Nanoparticle CdS-Sensitized TiO2 Catalyst for Photo-Degradation of Water Organic Contaminants: Feasibility Assessment and Natural-Dye Alternatives

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dc.contributor.authorAhed Zyoud
dc.contributor.authorNidal Zatar
dc.contributor.authorIyad Saadeddin
dc.contributor.authorHiKmat Hilal
dc.date.accessioned2017-05-03T09:36:37Z
dc.date.available2017-05-03T09:36:37Z
dc.date.issued2011-05-04
dc.description.abstract<p>The photocatalytic degradation of organic contaminants (such as industrial dyes, insecticides, pesticides, … etc) in water, using TiO2 under UV are commonly used procedures. Modifying TiO2 with CdS is also a common technique used for water purification under visible light. In this work both commercial and prepared TiO2 were used for photo-degradation of two model contaminants, methyl orange (MO) and phenazpyridine (PhPy). In order to sensitize TiO2 to visible light, a chemical pathdeposition method (CBD) was used to precipitate non-scale (~20 nm) CdS particles on TiO2 particle surfaces. Sand was used as a supporting surface for the TiO2/CdS catalyst. UV-visible spectra, photoluminescence emission spectra, XRD and SEM imaging were measured to characterize the prepared catalyst systems. Effects of catalyst concentration, initial contaminant concentration and pH on photo-degradation rate were studied. Turnover number and quantum yield were also calculated for comparison study. Despite the high efficiency of TiO2/CdS catalyst system in degrading water contaminants, voltametric analysis confirmed complete CdS decomposition during the photo-degradation process. Due to hazardous nature of resultingCd2+ in the treated water, an alternative sensitizer has been suggested based on natural nontoxic dyes. Anthocyanin was used here for the first time as a sensitizer for the rutile TiO2 system. Activated Carbon (AC) was also used as supporting substrate. Electronic absorption spectra, FT-IR spectra, and TGA analysis were used to characterize the prepared TiO2/Anthocyanine catalyst systems. The efficiency of the new catalyst system, in photo-degradation ofMO and PhPY was assessed. An observable efficiency was noted specially when using AC/TiO2/Anthocyanin atlow pH in photo-degradation of MO.Details of results, discussions and suggested mechanisms will be presented in this presentation</p>en
dc.description.abstract<p>The photocatalytic degradation of organic contaminants (such as industrial dyes, insecticides, pesticides, … etc) in water, using TiO2 under UV are commonly used procedures. Modifying TiO2 with CdS is also a common technique used for water purification under visible light. In this work both commercial and prepared TiO2 were used for photo-degradation of two model contaminants, methyl orange (MO) and phenazpyridine (PhPy). In order to sensitize TiO2 to visible light, a chemical pathdeposition method (CBD) was used to precipitate non-scale (~20 nm) CdS particles on TiO2 particle surfaces. Sand was used as a supporting surface for the TiO2/CdS catalyst. UV-visible spectra, photoluminescence emission spectra, XRD and SEM imaging were measured to characterize the prepared catalyst systems. Effects of catalyst concentration, initial contaminant concentration and pH on photo-degradation rate were studied. Turnover number and quantum yield were also calculated for comparison study. Despite the high efficiency of TiO2/CdS catalyst system in degrading water contaminants, voltametric analysis confirmed complete CdS decomposition during the photo-degradation process. Due to hazardous nature of resultingCd2+ in the treated water, an alternative sensitizer has been suggested based on natural nontoxic dyes. Anthocyanin was used here for the first time as a sensitizer for the rutile TiO2 system. Activated Carbon (AC) was also used as supporting substrate. Electronic absorption spectra, FT-IR spectra, and TGA analysis were used to characterize the prepared TiO2/Anthocyanine catalyst systems. The efficiency of the new catalyst system, in photo-degradation ofMO and PhPY was assessed. An observable efficiency was noted specially when using AC/TiO2/Anthocyanin atlow pH in photo-degradation of MO.Details of results, discussions and suggested mechanisms will be presented in this presentation</p>ar
dc.identifier.urihttps://hdl.handle.net/20.500.11888/9455
dc.titleNanoparticle CdS-Sensitized TiO2 Catalyst for Photo-Degradation of Water Organic Contaminants: Feasibility Assessment and Natural-Dye Alternativesen
dc.titleNanoparticle CdS-Sensitized TiO2 Catalyst for Photo-Degradation of Water Organic Contaminants: Feasibility Assessment and Natural-Dye Alternativesar
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International Graduate Conference on Science, Humanities and Engineering 2011 (IGCSHE2011)