포름알데히드의 광분해 반응은 $TiO_2$의 딥핑코팅방법에 의해 실험을 실시하였다. 광촉매 필름 두께는 코팅수가 증가할수록 증가하며 그것은 포름알데히드의 광분해 정도를 결정하였다. 광촉매의 5겹코팅에 의한 포름알데히드의 제거효율이 1겹코팅의 경우에 비하여 포름알데히드 제거효율은 54% 이상 증가되었으며 코팅겹별로 다른 실험조건들이 결정되었다. 광촉매의 두께에 의한 광분해 반응은 포름알데히드 초기농도에 따라 다르게 나타나며 초기농도가 4 mg/L인 경우에 광촉매양이 $32.6 mg/cm^2$인 경우에 UV광원세기가 30와트, 35cm 거리에서 포름알데히드 제거효율이 좋은 결과를 얻었다.
The photodegradation of formaldehyde was performed using immobilized $TiO_2$ by dipping technique. The thickness of a $TiO_2$ film immobilized was proprotionally increased with the number of coating and it determined the degree of formaldehyde degradation. The removal rate of formaldehyde with UV radiation in the presence of five coating layer was enhanced by 54% than that of one coating layer. Several experiments were performed to search for the optimal conditions. From the further study, it is believed that the activity of $TiO_3$ catalyst depended upon initial concentration of formaldehyde. When the initial concentration of formaldehyde was 4mg/L in $32.6mg/cm^2;of; TiO_2$ coated photocatalytic reactor, the removal efficiencies enhanced under UV intensity of 30 Watt with 35cm distance of UV light source.
