1. Adsorption kinetic, thermodynamic and desorption studies of C.I. Reactive Black 5 on a novel photoassisted Fenton catalyst
- Author
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Hsueh, Chan-Li, Lu, Yu-Wen, Hung, Chil-Chang, Huang, Yao-Hui, and Chen, Chuh-Yung
- Subjects
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CATALYSTS , *ADSORPTION (Chemistry) , *IRON oxides , *DYES & dyeing , *AZO dyes - Abstract
An activated alumina-supported iron oxide-composite (denoted as FeAA-25) was utilized successfully as a catalyst for the heterogeneous photoassisted Fenton degradation of the azo dye C.I. Reactive Black 5 (RB5) at a pH of 7.0 in our previous study. In this work, the adsorption and desorption behaviours of RB5 on FeAA-25 were studied. Adsorption thermodynamics of RB5 on FeAA-25 were studied at 288, 303 and 318K and the thermodynamic parameters, such as equilibrium constant , standard free energy changes , standard enthalpy change and standard entropy change have been obtained. A pseudo-second-order rate model was employed to describe the kinetic adsorption processes. Additionally, desorption studies revealed that RB5 can be easily removed from FeAA-25 by altering the pH of the solution using NaOH. The mechanism of the RB5 adsorption onto FeAA-25 at neutral pH 7.0 will be established through this study. [Copyright &y& Elsevier]
- Published
- 2007
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