Mingxia Wang *, Yu Liang, Wenfeng Tan College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China *E-mail：[email protected] Ningyou7 Tapidor Ningyou7 The optimal log K H of ≡FeOH -0.5 and ≡Fe 3 O -0.5 was 7.8 and 10.8 on the (110) facets, which was 7.7 and 11.7 on the (012) facets, respectively. The inner layer capacitance (C 1 ) of HNP and HNC was 0.95 and 1.30 F/m 2 . The (012) facets bind Pb via both bidentate and tridentate complexes while (110) facets bind Pb only through bidentate complexes at pH 3.0–6.5. Besides, (012) facets showed higher Pb adsorption and greater pH dependence than (110) facets. The experimental data retrieved from literature can be fitted by CD-MUSIC-eSGC model with the parameters obtained from this work. Accurate prediction of the environmental fate of Pb depends on the understanding of Pb coordination to mineral surfaces. Hematite as a widely-distributed iron oxide in soils, exists with various morphologies. Different exposed facets of hematite display distinct surface charge and adsorption properties. The objective of this study is to clarify the complex species of Pb on individual hematite facets using Charge Distribution-MUltiSIte Complexation with the extended Stern-Gouy-Chapman (CD-MUSIC-eSGC) model. Introduction Results Conclusions 1. Liang, Y.; Wang, M.; Xiong, J.; Hou, J.; Wang, X.; Tan, W.,Al-substitution-induced defect sites enhance adsorption of Pb 2+ on hematite. Environ. Sci.: Nano 2019, 6 (5), 1323-1331. 2. Xu, J.; Koopal, L. K.; Wang, M.; Xiong, J.; Hou, J.; Li, Y.; Tan, W., Phosphate speciation on Al-substituted goethite: ATR-FTIR/2D-COS and CD-MUSIC modeling. Environ. Sci.: Nano 2019. DOI: 10.1039/c9en00539k. References Facet-dependent surface charge and Pb 2+ adsorption characteristics of hematite: CD-MUSIC-eSGC modeling
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Mingxia Wang*, Yu Liang, Wenfeng Tan
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
*E-mail：[email protected]
Ningyou7 Tapidor Ningyou7
The optimal log KH of ≡FeOH-0.5 and ≡Fe3O-0.5 was 7.8 and 10.8 on the (110) facets, which was 7.7 and 11.7 on the (012) facets, respectively. The inner layer
capacitance (C1) of HNP and HNC was 0.95 and 1.30 F/m2.
The (012) facets bind Pb via both bidentate and tridentate complexes while (110) facets bind Pb only through bidentate complexes at pH 3.0–6.5. Besides, (012)
facets showed higher Pb adsorption and greater pH dependence than (110) facets.
The experimental data retrieved from literature can be fitted by CD-MUSIC-eSGC model with the parameters obtained from this work.
Accurate prediction of the environmental fate of Pb depends on the understanding of Pb coordination to mineral surfaces. Hematite as a widely-distributed iron
oxide in soils, exists with various morphologies. Different exposed facets of hematite display distinct surface charge and adsorption properties.
The objective of this study is to clarify the complex species of Pb on individual hematite facets using Charge Distribution-MUltiSIte Complexation with the
extended Stern-Gouy-Chapman (CD-MUSIC-eSGC) model.
Introduction
Results
Conclusions
1. Liang, Y.; Wang, M.; Xiong, J.; Hou, J.; Wang, X.; Tan, W., Al-substitution-induced defect sites enhance adsorption of Pb2+ on hematite. Environ. Sci.: Nano 2019, 6 (5), 1323-1331.
2. Xu, J.; Koopal, L. K.; Wang, M.; Xiong, J.; Hou, J.; Li, Y.; Tan, W., Phosphate speciation on Al-substituted goethite: ATR-FTIR/2D-COS and CD-MUSIC modeling. Environ. Sci.:
Nano 2019. DOI: 10.1039/c9en00539k.
References
Facet-dependent surface charge and Pb2+ adsorption
characteristics of hematite: CD-MUSIC-eSGC modeling
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