Kesan penambahan MWCNT, CuBTC dan komposit CuBTC-MWCNT sebagai aditif tambahan dalam lapisan electrospun untuk dehidrasi 1,4-dioksana telah dikaji. Dalam projek ini, sejenis “Metal Organic Framework” atau Rangka Logam-Organik (MOF), iaitu CuBTC dan kompositnya, CuBTC-MWCNT dihasilkan. MOFs dan MWCNT telah digunapakai sebagai aditif hidrofilik untuk dimasukkan ke dalam fiber poli (vinil alkohol), seterusnya menghasilkan gabungan fiber komposita atas lapisan padat poli (vinik alkohol). Matriks campuran membran komposit akan berfungsi sebagai lapisan selektif untuk pemisahan 1,4 dioksana-sistem / air menggunakan kaedah pevaporasi. Daripada kajian yang telah dijalankan, kristal CuBTC dan komposit CuBTC-MWCNT berjaya dihasilkan. Kristal CuBTC dengan formula molekul Cu3(BTC)2 mempunyai pusat tembaga berkeadaan pengoksidaan 2, dan mempunyai bentuk tetrahidron. Kristal didapati berukuran 5-15μm panjang, luas permukaan spesifik berjumlah 17,1308 m2/g dan 129,7114 m2/g untuk CuBTC dan CuBTC-MWCNT masing-masing.. Nanofiber PVA yang dihasilkan melalui kaedah penejaman elektro didapati berukuran 212.9nm diameter pada jarak operasi 15cm, dan berkurangan apabila kompun tambahan ditambah ke dalamnya. Secara keseluruhan, membran matriks campuran didapati menunjukkan prestasi yang baik untuk kes di mana CuBTC digunakan sebagai bahan pengisi untuk lapisan electrospun tersebut. Faktor pemisahan untuk CuBTC berdasarkan electrospun matriks bercampur didapati berjumlah 80500, dengan jumlah fluks 16.96g/m2.h.
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The effects of adding MWCNT, CuBTC and CuBTC-MWCNT composite as fillers in the electrospun layer for dehydration of 1, 4-dioxane were studied. In this project, a type of metal organic framework (MOF), CuBTC, and a composite, CuBTC-MWCNT were created. These MOFs along with MWCNT were used as hydrophilic fillers to be incorporated within poly(vinyl alcohol) nanofibres, which would eventually be spun onto a dense poly(vinyl) alcohol membrane. The mixed matrix composite membrane would serve as a selective barrier for dehydration of 1,4-dioxane/water system through pervaporation. From the study conducted, CuBTC crystals were successfully synthesized, along with the composite CuBTC-MWCNT composite. CuBTC crystals with the molecular formula Cu3(BTC)2 has a copper centre with an oxidation state of 2, and possesses a tetrahedron shape. These crystals are found to be about 5-15μm in length, with a specific surface area of 17.1308 m2/g and 129.7114 m2/g for CuBTC and CuBTC-MWCNT respectively. Electrospun PVA fibres are found to be 212.9nm in diameter at 15cm, and decreases as fillers are added into it. Overall, the mixed matrix membrane is found to perform well for the case where CuBTC was used as filler for the electrospun layer. The separation factor for CuBTC based electrospun mixed matrix is found to be 80500, with a total flux of 16.96g/m2.h.
Synthesis of electrospun poly(vinyl alcohol) based pervaporation membranes incorporated with multi-walled carbon nanotubes and metal organic framework / Lim Fung Khiang