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RISS 인기검색어
- 검색키워드
- 저자 : A. Suganthi (검색결과 3 건)
- 무료
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K. Vignesh,M. Rajarajan,A. Suganthi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Nickel (Ni) and thorium (Th) co-doped zinc oxide (ZnO) nanoparticles were prepared by the coprecipitation method. The synthesized nanoparticles were characterized using UV–visible diffuse reflectance spectroscopy (UV–vis DRS), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron spectroscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) techniques. The photocatalytic activity of the prepared catalysts was evaluated by the degradation of methylene blue (MB) dye under visible light irradiation. XRD and SEM results revealed that Ni–Th–ZnO has a hexagonal and rods like morphology with an average crystallite size of 30 nm. Ni–Th–ZnO possesses excellent photocatalytic activity for the degradation of MB when compared to that of Ni–ZnO, Th–ZnO, ZnO and TiO2. The photocatalytic activity of Ni–Th–ZnO is obviously affected by the reaction parameters. The maximum MB degradation (93% with 70% COD removal) was achieved with Ni–Th–ZnO concentration of 0.375 g/L, initial MB concentration of 1.5 mM, pH 10 and irradiation time of 180 min. A possible photocatalytic mechanism has also been proposed. Moreover, the photocatalyst could be reused for four times without remarkable loss of its activity.
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K. Vignesh,A. Suganthi,M. Rajarajan,R. Priyanka,R. Hariharan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
CdS and CuWO4 modified TiO2 nanoparticles (CdS–CuWO4-TiO2) were prepared by the chemicalimpregnation method. The as-prepared nanoparticles were characterized using UV–visible-diffusereflectance spectroscopy (UV–vis-DRS), powder X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS) and B.E.T. surface area analysis techniques. The photocatalytic activity was evaluated based on the degradation of adye (eosin-Y) and inactivation of a bacterium (Pseudomonas aeruginosa). The results revealed that CdS–CuWO4-TiO2 showed high photocatalytic activity over CdS-TiO2, CuWO4-TiO2 and TiO2. Moreover thereusability and stability of the photocatalyst for the degradation of eosin-Y was also studied.
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S. Selvarajan,P. Malathy,A. Suganthi,M. Rajarajan 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Novel UV–vis-light-driven BaTiO3/SnO2 nanocomposites with three different molar ratios (1%, 3%, 5%) were synthesized by hydrothermal and precipitation deposition methods. The successfully characterized by UV-visible diffuse reflectance spectroscopy (DRS), FT-IR spectroscopy, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), photoluminescence spectroscopy (PL), and Brunauer–Emmett–Teller surface area analysis (BET) techniques. The lmax of the prepared nanocomposite was highly red shifted from 220 nm to 410 nm compared to the bare metal oxides. The degradation of organic pollutants such as o-Chloroaniline (o-CLA) and methylene blue (MB) were studied using the prepared nanocomposite. The nanocomposite with molar ratio of 3% BaTiO3/SnO2 photocatalyst possesses excellent photocatalytic activity than the nanocomposite with molar ratio 1% BaTiO3/SnO2, 5% BaTiO3/SnO2, and the individual components BaTiO3, SnO2. The band edges of materials have been theoretically calculated on the basis of Mullikan electronegativity of atoms. The effect of operational parameters such as; pollutant concentration, pH, catalyst loading, OH radical trapping and COD (carbon oxygen demand) have been investigated in details. The kinetics of the photodegradation reactions were correlated with the pseudofirst- order model. The stability of nanocomposite was examined by recycling experiments.
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