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TiO 2 and TiO 2 doped with Zn 2+ , Cu 2+ and Cr 3+ were used as photocatalysts to reduce nitrate and to oxidize formic acid. The metals were added to the TiO 2 support by photodeposition and this method did not affect the form of the original crystalline semiconductor (100% anatase). The data obtained in the structural characterization and in the nitrate...
Dye-sensitized solar cells based on nano-porous TiO 2 photo-anode and quasi-solid polymer (or gel) electrolytes are emerging as low cost alternatives to conventional inorganic photovoltaic devices. Although many attempts have been made in order to improve the relatively low power conversion efficiencies of these solar cells, to our knowledge there are very few reports aimed at using a binary...
The fluorescence decay of rhodamine 6G (R6G) became biexponential when chemically derived few-layer graphene (CDG) is present, indicating the occurrence of new emitting species. To reveal the nature of the species, the binding behavior between CDG and R6G was studied by time-resolved, steady state fluorescence, UV–vis absorption methods and AFM. The addition of CDG caused the dramatic change in UV–vis...
The mesoporous multi-walled carbon nanotube (CNT)-embedded carbon nanofibers (CNT/Meso-ACNF) were prepared through various steps of electrospinning, stabilization, carbonization, SiO 2 template etching, and activation. The CNT/Meso-ACNF showed excellent mesoporous structure, excellent distribution of CNT, and good electrical conductivity in employing as catalysts of counter electrodes for...
The splitting quantum yields of the dimer by tethered chromophores exhibited different solvent effects. To further explore mechanism of the solvent effects, three covalently linked phenothiazine–dimer model compounds with a short linker, 1a–1c, were prepared. It was observed that solvent effect on dimer-splitting efficiency for phenothiazine–dimer systems is contrary to that of the other chromophore–dimer...
Hollow core–shell particles of a titania core and a silica shell, the latter of which was highly porous, water-swollen and not directly connected to the former, were synthesized by a multistep process including carbon and silica coatings followed by calcination of the carbon-layer combustion. The core–shell particles suspended in aqueous solutions of l-lysine showed improved stereoselectivity in photocatalytic...
Amino-acids are elemental constituents of microorganisms, e.g. bacteria, fungi, virus, mold, among others and are at the origin of the formation of odorous compounds after chlorination treatment due to the filtration of these microorganisms. Our study aims at studying the photocatalytic degradation of cysteine chosen as model of amino acid for understanding better the photocatalytic chemical pathway...
Spectroscopic and time-resolved fluorescence emission techniques were used to provide information for the interaction of 5,10,15,20-tetrakis(4-N,N,N-trimethylammoniumphenyl) porphyrin (TMAP 4+ ) and 5,10,15,20-tetrakis(4-sulphonatophenyl) porphyrin (TPPS 4− ) with different biomimetic media and with Candida albicans cells. In n-heptane/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/water...
The interaction of imidazolium based ionic liquids with calf thymus DNA has been investigated using a benzothiazole based ultrafast molecular rotor, Thioflavin-T, as a local reporter. It has been found that the addition of ionic liquid causes large reduction in the emission yield of the DNA bound probe indicating a strong interaction between the ionic liquids and DNA. Detailed studies show that the...
Photoinduced electron-transfer (PET) process of 1,8-naphthalimidelinkerTMS (NISOSTMS, where SOS=dithiaoxaundecyl and TMS=trimethylsilane) has been investigated using transient absorption measurements in CH 3 CN and CH 3 CN/H 2 O (v/v=9:1). The femtosecond pulsed laser excitation of NISOSTMS produced the NI radical anion (NI − ) with a transient absorption band around...
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