Adsorption Properties of Pb2+ by Ferric Hydroxide Loaded White Rot Fungi

Abstract

In order to explore the environmental effect of white rot fungi in the formation process of iron hydroxide, white rot fungi loaded with iron hydroxide were used as adsorbent to study the adsorption performance of lead simulated wastewater. The results showed that the iron hydroxide products formed by the mineralization of white rot fungi significantly improved the adsorption effect of heavy metals on the fungus balls. The optimal adsorption conditions were obtained as follows: pH value of 6 at room temperature, initial lead ion concentration of 700 mg/L, adsorbent dosage of 1 g. The adsorption kinetics study shows that when the Pb2+ concentration is less than 1000 mg/L, the quasi-first-order kinetic equation can be used to fit better. When the Pb2+ concentration is 1000 mg/L, the main velocity control process is the quasi-second-order kinetic equation. SEM-EDS was used to characterize the microspheres before and after adsorption. It was found that the surface morphology of white rot fungi loaded with iron oxides changed from uneven to massive mass after adsorption of Pb2+, and the upper layer was covered with a layer of dense spherical lead particles. The different pH conditions also have an effect on the morphology of the microsphere surface, which will make its surface form into clusters of columns.