China Nonferrous Metallurgy

Phosphorus is one of the main limiting factors for eutrophication in water bodies, and the removal of phosphorus from the aqueous environment is of great significance for the management of eutrophication in water bodies. In this paper, LDHs have large specific surface area, good regeneration ability, and superior anion adsorption properties, making them excellent adsorption materials. A new type of Zn/Co-LDHs nano adsorption material was successfully prepared using zinc nitrate and cobalt nitrate as raw materials using hydrothermal method. The new adsorption material was characterized using SEM, XRD, IR and BET, and adsorption experiments were conducted on phosphorus-containing wastewater. The effects of material dosage, phosphate ion concentration and adsorption time on the adsorption effect were investigated.The results show that the Zn/Co-LDHs nanomaterials have a typical hydrotalcite-like structure and a large specific surface area; the adsorption isotherm of Zn/Co-LDHs on phosphate conforms to the Langmuir and Freundlich adsorption isotherms; the adsorption kinetic process follows pseudo-first-order kinetic model. Under the condition of 25℃, with the 1.0g/L dosage of Zn/Co-LDHs, the 10mg/L concentration of phosphate ions, the adsorption reached the adsorption equilibrium after 30min, and the maximum adsorption capacity was 6.3mg/g. Zn/Co-LDHs had excellent phosphorus removal effect on different types of eutrophic water bodies.