Scientific Results

Oxidative decomposition of atrazine in water in the presence of hydrogen peroxide using an innovative microwave photochemical reactor

Year: 2011

Authors: Chen H., Bramanti E., Longo I., Onor M., Ferrari C.

Autors Affiliation: Department of Environmental Engineering, Civil & Environment Engineering School, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China;
Italian National Research Council-Istituto di Chimica dei Composti Organometallici (ICCOM), Via G. Moruzzi 1, 56124 Pisa, Italy;
Italian National Research Council-National Institute of Optics (INO), Via G. Moruzzi 1, 56124 Pisa, Italy

Abstract: The simultaneous application of microwave (MW) power and UV light leads to improved results in photochemical
processes. This study investigates the oxidative decomposition of atrazine in water using
an innovative MW and UV photochemical reactor, which activates a chemical reaction with MW and
UV radiation using an immersed source without the need for a MW oven. We investigated the influence
of reaction parameters such as initial H2O2 concentrations, reaction temperatures and applied
MW power and identified the optimal conditions for the oxidative decomposition of atrazine. Atrazine
was completely degraded by MW/UV/H2O2 in a very short time (i.e. t1/2 = 1.1 min for 20.8 mg/L in
optimal conditions). From the kinetic study, the disappearance rate of atrazine can be expressed as
dX/dt = kPH[M]0(b−X)(1−X), where b [H2O2]0/[M]0 + kOH[•OH]/kPH[M]0, and X is the atrazine conversion,
which correlates well with the experimental data. The kinetic analysis also showed that an indirect
reaction of atrazine with an OH radical is dominant at low concentrations of H2O2 and a direct reaction
of atrazine with H2O2 is dominant when the concentration of H2O2 is more than 200 mg/L.


Volume: 186 (2/3)      Pages from: 1808  to: 1815

More Information: Huilun Chen would like to acknowledge financial support from the Chinese Scholarship Council (CSC).
KeyWords: Atrazine; Decomposition; MW/UV/H(2)O(2); Kinetics;
DOI: 10.1016/j.jhazmat.2010.12.065

Citations: 32
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