Thermodynamic Characteristics and Mechanisms of Estrogen Hormones Adsorption on Soil Doped with MnO2

doi:10.7503/cjcu20120598

Abstract

Abstract:

Adsorption conditions of multiple estrogen compounds on soil doped MnO₂ were optimized by factorial experiment design. The thermodynamic characteristics and thermodynamic properties in the course of estrogen hormones adsorption on soil doped MnO₂ were investigated by Langmuir adsorption isotherm and Gibbs equation. Finally, the adsorption mechanism of multiple estrogen compounds on soil doped MnO₂ was explored by Fourier transform infrared spectroscopy and liquid chromatography-mass spectrometry technology, and the main degradation products were analyzed. The experiment results showed that estrogen concentration and MnO₂ had significant positive effects on adsorption capacity of estrogen compounds on soil doped MnO₂, and the amount of soil had negative effect. The pH value had positive effect on the adsorption capacity of E2 but negative effect on E3 adsorption. The adsorption behavior of estrogen compounds on soil doped MnO₂ could be described by Langmuir adsorption isotherm(R²>0.99). All the calculated ΔG values of estrogen hormones in the course of adsorption were negative, and their absolute values were less than 40 kJ/mol. It demonstrated that the adsorption of the estrogen hormones on soil is a spontaneous physical adsorption process. The adsorption of estrogen hormones on soil doped MnO₂ both had physical adsorption and chemical degradation. The degradation reaction was improved which was probably resulted from the enhancement of conductive property of MnO₂ through organic carbons in soil. Therefore, MnO₂ can be used as a stabilization agent for the soil, which could effectively prevent secondary pollution of estrogen hormones caused by desorption.

Key words: Soil, Estrogen compounds, Manganese dioxide, Thermodynamic adsorption, Immobilization

CLC Number:

O647.3
X132

TrendMD:

LI Yu, ZHANG Chen, LIU Jian-lin, LI Xiao-Peng, WANG Xia-Jiao. Thermodynamic Characteristics and Mechanisms of Estrogen Hormones Adsorption on Soil Doped with MnO₂[J]. Chem. J. Chinese Universities, 2013, 34(3): 634.

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Thermodynamic Characteristics and Mechanisms of Estrogen Hormones Adsorption on Soil Doped with MnO₂

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