금속물질로 개질된 광촉매를 이용한 톨루엔 광분해특성 연구

국문 초록 (Abstract)

광촉매 반응에서 TiO₂에 금속물질을 첨가하면 촉매표면이 변화되며, 이러한 금속물질은 광분해반응의 속도를 증가시 킨다. 본 연구에서는 TiO₂ 광촉매의 광분해능력을 향상시키기 위해 다양한 방법을 이용하여 개질하였으며, 개질된 광촉매의 광분해특성은 회분식 광반응기를 이용하여 조사하였다. 우수한 TiO₂ 광촉매용액을 얻기 위해 여러 종류의 분산제와 안정제 를 조사하였으며, 분산제로는 isoproply alcohol, 안정제로는 sodium silicate가 적합하였다. 톨루엔 분해반응을 향상시키기 위해 다양한 금속물질을 TiO₂ 광촉매에 첨가하여 광분해효율을 조사한 결과 Pd가 가장 우수하였으며, Cu와 W도 우수하였 다. Pd를 첨가한 경우 25%의 제거효율 향상이 있었다. 그러나 Fe의 경우 광촉매분해반응을 상당히 저해하는 것으로 나타났 다. Pd/TiO₂ 광촉매에 Cu 또는 W를 부가적으로 첨가하여도 촉매의 광분해효율에는 증가가 없었다.

다국어 초록 (Multilingual Abstract)

In photocatalysis, the addition of metal matter to TiO₂ can alter the surface properties. As such, the metal can increase the rate of the photodegradation reaction. In this study, a range of modified TiO₂ photocatalysts were prepared and tested to improve the activity of photodegradation at a batch-typed photoreactor. To obtain a good sol solution of the TiO₂ photocatalyst, several types of dispersion agents and stabilizers were investigated. The photocatalyst solutions were modified with isoproply alcohol as the dispersion agent and sodium silicate as the stabilizer. The effects of various metallic elements on enhancing the photocatalytic activity of TiO₂ on the degradation of toluene were examined. Palladium-added TiO₂ was found to be the best, whereas copper or tungsten-added also showed good results. In the case of palladium addition, the increase in removal efficiency was 25%. On the other hand, Fe-added TiO₂ showed a notable decrease in photocatalytic degradation. Additional doping of copper or tungsten on the Pd/TiO₂ had no positive effect on the photodegradation activity.

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