柚子皮生物炭的制备及对水体中锰离子的吸附

摘要

Pomelo peels were pyrolyzed and charred to obtain biochar after sodium sulfide treatment and was used as adsor-bent to remove Manganese(Ⅱ) in aqueous solution .The effects of pH ,biochar dosage and initial concentration of Man-ganese(Ⅱ) on the adsorption pomelo peel biochar were investigated .The adsorption isotherms and kinetics of pomelo peel for maaganese(Ⅱ) wastewater was also discussed .The results showed that the maximum Manganese (Ⅱ) removal rate was 93 .5% at pH value 6 ,initial concentration of Manganese (Ⅱ) 50 mg/L and biochar dosage 2 g/L .The adsorption result in-dicated that the isothermal adsorption accorded with Langmuir equation and the maximum Manganese (Ⅱ) uptake obtained was Qm=24 .691 mg/g .Adsorption kinetics law conformed to a pseudo -second -order kinetics and the adsorption rate constant was 0 .028 6 g/(mg・min) .%以柚子皮为原料经硫化钠活化后炭化处理制备了生物质炭吸附剂，并将之应用于含锰废水的吸附。考察了溶液pH值、底液质量浓度、生物炭投加量等因素对柚子皮生物炭吸附能力的影响，并研究了柚子皮吸附剂对锰离子废水的吸附平衡和动力学特征。结果表明：柚子皮吸附剂对含锰废水具备较强吸附能力，在溶液pH值为6，底液质量浓度为50 mg／L ，吸附剂投加量为2 g／L的条件下，对锰离子的去除率为93．5％；吸附平衡实验表明该等温吸附过程符合Langmuir方程，饱和吸附量为24．691 mg／g ；吸附动力学研究表明，该吸附过程符合二级动力学方程，吸附速率常数为0．0286 g／（mg・min ）。