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Degradation of acetic acid by heterogeneous Fenton-like oxidation over iron-containing ZSM-5 zeolites

Paper ID Volume ID Publish Year Pages File Format Full-Text
45602 46416 2015 13 PDF Available
Title
Degradation of acetic acid by heterogeneous Fenton-like oxidation over iron-containing ZSM-5 zeolites
Abstract

•Iron-containing ZSM-5 zeolite catalysts were prepared by ion-exchange.•The activities of the catalysts were tested in Fenton-like oxidation of acetic acid.•IE-FeZSM-5(90) was determined as the effective and stable catalyst.•A COD reduction of 50.5% was achieved for 100 ppm acetic acid at optimum conditions.

In this study, the degradation of acetic acid was investigated by heterogeneous Fenton-like oxidation in the presence of iron-containing ZSM-5 zeolites. Iron content and Brønsted acidity of the catalyst affected positively and significantly the activity of catalyst in acetic acid (AA) degradation. The catalysts were prepared by ion-exchange method by using ZSM-5 type zeolites with different Si/Al ratio and characterized by XRD, SEM, FT-IR, ICP-AES and nitrogen adsorption measurements. The catalyst (IE-FeZSM-5 (90)) with Si/Al ratio of 42 and iron content of 8.5% (in wt) was found to be the most active catalyst in AA degradation. The influence of temperature, initial concentration of acid, amounts of H2O2 and catalyst and solution pH was investigated on degradation of AA by heterogeneous Fenton-like oxidation over this catalyst. Degradation of AA was accelerated at pH around 4 and temperature, H2O2 amount, catalyst loading and initial concentration of AA affected significantly the destruction of acid. The optimum conditions were obtained to be 0.2 g of catalyst, 333 K of temperature, solution pH of 4 and H2O2 amount of 8.35 mmol for an AA concentration of 0.1 g/dm3 with a COD removal of 50.5%. Degradation of AA obeyed first order kinetics with a rate expression of −rAA=2.56×107e−61.5/RTCAA−rAA=2.56×107e−61.5/RTCAA where −rAA in mol/dm3 min, R in kJ/mol.K, T in K and CAA in mol/dm3.

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Keywords
Heterogeneous Fenton-like oxidation; Acetic acid; Iron-containing ZSM-5 zeolites; COD removal.
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Degradation of acetic acid by heterogeneous Fenton-like oxidation over iron-containing ZSM-5 zeolites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 687–699
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us