Article

[Kinetics and mechanism of aniline oxidation with chlorine dioxide in water].

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 02/2004; 25(1):95-8. pp.95-8
Source: PubMed

ABSTRACT Reaction kinetics of aniline oxidation with chlorine dioxide in water were investigated systematically by detecting concentrations of aniline with HPLC at regular intervals. Results showed that the reaction was first-order with respect to both chlorine dioxide and aniline, and the entire reaction was of second-order. Under condition of pH 6.86 and water temperature (Tw) 287 K, the second-order reaction rate constant k was 0.11 L x (mol x s)(-1). Reaction activation energy was 73.11 kJ x mol(-1), revealing 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. Effect of chlorite ion on the reaction rate was insignificant. P-aminophenol and azobenzene were detected by GC MS as intermediates. Oxidation pathways were proposed and discussed elementarily.

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Keywords

acidic
 
aniline oxidation
 
chlorine dioxide
 
chlorite ion
 
detecting concentrations
 
entire reaction
 
GC MS
 
intermediates
 
neutral medium
 
Oxidation pathways
 
P-aminophenol
 
Reaction activation energy
 
Reaction kinetics
 
reaction rate
 
reaction rate constants
 
regular intervals
 
second-order reaction rate constant k
 
usual water treatment conditions
 
water temperature