磁性含碘生物炭的制备及其水处理应用.

Taking agricultural waste straw as raw material, magnetic biochar was first prepared by pyrolysis, and then magnetic iodine-containing biochar nanocomposites with photo-response were prepared by solvothermal method. In order to test the application effect of the prepared materials, the adsorption and photocatalytic degradation of the dye rhodamine B（Rh B） in water were studied using the prepared materials as adsorbent and photocatalyst. The results show that the prepared composite has the structural characteristics of magnetite Fe3O4. After combining with iodine, the saturation magnetization of the sample decreases, but it can still be absorbed by the external magnetic field. The prepared samples have larger specific surface area, total pore volume and larger pore size. The material has an irregular shape and structure, and elements such as Fe, O and I are evenly distributed in the matrix structure of the main biochar. The results of adsorption-photocatalysis experiments show that the prepared composite has high adsorption and photocatalysis properties, making the maximum degradation rate of Rh B reach 94.71%. It realizes the purpose of “turning waste into treasure” and “treating waste with waste”, and provides methods and guidance for the effective utilization of other agricultural and forestry wastes and urban garbage, which has a good practical application prospect.  [ABSTRACT FROM AUTHOR]