Supporting information for
High flux and high selectivity carbon nanotube composite membrane for natural organic matter removal Jieun Lee1, Yun Ye2, Antony Ward3, Cuifeng Zhou1, Vicki Chen2, Andrew. I. Minett1, Sanghyup Lee 4.5, Zongwen Liu1,*, So-Ryong Chae 1,6,* , Jeffrey Shi1 1 School of Chemical and Biomolecular Engineering, the University of Sydney, NSW 2006, Australia 2 UNESCO Centre for Membrane Science and Technology, School of Chemical Engineering, University of New South Wales, NSW Australia 3 School of Chemistry, the University of Sydney, NSW 2006, Australia 4 Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea 5 Graduate School of Convergence Green Technology & Policy, Korea University, Seoul 136 – 701, Republic of Korea 6 Department of Biomedical, Chemical, and Environmental Engineering, 701 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012, USA
* Address correspondence to either author. Z.Liu email:
[email protected]; phone: +61 2 9352 7535 ;S.R.Chae e-mail:
[email protected]; phone: +1 513 556 4353
Total pages: 7 excluding cover page Total Figures: 6
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SUPPORTING INFORMATION 2.4 Evaluation of filtration performance Pure water flux was evaluated in a high-pressure stirred cell (HP 4750, Sterlitech) under 1 bar at a room temperature. Water flux was calculated by the following equation: V
Jw = A×∆t
(2)
where Jw = water flux (L/m2/h, LMH), V = volume of permeate (L), A = effective surface area of the membrane (= 14.6 cm2), and Δt = permeation time (h). The rejection efficiency (R) was calculated by the following equation. 𝑅(%) =
𝐶𝑓 −𝐶𝑝 𝐶𝑓
× 100 (7)
where Cf is the concentration (mg/L) of latex particle or HA in the feed and Cp is the concentration (mg/L) of latex particles or HA in the membrane permeate.
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0 hr
30 min
3 hr
1 hr
6 hr
24 hr
Fig. S1. Snapshot shows dispersed MWCNTs/PANI in NMP over 24 h
(b)
(a)
Fig. S2. UV-Vis spectra of (a) the MWCNTs/PANI complex and MWCNTs in NMP, and (b) absorbance at 295 nm for 10 hours.
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Mag 3000 x
Mag 5000 x
Mag 10000 x
(a)
(b)
Fig. S3. SEM cross-sectional images of MWCNTs dispersion in PES polymer matrix: Crosssectional images of (a)the MWCNTs/PANI/PES membrane: MWCNTs are well-dispersed into the PES polymer and (b)the MWCNT/PES-1 (simply blended) membrane: MWCNTs are aggregated in the PES matrix.
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Fig. S4. Top down views of MWCNTs/PES-1 (simply blended) membrane show that MWCNTs are protruded from PES matrix.
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Fig. S5. SEM images of the PES membrane, PANI membrane and MWCNTs/PANI/PES membrane (a) Top down view, (b) Overall cross-sectional structure, (c) Cross section of top layer S6
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Fig. S6. Pore size distribution of membranes S8
