| 1 | Synthesis,characterization and application of ZnO-Ag as a nanophotocatalyst for organic compounds degradation,mechanism and economic study显示文摘The current work deals with ZnO-Ag nanocomposites(in the wide range of x in the Zn1-x O-Ag x chemical composition) synthesized using microwave assisted solution combustion method.The structural, morphological and optical properties of the samples were characterized by XRD(X-ray diffraction), FTIR(Fourier transform infrared spectrometry), SEM(scanning electron microscopy technique), EDX(energy dispersive X-ray spectrum), ICP(inductively coupled plasma technique), TEM(transmission electron microscopy), BET(Brunauer–Emmett–Teller method), UV–Vis(ultraviolet–visible spectrophotometer) and photoluminescence spectrophotometer. The photocatalytic activity of the ZnO-Ag was investigated by photo-degradation of Acid Blue 113(AB 113) under UV illumination in a semi-batch reactor. This experiment showed that ZnO-Ag has much more excellent photocatalytic properties than ZnO synthesized by the same method. The enhanced photocatalytic activity was due to the decrease in recombination of photogenerated electron-holes. The results showed the improvement of ZnO photocatalytic activity and there is an optimum amount of Ag(3.5 mol%) that needs to be doped with ZnO.The effect of operating parameters such as p H, catalyst dose and dye concentration were investigated. The reaction byproducts were identified by LC/MS(liquid chromatography/mass spectrometry) analysis and a pathway was proposed as well. Kinetic studies indicated that the decolorization process follows the first order kinetics. Also, the degradation percentage of AB113 was determined using a total organic carbon(TOC) analyzer. Additionally, cost analysis of the process, the mechanism and the role of Ag were discussed. | S.Mohammadzadeh M.E.Olya A.M.Arabi A.Shariati M.R.Khosravi Nikou | 2015 | Journal of Environmental Sciences2015，27，9： | 3 |
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