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TiO₂광촉매 운전조건에 따른 MEK의 처리특성

Treatment Characteristics of MEK by Operation Control of TiO₂ Photocatalytic

초록/요약

최근에는 TiO₂광촉매를 이용하여 휘발성유기화합물(VOCs)을 처리하는 광분해 연구가 활발히 개발 되어지고 있다. TTiO₂ 광촉매반응은 TiO₂입자의 에너지 밴드보다 더 높은 에너지가 흡수하면 전자와 홀이 생성되며, 이때 발생된 전자는 분자상태의 산소와 결합하여 환원반응이 일어나며, 홀은 공기중의 물분자나 OH기를 흡수하는 산화반응이 일어난다. 본 연구에서는 휘발성유기화합물 중 MEK를 대상으로, 회분식 반응기와 연속식 반응기를 사용하였으며, 여러 가지 운전조건에 따른 제거효율을 살펴보았다. 코팅방법은 pyrex 판과 유리관에 TiO₂ 용액을 채우고, 일정한 속도로 TiO₂용액을 제거하는 Dip-coating방법을 이용하였다. 실험 결과, 코팅횟수를 3회 실시 했을 때 제거효율이 향상되었으며, 자외선8W에 비해 65W를 사용했을 때 약 40%이상 제거효율 향상을 보였다. 또한, 반응기의 지름이 작을수록 높은 제거효율을 보였다.

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초록/요약

Recent photo catalytic degradation method using TiO₂ photo catalytic is developed for volatile organic compounds(VOCs) treatment. TiO₂ photo catalytic process is initiated from the generation of hole-electron pairs on the semiconductor upon absorbing the ultra-violet light with energy being equal or higher than the band gap energy. Electrons can reduce an electron acceptor such as molecular oxygen and holes can oxidize electron donors including adsorbed hydroxide(OH) or water(H₂O) anion. In the suduy, the target gas compound was methyl ethly ketone(MEK), and examined in a batch scale reactor and a continuous scale reactor at various experimental conditions. A TiO₂ thin film photo catalyst was formed by the dip-coating method after filling a pyrex plate and pyrex tube with the TiO₂solution, it was removed from the reactor at a constant rate. Then it was dried at 120°C for one hour. Result of study, photo catalytic degradation of MEK was improved removal efficiency when TiO₂ photo catalytic coated 3nd times. When increase of UV light intensity(65W), photo catalytic degradation of MEK was improved higher than lower UV light intensity(8W) and it was improved at a small diameter reactor.

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