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標題: | 球狀活性碳對揮發性有機物的吸附與微波再生 Adsorption of Volatile Organic Compounds and Microwave Regeneration on Beaded Activated Carbon |
作者: | Shih-Ying Hsiao 蕭世盈 |
指導教授: | 席行正(Hsing-Cheng Hsi) |
關鍵字: | 揮發性有機物,甲苯,丁酮,球狀活性碳,微波再生, volatile organic compounds,toluene,methyl ethyl ketone,beaded activated carbon,microwave regeneration, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 揮發性有機物(VOC)是重要的空氣汙染物,對環境生態以及人體健康具有短期和長期影響,因此在空氣汙染防制中,如何限制和控制VOC的排放是極為重要的課題。活性碳吸附法一直以來被認為是一種有效的VOC處理方式,除了可以去除低濃度VOC外,也有回收具價值之有機蒸氣的潛力。而球狀活性碳通常具有高機械強度、高比表面積及高度流動性的特性,因此特別適合被應用在流體化床技術中。 本研究使用以酚醛樹酯球為原料,製備出具有高比表面積(大於2000 m2 g-1)、高微孔體積(大於0.9 cm3 g-1)且有高度圓球率之球狀活性碳,並將其應用在處理甲苯(TOL)及丁酮(MEK)吸附去除上;並搭配微波加熱再生技術,在惰性氣體環境中加熱使吸附物脫附,達到活性碳再利用的目標。並比較與商用球狀活性碳在吸附及脫附性能的異同。 吸附試驗之實驗結果以Langmuir、Freundlich及Dubinin-Radushkevich(D-R)等溫吸附曲線模式進行擬合均顯示出高擬合度。而以Clausius-Clapeyron方程式以及由D-R模式所得的參數計算等容吸附熱,表明吸附劑與吸附物的交互作用以物理吸附為主。 而吸附TOL及MEK至飽和之球狀活性碳以微波加熱方式進行再生,結果表現出自製球狀活性碳(SBAC)能在較小微波功率及較短輻照時間下獲得相對商用球狀活性碳(KBAC)高的再生效率。而在循環吸附試驗方面,經過8個循環後,吸附TOL的SBAC吸附容量有顯著的減少,而在吸附MEK方面則些微的提升了吸附效能。然而此現象並沒有顯現在KBAC上,經過多個循環後仍維持恆定吸附容量的特性,顯示其在應用上的高可行性。 Volatile organic compounds (VOCs) are a great threat to the environment and human health. Thus, it is very important to abate the emission of VOCs. Activated carbon has been one of the most prevalently used adsorbents for VOC emission control, and in a beaded shape, the activated carbon has potential to be applied in fluidized bed adsorption. In this study, self-prepared activated carbon beads (SBAC) were synthesized using commercial phenol-formaldehyde resin sphere precursors, which have a very high specific surface area (>2000 m2 g-1) and micropore volume (>0.9 cm3 g-1). These experiments used methyl ethyl ketone (MEK) and toluene (TOL) as adsorbates in fixed-bed adsorption tests, and regenerated them via microwave heating with inert gas purging. All adsorption and desorption experiments were also performed using commercial BAC (KBAC) for comparison. The Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models were used to fit the experimental adsorption data. All three models showed good fitting suitabilities. The isosteric heat of adsorption was calculated using the Clausius-Clapeyron (C-C) equation and the parameters obtained from D-R isotherm indicates that the interactions between adsorbate and adsorbent are due to physisorption. Moreover, microwave heating was applied to the regeneration of saturated adsorbents, in order to analyze the effect of irradiation power and time on the desorption behavior of adsorbate. It was shown that compared to KBAC, SBAC reached relatively higher regeneration efficiencies at lower microwave powers and shorter irradiation times. After eight cycles of regeneration, the adsorption capacity for SBAC was significantly lost when loaded with TOL, whereas in SBAC loaded with MEK it was even greater than the virgin sample. However, KBAC was able to sustain the adsorption capacities after eight cycles of microwave regeneration, proving its hardiness. In conclusion, this study demonstrates the excellent adsorption performance of SBAC and the possibility for microwave regeneration of BACs. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/8199 |
DOI: | 10.6342/NTU202003443 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 環境工程學研究所 |
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