Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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INVITED REVIEW ARTICLE : Studies on TiO₂Photocatalytic Reactions

초청총설논문 : TIO₂광촉매 반응 연구

Choe, Won Yong
최원용

  • Published : 20030000
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Abstract

반도체 광촉매는 태양에너지 전환, 환경오염물질 분해, 초친수성 및 자정기능 소재 등으로 최근 활발히 연구되고 있는 분야이다. 광촉매 연구는 기초 및 응용과학 분야에 걸쳐 매우 다양한 관점에서 진행되고 있으며 관련 연구자들의 학문적 배경도 매우 다양한 학제적 성격을 띠고 있다. 본 총설에서는 광촉매로 가장 널리 사용되고 있는 TiO₂의 특성에 대하여 개관하고, 이를 이용하여 본 연구실에서 수행한 여러가지 난분해성 오염물질들의 광촉매 분해반응 연구 사례들을 소개한다. 기술된 광촉매 분해반응은 액체/TiO₂, 기체/TiO₂, 고체/TiO₂ 계면 시스템을 모두 포함하며 대상 물질들은 다이옥신, 유기염소화합물, 암모니아, 비소이온, 일산화탄소, 검댕, 고분자 필름 등 이다. 광촉매 상에서의 오염물질 분해반응은 대부분의 경우 표면에서 생성된 OH 라디칼의 강력한 산화력에 기인하나, 전체적인 메커니즘은 OH 라디칼 뿐만 아니라 공유대 정공, 전도대 전자, O₂, superoxides (O₂-, HO₂)등이 관련되는 일련의 산화환원 표면반응이 복잡하게 연계되어 일어난다. 광촉매 분해반응 메커니즘은 대상물질에 따라 매우 다양한 양상을 보이며 일반화시키기 매우 어렵다. 또한, TiO₂광촉매에 가시광 활성을 부여하기 위하여 제조된 ruthenium complex-sensitized TiO2의 특성과 가시광 반응 활성, 표면에서의 광여기 전자전이 반응을 증대시키기 위해 제조된 surface platinized TiO₂(Pt/TiO₂)의 특성과 몇 가지 광촉매 반응 시스템들에서의 메카니즘과의 관련성 등을 논한다.

Keywords

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