| Summary: | 碩士 === 國立宜蘭大學 === 環境工程學系碩士班 === 101 === Chemical oxygen demand (COD) is an important index for the detection of organic pollutant in water. Traditional chemical detection method needs to reflux a long time under oxidation (about 2 to 4 hours), and toxic, corrosive chemicals (ex. potassium dichromate, silver sulfate, etc.). It may cause secondary pollution in the environment. In addition, Cl- may interference COD detection. Furthermore, the detection range of COD is very norrow and about 10 ~ 220 mg/L with traditional chemical method. In this study, high ordered titanium dioxide nanotube array films were prepared by anodic oxidation. It can work as electrode for the photoelectrocatalytic system. The titanium dioxide nanoparticles and platinum nanoparticles modified titania nanotube arrays were used to enhance the surface area and active of materials. The series of TiNT-array with Platinum were used to make up a photoelectrocatalytic system. The results of experimental show the suitable measuring range is 0 ~ 500 mg/L. Furthermore, the RSD of ten repetition is under 5 % and the detection limit is 1.04 mg/L. The stability of standard deviation is ± 0.98 mg/L. The unknown sample without Cl- is 500 mg/L, but the COD is only 251 mg/L with traditional chemical detection method. when the COD underestimate about 50 %. The COD is 445 mg/L with the photoelectrocatalytic system. It is more accurate and can not be interfered as Cl-. Therefore, the COD detection system was develop fast, accurate, and no secondary pollution.
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