Ferrioxalate-assisted solar photo-Fenton degradation of a herbicide at pH conditions close to neutrality

CONTE, L.O.; SCHENONE, A.V.; ALFANO, O.M.

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2016

0944-1344

The solar photo-Fenton degradation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution at a natural pH (pH= 5) using ferrioxalate as ironsource was investigated. The kinetic model proposed and validated in a previouscontribution was used to predict the reactants concentrations during theoxidation process in a nonconcentrating pilot-plant solar reactor. The effectsof hydrogen peroxide to 2,4-D initial concentration ratios (R), temperature, andradiation levels were studied. Furthermore, the spectral UV/visible andbroadband solar radiation fluxes incident on the reactor window were evaluatedby the Simple Model for the Atmospheric Radiative Transfer of Sunshine(SMARTS2) code. The complete destruction of 2,4-D and its main intermediate 2,4-dichlorophenol(2,4-DCP) was achieved in all the experimental runs in only 90 and 120 min ofreaction, respectively. In agreement with these results, a reduction oftoxicity in the system (expressed as % of inhibition of Vibrio fischeri) forlonger times to 90 min of reaction was attained. It is important to emphasizethe good agreement between kinetic model results and experimental dataobtained.