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Reaction kinetics formulation with explicit radiation absorption effects of the photo-Fenton degradation of paracetamol under natural pH conditions

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Abstract

The degradation of paracetamol (PCT) in an aqueous medium using the Fenton and photo-Fenton reactions was investigated. The aim of this research was the development of a kinetic model based on a reaction mechanism, which includes two main intermediates of PCT degradation and the local volumetric rate of photon absorption (LVRPA). Ferrioxalate was used as a catalyst and the working pH was adjusted to 5.5 (natural pH). Experimental work was planned through a D-optimal experimental design and performed in a flat plate reactor irradiated by a solar simulator. Hydrogen peroxide (HP) concentration, reaction temperature, and radiation level were the operating parameters. The photo-Fenton reaction allowed to reach a minimum relative PCT concentration of 2.01% compared to 5.04% achieved with Fenton reaction. Moreover, the photo-Fenton system required a 50% shorter reaction time and lower HP concentration than in dark conditions (90 min and 189 mg L-1 vs. 180 min and 334 mg L-1, respectively). The experimental results were used to estimate the kinetic parameters of the proposed kinetic model employing a nonlinear, multi-parameter regression method. The values obtained from the normalized root-mean-square error (14.52, 1.96, 4.36, 13.16, and 8.72 % for PCT, benzoquinone, hydroquinone, HP, and oxalate, respectively) showed a good agreement between the predicted and experimental data.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

A 1 :

Reparametrized Arrhenius pre-exponential factor

B 1 :

Reparametrized Arrhenius parameter

C :

Concentration (mg L-1)

E :

Activation energy (kJ mol-1)

e a :

Local volumetric rate of photon absorption (LVRPA) (Einstein cm-3 s-1)

k :

Kinetic constant (M-1 s-1)

L :

Reactor length (cm)

q :

Net radiation flux (Einstein cm-2 s-1)

R :

Reaction rate (M s-1)

:

Ideal gas constant (kJ mol-1 K-1)

T :

Temperature

t :

Time (s)

V :

Volume (cm3)

x :

Spatial coordinate (cm)

α :

molar absorptivity (m2 mol-1)

κ :

Volumetric absorption coefficient (m-1)

Φ :

Global quantum yield (mol Einstein-1)

ϒ :

Specific consumption of the oxidizing agent (mg HP/mg PCT)

(C2O4)2- :

Relative to oxalate ion

BQ:

Relative to 1,4-benzoquinone

exp:

Experimental value

Fe2+(C2O4):

Relative to ferrous-oxalate complex

Fe3+(C2O4)3 3- :

Relative to ferric-oxalate complex

HP:

Relative to hydrogen peroxide

HQ:

Relative to hydroquinone

i :

Relative to i-th specie

irr:

Relative to irradiated

mod:

Model value

PCT:

Relative to paracetamol

R:

Relative to photoreactor

W:

Reactor wall property

λ:

Dependence on wavelength

0:

Initial condition

irr:

Relative to irradiated

ref:

Reference value

rel:

Relative value

T:

Thermal rate

t:

Referred to a characteristic reaction time

tot:

Relative to total treated volume

〈 〉V :

Volume-averaged value

References

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Acknowledgments

Bárbara N. Giménez particularly acknowledges Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) for the PhD scholarship.

Funding

The authors are grateful to Universidad Nacional del Litoral (UNL, CAI+D PJ 50020150100028LI, CAI+D PJ 0020150100093LI, and PICT N° 2018-1415), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, PIP 2015-2017 GI), and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT, PICT N° 2015-2651 and PICT N° 2017-0744) for financial support.

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Authors and Affiliations

Authors

Contributions

All persons who meet authorship criteria are listed as authors, and all authors certify that they have participated sufficiently in the work to take public responsibility for the content. BNG, AVS, OMA, and LOC contributed to the study conception and design. BNG, AVS, and LOC performed the experiments and data collection. BNG, AVS, and LOC analyzed all the data and made theoretical calculations. BNG, AVS, and LOC wrote the main manuscript text and prepared the figures and tables. AVS, OMA, and LOC obtained funding for the research. BNG, AVS, OMA, and LOC reviewed the manuscript, made amendments, and contributed with their expertise. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Orlando M. Alfano.

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The authors declare that they have no competing interests.

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Responsible Editor: Vítor Pais Vilar

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Giménez, B.N., Schenone, A.V., Alfano, O.M. et al. Reaction kinetics formulation with explicit radiation absorption effects of the photo-Fenton degradation of paracetamol under natural pH conditions. Environ Sci Pollut Res 28, 23946–23957 (2021). https://doi.org/10.1007/s11356-020-11993-5

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  • DOI: https://doi.org/10.1007/s11356-020-11993-5

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