Influence of pyrite on oxidative treatment of diclofenac with zero-valent iron/H2O2 system coupled with chemical precipitation under controlled and uncontrolled pH conditions

Date

2024-01-20

Author

Oral, Ozlem
KANTAR, ÇETİN
Yıldız, İlker

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Batch experiments, combined with surface measurements, were conducted to elucidate the impact of pyrite on diclofenac treatment by zero-valent iron (ZVI)/H2O2 system. In binary systems with ZVI/H2O2, diclofenac removal was limited under controlled-pH conditions due to the agglomeration of ZVI particles and low rate of iron leaching. However, the use of pyrite in batch systems under uncontrolled-pH conditions drastically increased diclofenac removal by the ZVI/H2O2 system due to a significant drop in pH and enhanced iron dissolution. The diclofenac removal by the ternary ZVI/pyrite/H2O2 system could be explained through a combined effect of adsorption, oxidative degradation of diclofenac with hydroxyl radicals (*OH) and chemical precipitation of diclofenac and/or its intermediate species with the iron species dissolved from the ZVI/pyrite particles. While adsorption/chemical precipitation accounted for 75% of diclofenac removal in the initial stage, oxidative degradation achieved the remaining 25% diclofenac removal in the second stage. Surface analyses show that, in systems with diclofenac, the iron species dissolved from ZVI and pyrite particles complexed with diclofenac and/or intermediate species to form some spherical particles. Overall, this study sheds light on the reaction mechanism for the practical application of the ternary ZVI/pyrite/H2O2 system to diclofenac removal.

Subject Keywords

Chemical precipitation, Degradation, Diclofenac, Fenton, Pyrite, Zero-valent iron

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85183154776&origin=inward
https://hdl.handle.net/11511/108617

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Test and Measurement Center In advanced Technologies (MERKEZ LABORATUVARI), Article