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.