Vahid Jabbari - Preparation of novel hetero-nanostructures and high efficient visible light-active photocatalyst using incorporation of CNT as an electron-transfer channel into the support TiO 2 and PbS

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  Publication Details (including relevant citation   information):

  Journal of the Taiwan Institute of Chemical Engineers 44 (5),   748-757


  A series of novel visible light-active photocatalysts of   TiO2/CNT and PbS/CNT were prepared by simple   wet-chemical method and the resulting materials were used for   degradation of methyl orange (MO) as probe pollutant. The   reactive substances used to decorate the PbS quantum dots (QDs)   with the diameters of ca. 6–10 nm located onto the   CNT substrate, were lead acetate (Pb(CH3COOH)) and   Thiourea (NH2CSNH2) aqueous solution at   90 °C. The physic-chemical properties of the resulting   photocatalysts were characterized by SEM-EDX, TEM, XRD, FTIR, and   UV–vis DRS spectroscopy. It was found that the size, shape, and   coverage density of the PbS QDs and TiO2 nanoparticles   (NPs) onto the CNT can be controlled through varying synthesis   conditions. As a result, the experiments demonstrated   photodegradation efficiency of ∼100% of MO, for   TiO2/CNT and PbS/CNT, under 20 and 45 min UV   light irradiation time, respectively, and also 30 and 80 min   under visible light irradiation time, respectively. In addition,   the possible decomposing mechanisms were also discussed. The   results of the current study showed the feasible and potential   use of high efficient CNT:TiO2:PbS photocatalyst in   photodecomposition of toxic organic pollutants. As the   above-mentioned results show, the use of CNT in photocatalyst   systems is not only enhances the optical properties of   TiO2 and PbS photocatalysts, but also improve their   capability in photodegradation of organic pollutants.

  Address (URL): doi:10.1016/j.jtice.2013.01.018