Kinetics of aniline oxidation with chlorine dioxide

Article type: Research Article

Authors: FAN, Zhi-yun | HUANG, Jun-li | WANG, Peng | SU, Li-qiang | ZHENG, Yong-jie | LI, Ying-jie

Affiliations: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | Analysis Center, School of Chemistry and Chemistry Engineering, Qiqihar University, Qiqihar 161006, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: For the first time, kinetics of aniline oxidation with chlorine dioxide (ClO_2) were investigated systematically by detecting concentration of aniline with HPLC at regular intervals. Results showed that the reaction was first-order both in ClO_2 and in aniline, and the oxidation reaction could be described as second-order reaction. Stoichiometric factor η was experimentally determined to be 2.44. The second-order-reaction rate constant k was 0.11 L (mol ˙ s) under condition of pH 6.86 and water temperature (T_w) 287K. Reaction activation energy was 72.31 kJ/mol, indicating that the reaction could take place under usual water treatment conditions. The reaction rate constants in acidic and alkali media were greater than that in neutral medium. Chlorite ion could slightly in crease reaction rate in acidic medium. p-aminophenol and azobenzene were detected by GC-MS as intermediates.

Keywords: chlorine dioxide, aniline, kinetics

Journal: Journal of Environmental Sciences, vol. 16, no. 2, pp. 238-241, 2004