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Fabrication and characterization of grapheme oxide-poly(vinyl alcohol) nanocomposite

Fabrication and characterization of grapheme oxide-poly(vinyl alcohol) nanocomposite / Quah Jia Xin

Abstract Proses penyejattelapan merupakan teknologi membran yang baru dan proses ini sering diselidik untuk tujuan penyahhidratan alkohol. Bagi projek ini, kesan penambahan graphene oksida (GO) dalam membran yang diperbuat daripada poli(vinil alkohol) (PVA) untuk tujuan penyahhidratan etanol telah dikaji. GO sebanyak 0.05wt% dan 0.20wt% telah ditambah ke dalam membran PVA yang tulen untuk mengkaji kesan tambahannya. Analisis termogravimetri menunjukkan bahawa penambahan kepingan GO ke dalam membran PVA telah meningkatkan keupayaan membran untuk menahan suhu yang tinggi. Suhu penguraian untuk membran 0.05wt% GO/PVA telah meningkat sebanyak 16C berbanding dengan membran PVA tanpa GO. Tambahan pula, membran PVA yang ditambah dengan kepingan GO juga mampu mengurangkan peratus perkembangan membran apabila direndam dalam larutan etanol dengan 5wt% air. Peratus perkembangan membran berkurang daripada 9.447% kepada 8.913% dan 8.851% untuk membran 0.05wt% GO/PVA dan 0.20wt% GO/PVA masing-masing. Apabila diuji dengan proses penyejattelapan, keputusan menunjukkan bahawa penambahan jumlah kepingan GO yang sesuai dalam membran PVA mampu meningkatkan jumlah fluks yang meresapi melalui membran. Walau bagaimanapun, apabila kandungan GO yang dimasukkan adalah terlalu tinggi, jumlah fluks berkurang dengan ketara dan nilai tersebut adalah lebih rendah berbanding dengan nilai yang dihasilkan oleh membran PVA. Proses penyejattelapan telah dijalankan pada suhu 30C menggunakan larutan etanol yang mengandungi 5wt% air. Keputusan menunjukkan bahawa membran 0.05wt% GO/PVA mencapai prestasi penyejattelapan yang terbaik dengan nilai PSI berjumlah 14023 dan jumlah fluks bersamaan dengan 43.1g/m2h berbanding dengan nilai membran PVA yang mencapai hanya PSI berjumlah 6059 dan jumlah fluks bersamaan dengan 23.1g/m2h. _______________________________________________________________________________________________________ Pervaporation process has been an emerging membrane technology that finds its application in dehydration of alcohol. In this project, the effect of incorporating graphene oxide (GO) sheets into poly(vinyl alcohol) (PVA) membrane for dehydration of ethanol was studied. GO sheets of 0.05wt% and 0.20wt% were added into the pure PVA matrix to study their effect. It was found that the addition of GO sheets into PVA membrane leads to enhanced thermal properties of the membrane based on the thermogravimetric analysis. The decomposition temperature of 0.05wt% GO/PVA membrane was increased by approximately 16C as compared to that of pure PVA membrane. Furthermore, the modified PVA membranes with GO sheets also showed a decrease in degree of swelling when immersed in 5wt% of water in ethanol solution from 9.447% to 8.913% and 8.851% for 0.05wt% GO/PVA and 0.20wt% GO/PVA membranes, respectively. When the synthesized membranes were tested with pervaporation process, the results showed that the addition of suitable amount of GO sheets into PVA membrane increases the total permeate flux. However, when the GO content was too high, the total permeate flux was reduced significantly and was lower than that of pure PVA membrane. Pervaporation process was conducted using 5wt% of water in ethanol solution at 30C. The results showed that the 0.05wt% GO/PVA membrane achieved the best pervaporation performance with PSI of 14023 and total permeate flux of 43.1g/m2h as compared to PSI of 6059 and total permeate flux of 23.1 g/m2h by pure PVA membrane.

Contributor(s): Quah Jia Xin - Author Primary Item Type: Final Year Project Identifiers: Barcode : 00003103816 Accession Number : 875006387 Language: English Subject Keywords: Pervaporation process; membrane technology; dehydration of alcohol First presented to the public: 6/1/2016 Original Publication Date: 5/17/2018 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Chemical Engineering Citation: Extents: Number of Pages - 70 License Grantor / Date Granted:   / ( View License ) Date Deposited 2018-05-17 15:33:20.619 Date Last Updated 2019-01-07 11:24:32.9118 Submitter: Mohd Jasnizam Mohd Salleh

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