Adsorption Models and Kinetic Analysis of Molybdenum on the Sediment of the Yellow River in China

Abstract

The Yellow River basin is rich in sediment that provides a transport carrier for the transport and diffusion of pollutants. Molybdate ions contained in the tributaries of the Yellow River are dispersed with the water and sediment movement to the whole basin, which will result in water pollution and soil pollution within a certain range. The static adsorption method is adopted to study the adsorption of molybdate ions onto the Yellow River sediment, the adsorption model of molybdate on sediment can be obtained from the experimental data and kinetic analysis can be carried out to lay a good foundation for exploring molybdenum adsorption and removal in actual water flow. The effects of contact time, pollutant concentration, sediment concentration, and agitation frequency on the molybdenum adsorption onto sediment were investigated. In the process of sediment-molybdenum adsorption, the kinetics and isothermal adsorption conformed to the Lennard-Jones equation model and the Freundlich model, respectively. Simultaneously increasing the molybdenum concentration, sediment content, and agitation frequency enhances the adsorption of molybdate onto sediment particles. Higher concentrations within a specific range have a more pronounced effect.