Impact of Temperature and Type of Clay Double Layer Cation on Adsorption of Copper Heavy Metal Contaminant

Bentonite is commonly used as a liner in landfills to prevent the leaching of the waste leachate to the groundwater (Yong et al., 1992; Abollino et al., 2003; Zhan et al., 2022). Sodium-bentonite and calcium-bentonite are among the useful materials for this purpose. On the other hand, in several cases clayey soils are exposed to high temperature in engineering and geo-environmental engineering projects (Tan et al., 2004). Dehydration and de-hydroxylation are the two major phenomena during heating process of clayey soils (El Warid et al., 2022). In spite of several researches on the interaction of heavy metals and clayey soils, there are lack of research on the subject of mutual effect of temperature and double layer cation type on the adsorption of heavy metals in clayey soil. Therefore, the main objective of this paper is to investigate on the impact of temperature and type of double layer cation on adsorption of copper heavy metal by the clayey soils with high plasticity index. To achieve the above mentioned objective, calcium chloride salt was used to make homo-ionic bentonite. Several types of geo-environmental engineering experiments were performed to address and to achieve the above mentioned objective.