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Teli S.B.,University of Alcala | Molina S.,Institutute Of Ciencia Y Teccbnlogia Of Polimeros | Sotto A.,Rey Juan Carlos University | Calvo E.G.,University of Alcala | De Abajo J.,Institutute Of Ciencia Y Teccbnlogia Of Polimeros
Industrial and Engineering Chemistry Research

To avoid particle agglomeration and to improve membrane antifouling property, commercial TiO2 particles were modified with polyaniline (PANI) by in situ polymerization. SEM and FTIR analysis confirmed the incorporation of PANI on the surface of the TiO2 particles. The average size of PANI/TiO2 nanoparticles is in the range of 10-67 ± 3 nm. The preparednanoparticles are used as surface and inner nanofiller additives and dispersed into the polysulfone (PSf) to obtain ultrafiltration nanocomposite membranes via phase inversion method. The surface hydrophilicity of nanocomposite membrane increases with increasing nanoparticles (0 to 1.5 wt %) concentrations. The membrane morphology indicates that nanocomposite membranes exhibited larger surface pore size, higher porosity, more finger-like pores, and less macrovoids than the control PSf membrane. The experimental results indicate that the 1.0 wt % of PANI/TiO2 content membrane depicted excellent hydrophilicity, water permeability, and better antifouling property with high rejection. Bovine serum albumin and humicacid were used as model foulants. The protein adsorption study showed that PANI/TiO2 content membranes adsorbed more at the isoelectric point of BSA solution and decreased as the solution pH increases. Higher nanoparticles content (1.5 wt %) membrane outcomes are elucidated and affected and resulted in significant particle agglomeration. Finally, obtained experimental results show that the nanocomposite membranes have higher flux and better antifouling property than the control PSf membrane. © 2013 American Chemical Society. Source

Teli S.B.,University of Alcala | Molina S.,Institutute Of Ciencia Y Teccbnlogia Of Polimeros | Calvo E.G.,University of Alcala | Lozano A.E.,Institutute Of Ciencia Y Teccbnlogia Of Polimeros | de Abajo J.,Institutute Of Ciencia Y Teccbnlogia Of Polimeros

Novel polyaniline (PANI)/phosphomolybdicacid (PMA) nanoparticles were prepared by simple protonation method and used to enhance the antifouling property of polyethersulfone (PES) ultrafiltration membranes. The prepared nanoparticle size around 30 ± 3 nm was confirmed by transmission electron microscopy and scanning electron microscopy analyses. Complete PMA incorporation with PANI was evaluated by Fourier transform infrared spectroscopy analysis. The surface charge of nanoparticles are average value is of - 46 mV. The contact angle, water flux and flux with rejection of protein of all membranes increased by increasing nanoparticle concentrations in the range of 0, 2, 3, 5 and 7 wt.% into casting solution. Compared to pure PES membrane, the PES-PANI/PMA membrane exhibits better antifouling performance with very high (> 98.8%) protein rejection rate. Especially, the 3 wt.% PANI/PMA nanoparticles incorporated membrane shown superior results than other membranes. The roughness of PES-PANI/PMA membranes are remarkably enhanced due to the drastic enrichment of nanoparticle segments on the membrane surface. Bovine serum albumin (BSA) was used as a model protein to investigate the protein adsorption resistivity and permeation properties of all membranes. BSA ultrafiltration experiment showed that PES-PANI/PMA membranes had higher flux and better antifouling property than PES membrane. © 2012. Source

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