酸鹼值與溫度對苯甲酸在活性碳上吸附之影響

EFFECTS OF PH AND TEMPERATURE ON BENZOIC ACID ADSORPTION ONTO ACTIVATED CARBON

陳志翔(Chih-Shiang Chen)

指導教授 ： 陳嘉明

大同大學/工程學院/化學工程學系所/碩士(2011年)

摘要

苯甲酸被廣範使用在許多工業上，因此產生含苯甲酸的廢水，因為苯甲酸會危害水環境，故含苯甲酸的廢水需被處理。活性碳吸附可有效地移除廢水的苯甲酸，但其效率會受到苯甲酸濃度、pH值與溫度的影響。本研究量測初始苯甲酸濃度、初始pH值對吸附動力學的影響，擬一階動力學模式與擬一階動力學模式都能吻合在不同初始苯甲酸濃度、初始pH值下的動力曲線。本研究也探討溫度對等溫吸附的影響，結果顯示Freundlich吸附模式比Langmuir吸附模式更吻合吸附平衡數據。根據本研究，在低溫、低濃度的酸性溶液中，活性碳對苯甲酸的吸附效果最好。

關鍵字

動力學 ； 活性碳 ； 吸附 ； 苯甲酸

並列摘要

Benzoic acid is widely used in many industries that result in wastewaters containing benzoic acid. Due to its harmful effects to aquatic environment, wastewaters containing benzoic acid need to be treated. The efficiency of activated carbon adsorption, an effective method to remove benzoic acid from wastewaters, depends on the benzoic acid concentration, solution pH, and temperature. In this study, the effects of initial benzoic acid concentration and initial pH on the carbon adsorption kinetics were experimentally measured. The pseudo-first-order model and pseudo-second-order model were found to fit the adsorption kinetic data at varying initial benzoic acid concentrations and at different initial pHs. The effect of solution temperature on the benzoic acid adsorption isotherm was also studied. Freundlich isotherm model was found to fit the isotherm data at different temperatures better than the Langmuir model. From the results of this study, activated carbon is more efficient to adsorb benzoic acid in acidic, dilute solution at low temperature.

並列關鍵字

Actived Carbon ； Adsorption ； Benzoic acid ； Kinetics

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