碳纳米管吸附还原溴酸盐研究  

Adsorption and reduction of bromate over carbon nanotubes

作　　者：赵玉敏[1] 万海勤[1] 许昭怡[1] Zhao Yumin Wan Haiqin Xu Zhaoyi(State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment, Nanjing University, Nanjing, 210023, China)

机构地区：[1]污染控制与资源化研究国家重点实验室南京大学环境学院,南京210023

出　　处：《南京大学学报（自然科学版）》2017年第2期286-291,共6页Journal of Nanjing University（Natural Science）

基　　金：江苏省自然科学基金(BK2010378)

摘　　要：以单壁碳纳米管(single walled carbon nanotubes,SWCNTs)和多壁碳纳米管(multiwalled carbon nanotubes,MWCNTs)作为原料,经过硝酸处理后分别在800℃、950℃和1100℃下焙烧得到S-800、S-950、S-1100、M-800、M-950和M-1100系列吸附材料.测试其对饮用水中溴酸盐的吸附性能,结果发现反应48h后单壁碳纳米管对0.5mg·L^(-1)、1.0mg·L^(-1)和5.0mg·L^(-1)溴酸盐去除率高于多壁碳纳米管;随着焙烧温度升高,碳纳米管对溴酸盐的去除率显著增强.此外还发现,经过4次循环使用后碳纳米管去除溴酸盐的效率无明显降低.为了探讨碳纳米管对溴酸盐的吸附去除机制,对制备的材料进行了氮气吸脱附Brunauer-Emmett-Teller(BET)、Transmission electron microscopy(TEM)、X-ray diffraction(XRD)、Raman spectroscopy(Raman)、X-ray photoelectron spectroscopy(XPS)、Zeta电位等性质表征.结果发现反应过后碳纳米管表面氧元素含量显著增加,通过不同温度焙烧得到的材料其等电点也有显著差异.A series of single walled carbon nanotubes（SWCNTs）and multiwalled carbon nanotubes（MWCNTs）were prepared via pretreating with nitric acid and calcining at different temperatures,and their performances of bromate removal were tested.The results indicated that SWCNTs displayed higher removal rate than that of MWCNTs,and the bromate removal rate of the adsorbents was dependent on the calcining temperature.Bromate removal rate increased with calcining temperatures.The prepared CNTs were characterized by BET,TEM,XRD,Raman,XPS and Zeta potentials.The XPS results showed that the amount of surface O atoms of the adsorbents was increased after adsorbing bromate.The Zeta potential results indicated that the IEPs of the adsorbents were changed with calcining temperatures.

关 键 词：碳纳米管 溴酸盐 吸附 还原 

分 类 号：X131.2[环境科学与工程—环境科学]