = (1 + exp (A-B))-1, where exp A and exp B are statistically significant correlation functions of electrical conductivity and salt permeation, or of electrical conductivity and water flux through the membrane, respectively.

scholarly journals Electrochemical Characterization of Cellulose Acetate/Chitosan Membrane in Presence and Absence of Nonionic Surfactant in Monovalent Electrolytic Solution

2021 ◽  
Vol 33 (11) ◽  
pp. 2693-2699
Author(s):  
Satya Nath ◽  
A.K. Tiwari ◽  
P.K. Tiwari
Keyword(s):  
Membrane Potential ◽  
Cellulose Acetate ◽  
Theoretical Method ◽  
Electrochemical Characterization ◽  
Tween 20 ◽  
Electrolytic Solution ◽  
Chitosan Membrane ◽  
Flow Flux ◽  
Tween 60

The influence of surfactant on cellulose acetate/chitosan membrane has been investigated. A basic approach to cellulose acetate/chitosan membrane is also mentioned. Nonionic surfactants are disrupted the normal permeability of the characteristic membrane. Electrochemical characterization such as conductance, flow, flux and permeability are measured in various concentrations of the electrolyte and surfactants. Membrane potential is determined by the combination of the properties of ions of the electrolyte, surfactant and membrane. The synthesized membrane was found to be cation selective with measured membrane potential found to be negative in all cases. The value of membrane potential was varying in different concentration of the electrolyte and surfactant. The Teorell Meyer and Sievers (TMS) theoretical method was employed for calculating the Transport number, perm selectivity and fixed charge density of the membrane by using the data of membrane potential across normal and surfactant modified membrane with electrolytic solution of NaCl. The variation of fixed density and perm selectivity also depends on the concentration of the electrolyte and surfactant (Tween 20 and Tween 60).

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