纳米二氧化锰的制备及其对Cd^(2+)的吸附研究  

Preparation of Nano-MnO_2 and Adsorption of Cd^(2+)

作　　者：赵颖[1] 王仁国[1] 曾武[1] 赵茂俊[1] 

机构地区：[1]四川农业大学生命科学与理学院,四川雅安625014

出　　处：《环境科学与技术》2012年第3期112-116,共5页Environmental Science & Technology

摘　　要：采用微乳液还原法,用甲苯还原KMnO4制备了纳米MnO2。采用傅立叶红外光谱(FTIR)、X射线衍射(XRD)、扫描电镜(SEM)等方法对所制纳米MnO2进行了表征。研究表明:所得纳米MnO2为球型颗粒,其粒径范围为50～70 nm,比表面积大,表面存在大量活性-OH基团,高温煅烧使纳米MnO2从无定型向α晶型转变。以水体中Cd2+为目标污染物,通过吸附实验,研究表明溶液pH、煅烧温度、初始浓度对吸附效果有显著影响。pH=6时,300℃煅烧的MnO2吸附Cd2+效果较好,去除率达99.36%。,符合Langmuir模型。Spherical nano-MnO2 was prepared with KMnO4 reduced by toluene in microemulsion. The product was characterized by Fourier transform infrared （FFIR）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Results showed that the nano-MnO2 with sizes range of 50-70 nm possess large specific surface area and lots of active-OH .group. The structures of nano-MnO2 transform from amorphous to ot-MnO2 under high temperature calcination. The adsorption capacity was affected by pH value, calcination temperature and initial concentration. Under the selected conditions of pH 6.0, the adsorption efficiency of Cd^2＋ reaches 99.36% by nan0-MnO2, which was calcined by 300 ℃. The adsorption data fit well in Langmuir isotherm equation.

关 键 词：纳米MNO2 吸附 CD^2+ 

分 类 号：X703[环境科学与工程—环境工程]