南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (2): 286.
赵玉敏,万海勤*,许昭怡
Zhao Yumin,Wan Haiqin*,Xu Zhaoyi
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48 h后单壁碳纳米管对0.5 mg·L-1、1.0 mg·L-1和5.0 mg·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.
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