Mechanism and Chemical Stability of U(VI) Removal by Magnetic Fe3O4 @Biochar Composites.

Biochar is typically made via pyrolysis of organic materials under anoxic conditions, due to its high surface area and significant negative charge. It also has the ability to minimize the mass or volume of waste items. As a result, biochar is frequently used in the remediation of environmental contamination. To overcome the shortcoming of biochar in the application, the magnetic Fe₃O₄@Biochar from walnut shells were prepared. The magnetic Fe₃O₄@Biochar from walnut shells is used to study the adsorption of U(VI) in the solution. SEM, XRD, and FT-IR are used to determine the properties of magnetic Fe₃O₄@Biochar. The results revealed that magnetic Fe₃O₄@Biochar has a fragmented and irregular form. On the surface of magnetic Fe₃O₄@Biochar, several functional groups can aid in the adsorption of pollutants. The adsorption capacity of U(VI) by magnetic Fe₃O₄@Biochar is influenced by the contact time and initial concentration of U(VI). For the adsorption of U(VI) in solution by magnetic Fe₃O₄@ Biochar, the pseudo-first-order kinetic equation and the Langmuir isotherm equation can be fitted. The adsorption of the process is chemical adsorption and monolayer adsorption. The chemical stability of magnetic Fe₃O₄@Biochar is very well. [ABSTRACT FROM AUTHOR]