【摘要】 以重金属Pb（Ⅱ）为目标污染物,制备了MnO₂@还原氧化石墨烯（MnO₂@RGO）复合吸附剂。考察了吸附剂投加量、溶液pH、初始浓度和反应温度等因素对Pb（Ⅱ）去除效果的影响。结果表明:MnO₂@RGO对废水中的Pb（Ⅱ）吸附效果显著,在Pb（Ⅱ）浓度50mg/L,MnO₂@RGO投加量0.15g/L,pH为6.0,吸附时间3h的条件下,吸附量可达到124.3mg/g,Pb（Ⅱ）去除率可达到75%。纳米MnO₂@RGO可用Langmiur等温模型和伪二级动力学方程来描述,为单分子层吸附,以化学吸附为主。在MnO₂@RGO吸附剂的X射线衍射图谱中出现了MnO₂的特征吸收峰,其附着于RGO表面,印证了MnO₂@RGO吸附剂的成功制备。更多还原

【Abstract】 The composite adsorbent of nano-MnO₂@graphene（RGO）was prepared,and introduced to remove Pb（Ⅱ）in water.The effects of various factors,including adsorbent dosage,initial ion concentration,pH,and temperature were evaluated.Under the condition of 50 mg/L Pb（Ⅱ）ion concentration,0.15 g/L nano-MnO₂@RGO,pH 6.0,and 3 hadsorption time,the removal efficiency of Pb（Ⅱ）ion reached 75% and the adsorption capacity of them reached 124.3 mg/g.The adsorption data from our experiments fitted the Langmuir isotherm,and the adsorption kinetics data for nano-MnO₂@RGO were better fitted to a pseudo-second-order model,indicating the dominant role of chemisorption.There appeared the characteristic absorption peak of MnO₂ in the X-ray diffraction spectrum（XRD）of MnO₂@RGO,which adhered to the surface of RGO.It can be concluded that the MnO₂ @ RGO was successfully prepared.更多还原