Using peanut shells as raw material and potassium carbonate as the modifier,a series of biochar materials(BC,KBC35％,KBC50％and KBC65％)were calcined in nitrogen at 500 ℃.The structures of the carbon materials were characterized by XRD,SEM,TEM,BET and FTIR,and their adsorption properties of ammonia nitrogen were studied.The results showed that the modified biomass carbon exhibited an obvious pore structure.When the pH was 7,the dosage was 2.5 g/L,and the reaction time was 80 min,the adsorption effect of KBC50％on ammonia nitrogen was the best,with a removal rate of 98.26％and an adsorption capacity of 19.65 mg/g.The fitting results of kinetic and isothermal adsorption models showed that KBC50％conforms to the quasi-first-order kinetic model and Langmuir isothermal adsorption model,indicating that the adsorption is mainly monolayer physical adsorption.
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