Preparation and performance of ultra-thin surface coated pervaporation membranes for seawater purification

In this study, ultra-thin poly(ether-block-amide, PEBA)-coated poly(vinyl alcohol, PVA) composite membranes were prepared and assessed for the removal of lead, zinc, lithium, arsenic, and copper from seawater. Effects of the coating numbers and temperature on flux and ion rejection were evaluated. T...

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Bibliographic Details
Published in:Water science & technology. Water supply 2019-09, Vol.19 (6), p.1778-1784
Main Author: Nigiz, F. U.
Format: Article
Language:English
Subjects:
Alcohols
Arsenic
Coating
Coating processes
Coatings
Copper
Desalination
Energy consumption
Fluctuations
Flux
Heavy metals
Ions
Lead
Lithium
Magnesium
Membrane separation
Membranes
Permeability
Pervaporation
Polymers
Polyvinyl alcohol
Purification
Rejection
Removal
Saline water
Science
Seawater
Sodium
Thickness
Water purification
Zinc
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Summary:In this study, ultra-thin poly(ether-block-amide, PEBA)-coated poly(vinyl alcohol, PVA) composite membranes were prepared and assessed for the removal of lead, zinc, lithium, arsenic, and copper from seawater. Effects of the coating numbers and temperature on flux and ion rejection were evaluated. The number of coating processes increased the thicknesses of the membranes. The ion rejection and water flux decreased with the increasing coating process. Dissolved ions were retained with a rejection of >99.5%. The highest rejections of 99.99% and 99.98% were obtained for sodium and magnesium ions. The coated PVA membranes showed a superior heavy-metal removal greater than 88%. The highest rejection improvements were obtained for zinc (Zn), lithium (Li), and copper (Cu) metals. The zinc, copper, and lithium rejections increased from 89.1%, 88.3%, and 85.1% to 95.3%, 98.46% and 94.4% due to the PEBA coating process, respectively. The influence of PVA thickness on the flux and rejection was also investigated. Increasing the thickness of PVA decreased the flux. The highest flux of 2.34 kg/m2.h was obtained with the membrane having a thickness of 90 µm.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2019.053