多壁碳纳米管的对氨基苯磺酸钠修饰及对Cu^(2+)的吸附性能

Modification of carbon nanotubes with sodium p-aminobenzenesulfonate and its effect on Cu^(2+) adsorption

通过在多壁碳纳米管(MWCNTs)表面氧化出羧基,将羧基转化为酰氯,然后将对氨基苯磺酸钠与MWCNTs表面的酰氯发生酰胺化反应,制备了对氨基苯磺酸钠接枝的水溶性多壁碳纳米管(MWCNT-C6H5SO3Na)。红外光谱研究表明,对氨基苯磺酸钠以共价键方式接枝到MWCNTs表面;热重分析表明对氨基苯磺酸钠在MWCNTs表面的质量分数达到29.9%。MWCNT-C6H5SO3Na具有良好的水溶性及分散性。吸附性能测试结果表明,MWCNT-C6H5SO3Na对Cu2+的吸附性能较MWCNTs原粉有了显著的提高,吸附等温线符合Freundlich等温吸附方程。

Multiwalled carbon nanotubes （MWCNTs） were oxidized by concentrate HNO3 and then reacted with SOCl2 to form MWCNT-COC1. Water-soluble sodium p-aminobenzenesulfonate-grafted multiwalled carbon nanotubes （ MWCNT-CO- NHC6H5SO3Na） were synthesized by an amidation reaction of sodium p-aminobenzenesulfonate with MWCNT-COC1, which was verified by FT-IR spectroscopy. The content of the sodium p-aminobenzenesulfonate grafted onto the MWCNT surface reached 29. 9 mass%. The MWCNT-CO-NI-IC6H5SO3Na showed a good solubility and dispersion in water, and had an improved adsorptive performance for the removal of low concentrations of Cu2＋in water. The adsorption isotherms of the MWCNT-CO-NHC6H5SO3Na for Cu2＋ can be well fitted by the Freundlich equation.