4.7 Article

Synergistic improving photo-Fenton and photo-catalytic degradation of carbamazepine over FeS2/Fe2O3/organic acid with H2O2 in-situ generation

Journal

CHEMOSPHERE
Volume 307, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.136199

Keywords

Carbamazepine; FeS2/Fe2O3; Organic acids; Photocatalysis; Heterogeneous photo-Fenton

Funding

  1. National Natural Science Foundation of China [42067057]
  2. Basis Research Project of Yunnan China [202101AT070087]
  3. High-level Scientific Research Foundation for Talent Introduction of Kunming University of Science and Technology [10978172]

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In this study, a heterogeneous photo-Fenton and photo-catalytic system was constructed using oxide pyrite (FeS2/Fe2O3) mineral and organic acids. The system enhanced the degradation efficiency of carbamazepine (CBZ) through the synergistic photo-Fenton and photo-catalytic reaction. This investigation provides an innovative strategy for the removal of organic pollutants using natural minerals.
Herein, a heterogeneous photo-Fenton and photo-catalytic system was constructed using oxide pyrite (FeS2/Fe2O3) mineral and organic acids including tartaric acid (TA), ascorbic acid (AA), and citric acid (CA). In the proposed system, FeS2/Fe2O3 can be successfully activated through irradiation to generate photogenerated carriers, which generated H2O2 in-situ through the reduction reactions between e- and O-2. The addition of organic acids enhanced the dissolution of iron from FeS2/Fe2O3. Based on the iron and in-situ generated H2O2, center dot OH was produced through a photo-Fenton reaction. Furthermore, h(+), e(-), and center dot O-2(-), which were generated through the photo-catalytic activation of FeS2/Fe2O3, also played a certain role in the degradation of carbamazepine (CBZ). Therefore, the synergistic photo-Fenton and photo-catalytic reaction improved the degradation of CBZ, with the degradation efficiencies of 86%, 62%, and 68% in FeS2/Fe2O3/TA, FeS2/Fe2O3/AA, and FeS2/Fe2O3/CA systems, respectively. This investigation provides an innovative strategy for the removal of organic pollutants using natural minerals.

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