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RISS 인기검색어
- 검색키워드
- 저자 : Garadkar, K. M. (검색결과 3 건)
- 무료
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Kadam, Abhijit,Dhabbe, Rohant,Shin, Dong-Su,Garadkar, Kalyanrao,Park, Jinsub Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.6
<P><B>Abstract</B></P> <P>Environment-friendly photocatalysts under sunlight with wide spectral responses for wastewater treatment are currently an exciting area of research. Herein, we report the synthesis of Sn doped N-TiO<SUB>2</SUB> nanoparticles with different contents of Sn by a greener microwave assisted method. The phase purity, morphology, particle size, optical properties, and elemental composition were systematically analyzed by various sophisticated analytical techniques. The X-ray diffraction (XRD) patterns revealed Sn doped N-TiO<SUB>2</SUB> nanoparticles in the anatase phase. The shift of XRD peaks observed at lower angle and the XPS results indicate the successful doping of Sn<SUP>4+</SUP> in the lattice of N-TiO<SUB>2</SUB>. The optical absorption edges of Sn-doped N-TiO<SUB>2</SUB> showed an obvious red shift that plays a crucial role in the photocatalytic activity under abundant sunlight. We further explored Sn doped N-TiO<SUB>2</SUB> for photodegradation of methyl orange (MO) and Zopiclone (Z-class drug) under sunlight irradiation. A maximum of 95% and 91% of MO and Zopiclone were photodegraded over 0.25% Sn doped N-TiO<SUB>2</SUB> under sunlight within 80 and 120min, respectively, which is ∼7-fold higher than bare N-TiO<SUB>2</SUB>. The enhanced photocatalytic activity could be attributed to combined effects of reduced crystallite size, suppressed recombination rate of photogenerated electron-hole pairs, and increased optical absorption towards visible light that establish their impending use to treat polluted water. The possible mechanism for high photocatalytic activity of Sn doped N-TiO<SUB>2</SUB> has also been discussed.</P>
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Effect of leavening agent on structural and photocatalytic properties of ZnO nanorods
Babar, S. B.,Gavade, N. L.,Park, J.,Garadkar, K. M.,Bhuse, V. M. Springer Science + Business Media 2017 Journal of materials science Materials in electron Vol.28 No.12
<P>In the present work, we have demonstrated a simple, facile, one-step, rapid and cost effective synthesis of ZnO nanorods through the thermal decomposition of zinc acetate and leavening agent (NaHCO3). The silver nanoparticles (AgNPs) were deposited on the surface of ZnO nanorods by photocatalytic reduction of Ag (I) to Ag(0). As synthesized ZnO nanorods and Ag-ZnO nanocomposites were characterized by using X-ray Diffraction, field emission scanning electron microscope, high-resolution transmission electron microscope and diffuse reflectance spectroscopy. The photocatalytic activities of the ZnO nanorods and Ag-ZnO nanocomposites were evaluated for the photodegradation of Methyl Orange (MO) under UV and sunlight irradiation. The use of common leavening agent helps to prevent the aggregation of ZnO nanorods, further it hinders crystallite growth and narrowing the diameter of nanorods by the evolution of carbon dioxide during calcination. The ZnO nanorods and Ag-ZnO nanocomposite exhibited an enhanced photocatalytic activity and separation of photogenerated electron and hole pairs. Due to effect of leavening agent and AgNPs deposited on surface of ZnO nanorods finds best catalyst for the 99% degradation of MO within 30 min compared to ZnO.</P>
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Morphological evolution of Cu doped ZnO for enhancement of photocatalytic activity
Kadam, A.N.,Kim, Taek Gon,Shin, Dong Su,Garadkar, K.M.,Park, Jinsub ELSEVIER SCIENCE 2017 Journal of Alloys and Compounds Vol.710 No.-
<P><B>Abstract</B></P> <P>The structure, morphology and chemical doping in metal oxide are important factors that can influence on its photocatalytic activity. In this work, a facile and template free reflux method has been used to synthesize ZnO nanostructures for the morphology control of cubes, maize corn seeds, and rods at low temperature. The photocatalytic activity of ZnO with different morphology was evaluated towards degradation of methyl orange under UV light illumination. Among all the morphology controlled ZnO, the maize corn seed shaped ZnO shows the superior photocatalytic activity. Moreover, the influence of Cu contents on the structural, optical, and photocatalytic activity of ZnO maize corn seed was also investigated systematically. The photocatalytic experiment towards the degradation of methyl orange revealed that the 0.5 mol% Cu doped ZnO exhibits 3.5 fold higher photocatalytic activity than pure corn seed shaped ZnO. The enhancement of photocatalytic activity by Cu ions substituting in ZnO lattices is attributed to synergetic effect of Cu and ZnO, increase the separation of photogenerated electron-hole pairs, oxygen vacancy, decrease in crystallite size and the higher surface to volume ratio. Based on scavengers test, it was found that both superoxide and hydroxyl radicals are mainly actives species involved for the degradation of methyl orange.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ZnO with cube, corn seed and rod like morphology were prepared by a facile reflux method. </LI> <LI> Controlled Cu doping could be achieved at low temperature. </LI> <LI> The substitution of Cu<SUP>2+</SUP> in ZnO corn seed was confirmed by various characterization techniques. </LI> <LI> 0.5 mol% Cu doped ZnO exhibits 3.5 times higher photocatalytic activity than pure ZnO (Z5). </LI> <LI> Based on scavengers test, both superoxide and hydroxyl radicals are mainly actives species. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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