Mechanism and modeling of hexavalent chromium interaction with a typical black soil: the importance of the relationship between adsorption and reduction

Zhang, Jia; Yin, Huilin; Barnie, Samuel; Wei, Minghai; Chen, Honghan

doi:10.1039/c8ra08154a

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…The adsorption process can be divided into two stages, fast and slow. This is because the black soil followed the "adsorption-reduction" mechanism for the retention of Cr(VI) as reported by our previous research (Zhang et al 2017), that is, Cr(VI) is quickly adsorbed to the black soil surface, and the adsorbed Cr(VI) is reduced to Cr(III) by the reducing functional group in the soil organic matter (such as phenolic groups and hydroxylic groups), wherein the reduction process is a rate limiting step of the entire reaction (Zhang et al 2019a). That is why the adsorption amount of Cr(VI) increases rapidly in the initial stage of the reaction and then rises slowly, which also indicates that the reduction reaction of Cr(VI) by black soil is still going on.…”

Section: Kinetic and Thermodynamic Experimentsmentioning

confidence: 82%

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New insight into mechanism of Cr(VI) migration and transformation in typical soils of chromite ore processing residue (COPR) contaminated sites

Wei

Tang

et al. 2021

Environ Earth Sci

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Chromite ore processing residue (COPR) storage sites are widely distributed all over the world, causing serious soil and groundwater pollution. However, the differences in soil constituents and properties between different regions are significant, and the dynamic migration and transformation of Cr(VI) in different types of soil under alkaline condition of the COPR site is still unclear. In this study, the typical black soil, red soil and loess in different regions of China were chosen to investigate the adsorption kinetics and thermodynamics of Cr(VI) under the original pH conditions of the soil, and then the alkaline Cr(VI) solution was introduced into the soil column to simulate the dynamic migration and transformation process of Cr(VI) at COPR sites. According to the results, the Cr(VI) breakthrough curve predicted by the solid-liquid distribution coefficient Kd based on the static isotherm adsorption experiments significantly underestimated and overestimated the retention effect of black soil and red soil on Cr(VI) dynamic migration, respectively. For the black soil, the retention of Cr(VI) was dominated by Cr(VI) reduction, which is a slow reaction compared with Cr(VI) adsorption. Therefore, the reduction kinetics process during the column experiment cannot be neglected. In respect to the red soil, the outlet Cr(VI) concentration turned to be higher than the inlet concentration with the soil alkalization, which indicated that the adsorbed Cr(VI) desorbed again, and this is the main reason for the overestimation of Cr(VI) retention effect by the red soil. This study shows that the environmental risks of Cr in different types of soil are quite different, mainly related to the valence and occurrence form of Cr that governed by the soil constituents and properties. In addition, 2 the stable form of Cr in the black soil column after the reaction indicates that the soil organic matter can be used as a potential environmentally friendly remediation material for Cr(VI) contaminated soils at COPR sites.

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Section: Kinetic and Thermodynamic Experimentsmentioning

confidence: 82%

“…The migration and transformation processes of Cr(VI) in soil is closely related to soil material composition and physicochemical properties (Kožuh et al 2000;Zhang et al 2019a). The inorganic minerals in the soil have different degrees of adsorption and reduction on Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

New insight into mechanism of Cr(VI) migration and transformation in typical soils of chromite ore processing residue (COPR) contaminated sites

Wei

Tang

et al. 2021

Environ Earth Sci

Self Cite

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Understanding the abiotic mechanisms for the removal of Cr(VI) through interactions with the components of an Oxisol and peat as part of a nature-based solution

Maronezi¹,

Shinzato²

2023

Water Air Soil Pollut

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Oxidation of trivalent chromium induced by unsaturated oils: A pathway for hexavalent chromium formation in soil

Jiang

Tang

et al. 2021

Journal of Hazardous Materials

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Mechanism and modeling of hexavalent chromium interaction with a typical black soil: the importance of the relationship between adsorption and reduction

Abstract: A novel two-step kinetic model was developed based on the proposed “adsorption–reduction” mechanism of Cr(vi) retention by a typical black soil.

Cited by 4 publications

References 47 publications

New insight into mechanism of Cr(VI) migration and transformation in typical soils of chromite ore processing residue (COPR) contaminated sites

New insight into mechanism of Cr(VI) migration and transformation in typical soils of chromite ore processing residue (COPR) contaminated sites

Understanding the abiotic mechanisms for the removal of Cr(VI) through interactions with the components of an Oxisol and peat as part of a nature-based solution

Oxidation of trivalent chromium induced by unsaturated oils: A pathway for hexavalent chromium formation in soil

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