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Novel Nanofiltration Membranes of Poly(4-Chlorostyrene)-grafted-1-(4-thiocarbamoylaminophenyl-sulfonylphenyl)thiourea and Gold/Polystyrene Composite Nanoparticle

Ayesha Kausar

Abstract


In the current research poly(4-chlorostyrene) grafted with thiourea-based diamine (1-(4-thiocarbamoylaminophenylsulfonylphenyl) thiourea) (PCS-g-DA) was prepared. The nanofiltration membrane of PCS-g-DA was prepared using tetrahydrofuran as solvents via phase inversion method. For the reinforcement purpose gold nanoparticles and its composite nanoparticles with polystyrene microspheres (AuNPs-PSNPs) have been designed and studied using transmission electron microscopy. Cross-section and internal fractured PCS-g-DA/AuNPs-PSNPs membrane surfaces were characterized by scanning electron microscopy. Nanoporous membrane morphology was observed at increased nanofiller loading. The membrane property study revealed higher pure water permeation flux, recovery and solute rejection for membranes with higher AuNPs-PSNPs content. The PCS-g-DA/AuNPs-PSNPs membrane with 1 wt. % loading showed flux of 17.4 mLcm−2 min−1 and salt rejection ratio of 72.2 %. In addition glass transition temperature, porosity, and water uptake of membranes were increased with filler loading. The tensile strength was increased from 29.5-37.6 MPa in PCS-g-DA/AuNPs-PSNPs 0.1-1 membranes. Efficiency of the gold/polystyrene nanoparticles reinforced membranes was found to be 99 % for the removal of Hg2+ and Pb2+. According to the results, the composite membranes have fine nanofiltration characteristics to be utilized in advance water treatment industrial units.


Keywords


Nanofiltration; poly(4-chlorostyrene); morphology; tensile strength; flux

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References


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