3 years ago

Photocatalytic degradation of methylene blue dye by nonconventional synthesized SnO2 nanoparticles

Sai Kumar Tammina, Badal Kumar Mandal, Nalinee Kanth Kadiyala

Publication date: December 2018

Source: Environmental Nanotechnology, Monitoring & Management, Volume 10

Author(s): Sai Kumar Tammina, Badal Kumar Mandal, Nalinee Kanth Kadiyala

Abstract

Three different size tetragonal tin oxide nanoparticles (SnO2 NPs) were synthesized using ascorbic acid as a complexing agent at three different temperatures 170, 500 and 900 °C for 1 h. The synthesized NPs were characterized by using X-ray diffraction (XRD), Transmission Electron Microscope (TEM), Fourier Transform Infrared Spectrophotometer (FT-IR). The optical properties of the synthesized NPs were measured with UV–vis-NIR and fluorescence spectrophotometer. The photocatalytic activity of SnO2 NPs against methylene blue (MB) dye degradation were evaluated with three different size NPs S1, S2 and S3 (3, 11 ± 3 and 27 ± 11 nm) respectively under a multilamp (125 W Hg lamps) photoreactor with UV irradiation towards MB degradation. Smaller size NPs exhibited higher degradation rate within shorter period of time (30 min) than large size NPs (85 min.). Also, photoluminescence (PL) studies under illumination showed that most of the emission energies were within the band gap of SnO2 NPs suggesting Sn interstitials or crystal defects or oxygen vacancy related defects. The present study suggested that the synthesized NPs could be potential photocatalysts against degradation of industrial effluents enriched with different dyes.

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