Influence of micelle properties on micellar-enhanced ultrafiltration for chromium recovery

An investigation of micelle properties on the recovery of chromium for micellar enhanced ultrafiltration (MEUF) process was conducted using cationic surfactant of cetyltrimethylammonium bromide (CTAB). The relationship between degree of ionization, micellar sizes and chromium removal were determined...

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Bibliographic Details
Published in:Water science and technology 2015-12, Vol.72 (11), p.2045-2051
Main Authors: Nguyen, Hau Thi, Chang, Wen-Shing, Nguyen, Nguyen Cong, Chen, Shiao-Shing, Chang, Hau-Ming
Format: Article
Language:English
Subjects:
Agglomeration
Aggregation
Attraction
Cations
Cetrimonium Compounds - chemistry
Cetyltrimethylammonium bromide
Chromate
Chromates
Chromium
Chromium - chemistry
Chromium - isolation & purification
Copper
Cut-off
Desalination
Efficiency
Electrolytes
Gels
Influence
Ionization
Micelles
Molecular weight
Molecular weight distribution
Pollutants
Pore size
Porosity
Properties
Recovery
Removal
Studies
Surface-Active Agents - chemistry
Surfactants
Ultrafiltration
Ultrafiltration - instrumentation
Ultrafiltration - methods
Weight
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Summary:An investigation of micelle properties on the recovery of chromium for micellar enhanced ultrafiltration (MEUF) process was conducted using cationic surfactant of cetyltrimethylammonium bromide (CTAB). The relationship between degree of ionization, micellar sizes and chromium removal were determined in this study. The results showed that the complete ionization for CTA+ and Br- was observed for CTAB lower than 0.72 mM and aggregation initiated at concentration of CTAB higher than 0.72 mM to yield attraction of counterion. The micellar sizes increased with increase in concentration of CTAB (higher than 4.02 mM) to generate micron-sized micelles. The distribution of micellar sizes was used to estimate the molecular weight cutoff of membrane used in the MEUF process. As chromium was added into aqueous CTAB solution, the chromate was dominant and bound on the micellar surface instead of Br-. Moreover, the presence of micelle formed a gel-layer to slightly shrink the membrane pore, therefore, UF membrane of 30k Da molecular weight cutoff (pore size≈7.9 nm) was selected in the MEUF process to achieve the removal efficiency of Cr(VI) higher than 95%.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.370