纳米二氧化锰@还原氧化石墨烯对水中Pb(Ⅱ)的吸附性能与吸附机制研究  

Adsorption performance and mechanism of Pb(Ⅱ)on nano-MnO_(2)@RGO

作　　者：李静[1,2] 鲍东杰 田云阁[1] 鲁秀国[2] 刘占孟[2] Li Jing;Bao Dongjie;Tian Yunge;Lu Xiuguo;Liu Zhangmeng(Xingtai Polytechnic College,Xingtai 054035;School of Civil Engineering and Architecture,East China Jiao Tong University,Nanchang 330013)

机构地区：[1]邢台职业技术学院,邢台054035 [2]华东交通大学土木建筑学院,南昌330013

出　　处：《化工新型材料》2021年第2期195-199,共5页New Chemical Materials

基　　金：国家自然科学基金(51768018和51468016);河北省“三三三”人才培养工程资助经费项目资助(鲍东杰);河北省科技支撑计划项目资助(15273628)。

摘　　要：以重金属Pb(Ⅱ)为目标污染物,制备了MnO_(2)@还原氧化石墨烯(MnO_(2)@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:MnO_(2)@RGO对废水中的Pb(Ⅱ)吸附效果显著,在Pb(Ⅱ)浓度50mg/L,MnO_(2)@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MnO_(2)@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MnO_(2)@RGO吸附剂的X射线衍射图谱中出现了MnO_(2)的特征吸收峰,其附着于RGO表面,印证了MnO_(2)@RGO吸附剂的成功制备。The composite adsorbent of nano-MnO_(2)@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-MnO_(2)@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-MnO_(2)@RGO were better fitted to a pseudo-second-order model,indicating the dominant role of chemisorption.There appeared the characteristic absorption peak of MnO_(2)in the X-ray diffraction spectrum(XRD)of MnO_(2)@RGO,which adhered to the surface of RGO.It can be concluded that the MnO_(2)@RGO was successfully prepared.

关 键 词：二氧化锰@还原氧化石墨烯 重金属 吸附 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]