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.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2012年第3期112-116,共5页
Environmental Science & Technology
作者简介
赵颖（1980-），女，讲师，硕士，主要从事环境化学方面的研究，（电子信箱）zhaoying．chem@yahoo．com．cn。
通讯作者，男，教授，（电话）0835-2886179（电子信箱）wangrg60@163．com。
