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%.
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Research Article|
August 14 2015
Influence of micelle properties on micellar-enhanced ultrafiltration for chromium recovery
Hau Thi Nguyen;
1Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd. Taipei 106, Taiwan, ROC
E-mail: f10919@ntut.edu.tw
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Wen-Shing Chang;
Wen-Shing Chang
1Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd. Taipei 106, Taiwan, ROC
2Environmental Protection Administration, No.83, Sec. 1, Zhonghua Rd., Zhongzheng District, Taipei 100, Taiwan, ROC
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Nguyen Cong Nguyen;
Nguyen Cong Nguyen
1Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd. Taipei 106, Taiwan, ROC
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Shiao-Shing Chen;
Shiao-Shing Chen
1Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd. Taipei 106, Taiwan, ROC
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Hau-Ming Chang
Hau-Ming Chang
1Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd. Taipei 106, Taiwan, ROC
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Water Sci Technol (2015) 72 (11): 2045–2051.
Article history
Received:
February 13 2015
Accepted:
July 03 2015
Citation
Hau Thi Nguyen, Wen-Shing Chang, Nguyen Cong Nguyen, Shiao-Shing Chen, Hau-Ming Chang; Influence of micelle properties on micellar-enhanced ultrafiltration for chromium recovery. Water Sci Technol 1 December 2015; 72 (11): 2045–2051. doi: https://doi.org/10.2166/wst.2015.370
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