改性橘子皮对重金属铅离子的吸附性能研究

Study on adsorption of heavy metal lead ions by modified orange peel

以橘子皮、碱性氧化橘子皮的吸附废水中Pb^2+,研究吸附剂投加量、pH、吸附时间等对Pb 2+去除率的影响吸附。结果表明,在初始离子浓度50 mg/L,投加量为1.0 g/L,pH 5.5,温度30℃,吸附时间2 h时,碱性氧化改性的橘子皮比普通橘子皮对Pb 2+的吸附效果更佳,去除率达到98.52%。准二级动力学方程和Langmuir吸附等温模型更加符合吸附过程。吸附过程是单分子层吸附,以化学吸附为主。

The adsorption of Pb^2+ in wastewater from orange peel and alkaline oxidized orange peel was conducted to study the effects of adsorbent dosage,pH and adsorption time on the removal rate of Pb^2+ .The results showed that at the initial ion concentration of 50 mg/L,dosage of 1.0 g/L,pH 5.5,temperature of 30 ℃ and adsorption time of 2 h,the adsorption effect of alkaline oxidation modified orange peel on Pb 2+ was better than that of ordinary orange peel,and the removal rate reached 98.52%.The quasi-second order kinetic equation and Langmuir adsorption isothermal model are more suitable for the adsorption process.The adsorption process is single molecular layer adsorption,mainly chemical adsorption.