The Research on Adsorption of Cd (II) by Magnetic Biochar

Abstract In order to get a deepen understanding of the impact on environmental behavior of Cd (II) made by application of magnetic biochar, this article discusses possible adsorption mechanism of magnetic biochar to Cd (II). We made six magnetic biochars through coprecipitation method and pyrolysis under N2 at 200°C-600°C using pine and corn straw. The magnetic biochars (MB) were characterized by element analyzer, FTIR, zeta potential and SEM. the adsorption behavior was studied by batch experiments. The resuls are as follows: with pyrolysis temperature improving, indicators such as pH, aromaticity, surface area of magnetic biaochars improves; the Freundlich model shows better fitting result of adsorpiton to Cd(II) by magnetic biochar and 400°C magnetic biochars have highest capacity for Cd(II) with MB coming from corn straw higher performance.