核桃壳、花生壳和木屑对Pb(Ⅱ)的吸附研究

摘要

In this experiment,agricultural and forestal wastes like walnut shell,peanut shell and sawdust was used to research the adsorption of heavy metal lead and the influence of reaction time,temperature,pH value,adsorbent dosage,original Pb (Ⅱ) concentration and adsorbent modification on the adsorption effect were discussed.The results showed that peanut shell's adsorption of Pb (Ⅱ) is superior to walnut shell and sawdust,and its adsorption rate is 88.1％ at 45 ℃ and pH 6.0 with the initial concentration of Pb(Ⅱ)as 100 mg/L and peanut dosage as 10 g/L,and the reaction time is 240min.After modification,peanut shell's adsorption rate can reach 97.8％.The adsorption of peanut shell,walnut shell and sawdust of Pb (Ⅱ)can all be described with Langmuir equation.%采用农林废弃物核桃壳、花生壳和木屑对重金属铅进行吸附研究.探讨反应时间、温度、pH值、吸附剂用量和初始Pb(Ⅱ)浓度以及吸附剂改性对吸附效果的影响,结果表明,花生壳对Pb(Ⅱ)的吸附效果优于核桃壳和木屑,其在45℃,pH值6.0,Pb(Ⅱ)初始浓度100 mg/L,花生壳投入量10 g/L的条件下反应240 min,其吸附率为88.1％,花生壳改性后的吸附率可达97.8％.花生壳、核桃壳和木屑对Pb(Ⅱ)的吸附均可用Langmuir方程描述.