Synthesis, characterization and photocatalytic applications of Zn-doped TiO2 nanoparticles by sol–gel method

Dinkar V Aware,Shridhar S Jadhav

doi:10.1007/s13204-015-0513-8

Abstract

Mesoporous, nanocrystalline, Zinc-doped TiO2 nanoparticles were synthesized by surfactant-assisted sol–gel method. The X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), and UV–VIS spectrometer techniques were used to characterize the synthesized products. XRD results confirm the formation of the anatase phase for the TiO2 nanoparticles, with crystallite sizes in the range of 12.6–18.1 nm. The small crystallite size and doping with Zinc ion inhibit phase transformation and promote the growth of the TiO2 anatase phase. The SEM and TEM micrographs revealed the spherical-like morphology with average diameter of about 12–18 nm which is in agreement with XRD results. The optical study shows that doping ions lead to an increase in the absorption edge wavelength and a decrease in the band gap energy of titania. Photocatalytic activity of the synthesized nanomaterials was successfully tested for photodegradation of methyl red as model pollutant under UV light. The photocatalytic activity results confirm that the doped nanoparticles show higher activity than undoped titania. The small grain size, high crystallinity, high specific surface area and decrease in the band gap energy of doped titania may be responsible for the high photocatalytic activity.

Highlights

Over the past decades, semiconducting photocatalytic materials like ZnO, TiO2 are widely applied for degradation and complete mineralization of toxic organic compounds in water, soil, and air (Zeng et al 2008; Qian et al 2009)
The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs revealed the spherical-like morphology with average diameter of about 12–18 nm which is in agreement with X-ray diffraction (XRD) results
The surface area of the samples was determined from nitrogen adsorption–desorption isotherms at liquid nitrogen temperature using a Quantachrome ASiQwin1994–2013 instrument with out gas 15 min at 150 °C

Summary

Introduction

Over the past decades, semiconducting photocatalytic materials like ZnO, TiO2 are widely applied for degradation and complete mineralization of toxic organic compounds in water, soil, and air (Zeng et al 2008; Qian et al 2009). XRD results confirm the formation of the anatase phase for the TiO2 nanoparticles, with crystallite sizes in the range of 12.6–18.1 nm. Photocatalytic activity of the synthesized nanomaterials was successfully tested for photodegradation of methyl red as model pollutant under UV light.

Results

Conclusion