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      Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV-Visible light radiations

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      Author(s)
      Mittal, M.
      Sharma, M.
      Pandey, O. P.
      Date
      2016
      Source Title
      Solar Energy
      Print ISSN
      0038-092X
      Electronic ISSN
      1471-1257
      Publisher
      Elsevier Ltd
      Volume
      125
      Pages
      51 - 64
      Language
      English
      Type
      Article
      Item Usage Stats
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      283
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      Abstract
      Undoped and Manganese (Mn) doped zinc oxide (ZnO) (Zn1- xMnxO, x=0.005, 0.01, 0.015 and 0.02) nanoparticles (NPs) capped with (1.0%) Thioglycerol (TG) has been successfully synthesized by co-precipitation method. Optical and morphological studies have been done for photophysical and structural analysis of synthesized materials. The photocatalytic activity of undoped and Mn doped ZnO NPs were investigated by degradation of crystal violet (CV) dye under UV-Visible light radiations. It has been found that Mn (1.0%) doping concentration is optimal for photophysical and photocatalytic properties. When the pH of as synthesized optimum doped ZnO NPs varied from natural pH i.e. from 6.7 to 8.0 and 10.0, the degradation of CV dye increases from 92% to 95% and 98% in 180min respectively. Further on increasing the pH of optimum doped synthesized NPs to 12.0, almost 100% degradation has been achieved in 150min. Optimum doped photocatalyst synthesized at pH-12.0 has also effectively degraded the CV dye solution in acidic and basic medium thus showed its utility in various industries. However, it has been found that 100% of CV dye quickly degraded in 30min when only 1.0% of hydrogen peroxide (H2O2) was introduced along with optimized NPs synthesized at pH-12. Kinetic studies show that the degradation of CV dye follows pseudo first and second-order kinetic law. Further an industrial anionic polyazo Sirius red F3B (SRF3B) dye has been degraded to 100% with optimized NPs synthesized at pH-12.0 in 15min only.
      Keywords
      Doping
      Nanoparticles
      pH
      Photocatalytic degradation
      ZnO
      Doping (additives)
      Dyes
      Light
      Manganese
      Manganese oxide
      Nanoparticles
      Photocatalysis
      Photocatalysts
      Precipitation (chemical)
      Zinc
      Zinc oxide
      Coprecipitation method
      Doping concentration
      Photo catalytic degradation
      Photocatalytic activities
      Photocatalytic property
      Second order kinetics
      Synthesized materials
      ZnO
      Synthesis (chemical)
      Catalysis
      Chemical compound
      Dye
      Hydrogen peroxide
      Manganese
      Nanoparticle
      Oxide
      Photodegradation
      physicochemical property
      ultraviolet radiation
      visible spectrum
      Zinc
      Permalink
      http://hdl.handle.net/11693/36774
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.solener.2015.12.003
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      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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