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Treatment of acid orange 7 solution by sunlight-Fenton process applying natural iron-bearing minerals.

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Title: Treatment of acid orange 7 solution by sunlight-Fenton process applying natural iron-bearing minerals.
Authors: Peng, Huiling1 (AUTHOR), Lai, Faying1,2 (AUTHOR), Xiong, Jiaping1,3 (AUTHOR), Lai, Rongsheng1 (AUTHOR), Gao, Lili1 (AUTHOR), Zhang, Yifeng1 (AUTHOR), Fang, Hansun1,2 (AUTHOR), He, Jinbao1,2 (AUTHOR) jinhe@jxau.edu.cn
Source: Solar Energy. Nov2025, Vol. 301, pN.PAG-N.PAG. 1p.
Subjects: Iron ions, Flocculation, Treatment effectiveness, Azo dyes, Catalysts, Iron catalysts, Haber-Weiss reaction, Photocatalytic oxidation
Abstract: [Display omitted] • Visible band contributed about 74% of the treatment effect of sunlight-Fenton. • Treatment efficiency strongly correlated with the contents of dissolved iron ions from minerals. • Photocatalytic oxidation had a certain contribution at low contents of dissolved iron ions. • Flocculation had obvious influence on the removal effect at high contents of dissolved iron ions. Natural pyrite, magnetite, ilmenite, V-Ti magnetite, magnesioferrite, and iron tourmaline were used as catalysts in sunlight-Fenton system for the treatment of azo dye acid orange 7 (AO7) solution. About 74 % of the treatment effect was contributed by the 400–780 nm visible band of simulated sunlight. There was a significant correlation between the treatment effect and the contents of total iron ions dissolved from minerals. By comparing with the homogeneous sunlight-Fenton system with equal contents of dissolved iron ions, it was found that the treatment effect of the mineral-catalyzed sunlight-Fenton mainly came from the homogeneous reaction of dissolved iron ions. In addition, the effect of direct sunlight photolysis and photo-assisted decomposition of H 2 O 2 was weak, while the photocatalytic oxidation of pyrite, magnetite and magnesioferrite after repeated use for 1 to 3 times had a certain contribution. The flocculation process due to the dissolved iron ions of pyrite, V-Ti magnetite and iron tourmaline had obvious influence on the sunlight-Fenton treatment effect. Iron tourmaline showed the most stable and efficient removal performance with about 30 % TOC removal rate in the system, which was related to a high quantity of leached iron ions rather than its ability to heterogeneously catalyze Fenton process. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • Visible band contributed about 74% of the treatment effect of sunlight-Fenton. • Treatment efficiency strongly correlated with the contents of dissolved iron ions from minerals. • Photocatalytic oxidation had a certain contribution at low contents of dissolved iron ions. • Flocculation had obvious influence on the removal effect at high contents of dissolved iron ions. Natural pyrite, magnetite, ilmenite, V-Ti magnetite, magnesioferrite, and iron tourmaline were used as catalysts in sunlight-Fenton system for the treatment of azo dye acid orange 7 (AO7) solution. About 74 % of the treatment effect was contributed by the 400–780 nm visible band of simulated sunlight. There was a significant correlation between the treatment effect and the contents of total iron ions dissolved from minerals. By comparing with the homogeneous sunlight-Fenton system with equal contents of dissolved iron ions, it was found that the treatment effect of the mineral-catalyzed sunlight-Fenton mainly came from the homogeneous reaction of dissolved iron ions. In addition, the effect of direct sunlight photolysis and photo-assisted decomposition of H 2 O 2 was weak, while the photocatalytic oxidation of pyrite, magnetite and magnesioferrite after repeated use for 1 to 3 times had a certain contribution. The flocculation process due to the dissolved iron ions of pyrite, V-Ti magnetite and iron tourmaline had obvious influence on the sunlight-Fenton treatment effect. Iron tourmaline showed the most stable and efficient removal performance with about 30 % TOC removal rate in the system, which was related to a high quantity of leached iron ions rather than its ability to heterogeneously catalyze Fenton process. [ABSTRACT FROM AUTHOR]
ISSN:0038092X
DOI:10.1016/j.solener.2025.113947