- 學位論文
製備具高除污能力碳球之研究
Preparation of Activated Carbon Sphere with high contaminant Removal Efficiency
摘要
傳統活性碳多為微孔等級，對於較大分子汙染物(如染劑)之去除具一定的限制與難度，因此本研究以三步驟方式，製備具較大孔洞之活性碳，以提升其對於大分子汙染物之去除能力。 經吸附測試後得知，利用三步驟並以3:1為混合K2CO3比例之活性碳，對於MG5及AR1染劑具有最佳吸附能力，對於MG5在10oC、30oC及50oC時，吸附量可達755.74 mg/g、760.34 mg/g 及1334.23 mg/g，而對於AR1在10oC、30oC及50oC時，吸附量則分別為340.17 mg/g、476.49 mg/g 及 552.8 mg/g；對於酚之吸附，二步驟並以3:1為混合K2CO3比例之活性碳具最佳吸附量，在10oC、30oC及50oC時，分別為506.48 mg/g、466.18 mg/g 及 391.1mg/g。由動力學可知，因反應機制的差異，各活性碳對於酚之吸附速率遠高於染劑。由熱力學之分析，本研究製備之活性碳，對於MG5及AR1之吸附為吸熱反應，對於酚之吸附則為放熱反應。由SEM及FTIR之結果分析，利用三步驟製備出之碳球，其球狀型態不會因製程中的高溫而有所改變，且其表面含較多官能基。由BET之檢測結果可知，利用三步驟所製備出之活性碳具有較大之孔洞，且其比表面積亦可維持1000 m2/g以上。
並列摘要
Traditional activated carbon consists predominantly of micropores. This property inhibits the removal of macromolecular contaminants. Therefore, to facilitate the removal of these contaminants, we prepared activated carbon with relatively larger pores using a new approach comprising three steps. The adsorption test results indicated that the activated carbon prepared using three steps (K2CO3 to carbon ratio = 3:1) most effectively removed MG5 and AR1. At 10, 30, and 50 C, the respective adsorption capacity for MG5 was 755.74, 760.34, and 1334.23 mg/g; that for AR1 was 340.17, 476.49, and 552.8 mg/g. However, the traditional activated carbon (i.e., prepared using two steps) (K2CO3 to carbon ratio = 3:1) most effectively removed phenol; the adsorption capacity was 506.48, 466.18, 391.1 mg/g at 10, 30, and 50 C, respectively. From kinetics analysis, the adsorption rate of phenol was faster than that of either MG5 or AR1. According to thermodynamics, the adsorption of MG5 or AR1 was endothermic, and that of phenol was exothermic. The results of SEM and FTIR illustrated that the spherical shape of the activated carbon prepared using three steps was not affected by the high temperature during the preparation process, and its surface contained more functional groups. The BET analysis showed that the activated carbon prepared using three steps exhibited larger pores, but its specific surface area was maintained at more than 1000 m2/g.