Removal of Pb(2+) and Fe(3+) from water using N-TiO2 blended copolymer grafted asymmetric membranes.
The aim of this study was to evaluate the photo-catalytic properties of nitrogen-doped titanium dioxide nano-particles supported on polymer membranes in the photo-reduction of Fe(3+) and Pb(2+) from synthetic wastewater. The morphology of the prepared N-TiO2 nanoparticles was evaluated using transmission electron microscopy. Successful grafting of methacrylic acid side chains onto poly(vinylidene difluoride) (PVDF) backbone was confirmed by Fourier-transform infrared spectroscopy. The photo-catalytic asymmetric membranes were prepared through the dry-wet phase inversion technique. The asymmetric morphology was evaluated using scanning electron microscopy. The highest Fe(3+) photo-reduction efficiency (76.2%) was achieved in 6 hours using 1% N-TiO2-PMAA-g-PVDF/PAN (PMAA: poly(methacrylic acid); PAN: poly(acrylonitrile)) asymmetric membrane under solar irradiation. Increasing the photo-catalyst loading to 3% was found to negatively impact the photo-reduction of Fe(3+). Very high photo-reduction efficiencies were observed in the photo-reduction of Pb(2+) using 1% N-TiO2-PAN, 1% N-TiO2-PMAA-g-PVDF/PAN and 1% N-TiO2-PVDF membranes (90.5%, 88.9% and 86.9%, respectively) under similar conditions. Increasing the photo-catalyst loading to 3% N-TiO2 was observed to slightly increase the photo-reduction efficiency in the removal of Pb(2+) unlike in the case of Fe(3+). The best support material for the N-TiO2 photo-catalyst was PMAA-g-PVDF/PAN.
Chemistry Department, University of Fort Hare, 1 King Williams Town Road, Alice 5700, Republic of South Africa E-mail: henrymungondori@gmail.com.
Henry H
HH
Mungondori
Department of Polymer Technology and Engineering, Harare Institute of Technology, Ganges Road, Belvedere, Zimbabwe.
Lilian
L
Tichagwa
Chemistry Department, University of Fort Hare, 1 King Williams Town Road, Alice 5700, Republic of South Africa E-mail: henrymungondori@gmail.com.
David M
DM
Katwire
D000181:Acrylonitrile; D002384:Catalysis; D007501:Iron / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008567:Membranes, Artificial; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009584:Nitrogen / Q000737:chemistry*; D011108:Polymers; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification
D008567:Membranes, Artificial; D011108:Polymers; D014874:Water Pollutants, Chemical; D014867:Water; C009495:titanium dioxide; D007854:Lead; D014025:Titanium; D007501:Iron; D000181:Acrylonitrile; D009584:Nitrogen