A novel rotated disc electrode and time lag method for characterizing mass transport in liquid-membrane systems

AIChE Journal ◽  
1980 ◽  
Vol 26 (6) ◽  
pp. 1013-1019 ◽  
Author(s):  
David A. Gough ◽  
John K. Leypoldt
Keyword(s):  
Mass Transport ◽  
Liquid Membrane ◽  
Time Lag ◽  
Membrane Systems ◽  
Disc Electrode

Liquid Membrane Systems

2018 ◽  
pp. 163-172
Author(s):  
J. W. Frankenfeld ◽  
N. N. Li
Keyword(s):  
Liquid Membrane ◽  
Membrane Systems

Heavy metals removal from wastewaters of phosphoric acid production: a comparison of hybrid liquid membrane (HLM) and aqueous hybrid liquid membrane (AHLM) technologies

2001 ◽  
Vol 1 (5-6) ◽  
pp. 119-129 ◽  
Author(s):  
V. Kislik ◽  
A. Eyal
Keyword(s):  
Heavy Metals ◽  
Phosphoric Acid ◽  
Cation Exchange ◽  
Liquid Membrane ◽  
Membrane Resistance ◽  
Water Soluble ◽  
Separation System ◽  
Membrane Systems ◽  
Membrane Pore ◽  
Cyanex 302

Selective removal of heavy metal ions from industrial wet-process phosphoric acid (WPA) was studied, using the two liquid membrane systems: Hybrid Liquid Membrane (HLM) and Aqueous Hybrid Liquid Membrane (AHLM). Monothiophosphinic acid (Cyanex 302) in kerosene (for the HLM) and Polyvinylsulfonic acid (PVSA) aqueous solution (for the AHLM) were used as a liquid membrane (LM), separated from the feed and strip streams by neutral or cation-exchange membranes. On application of the HLM separation system, the permeation from the feed to the strip phase followed the selectivity sequence: Zn >> Cd > Cu with all types of membranes used. Results show that the selective separation of Cd and Zn from the WPA may be achieved by the HLM with cation-exchange membranes, using a single set-up installation at continuous processing. Copper is accumulated in the Cyanex 302, poisoning the carrier. So, this carrier and HCl as a strip solution can not be recommended for the HLM processing of WPA. Using the AHLM separation system, heavy metals such as cadmium and copper, were successfully recovered from the WPA: average fluxes (in mol/m2sec) to the strip phase were 3.7 × 10-7 and 6.7 × 10-7. Satisfactory dynamic selectivity to copper (≈16) was found. The transfer of iron and zinc species to the strip phase was below detection levels during the 144 hrs of the AHLM experiment. Contamination of the feed and strip solutions by PVSA was not observed during the 500 hrs of processing. The membranes were completely regenerable and used repeatedly. In comparison with the HLM and other liquid membrane systems, the AHLM can potentially provide many operational, economic and environmental advantages, some of them being higher transport rates, low carrier losses and low contamination of the feed and strip solutions by water-soluble polymers, long membrane lifetime, ambient temperature, low energy requirements and chemical consumption, no special requirements for membrane resistance in organic solvents, and fewer limitations on the variability of membrane pore sizes, etc.

Mass transport and modulation effects in rocking dual-semi-disc electrode voltammetry

2014 ◽  
Vol 722-723 ◽  
pp. 78-82 ◽  
Author(s):  
Sunyhik D. Ahn ◽  
Paul E. Frith ◽  
Adrian C. Fisher ◽  
Alan M. Bond ◽  
Frank Marken
Keyword(s):  
Mass Transport ◽  
Disc Electrode
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