Kinetic Studies of n -Butylparaben Degradation in H 2 O 2 /UV System

Author： Błędzka Dorota   Miller Jacek S.   Ledakowicz Stanisław  

Publisher： Taylor & Francis Ltd

ISSN： 0191-9512

Source： Ozone: Science and Engineering, Vol.34, Iss.5, 2012-09, pp. : 354-358

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Abstract

This work reports the experimental results of kinetics study of n-butylparaben (BP) degradation in H2O2/UV systems. A pseudo–steady-state and competition kinetic approaches were used to determine the reaction rate constants between the BP and •OH. In competition kinetics atrazine (2.30 × 109 M−1s−1) was used as a reference compound. The measured rate constants for •OH reaction with BP ranged from (3.84 ± 0.12) × 109 M−1s−1 to (8.56 ± 0.90) × 109 M−1s−1 depending on solution pH and temperature. Values of the rate constant obtained using different methods were in good agreement. The calculated activation energy was equal to 19.01 ± 1.02 kJ mol−1.

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