在人口快速增長與世界資源的耗盡下，許多國家已致力在資源循環與永續發展等政策實施上，污染的處理與廢棄物的再利用將是長遠的發展趨勢。活性碳吸附即是常見的污染處理技術，但當使用時間增長，活性碳失去吸附效力形成廢棄物，因此廢活性碳的回收再利用即是一個值得發展的技術。在台灣，半導體產業貢獻了經濟發展，也帶來了環境衝擊，而異丙醇即是常見的污染物。本研究中，探討不同批次操作條件下，活性碳吸附與脫附異丙醇之行為模式。
在吸附的部分，Langmuir等溫吸附模式較符合本研究結果，研判異丙醇傾向單層吸附在活性碳上。當固液比為5 g/L，異丙醇初始濃度為1,000 mg/L時，可得到相對高之吸附量(41.3 mg/g)。溶液pH值對於異丙醇吸附在活性碳上僅有些微影響，係因異丙醇有高的pKa值(16.5)，故異丙醇多以分子呈現在水溶液中，因此溶液pH只能影響活性碳表面電荷。活性碳顆粒大小的實驗結果顯示，僅大顆粒(約2.19 mm)的活性碳有較低之吸附量(36.3 mg/g)。在吸附動力分析的部分，擬二階模式與雙指數模式皆符合實驗數據，研判異丙醇吸附在活性碳上，是雙位子吸附或雙步驟質傳控制，亦可能兩者同時發生。在脫附的部分，相較電解與溶液pH值的影響，提高反應溫度可大幅的提升再生效率至78%，此外，在多次吸脫附實驗結果顯示，第四次的再生效率略為下降(67.7%)。

Activated carbon has been widely used in the treatment of wastewater owing to the unique surface properties. As the adsorption capacity has been depleted, activated carbon may be buried in a landfill, incinerated or regenerated. Regeneration offers clear advantages such as a lower consumption of activated carbon. Isopropyl alcohol (IPA) is one of the major contaminants in semiconductor industry, which have played a key role in Taiwan’s economic development. In this study, adsorption and desorption of IPA over activated carbon in an aqueous solution under various operating conditions were investigated with a batch reactor.
In adsorption, experimental results were better fitted with Langmuir adsorption isotherm model, suggesting that IPA could form monolayer coverage on the activated carbon surface. With an initial IPA concentration of 1,000 mg/L, the maximum adsorption capacity was 41.3 mg/g at a solid to liquid ratio of 5 g/L. IPA adsorption slightly depends on solution pH, which maximum adsorption capacity occurred at pHpzc. The effect of particle size implies that merely the larger particle size (about 2.19 mm) activated carbon could affect the adsorption capacity. Kinetic study indicated that the adsorption of IPA is better described by pseudo second order model and double exponential model, which suggested that there are two different mechanisms, which two-site adsorption and two-step diffusion controlled could occur simultaneously. In desorption, a regeneration efficiency around 78% was found with a reaction temperature of 65°C. The regeneration efficiencies over four cycles of desorption operation were 67.7%.

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