title: Titanium dioxide nanofibers integrated stainless steel filter for photocatalytic degradation of pharmaceutical compounds.
abstract: A photocatalytically active stainless steel filter (P-SSF) was prepared by integrating electrospun TiO2 nanofibers on SSF surface through a hot-press process where a poly(vinylidene fluoride) (PVDF) nanofibers interlayer acted as a binder. By quantifying the photocatalytic oxidation of cimetidine under ultraviolet radiation and assessing the stability of TiO2 nanofibers integrated on the P-SSF against sonication, the optimum thickness of the TiO2 and PVDF layer was found to be 29 and 42 μm, respectively. At 10L/m(2)h flux, 40-90% of cimetidine was oxidized when the thickness of TiO2 layer increased from 10 to 29 μm; however, no further increase of cimetidine oxidation was observed as its thickness increased to 84 μm, maybe due to limited light penetration. At flux conditions of 10, 20, and 50 L/m(2) h, the oxidation efficiencies for cimetidine were found to be 89, 64, and 47%, respectively. This was attributed to reduced contact time of cimetidine within the TiO2 layer. Further, the degradation efficacy of cimetidine was stably maintained for 72 h at a flux of 10 L/m(2) h and a trans-filter pressure of 0.1-0.2 kPa. Overall, our results showed that it can potentially be employed in the treatment of effluents containing organic micropollutants.
authors.affiliation: Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Subramaniyan
authors.initials: S
authors.lastname: Ramasundaram
authors.forename: Ha Na
authors.initials: HN
authors.lastname: Yoo
authors.forename: Kyung Guen
authors.initials: KG
authors.lastname: Song
authors.forename: Jaesang
authors.initials: J
authors.lastname: Lee
authors.forename: Kyoung Jin
authors.initials: KJ
authors.lastname: Choi
authors.forename: Seok Won
authors.initials: SW
authors.lastname: Hong
mesh_terms: D002384:Catalysis; D002927:Cimetidine / Q000737:chemistry / Q000528:radiation effects; D005374:Filtration; D008027:Light; D057139:Nanofibers / Q000737:chemistry*; D010084:Oxidation-Reduction; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D055668:Photochemical Processes; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D004364:Pharmaceutical Preparations; D014753:Vinyl Compounds; D013193:Stainless Steel; C009495:titanium dioxide; C007384:1,1-difluoroethylene; D002927:Cimetidine; D014025:Titanium