氧化碳纳米管的水相稳定性及盐引发的沉淀

Aqueous stability of oxidized carbon nanotubes and the precipitation by salts.

作者信息

Peng Xianjia, Jia Jianjun, Gong Xuemin, Luan Zhaokun, Fan Bin

机构信息

State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.

出版信息

J Hazard Mater. 2009 Jun 15;165(1-3):1239-42. doi: 10.1016/j.jhazmat.2008.10.049. Epub 2008 Oct 19.

DOI:10.1016/j.jhazmat.2008.10.049

PMID:19041176

Abstract

The stability of nitric acid oxidized carbon nanotubes (CNTs) and the precipitation of oxidized CNTs in water by salts were investigated. Stability investigation shows that during an aging time of 30 days, oxidized CNTs dispersion shows characteristic UV-vis absorbance peak of individual CNTs at 252 nm and CNTs concentration in the dispersion after 30d aging is 85% of the initial concentration. The precipitation value of salts were measured and the precipitation value follows the order of NaCl>KCl>1/2(MgCl(2))>1/2(CaCl(2))>1/3(FeCl(3))>1/3(AlCl(3)). The nature of anions investigated has little effect on precipitation values of salts.

摘要

研究了硝酸氧化碳纳米管（CNTs）的稳定性以及盐类在水中使氧化碳纳米管沉淀的情况。稳定性研究表明，在30天的老化时间内，氧化碳纳米管分散液在252nm处呈现出单个碳纳米管特有的紫外可见吸收峰，老化30天后分散液中碳纳米管的浓度为初始浓度的85%。测定了盐类的沉淀值，沉淀值顺序为NaCl>KCl>1/2（MgCl₂）>1/2（CaCl₂）>1/3（FeCl₃）>1/3（AlCl₃）。所研究的阴离子性质对盐类的沉淀值影响较小。