Photocatalytic Activity of Titanium Dioxide Powder Fabricated from an Anodized Titanium Sheet under Ultra-Violet and Visible Light Irradiation

Michio Kaneko,Kazuo Yamagishi,Kiyonori Tokuno,Takao Wada,Tsuyoshi Hasegawa

doi:10.4236/jsemat.2017.71002

Michio Kaneko, Kazuo Yamagishi + Show 3 more

Open Access

https://doi.org/10.4236/jsemat.2017.71002

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Abstract

A commercially pure titanium sheet with titanium carbide (TiC) precipitated in its surface layer was anodized in NH4NO3 aqueous solution and heat treated in air. The photocatalytic activity of titanium dioxide powder collected from the surface of the anodized titanium sheet was evaluated under ultra-violet and visible light irradiation. It showed relatively high photocatalytic activity in 0.1 mol/l potassium iodide solution, which was almost equal to the activity level of TiO2 powder (P-25) manufactured by Degussa Corporation. The better photocatalytic activity under ultra-violet irradiation is considered to be related to the formation of anatase type titanium dioxide. Photocatalytic activity under visible light irradiation was also observed, which was considered to be attributable to impurity doping, (carbon), in the titanium dioxide powder.

Highlights

Since Honda and Fujishima discovered the electrolysis of water by titanium dioxide under irradiation [1], the interest in titanium dioxide has been widened to environmental purification [2] [3] antibacterial [4] [5] and other uses
A commercially pure titanium sheet with titanium carbide (TiC) precipitated in its surface layer was anodized in NH4NO3 aqueous solution and heat treated in air
Photocatalytic activity under visible light irradiation was observed, which was considered to be attributable to impurity doping, in the titanium dioxide powder

Summary

Introduction

Since Honda and Fujishima discovered the electrolysis of water by titanium dioxide under irradiation [1], the interest in titanium dioxide has been widened to environmental purification [2] [3] antibacterial [4] [5] and other uses. Various methods for fabricating titanium dioxide with high photocatalytic activity have. M. Kaneko et al 14 been investigated. Anodic oxidation is one of the methods to produce titanium dioxides on titanium substrate and is commercially used to produce colored titanium materials. The color of the anodized titanium substrate can be changed by varying the thickness of surface titanium oxide layer. Colored titanium sheets are mainly used as architectural materials

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