Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 51, Pages 76782-76792Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-21077-1
Keywords
Discarded iron ore; Tetracycline hydrochloride; Persulfate-based advanced oxidation; Active free radicals; Heterogeneous catalyst
Categories
Funding
- Natural Sciences Foundation of China [52000163]
- Natural Science Foundation of Henan Province [202300410423]
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology [CJSZ2021001]
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In this study, a spent iron ore residue was collected from iron ore plants and used as a heterogeneous catalyst to activate peroxydisulfate for the degradation of tetracycline hydrochloride. The experimental results showed efficient removal of tetracycline hydrochloride with increasing iron ore dosage and acidic pH conditions. Characterization results revealed the dominant components of the iron ore and the transformation of Fe(II) to Fe(III) during tetracycline hydrochloride degradation. Quenching experiments and EPR detection confirmed the involvement of sulfate and hydroxyl radicals as the main reactive species. This study not only explores a novel way to recycle discarded iron ore but also expands its application in the activation of peroxydisulfate.
In the existing research, most of the heterogeneous catalysts applied in the activation of persulfate to degrade organic pollutants were synthesized from chemical reagents in the laboratory. In this paper, we have obtained a spent iron ore (JO) residue directly collecting from the iron ore plants, and efficiently activating peroxydisulfate (PS) to produce reactive free radicals. The experimental results demonstrated that the IO could effectively activate PS to degrade tetracycline hydrochloride (TCH), with TCH removal rate reaching up to 85.6% within 2 h at room temperature. The TCH removal rate was increased with increasing iron ore dosage, while the more acidic pH condition would be favorable to TCH removal process. The material characterization results demonstrated that the dominant components of IO were Fe3O4 and FeOOH. The transformation from Fe(II) to Fe(III) at the surface IO was observed after TCH degradation. What's more, the quenching experiment and EPR detection results confirmed that the sulfate radical (SO4 center dot-) and hydroxyl radicals (center dot OH) would be acting as the main free radicals for TCH degradation. This study could not only explore a novel way to recycle the discarded iron ore, but also further expand its application in an effective activation of PS in an aqueous solution.
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