Abstract
Enzymatic decolourization of azo-dyes could be a cost-competitive alternative compared to physicochemical or microbiological methods. Stoichiometric and kinetic features of peroxidase-mediated decolourization of azo-dyes by hydrogen peroxide (P) are central for designing purposes. In this work, a modified version of the Dunford mechanism of peroxidases was developed. The proposed model takes into account the inhibition of peroxidases by high concentrations of P, the substrate-dependant catalatic activity of peroxidases (e.g. the decomposition of P to water and oxygen), the generation of oxidation products (OP) and the effect of pH on the decolourization kinetics of the azo-dye Orange II (OII). To obtain the parameters of the proposed model, two series of experiments were performed. In the first set, the effects of initial P concentration (0.01–0.12 mM) and pH (5–10) on the decolourization degree were studied at a constant initial OII concentration (0.045 mM). Obtained results showed that at pH 9–10 and low initial P concentrations, the consumption of P was mainly to oxidize OII. From the proposed model, an expression for the decolourization degree was obtained. In the second set of experiments, the effect of the initial concentrations of OII (0.023–0.090 mM), P (0.02–4.7 mM), HRP (34–136 mg/L) and pH (5–10) on the initial specific decolourization rate (q0) was studied. As a general rule, a noticeable increase in q0 was observed for pHs higher than 7. For a given pH, q0 increased as a function of the initial OII concentration. Besides, there was an inhibitory effect of high P concentrations on q0. To asses the possibility of reusing the enzyme, repeated additions of OII and P were performed. Results showed that the enzyme remained active after six reuse cycles. A satisfactory accordance between the change of the absorbance during these experiments and absorbances calculated using the proposed model was obtained. Considering that this set of data was not used during the fitting procedure of the model, the agreement between predicted and experimental absorbances provides a powerful validation of the model developed in the present work.







Abbreviations
- A :
-
absorbance
- A f :
-
absorbance at the end of the a decolourization experiment
- A min :
-
minimum absorbance obtained under the excess of hydrogen peroxide
- E :
-
dissociated form of the enzyme
- E 0 :
-
resting state of the enzyme
- E 1 :
-
compound I of the enzyme
- E 2 :
-
compound II of the enzyme
- HE :
-
non-dissociated form of the enzyme
- HRP :
-
horseradish peroxidase
- OII :
-
Orange II
- OP :
-
oxidation products of Orange II
- P :
-
hydrogen peroxide
- P C :
-
critical hydrogen peroxide concentration
- q 0 :
-
initial specific decolourization rate
- S :
-
reducing substrate
- V S0 :
-
initial reducing substrate consumption rate
- V D0 :
-
initial decolourization rate
- V S :
-
reducing substrate consumption rate
- V D :
-
decolourization rate
- X :
-
oxidation products obtained at basic conditions
- Y :
-
oxidation products obtained at acid conditions
- Y P/S :
-
observable stoichiometric coefficient of decolourization
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Acknowledgements
The authors gratefully acknowledge the financial support from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), by Universidad Nacional de la Plata (UNLP) and by Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Argentina.
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Morales Urrea, D.A., Haure, P.M., García Einschlag, F.S. et al. Horseradish peroxidase-mediated decolourization of Orange II: modelling hydrogen peroxide utilization efficiency at different pH values. Environ Sci Pollut Res 25, 19989–20002 (2018). https://doi.org/10.1007/s11356-018-2134-8
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DOI: https://doi.org/10.1007/s11356-018-2134-8