Vahid Jabbari - Synthesis of cysteine, cobalt and copper-doped TiO2 nanophotocatalysts with excellent visible-light-induced photocatalytic activity

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        Charge separation is a vital process in order to achieve high   performance TiO2-based photocatalysts. In the current study, to   enhance the charge separation and suppress the charge   recombination, novel nanocomposites of metal (Co and Cu) and   nonmetal (C, N, S) doped TiO2 nanophotocatalyst (labeled as   Co@C,N,S-doped TiO2 and Cu@C,N,S-doped TiO2) were synthesized via   photochemical deposition-assisted sol-gel technique. The   crystalline structures and characteristic of the prepared   catalysts were analyzed by XRD, SEM, TEM, EDAX, PL, and UV-vis   DRS spectroscopies. The photocatalytic performance of the samples   was tested through decomposition of methyl orange (MO) aqueous   solutions under UV and visible light irradiation. It was found   that photodeposition of metals onto TiO2 slowed charge   recombination compared to pure TiO2 in addition to formation of   higher concentration of OH radicals on the TiO2 photocatalyst   surface during light irradiation compared to pure TiO2. Beyond   the optimum content of 2 wt% Cu and Co, a decline in   photocatalytic performance was observed which was ascribed to   metal agglomeration and blockage of the photosensitive TiO2   surface.

      Address (URL): 10.1016/j.mssp.2015.06.085