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Study of Fe(III)-NTA chelates stability for applicability in photo-Fenton at neutral pH

Paper ID Volume ID Publish Year Pages File Format Full-Text
45467 46412 2015 8 PDF Available
Title
Study of Fe(III)-NTA chelates stability for applicability in photo-Fenton at neutral pH
Abstract

•Fe(III)-NTA solution is generally stable under stress for temperature changes.•Temperature control is required to extend the chelates lifetimes under irradiation.•Organic radicals can be produced by chelates decomposition.•UV-C radiation involves the highest rate of chelates decomposition.

The stability of ferric nitrilotriacetate chelates (Fe(III)-NTA) was studied under thermal, oxidative and photochemical stress. The knowledge of chelate stability is fundamental to correctly implement the management system of wastewater treatment plant for application of chelates as catalyst in photo-Fenton process at neutral pH. Fe(III)-NTA solution stability was monitored under different temperature conditions (T = 10–30 °C), in presence and absence of UV-A irradiation and by adding three different concentrations of H2O2. The additional effect on chelate stability caused by different irradiation source (UV-A, UV-C and Xenon lamps) was also evaluated. Although the complexes were stable under the temperature test range, temperature control is crucial when stressing the solution by irradiation or by adding hydrogen peroxide. The solution was kept stable during two hours of reaction under UV-A irradiation only when temperature was set at 10–15 °C while in presence of hydroxyl radicals (HO) the temperature control could only reduce the chelates decomposition. Fe(III)-NTA solution mineralization could be obtained under irradiation and radical strain. Thus, the production of organic radical from free ligands was also demonstrated. Finally, the suitableness of UV-C lamps as light source for the process application was questioned since they caused a strong degradation of the chelate solution. Indeed, only 30 min of UV-C irradiation by adding 0.59 mM of hydrogen peroxide caused almost 90% reduction of the chelate content in the solution.

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Keywords
Chelating agent; NTA; Iron; Neutral pH; Stability; AOPs
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Study of Fe(III)-NTA chelates stability for applicability in photo-Fenton at neutral pH
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 179, December 2015, Pages 372–379
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