Publikacje

Abstract:

The degradation of 2,4-dichlorophenol (2,4-DCP) and 2,4-dichlorophenoxyacetic acid (2,4-D)
by ammonium persulfate under various activation conditions was investigated. The effect of
the initial oxidant concentration, pH, temperature, and Fe2+ concentrations were studied.
The rate of 2,4-DCP and 2,4-D oxidation was proportional to the concentration of persulfate.
The optimal pH for 2,4-DCP degradation was 9.0, while for the 2,4-D, it was 3.0. The effect
of temperature on the kinetics of 2,4-DCP and 2,4-D oxidation was examined, and it was
demonstrated that increasing the temperature from 25 to 50°C accelerated the oxidation rate
of both contaminants. The effects of Fe2+ concentrations and the optimal ratio of persulfate
to Fe2+ were studied. Synergistic activation of persulfate by heat and Fe2+ was also
investigated to enhance the oxidation of 2,4-DCP and 2,4-D. Under optimal experimental
conditions, when the persulfate to Fe2+ molar ratio was 1:2 at 50°C, the complete oxidation
of 2,4-DCP and 2,4-D was achieved after about 45 and 60 min. In any case, the 2,4-DCP was
oxidized faster and more efficiently than 2,4-D.

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A comparative study on oxidative degradation of 2,4-dichlorophenol and 2,4-dichlorophenoxyacetic acid by ammonium persulfate