Polystyrene nanofiber materials modified with an externally bound porphyrin photosensitizer

0392424 - ÚACH 2014 RIV US eng J - Journal Article
Henke, P. - Lang, Kamil - Kubát, Pavel - Sýkora, Jan - Šlouf, Miroslav - Mosinger, Jiří
Polystyrene nanofiber materials modified with an externally bound porphyrin photosensitizer.
ACS Applied Materials and Interfaces. Roč. 5, č. 9 (2013), s. 3776-3783. ISSN 1944-8244. E-ISSN 1944-8252
R&D Projects: GA ČR GAP208/10/1678; GA ČR GBP208/12/G016; GA ČR GA13-12496S
Institutional support: RVO:61388980 ; RVO:61388955 ; RVO:61389013
Keywords : nanofiber * porphyrin * singlet oxygen * adsorption * photooxidation * antibacterial
Subject RIV: CA - Inorganic Chemistry; CD - Macromolecular Chemistry (UMCH-V); CF - Physical ; Theoretical Chemistry (UFCH-W)
Impact factor: 5.900, year: 2013

Polystyrene ion-exchange nanofiber materials with large surface areas and adsorption capacities were prepared by electrospinning followed by the sulfonation and adsorption of a cationic 5,10,15,20-tetrakis(1-methylpyridinium- 4-yl)porphyrin (TMPyP) photosensitizer on the nanofiber surfaces. The morphology, structure, and photophysical properties of these nanofiber materials were characterized by microscopic methods and steady-state and time-resolved fluorescence and absorption spectroscopies. The externally bound TMPyP can be excited by visible light to form triplet states and singlet oxygen O 2(1Δg) and singlet oxygen-sensitized delayed fluorescence (SODF). The photophysical properties of the nanofibers were strongly dependent on the amount of bound TMPyP molecules and their organization on the nanofiber surfaces. The nanofibers demonstrated photooxidative activity toward inorganic and organic molecules and antibacterial activity against E. coli due to the sensitized formation of O2( 1Δg) that is an effective oxidation/cytotoxic agent. The nanofiber materials also adsorbed heavy metal cations (Pb2+) and removed them from the water environment.
Permanent Link: http://hdl.handle.net/11104/0221341