Abstract
This study is to determine the spatial distribution characteristics of Cu and Zn adsorption on the sediments of the estuary of Dianchi Lake, as well as the composite adsorption law of Cu and Zn on combinations of sediment organic matter, metal oxides, and organic–inorganic composites. The relationship between the adsorption contribution of each component of the substance. A static adsorption experiment was applied to the sediments in the estuary of Dianchi Lake. The relationship between adsorption capacity and sediment composition was analyzed through correlation analysis and redundant analysis. The results show that along the direction of the river flow and the vertical depth, the adsorption capacity presents a relatively obvious spatial distribution law; the change trend of sediment component content is not the same as the change trend of Cu and Zn adsorption capacity. The change trend of the sediment component content is not the same as the change trend of the adsorption amount of Cu and Zn, and the compound effect between the components affects the adsorption amount. The adsorption of Cu by the four groups of sediments after different treatments is more in line with the Freundlich isotherm adsorption model; When adsorbing Zn, the untreated and removed organic matter and iron-aluminum oxide group are in good agreement with the Freundlich model, while the organic matter-removed group and the iron-aluminum oxide removal group are more consistent with the Langmuir isotherm adsorption model; The adsorption contribution rate of organic–inorganic composites in sediments is not a simple addition of organic matter and iron-aluminum oxides, but a more complex quantitative relationship.
Highlights
This study is to determine the spatial distribution characteristics of Cu and Zn adsorption on the sediments of the estuary of Dianchi Lake, as well as the composite adsorption law of Cu and Zn on combinations of sediment organic matter, metal oxides, and organic–inorganic composites
This study will investigate the spatial distribution characteristics of Cu(II) and Zn(II) adsorption on sediments at the vertical depth of the estuary and the river flow, and the organic matter, metal oxides, organic–inorganic composites of the sediments affect the adsorption of Cu(II) and Zn(II) on the sediments, especially the contribution rate of heavy metals adsorption between organic matter, metal oxides, and organic–inorganic composites relation, in order to understand the sedimentation laws of heavy metals in natural waters in depth, it is helpful to reveal the adsorption mechanism of wetland sediments to heavy metals, and obtain a combination of adsorption influencing factors with stronger adsorption capacity, which is the preparation of the key bottom matrix material in the construction and restoration of wetlands
Especially according to the characteristics of heavy metals adsorbed in the sediments at the mouth of the lake, remediation measures are taken according to local conditions to form a project implementation technical plan for the prevention of heavy metals in natural water
Summary
This study is to determine the spatial distribution characteristics of Cu and Zn adsorption on the sediments of the estuary of Dianchi Lake, as well as the composite adsorption law of Cu and Zn on combinations of sediment organic matter, metal oxides, and organic–inorganic composites. This study will investigate the spatial distribution characteristics of Cu(II) and Zn(II) adsorption on sediments at the vertical depth of the estuary and the river flow, and the organic matter, metal oxides, organic–inorganic composites of the sediments affect the adsorption of Cu(II) and Zn(II) on the sediments, especially the contribution rate of heavy metals adsorption between organic matter, metal oxides, and organic–inorganic composites relation, in order to understand the sedimentation laws of heavy metals in natural waters in depth, it is helpful to reveal the adsorption mechanism of wetland sediments to heavy metals, and obtain a combination of adsorption influencing factors with stronger adsorption capacity, which is the preparation of the key bottom matrix material in the construction and restoration of wetlands. Especially according to the characteristics of heavy metals adsorbed in the sediments at the mouth of the lake, remediation measures are taken according to local conditions to form a project implementation technical plan for the prevention of heavy metals in natural water
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