| Summary: | 碩士 === 逢甲大學 === 環境工程與科學學系 === 105 === In order to effectively improve the recycling benefits of electronic waste, this study attempts to reuse the waste of printed circuit board (PCB) plant for the synthesis of catalyst to be used in air pollution control. The experiments divided into two sections. In the first section, the waste liquids of PCB were reused to synthesize the catalysts with different preparation conditions. The catalytic activities and properties of the catalysts were measured and analyzed. In the second section, the solid waste PCBs were used to synthesize the catalysts with the best preparation conditions obtained in the first section. The catalytic activities and properties of the catalysts were also measured and analyzed.
The results of first section experiments show that the major metal in the waste liquid of recycled PCB was copper and the content was 12500 ppm, which implied the synthesis of copper catalyst from the recycled PCB liquids by using the impregnation method was feasible. The catalytic activities of synthesized copper catalysts on NO and propylene gas were very good. The conversion efficiency of propylene by the Cu/AC granular catalysts can be up to 93%, and the conversion efficiency of NO can be up to 85.7%. The optimum preparation conditions for the waste liquids of PCB were using activated carbon as the support, impregnated at 85 °C for 12 hours, and finally be calcined at 300 °C for 4 hours. The influence of different control factors on the catalytic activity of propylene followed the sequence of impregnation temperature, impregnation time, and the calcination temperature. The influence of different control factors on the catalytic activity of NO followed the sequence of calcination temperature, impregnation time, and finally the impregnation temperature. The results of second section experiments show that the best recovery efficiency of copper in the PCB board was occurred when the dissolving reagent was aqua regia and microwave digestion method was used. The catalysts were synthesized by the initial wet impregnation method and the copper content in the granular catalysts can be improved. When the reaction temperature was 300℃, the conversion efficiency of propylene by the Cu/AC granular catalysts can be up to 95.1%, and the conversion efficiency of NO can reach 86.9%. All the results indicated that the waste PCB liquids and solids were feasible for the synthesis of catalysts and the catalysts had good application performance and expansion capacity. The values of recycled products from the waste PCB and the benefits of waste recycling can be effectively improved.
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