Journal Articles ChemCatChem Year : 2025

Improved Degradation of Phenanthrene in Soil Washing Eluent by Photo-Fenton Like Process with Citric Acid

Abstract

Herein, improved degradation of phenanthrene (PHE), one of the common polycyclic aromatic hydrocarbons (PAHs), was explored in a citric acid (CA) photo-Fenton like system under UVB irradiation. Degradation of PHE in soil washing (SW) eluent by the nonionic surfactant Tween 80 (TW80) using Fe(III)-CA complex was compared with other iron complexes showing a faster degradation with a rate constant of 3.07 × 10−2 min−1. The stability as well as photochemical transformation of Fe(III)-CA under UVB radiation was evaluated, followed by comparison of PHE oxidation with traditional Fenton or Fenton like process. Fe(III)-CA complex was found to be stable in dark but quickly photo dissociated under irradiation. The system using Fe(III)-CA was proved oxidizing PHE more efficiently than traditional Fenton reaction with a rate constant of 3.92 × 10−3 min−1 and Fe(II)-CA involved system with a rate constant of 1.74 × 10−2 min−1. A two-stage pattern of PHE decay was observed in the UVB/H2O2/Fe(III)-CA system. The effects of operational factors including Fe(III)-CA dosage, Fe(III)/CA ratio, H2O2 and TW80 dosage on PHE degradation were explored. The checked parameters exhibited different influence on PHE degradation. This work provided a cost-effective strategy for remediating soil pollutants in SW effluent with the presence of surfactant.

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Dates and versions

hal-04941024 , version 1 (14-02-2025)

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Yufang Tao, Marcello Brigante, Shenshen Sun, Hui Zhang, Gilles Mailhot. Improved Degradation of Phenanthrene in Soil Washing Eluent by Photo-Fenton Like Process with Citric Acid. ChemCatChem, 2025, ⟨10.1002/cctc.202401520⟩. ⟨hal-04941024⟩
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