Synthesis of anatase nanopowders by sol-gel method and influence of temperatures of calcination to their photocatalitic properties

A Golubovic,D Mijin,A Matkovic,M Scepanovic,B Simovic,M Grujic-Brojcin,B Babic

doi:10.2298/sos1501041g

Abstract

The titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor, varying the temperature ?f calcination (from 500 to 550?C with the step of 10 ?C). XRPD results have shown that all synthesized nanopowders are dominantly in anatase phase. The analysis of the shift and linewidth of the most intensive anatase Eg Raman mode confirmed the XRPD results and added the presence of small amount of highly disordered brookite phase in all samples. The analysis of pore structure from nitrogen sorption experimental data described all samples as mesoporous, with mean pore diameters in the range of 1.5 and 4.5 nm. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the textile dye (C.I. Reactive Orange 16). The sample calcined at temperature of 510?C showed the best photocatalytic performance.

Highlights

Permanent environmental pollution from industrial wastewater is of major concern
The titanium dioxide (TiO2) nanopowders were produced by sol-gel technique from tetrabutyl titanate as a precursor, varying the temperature оf calcination
The crystal size of the TiO2 nanopowders were calculated by Scherrer and Williamson-Hall methods and these values are presented in Tab

Summary

Introduction

Permanent environmental pollution from industrial wastewater is of major concern. Many industries use dyes in order to colour their products and consume substantial volumes of water. Semiconductor photocatalysis is a very popular technology that has a lot of applications in environmental systems such as air purification, water disinfection, hazardous waste remediation, and water purification [1]. Several semiconductors have band gap energies sufficient for promoting or catalyzing a wide range of chemical reactions important for environmental. TiO2 has chosen to be the most suiTab. for widespread environmental applications because of its biological and chemical inertness, stability against photocorrosion and chemical corrosion, and cost-effectiveness [2]. TiO2 is the very important constituent of composite ceramic materials (binary, as Al2O3TiO2 and TiO2-Y2O3 or ternary, as Al2O3–TiO2–Y2O3) [3], and getting acquainted with

Methods

Results

Conclusion