摘要
采用液相氧化还原法制备二氧化锰/多壁碳纳米管(MnO2/MWNTs)复合材料,利用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、激光粒度仪和N2吸附-脱附对改性前后MWNTs的物化性能进行表征.通过对水中Sb(Ⅲ)的静态吸附试验考察改性碳纳米管的吸附容量,同时还考察pH值、锑的初始浓度、吸附剂投加量、吸附时间和温度对吸附效果的影响.结果表明,在Sb(Ⅲ)初始浓度为1.5mg/L、吸附剂投加量为0.5g/L、温度为298K、pH值为2.00的条件下,二氧化锰改性后的碳纳米管对锑的去除率可达到97.72%,比未改性碳纳米管的去除率提高51.29%,吸附容量也从原始CNT的3.01mg/g增大到6.00mg/g.最后发现该吸附过程较好地符合Freundlich吸附等温线,pH值对吸附效果的影响较大.
A novel kind of manganese dioxide supported on multiwalled carbon nanotubes (MnO2/ MWNTs) was prepared by Liquid redox method for Sb(III) removal. The MnO2 modified CNTs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron mi- croscopy (TEM), laser particle size analyzer and N2 adsorption-desorption. The static adsorption study was carried out and parameters affecting the adsorption efficiencies including solution pH value, initial Sb (III) concentration, adsorbent dosage, contact time and temperature were investigated. The results indi- cate that the removal rate of Sb(III) by MnO2 modified CNTs is 97.72% under the initial Sb(III) concen- tration of 1.5 mg/L, adsorbents dosage of 0.5 g/L, temperature of 298 K, and pH value of 2.00, which is 51.29% higher than that of the raw CNTs. The adsorption capacity correspondingly increases from 3.01 mg/g to 6.00 mg/g. The equilibrium adsorption data can be fitted to the Freundlich adsorption isotherm. In addition, it has been found that the pH values have great impacts on the adsorption efficiency.
出处
《浙江大学学报(工学版)》
EI
CAS
CSCD
北大核心
2013年第11期1951-1957,1964,共8页
Journal of Zhejiang University:Engineering Science
基金
国家水体污染控制与治理科技重大专项资助项目(2009ZX07423-004
2008ZX07421-006)
关键词
碳纳米管
二氧化锰
吸附
Sb(m)
Carbon nanotubes
Manganese dioxide
Adsorption
Sb(III)