Advances in research on repairing heavy metal pollution in soil by clay minerals

Abstract

To reveal the repair potential and effect of clay minerals on heavy metal contaminated soil, this paper summarizes the application of common clay minerals such as kaolinite, montmorillonite and zeolite in the repair of heavy metals, and repairs heavy metals with clay minerals and biochar, lime and chelating agents. Correlation analysis illustrates the potential and mechanism of clay minerals for heavy metals. For one thing, clay minerals have a large specific surface area and a negative charge on the surface, which greatly increases their adsorption properties for heavy metals. for another, clay minerals have high nutrient elements and rich organic matter, Which increase soil fertility and trace elements, as well as crop yield. Clay minerals have been widely used in soil heavy metal pollution repair, but most of them still stay at the laboratory level. In the future, more attention should be paid to the application of clay minerals in practical engineering.