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

• Main Authors: Chih-Shiang Chen, 陳志翔
• Other Authors: Jia-Ming Chern
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/65890923915296544660

碩士 === 大同大學 === 化學工程學系(所) === 99 === 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.