摘要
采用木质纤维素与蒙脱土经插层复合反应,成功的合成了一种新型吸附剂木质纤维素/蒙脱土纳米复合材料(LNC/MMT),研究了其对水中Cd(Ⅱ)的吸附行为以及影响吸附效果的重要因素,利用X射线衍射(XRD)和扫描电镜(SEM)分析方法对纳米复合材料的结构进行表征,通过动力学、热力学模型拟合探讨其吸附机理。结果表明,木质纤维素/蒙脱土纳米复合材料对水中Cd(Ⅱ)具有很好的吸附效果,在Cd(Ⅱ)溶液初始浓度0.005 mol/L、p H值5.6、吸附温度55℃、吸附时间80 min时,吸附容量达到最大值118.45 mg/g。吸附动力学可以用准二级动力学方程描述;等温吸附模型符合Langmuir方程,木质纤维素/蒙脱土吸附Cd(Ⅱ)主要是单分子层化学吸附。
A new adsorbent - lignocetlulose/montmorillonite （LNC/MMT） nanocomposite was synthesized by the chemical interca- lation process of lignocellulose and montmorillonite. Effects of initial concentration of Cd （Ⅱ） ion, solution pH, adsorption tempera- ture and adsorption time on Cd （Ⅱ） adsorption capacity were studied. The structure of LNC/MMT was characterized with X - ray dif- fraction （XRD） and scanning electron microscope （SEM）, adsorption mechanism was investigated by kinetic and isotherm model sim- ulation. The results showed that the LNC/MMT nanocomposite has a good potential as a Cd （Ⅱ） adsorbent, The equilibrium adsorp- tion capacity could reach 118.45 mg/g under the optimal condition, i.e. , 0.005 mol/L initial concentration of Cd （Ⅱ） ion, 5.6 of the solution pH value, 55℃ of the adsorption temperature and 80 min of the adsorption time. The adsorption dynamics could be well described with pseudo - second order kinetic equation and the adsorption equilibrium fits Langmuir equation, it was inferred that the main adsorption process was monolayer chemical adsorption.
出处
《内蒙古农业大学学报（自然科学版）》
CAS
北大核心
2014年第5期122-129,共8页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
国家林业局公益性行业科研专项经费(201104004)
内蒙古农业大学基础学科科研启动基金项目(JC2012004)
