Photo-activation of persulfate and hydrogen peroxide by humic acid coated magnetic particles for Bisphenol A degradation

Nuno P.F Gonçalves (1) , Marco Minella (1) , Gilles Mailhot (2) , Marcello Brigante (2) , Alessandra Bianco Prevot (1)

1 UNITO - Università degli studi di Torino = University of Turin
2 ICCF - Institut de Chimie de Clermont-Ferrand

Magnetic particles (MPs) coated with humic acid (HA) prepared under anoxic atmosphere were tested as heterogeneous photo-Fenton catalyst for the activation of hydrogen peroxide (H 2 O 2) and persulfate (S 2 O 8 2−) using Bisphenol A (BPA) as a model pollutant. The role of HA coating, pH value and H 2 O 2 /S 2 O 8 2− concentration were investigated. A positive contribution of HA coating on H 2 O 2 and S 2 O 8 2− activation was found. The highest BPA degradation rates were achieved at acidic conditions (pH 3) with both H 2 O 2 and S 2 O 8 2− , however persulfate showed a significant efficiency even at pH 6, interesting feature in the light of decreasing the wastewater treatment costs. By the addition of selective quenching agents, % OH and SO 4 %-were identified as the main reactive species involved in the BPA abatement. An important contribution of the S 2 O 8 2− photolysis on the overall BPA transformation was highlighted. The reuse of the catalyst was investigated and similar efficiency using H 2 O 2 and S 2 O 8 2− activation was observed until the third catalytic cycle. Experiments carried out using real wastewater samples, showed a good, even if less efficient compared to pure water, BPA removal.

Domaines: Chimie

Nuno P.F Gonçalves, Marco Minella, Gilles Mailhot, Marcello Brigante, Alessandra Bianco Prevot. Photo-activation of persulfate and hydrogen peroxide by humic acid coated magnetic particles for Bisphenol A degradation. Catalysis Today, 2021, 361, pp.43-49. ⟨10.1016/j.cattod.2019.12.028⟩. ⟨hal-02470307⟩