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Adsorption and Desorption of Aqueous Acid Fuchsine on Ferrihydrite |
WU Yongjuan1,2,3, YAN Junying4, ZHANG Qian3, CHEN Rufen4, WEI Yu4, WU Dong1 |
1. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Huihua College, Hebei Normal University, Shijiazhuang 050091, China;4. School of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050086, China |
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Abstract: Acid Fuchsine (AF) was selected as a model anionic dye to examine the adsorption-desorption behavior of ferrihydrite to acid fuchsine by using batch equilibration technique. The useful data is provided for the industrial treatment of acid fuchsine and the similar pollutants. The effect of solution pH and temperature on the adsorption of AF onto FH was investigated in detail. The results indicate that ferrihydrite has an optimum condition for the removal of AF at pH 4.0. The maximum adsorption capacity reaches 392.2mg·g-1 at 297K. Adsorption isotherms of AF at different temperatures are conformed to the Langmuir equation, indicating one monomolecular layer of the coverage on FH surface. The data of Gibbs free energy, enthalpy, and entropy of the adsorption show that the adsorption of AF onto FH is an irreversible, spontaneous, exothermic and chemical process. The AF desorption from FH is also investigated. The isotherms of AF desorption are also conformed to Langmuir equation. The constant values of desorption intensity are much lower than that of adsorption at 297K and 323K with three different concentrations, indicating that AF desorption from FH shows significant hysteretic effect. The hysteretic coefficient decreases with the increase of AF initial adsorbed concentration or temperature. The desorption rates of AF from FH at different initial concentrations or temperatures are below 9%, therefore the adsorption of AF onto FH has the good stability. On the whole, FH is a highly efficient adsorbent for the removal of AF from contaminated water.
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Received: 18 December 2012
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