Effect Of Tannic Acid-Trimesoyl Chloride On Thin Film Composite Membrane

• Main Author: Saari, Riza Asma'a
• Format: Thesis
• Language: English
• Published: 2018
• Subjects: T Technology; TP1-1185 Chemical technology
• Online Access: http://eprints.usm.my/44293/1/Effect%20Of%20Tannic%20Acid-Trimesoyl%20Chloride%20On%20Thin%20Film%20Composite%20Membrane.pdf; http://eprints.usm.my/44293/

Membran komposit filem nipis telah disediakan melalui proses sintesis antara larutan asid tannik dalam fasa cecair dan trimesoil klorida dalam fasa organik. Hasil kajian daripda penyelidik sebelum ini seperti Zhang et., al (2013) dan Tang et., al (20008) menunjukkan isu pengotoran dan kestabilan khususnya pada membran UF ketika proses penurasan protein. Oleh itu, teknik pempolimeran antara lapisan muka (IP) telah digunakan untuk mengkaji hubungan diantara kesan asid tannik dan trimesoil klorida terhadap prestasi rintangan kadar pencemaran, hidrofilik dan sifat pemisahan air pada membran komposit filem nipis. Fungsi asid tannik dan trimesoil klorida (TA-TMC) dengan tahap kepekatan berbeza pada sifat-sifat membran seperti ikatan kimia, morfologi, kekasaran permukaan, sifat hidrofilik dan prestasi ketelepan air serta penolakan protein (Albumin serum bovin dan Lisozim) juga turut dikaji. Keputusan menunjukkan bahawa peningkatan kepekatan asid tannik dan trimesoil klorida semasa proses pempolimeran antara muka dapat mengurangkan kekasaran permukaan dan mengurangkan kerosakan pada permukaan membran komposit akibat tindak balas pempolimeran yang berlebihan. Selain itu, pembentukan lapisan poliester juga didapati boleh mempengaruhi tahap sifat hidrofilik, tahap kadar pencemaran dan ujian prestasi membran. Secara kesuluruhannya, keputusan prestasi terbaik keseluruhan telah dicapai menggunakan membran komposit yang dihasilkan dengan kadar kepekatan 0.5 g/L asid tannik dan 0.3g/L trimesoil klorida yang seterusnya membawa kepada fluks air tulen sebanyak 114.16 Lm-2h-1 serta penolakan BSA dan Lisozim masing-masing sebanyak 98% dan 94%. Dalam kajian ini, kesan kepekatan asid tannik dan trimesoil klorida (TA-TMC) pada sifat hidrofilik membran dikaji. Proses pempolimeran semakin meningkat ekoran daripda peningkatan kepekatan asid tannik dan trimesoil klorida (TA-TMC) yang seterusnya menghasilkan nilai hydrofilik dengan lebih baik iaitu 29.70 serta memberi penambahbaikan pada kekasaran lapisan dengan struktur yang lebih sekata dari 73.96 nm kepada 30.07 nm. Penggunaan kepekatan asid tannik dan trimesoil klorida (TATMC) yang berbeza juga memberi kesan kepada kadar tindak balas yang berlaku pada permukaan membran seterusnya menyumbang kepada pembentukan kumpulan ester dan regangan O-H yang dapat diperhatikan dengan lebih jelas apabila kepekatan asid tannik dan trimesoil klorida (TA-TMC) meningkat. _______________________________________________________________________________________________________ A thin film composite membrane was prepared by synthesized the reacting tannic acid aqueous solution and trimesoyl chloride in organic phase. Previous research shows that fouling and stability issue on the UF membrane particularly during filtration of protein. Therefore, interfacial polymerization (IP) technique was employed to investigate the effect of tannic acid and trimesoyl chloride on the performances of anti-fouling resistance, hydrophilicity and permeation properties of thin film composite membrane. The role of tannic acid and trimesoyl chloride (TATMC) with various concentrations on membrane properties such as chemical bonding properties, morphology, surface roughness, hydrophilicity,and performance in term of water permeability and protein rejection (Bovine serum albumin and Lysozyme) were investigated, respectively. The results revealed that the increasing on the concentration of monomer during interfacial polymerization process could reduce the surface roughness and reduce the defect on the surface of composite membrane due to the intense polymerization reaction. Furthermore, the formation of polyester selective skin layer was also found to influence the hydrophilicity, fouling property and membrane performances tests. The best overall performance result were achieved with composite membrane produced by 0.5 g/L tannic acid and 0.3 g/L trimesoyl chloride leading to a pure water flux of 114.16 Lm-2h-1 and, BSA and Lysozyme rejection of 98 % and 94%, respectively. The effect of tannic acid and trimesoyl chloride (TA-TMC) on hydrophilicity of membrane is studied as well. Further polymerization process with increasing the tannic acid concentration (TA) improved the hydrophilicity to 29.70 and improved the roughness of layer with a more uniform structure from 73.96 nm to 30.07 nm. Different concentration of monomers (tannic acid and TMC) used also affect the different rates of cross-linking occurred on the surface of membrane that contribute towards the formation peak of ester group and O-H stretch which more clearly observed as the concentration of tannic acid and trimesoyl chloride (TA-TMC) increased.