Manganese Loaded on Titania Surface by Impregnation Method for Photocatalytic Degradation of Reactive Red-3 Dye

Abstract:

The aim of this work focused on the preparation of Mn²⁺ doped on TiO₂ by impregnation method for the photocatalytic degradation of Reactive Red-3 dye aqueous solution. Characterizations of the photocatalyst were carried out by using XRD, BET, SEM and UV-DRs. The extended photocatalysis were studied as functions of %wt Mn²⁺ (0%, 0.05%, 0.1%), pollutant concentration, solution pH and catalyst loading using Response Surface Method (RSM) based on Box-Behnken design. Based on results found that the anatase phase was not affected by Mn²⁺ added on the surface of TiO₂ whereas the rutile phase increased with increasing Mn²⁺ contents. The band gap energy of Mn²⁺ doped on TiO₂ did not show in red shift but it exhibited higher absorbance than neat TiO₂ in visible region. The surface area was insignificantly changed for Mn²⁺ doped on TiO₂. The degradation results were investigated that pollutant concentration, pH of solution and loading of Mn²⁺ on TiO₂ were significant parameters effecting on photocatalytic degradation of Reactive Red-3 dye. The existence of Mn²⁺ on TiO₂ decreased the activity of rectaion. The optimum condition was 0%wt of Mn²⁺, 10 ppm of Reactive Red-3, pH 4 and 4.0 g/L of catalyst loading.

• Periodical: Materials Science Forum (Volume 734)
• Pages: 295-305
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.734.295
• Online since: December 2012
• Authors: Kitirote Wantala, Anupap Tosuwan, Nurak Grisdanurak
• Keywords: Box-Behnken, Mn/TiO₂, Reactive Red-3

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