유성 볼밀을 통해 제조된 TiO2-xNx 광촉매의 가시광 활성도와 NH3양 및 분쇄시간과의 상관 관계
The Relation Between a Visible-light Photocatalytic Activity of TiO2-xNx and NH3 Amount/the Period of Grinding Time
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A visible-light photoactive TiO2-xNx photocatalyst was synthesized successfully by means of cogrinding of anatase-TiO2(a-TiO2) in NH3 ambient, followed by heat-treatment at 200℃ in air environment. In general, it is well known that the grinding-operation induces phase transformation of a-TiO2 to rutile TiO2. This study investigates the influence of the amount of NH3 gas on the phase transformation rate of a-TiO2 and enhancement of visible-light photocatalytic activity, and also examines the relation between the photocatalytic activity and the period of grinding time. The phase transformation rate of a-TiO2 to rutile is retarded with the amount of NH3 injected. And the visible-light photocatalytic activity of samples, was more closely related to the period of grinding time than NH3 amount injected, which means that the doping amount of nitrogen into TiO2 more effective to mechanical energy than NH3 amount injected. XRD, XPS, FT-IR, UV-vis, Specific surface area (SSA), NOx decomposition techniques are employed to verify above results more clearly.
Abstract
A visible-light photoactive TiO2-xNx photocatalyst was synthesized successfully by means of cogrinding of anatase-TiO2(a-TiO2) in NH3 ambient, followed by heat-treatment at 200℃ in air environment. In general, it is well known that the grinding-operation induces phase transformation of a-TiO2 to rutile TiO2. This study investigates the influence of the amount of NH3 gas on the phase transformation rate of a-TiO2 and enhancement of visible-light photocatalytic activity, and also examines the relation between the photocatalytic activity and the period of grinding time. The phase transformation rate of a-TiO2 to rutile is retarded with the amount of NH3 injected. And the visible-light photocatalytic activity of samples, was more closely related to the period of grinding time than NH3 amount injected, which means that the doping amount of nitrogen into TiO2 more effective to mechanical energy than NH3 amount injected. XRD, XPS, FT-IR, UV-vis, Specific surface area (SSA), NOx decomposition techniques are employed to verify above results more clearly.
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