title: Photodegradation of perfluorooctanoic acid by synthesized TiO2-MWCNT composites under 365nm UV irradiation.
abstract: Degradation of perfluorooctanoic acid (PFOA) is of great importance due to its global distribution, persistence and toxicity to bioorganisms. In present study, a composite TiO(2) with multiple wall carbon nanotubes (MWCNTs) was synthesized using sol-gel method and it was used as photocatalyst to degrade PFOA in water. The prepared composite catalyst displayed significant absorption in UV to visible light region. The loading content of TiO(2) on MWCNTs could be adjusted by changing the ratio of precursor to MWCNTs. Due to the combined effect of the adsorption ability and e(-) transport capacity of MWCNT, the composites displayed much higher photocatalytic ability to PFOA as compared to pure TiO(2) under UV irradiation. The photocatalyst prepared with 10:1 of tetrabutyl titanate/MWCNT was the most effective. With the optimal dosage at 1.6 g L(-1), almost 100% of PFOA was degraded in acid medium after irradiation for 8h. It was proposed that PFOA were mainly degraded by stepwise losing a moiety of CF(2).
authors.affiliation: College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Nankai University, Tianjin, PR China.
authors.forename: Chao
authors.initials: C
authors.lastname: Song
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: Chunying
authors.initials: C
authors.lastname: Wang
authors.forename: Lingyan
authors.initials: L
authors.lastname: Zhu
mesh_terms: D002210:Caprylates / Q000737:chemistry* / Q000302:isolation & purification; D002384:Catalysis; D004785:Environmental Pollutants / Q000737:chemistry* / Q000302:isolation & purification; D005466:Fluorocarbons / Q000737:chemistry* / Q000302:isolation & purification; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D002210:Caprylates; D004785:Environmental Pollutants; D005466:Fluorocarbons; D037742:Nanotubes, Carbon; C009495:titanium dioxide; C023036:perfluorooctanoic acid; D014025:Titanium