| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 97 === This study investigates, under microwave assistance, the treatment of chlorobenzene and tetrachloroethylene solutions, chlorinated organic matters, with platinum/rhodium (bimetallic) catalyst as microwave dielectric material. By using cordierite, with its smaller thermal expansion coefficient and good thermal stability, and with its conversion at high-frequency microwave electric field, the dielectric placed within the electric field will create a difference in electric potential due to the absorption of microwave, thus causing the rapid spinning and movements of polarized molecules and ions, the polarized vibration of non-polarized molecules, and heat generation as a result of friction. Part of its energy will be lost after the microwave passes through the dielectric material, instantly increasing the energy within the dielectric material, releasing the stored energy, causing the polarization of molecules and electron vibrations, and further increasing the temperature of the dielectric material.
During the research process, the emphasis is placed on the effectiveness in the use of cordierite as a carrier to utilize microwave as a medium to assist platinum/rhodium (bimetallic) catalyst in the treatment of chlorinated solutions containing chlorobenzene and tetrachloroethylene, for the degradation and combination of microwave energy at constant temperature for the treatment of chlorinated organic waste. The main points of the study include: 1) the investigation of the removal rates using platinum/rhodium (bimetallic) catalyst on chlorinated solutions containing chlorobenzene and tetrachloroethylene, and 2) using the experimental microwave equipment, the Tatung TMO-231 Microwave Oven, to evaluate the viability of the treatment of chlorinated solutions containing chlorobenzene and tetrachloroethylene at the microwave power levels of 150W, 250W, and 350W under a constant temperature of 25℃.
The study result shows that under the constant temperature of 25℃, taking 1g of platinum/rhodium (bimetallic) catalyst to degrade chlorobenzene in water under different temperatures has a removal rate of 12%, while it is 9% for tetrachloroethylene; however, after processing under the microwave power of 150W, 250W and 350W, it was found that the removal rates for chlorobenzene are 68%, 76% and 82%, respectively, while they are 55%, 59% and 68% for tetrachloroethylene, respectively. Under the assistance of microwave, both the removal rates of chlorobenzene and tetrachloroethylene using platinum/rhodium (bimetallic) catalyst are better than without microwave assistance at a microwave power of 250W and a total radiation time of 300s. The result shows that the removal rate was increased 6.6 times with the assistance of microwave for tetrachloroethylene (59% VS 9%), while it was 6.3 times for chlorobenzene (76% VS 12%).
|
|---|
