Preparation of peanut shell biochar and its adsorption performance on Rhodamine B in water
Using peanut shell as raw material and KOH as modifier,peanut shell biochar was prepared for adsorption of Rhodamine B in water by oxygen-limited pyrolysis at 200℃.The effects of initial concentration of Rhodamine B,pH of solution,adsorption time and dosage of biochar on the adsorption of Rhodamine B were investigated by single factor experiment,and the adsorption mechanism was also analyzed.The results showed that at the dosage of 20 mg,the volume of 25.00 mL,the initial concentration of 1.00 mg/L,the rotate speed of 150 r/min and the adsorption time of 75 min,the removal rate reached 97.90%.The results of parameter fitting showed that the adsorption process of Rhodamine B by modified peanut shell biochar followed the quasi-second-order kinetic equation(R2=0.9982),and the adsorption isotherm followed the Langmuir isotherm adsorption model,which belonged to single molecular layer chemisorption.
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