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Photodegradation of nonylphenol in aqueous solution by simulated solar UV-irradiation: The comprehensive effect of nitrate, ferric ion and bicarbonate

Paper ID Volume ID Publish Year Pages File Format Full-Text
25962 43925 2016 7 PDF Available
Title
Photodegradation of nonylphenol in aqueous solution by simulated solar UV-irradiation: The comprehensive effect of nitrate, ferric ion and bicarbonate
Abstract

•The photodegradation of NP was studied by Suntest-CPS+ photo simulator.•The degradation reaction of NP obeyed pseudo-first-order kinetics.•NO3− could accelerate the photodegradation of NP by a factor of more than 3.•The strong synergy between NO3− and HCO3− resulted in NP removal of 95% in only 30 min.•Fe3+ contributed little to the interaction in the combination with NO3− and HCO3−.

A Suntest-CPS+ sunlight simulator was used to investigate the direct and indirect photolysis of nonylphenol (NP) exposing to simulated sunlight in aqueous solution. The degradation reaction of NP obeyed a pseudo-first-order kinetics. Based on the pseudo-first-order rate constant (k) obtained from experimental data, the half-life of NP was calculated under different conditions, which ranged from 0.41 to 2.39 h. The affecting factors (NO3−, Fe3+ and HCO3−), especially their interactions on NP photodegradation, were systematically studied for the first time in the present study. The results showed that NO3− significantly influenced the photodegradation of NP and had a degradation ceiling. NO3− and HCO3− exhibited a synergistic effect on the photodegradation of NP and this interaction was very strong, which showed an abnormal phenomenon in dynamics, whereas the influence of Fe3+/HCO3− was slight on the photodegradation of NP. In addition, Fe3+ contributed little to the interaction in combining with other ions (NO3− and HCO3−). The light-absorbing ions (NO3− and Fe3+) with low concentration could inhibit the photolysis of NP only at the beginning of degradation process, indicating that the competition for energy and photons between NP molecule and light-absorbing ions is stronger than the photosensitizing effect at the initial stage. But this effect diminished with prolonged irradiation. Additionally, it was proved that the formation of free radicals during the photodegradation reaction was not the rate-determining step in NP indirect photodegradation. Meanwhile, compared with HO, CO3− had a higher oxidation rate on NP degradation, attributed to the generation of the more stable transition state between NP and CO3− during the degradation process.

Keywords
Photodegradation; Nonylphenol; Nitrate; Ferric ion; Bicarbonate; Simulated solar UV-irradiation
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Photodegradation of nonylphenol in aqueous solution by simulated solar UV-irradiation: The comprehensive effect of nitrate, ferric ion and bicarbonate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 326, 15 July 2016, Pages 9–15
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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