Study on phosphorus adsorption properties of mechanical ball milling modified biochar-zeolite composites

Adsorption phosphorus removal is a sustainable treatment technology with dual functions of waste recycling and environmental protection. In this study, biochar and zeolite were modified by mechanical ball milling and compounded to study the adsorption effect of composite materials on phosphorus in water. The experimental materials were measured by scanning electron microscopy, Fourier transform infrared spectroscopy and specific surface area and pore size analyzer to reveal the phosphorus removal mechanism of the composite material. The results showed that the best preparation conditions for phosphorus adsorption efficiency of modified zeolite-peanut shell biochar and modified zeolite-corn straw biochar were ball milled at 600r/min for 4 h. When the initial concentration of phosphorus was 40 mg/L, the removal rate of phosphorus by modified zeolite-corn straw biochar was 76.74 %, and the removal rate of phosphorus by modified zeolite-peanut shell biochar was 77.63 %. In the environment of low concentration phosphorus solution, when the input amount of the two composites was 0.15 g, the removal rate of phosphorus reached 84.72 %. It can be seen that the modified zeolite-biochar composite adsorption material has good adsorption performance for phosphorus in water, which provides a broad application prospect for the study of phosphorus adsorption materials.