순환식 반응기에서 TiO2 광촉매를 이용한 Chromium(VI)의 제거에 미치는 영향인자에 대한 연구

A Study on the Factors Affecting Removal of Chromium(VI) Using TiO2 Photocatalyst in a Circular Type Reactor

This study was carried out the removal of Cr(VI) which was known to the toxic pollutant in industry using the process of UV and TiO2 photocatalyst in a circular type reactor. In this experiment, the series of photocatalytic process for the removal of Cr(VI) has been selected as a model reaction in a circular type reactor in order to obtain the basic data on the influence of various experimental parameters such as circulation flow rate, pH of solution, initial Cr(VI) light illumination and TiO2 dosage, and salicylic acid concentration. The results of this study were as follows; 1. With both UV light illumination and TiO2 present, Cr(VI) was more effectively eliminated than with either UV or TiO2 alone. 2. As the circulation flow rate of solution increased, the removal efficiency of Cr(VI) was increased. However, over 2.4 l/min of circulation flow rate, the efficiency wa limited. 3. A increase in the photocatalytic removal of Cr(VI) was noticed with decreasing pH. 4. An increase in the photocatalytic removal of Cr(VI) was noticed with decreasing Initial Cr(VI) concentration and first order kinetics was observed from the result at different initial concentration of Cr(VI). 5. Photocatalytic removal efficiency of Cr(VI) increased with increasing TiO2 dosage. However, over 1.0 g/l of TiO2 dosage, the efficiency reached a plateau. 6. As low concentration of saliculic acid were added, there was an increase in the removal efficiency of Cr(VI). However, over 300 mg/l of salicylic acid, the efficiecy was decreased. It eas found that application of photocatalysis to water treatment that contains both Cr(VI) and salicylic acid was possible.