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Morphology and performance evaluation of polyethersulfonezinc oxide (PESzno) mixed matrix membrane fabricated using non solvent additive

Morphology and performance evaluation of polyethersulfonezinc oxide (PESzno) mixed matrix membrane fabricated using non solvent additive / Jayasree Sugumaran
Dalam kajian ini, kesan zarah nano dalam membran yang diubahsuai digunakan tambahan „bukan pelarut‟ dikaji. Nisbah aseton/NMP akan dimanipulasikan dan kesan daripada manipulasi kepada morpologi dan prestasi membran akan diperhati, nisbah aceton/NMP yang menunjukkan prestasi baik akan digunakan untuk memfabrikasikan membran matriks campuran dengan zarah nano Zink Oksida (ZnO). Tambahan aseton dalam membran menghasilkan membran yang berkulit tebal dan juga yang mempunyai lompang macro berupa jejari. Tambahan aseton juga meningkatkan penolakan tetapi mengurankan fluks air tulen. Membran yang diperbadankan dengan aseton mengurangkan hidrofilik dan kekasaran permukaaan jua sedikit menurun. Membran yang diubahsuai oleh aseton mempunyai permukaan kulit yang ketat dengan keliangan dan saiz liang yang kecil boleh mengurangkan kesan kotoran. Nilai nisbah pemulihan fluks untuk nisbah aseton/NMP 0.05 adalah 97.93% tetapi nilai ini berkurang sebanyak 24.92% apabila nisbah aseton/NMP adalah 0.20. Membran difabrikasi dengan zarah nano ZnO dan aseton boleh meningkatkan kesan hidrofilik dan keliangan, oleh itu , fluks air tulen meningkat. Tetapi kekotoran yang tidak dapat dipulih meningkat apabila 0.5 peratus berat ZnO digunakan dibandingkan dengan membrane dengan aseton sahaja kerana adanya liang yang buka (Saiz liang dan keliangan tinggi). Walau bagaimanapun, nilai nisbah pemulihan fluks akan terus bertambah dengan peningkatan ZnO kerana kesan hidrofilik mengurangkan penyerapan Humik asid. Mekanisma penyekatan liang PES/NMP/Aseton dan PES/NMP/Aseton/ZnO dikaji berdasarkan model penyekatan liang. Penapisan kek merupakan mekanisma penyekatan liang yang paling dominan dalam kedua-dua membran pada fasa yang awal (20 min) dan fasa akhir (21min hingga 60 min). Tetapi, nilai pekali untuk penentuan, R2 untuk model penyekatan liang yang lain jua hampir sama denga penapisan kek, oleh itu, kotoran boleh berlaku hasil daripada gabungan semua model ini. _______________________________________________________________________________________________________ The effect of nanoparticles (NPs) in the non solvent additive modified membrane is studied in this paper. The ratio of acetone/NMP is manipulated and its effect to morphology and performance of membrane is observed and the best performing ratio of acetone/NMP is used to fabricate a mixed matrix membrane with ZnO-NPs. Addition of acetone results in thick skin layer followed by reduced finger like macrovoids which improved the rejection but decreased pure water flux. Acetone incorporation into membrane reduces hydrophilicity while, the surface roughness decrease slightly. The tight skin layer with reduced porosity and pore size of acetone modified membrane can minimize the fouling effect. The FRR value of acetone/NMP ratio of 0.05 is as high as 97.93 % but the value decreased by 24.92% when the ratio of solvent is 0.20. High concentration of acetone reduce the hydrophilicity cause several fouling. The incorporation ZnO-NPs into the NSA modified membrane can improve the hydrophilicity and porosity, hence the pure water flux improves. But, the irreversible fouling of membrane with 0.5 wt.% of ZnO increase significantly compared to the membrane with acetone alone which is again due the open pore in ZnO modified membrane. But, the Flux Reduction Ratio (FRR) values improves with the increase of ZnO, as the membrane become hydrophilic reduce the humic acid adsorption.The pore blocking behaviour PES/NMP/Acetone and PES/NMP/Acetone/ZnO are evaluated based on 4 pore blocking models. The cake filtration is the dominant pore blocking cause for both membrane at initial (20 min) and final stage (21 min to 60 min). But, the coefficient of determination, R2 value for other pore blocking models is nearly same as the cake filtration so, fouling may be due the combination of all the models.
Contributor(s):
Jayasree Sugumaran - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875007525
Language:
English
Subject Keywords:
nanoparticles (NPs); non-solvent; membrane
First presented to the public:
6/1/2018
Original Publication Date:
7/18/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 96
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-07-30 16:41:42.016
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Mohd Jasnizam Mohd Salleh

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Morphology and performance evaluation of polyethersulfonezinc oxide (PESzno) mixed matrix membrane fabricated using non solvent additive1 2018-07-30 16:41:42.016