Adsorption Behavior of Fe-Based Ternary Magnetic Ldhs for Naphthalene Acetic Acid: Role of Fe Element

Abstract

ABSTRACT,Naphthalene acetic acid (NAA) is an auxin plant growth regulator (PGR) and widely used to regulate the growth process of plants. As excessive NAA enter the environment, it damage the ecological environment and endanger human life and health. The removal of NAA in the environment have become crucial. Layered bimetallic hydroxides (LDHs) are widely used for the adsorption of pollutants due to their large surface area and excellent structural properties. Based on the classical Fe3O4@MgAl-LDH material, Fe3O4@FeMgAl-LDHs were synthesized by adding different contents of Fe element to adsorb NAA in water. The morphology and properties of Fe3O4@FeMgAl-LDHs and the effect of Fe on adsorption efficiency were studied. The adsorption process and adsorption mechanism of NAA were analyzed. The results indicate that the equilibrium adsorption capacity increases first and then decreases as the Fe content increases. The maximum adsorption capacity for NAA can reach 330.1 mg/g when the proportion of Fe is 0.50. The adsorption efficiency of various PGRs were deeply explored. Fe3O4@FeMgAl-LDH (Fe-0.50) has good adsorption and regeneration ability for various PGRs.

Keywords: Fe3O4@FeMgAl-LDHs, NAA, Adsorption, Fe content