Development And Characterization Of Asymmetric Nanofiltration Surfactant Membranes For Ion Removal
In this study a new formulation of dope solution consisting of polyethersulfone, Nmethyl-2-pyrrolidone, water and surfactant were formulated from 19 to 27 wt% of PES concentration. The polyvinyl-pyrrolidone additive (PVP K15) and surfactant (Triton X-100) were added into the dope solution as pore fo...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | en_US |
| Subjects: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In this study a new formulation of dope solution consisting of polyethersulfone, Nmethyl-2-pyrrolidone, water and surfactant were formulated from 19 to 27 wt% of PES concentration. The polyvinyl-pyrrolidone additive (PVP K15) and surfactant (Triton X-100) were added into the dope solution as pore former and to improve the membraneporosity, respectively. Moreover, to fabricate the nanofiltration-surfactant (NFS)membrane, the evaporation time factor was induced during the casting process. At the operating pressures ranging from 100 to 500 kPa and Milipore filtration cell, the membranes performance were evaluated in terms of pure water permeability, water flux and salts rejection. From this study, experimental data showed that the membrane prepared from polymer concentration of 20.42 wt% (optimum) exhibited of high water flux ranging from 6.30 x 10-6m3/m2s to 8.94 x 10-6m3 / m2s, 3.26 x 10-6 m3 /m 2s of salt permeation and good NaCl rejection of 43.10%. Meanwhile, the addition of 2 wt% of PVP K15 additive and 3 wt% of Triton X-100 roduced higher salt permeation (3.61 10-6 m3 /m 2 s ) and more selective membrane (46.94%). Besides that, membranes performance properties data revealed that the evaporation factor was found to be very significant and strongly affected toward separation improvement and properties enhancement. The highest salt rejection of about 59.38% achieved at evaporation time of 20s indicated that the high selective asymmetric nanofiltration-surfactant membrane was succefully fabricated. In relations to the attained high separation performance, the newly fabricated NFS membrane was having of narrow pore size, good pore size distribution and fine asymmetrical structures. Therefore, with the packages of high separation performance, fine structural details, the fabricated NFS membrane also provided the excellent technical potentials towards membranes development and a great platform for the production of locally novel high performance nanofiltration-surfactant membranes for various applications in the future. |
|---|