Effect of tannic acid-trimesoyl chloride on thin film composite membrane

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Date
2018-07-01
Authors
Riza Asma'a Saari
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Abstract
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.
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