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Zeta Potential of Reverse Osmosis Membranes: Implications for Membrane Performance.

PB97127450

Publication Date	1996
Personal Author	Elimelech, M.; Childress, A. E.
Page Count	80
Abstract	This report, presents data and analysis of the streaming potentials of four different types of membranes measured using an electrokinetic analyzer. Three reverse osmosis membranes and one thin film composite nanofiltration membrane were analyzed. The reverse osmosis membranes consisted of an asymmetric cellulose acetate blend, a fully aromatic polyamide thin-film composite, and a thin film composite with enhanced rejection. Zeta potentials were calculated from the measured streaming potential using the Helmholtz-Smoluchowski equation. Results show that all membranes display an iso-electric point at an acidic pH; the zeta potentials is megatively charged at pH values above the iso-electric point and is positively charges at lower pH. Measurements were also made in the presence of divalent ions and humic substances.
Keywords	Reverse osmosis Membranes Electrochemistry Membrane potentials Charge density Isoelectric focusing Filtration Transport properties Particles Desalination Fluid flow Humic acids Surfactants Filters Electrokinetics Performance evaluation ZETA potential Streaming potential Nanofiltration Divalent ions
Source Agency	Bureau of Reclamation
NTIS Subject Category	50B - Civil Engineering 99F - Physical & Theoretical Chemistry 49 - Electrotechnology
Corporate Authors	California Univ., Los Angeles. Dept. of Civil and Environmental Engineering.; Bureau of Reclamation, Denver, CO. Water Treatment Engineering and
Supplemental Notes	Also pub. as Bureau of Reclamation, Denver, CO. Water Treatment Engineering and Research Group rept. no. WATER TREATMENT TECHNOLOGY-10. Sponsored by Bureau of Reclamation, Denver, CO. Water Treatment Engineering and Research Group.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199707
Contract Number	DIBR-1425-4-CR-81-19290

Zeta Potential of Reverse Osmosis Membranes: Implications for Membrane Performance.

Zeta Potential of Reverse Osmosis Membranes: Implications for Membrane Performance.
PB97127450

Publication Date	1996
Personal Author	Elimelech, M.; Childress, A. E.
Page Count	80
Abstract	This report, presents data and analysis of the streaming potentials of four different types of membranes measured using an electrokinetic analyzer. Three reverse osmosis membranes and one thin film composite nanofiltration membrane were analyzed. The reverse osmosis membranes consisted of an asymmetric cellulose acetate blend, a fully aromatic polyamide thin-film composite, and a thin film composite with enhanced rejection. Zeta potentials were calculated from the measured streaming potential using the Helmholtz-Smoluchowski equation. Results show that all membranes display an iso-electric point at an acidic pH; the zeta potentials is megatively charged at pH values above the iso-electric point and is positively charges at lower pH. Measurements were also made in the presence of divalent ions and humic substances.
Keywords	Reverse osmosis Membranes Electrochemistry Membrane potentials Charge density Isoelectric focusing Filtration Transport properties Particles Desalination Fluid flow Humic acids Surfactants Filters Electrokinetics Performance evaluation ZETA potential Streaming potential Nanofiltration Divalent ions
Source Agency	Bureau of Reclamation
NTIS Subject Category	50B - Civil Engineering 99F - Physical & Theoretical Chemistry 49 - Electrotechnology
Corporate Authors	California Univ., Los Angeles. Dept. of Civil and Environmental Engineering.; Bureau of Reclamation, Denver, CO. Water Treatment Engineering and
Supplemental Notes	Also pub. as Bureau of Reclamation, Denver, CO. Water Treatment Engineering and Research Group rept. no. WATER TREATMENT TECHNOLOGY-10. Sponsored by Bureau of Reclamation, Denver, CO. Water Treatment Engineering and Research Group.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199707
Contract Number	DIBR-1425-4-CR-81-19290