期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 217, 期 1, 页码 201-206出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2010.10.009
关键词
Heterogeneous photo-catalysis; Photo-Fenton; Wastewater treatment; Iron-immobilized polymer
资金
- Colombian Administrative Department of Science, Technology and Innovation (COLCIENCIAS) [1106-405-20154]
- EPFL
- UNIVALLE
Novel Fe supported catalysts were prepared by immobilizing iron species on commercial polyethylene via three different methods: (1) acidic pre-treatment of the polyethylene followed by impregnation in aqueous Fe(NO3)(3), (2) TiO2 photo-catalytic pre-treatment of the polyethylene followed by forced hydrolysis of Fe(NO3)(3), and (3) direct photo-Fenton attack with concomitant iron deposition on the polyethylene surface. The last method required soft conditions and led to the most photo-active Fe-polyethylene film. With this material, at a non-adjusted initial pH of 5.6 in the presence of H2O2, total degradation and 50% of resorcinol mineralization were observed in 40 and 60 min, respectively. Photo-Fenton functionalization/Fe-deposition process was also applied to polypropylene, high-impact polystyrene, and polymethylmethacrylate films. The efficiencies of all the prepared heterogeneous photo-catalysts were similar to that of an homogeneous photo-Fenton system containing the same amount of Fe3(+)/2(+) that leached during heterogeneous processes. That demonstrated than in our systems mainly homogeneous photo-Fenton reactions were responsible for the resorcinol degradation. The photo-catalytic activity observed for the Fe/polymer was a function of the specific polymer capacity to release the initially deposited iron into the solution. (C) 2010 Elsevier B.V. All rights reserved.
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