Modeling the aqueous reaction kinetics of estriol with ferrate

doi:10.1007/s11705-009-0098-4

Front Chem Eng Chin

2009, Vol. 3

Issue (1) : 39-45 https://doi.org/10.1007/s11705-009-0098-4

RESEARCH ARTICLE

Modeling the aqueous reaction kinetics of estriol with ferrate

Cong LI(

), Naiyun GAO

State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China

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Abstract

In this study the aqueous oxidation kinetics of estriol (E3) by potassium ferrate (K₂FeO₄), a chemical for its strong oxidizing power and for producing a coagulant from its reduced state (i.e. Fe(III)), was evaluated in the range of pH 8-12 with different molar ratios of the reactants. As the degree of Fe(VI) protonation varies with the solution pH, it was found that a first order model was not suitable to describe the oxidation reaction. This paper describes a theoretical representation that closely models the reaction kinetics of E3 and ferrate. From this modeling, the reaction rates of HFeO4-and FeO42-with E3 have been determined. The results show that the reactivity of HFeO4- with dissociated and undissociated E3 is greater than that of FeO42-, and that E3 is more reactive in its dissociated state.

Keywords ferrate estriol endocrine disruptor kinetics oxidation

Corresponding Author(s): LI Cong,Email:congilli@yahoo.com.cn

Issue Date: 05 March 2009

Cite this article:

Naiyun GAO,Cong LI. Modeling the aqueous reaction kinetics of estriol with ferrate[J]. Front Chem Eng Chin, 2009, 3(1): 39-45.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0098-4
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I1/39

Fig.1 XRD spectra of three KFeO samples

Fig.2 Molar fraction of Fe(VI) species at different pH

Tab.1 Rate constants of E3 degradation with ferrate(VI)

Tab.2 Rate constants of ferrate reduction with undissociated E3 and dissociated E3

Fig.3 Comparison of experimental data and pseudo first order reaction model for E3 degradation (A), and ferrate reduction at Fe(Ⅵ) : E3≥10 (B)

Fig.4 Comparison of experimental data and non-pseudo first order reaction model for E3 degradation (A), and ferrate reduction at Fe((Ⅵ) : E3≤5 (B)

Fig.5 Comparison of experimental data and new second order reaction model for E3 degradation (A), and ferrate reduction at Fe(VI) ∶ E3≥10 (B)

Fig.6 Comparison of experimental data and new second order reaction model for E3 degradation (A), and ferrate reduction at Fe(VI) ∶E3≤5 (B)

Fig.7 Comparison of experimental data and new second order reaction model for the degradation of steroid estrogens, EE2, E1, E2 and E3

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