Adsorption Performance of Sulfamic Acid-modified Peanut Shell Biochar on Microcystin-LR
The modified peanut shell biochar was prepared by sulfamic acid-modified pyrolysis,characterised by SEM,BET and XPS,and adsorption experiments on microcystin-LR in water were carried out.The results showed that the modified biochar surface had micron-sized pores and bubble-like agglomerates,the specific surface area and pore volume increased,new sulfonic acid groups were added,and oxygen-containing functional groups increased;the adsorption process conformed to the second-order kinetics,and the adsorption isotherm conformed to the Freundlich model;excessive pH and large molecular weight dissolved organic matter significantly inhibited the adsorption;and the adsorption mechanism involved pore-filling effect,electrostatic interaction,hydrogen bonding and π-π interaction.
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