Evaluation of Fe-Functionalized 4A Zeolite as Ozone Catalyst for an Enhancement of Hydroxyl Radical Pathway in a Multiphase Reactor

ABSTRACT

Iron doping 4A zeolite (Fe-4A) was prepared and demonstrated as ozone catalyst to enhance hydroxyl radical (HO·) pathway. Fe-4A composites with different iron load were characterized, and the catalytic effects were discussed dealing with para-chlorobenzoic acid (p-CBA), atrazine (ATZ), and oxalic acid (OA) as model compounds. Results showed that Fe-4A/ozone system promoted the production of HO·, which was in-line with the strength of Lewis acidity that might have accelerated ozone-to-HO· transformation. Modeled R_CT value validated the enhanced HO· exposure during catalysis that was more evident for 4%-Fe-4A. The Fe-4A exhibited structural stability and allows repeated use after facile regeneration.

KEYWORDS:

• 4A Zeolite
• catalytic ozonation
• hydroxyl radical
• iron doping
• lewis acidity

Acknowledgments

We thank the financial support by the National Natural Science Foundation of China (51608349) and the China Postdoctoral Science Foundation (2017M621139).

Supplementary material

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Additional information

Funding

This work was supported by the China Postdoctoral Science Foundation [2017M621139]; National Natural Science Foundation of China [51608349].