A solar photoFenton process with calcium peroxide from eggshell and ferrioxalate complexes for the degradation of the commercial herbicide 2,4-D in water

Rocío Girón-Navarro, Verónica Martínez-Miranda, Elia Alejandra Teutli-Sequeira, Ivonne Linares-Hernández, Iván Galileo Martínez-Cienfuegos, Miriam Sánchez-Pozos, Fortunata Santoyo-Tepole

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Abstract

The present study focused on the degradation of the commercial herbicide 2,4-D in water by solar photoFenton assisted with ferrioxalate complex and calcium peroxide (CaO2), using an experimental system consisting of a storage tank, a water pump, a solar reactor, and a compound parabolic concentrator (CPC), which collected solar energy of 212.102 kJ/L. The CaO2 was synthesized from eggshells, the influence of the 2,4-D concentration, oxalic acid (H2C2O4), iron (Fe3+), and CaO2 on the degradation of herbicide was evaluated by HPLC, and the intermediates such as 2,4-dichlorophenol, 1,4-benzoquinone, and oxalic acid were determined to confirm the proposed reaction mechanism. The generation of hydroxyl radicals and other reactive species, depends on the molar ratios of oxalate/Fe3+, CaO2/Fe3+, and CaO2/2,4-D. The optimum concentrations for 100 % degradation were 61.5 mg/L 2,4-D, 50.5 mg/L Fe3+, 100.5 mg/L H2C2O4, and 81 mg/L CaO2 with 42.27 % COD and 44.09 % TOC. This study highlights the viability of the solar photoFenton process to degrade the 2,4-D herbicide and aims to promote: the recovery of organic waste such as eggshells, the complexing effect of H2C2O4-Fe3+, the CaO2 as an alternative oxidant, and the application of renewable energy in the treatment of similar contaminants present in wastewater for future research.

Original languageEnglish
Article number114550
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume438
DOIs
StatePublished - 1 Apr 2023

Keywords

  • Compound parabolic concentrator
  • Degradation
  • Eggshell
  • Hierbamine
  • POA
  • Water treatment

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