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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>