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研究了多壁碳纳米管水分散体系的紫外光谱特征及其影响因素,并将其应用于碳纳米管对环境污染物五氯苯酚的吸附过程。结果表明:水分散多壁碳纳米管的主吸收带在190~250nm;最大吸收峰位于190~207nm,且随碳纳米管管外径的增加向短波方向偏移;抽滤次数n影响水分散体系中碳纳米管的浓度及其紫外光谱强度,n≥4时吸收强度趋于稳定低值。紫外光谱法研究碳纳米管吸附五氯苯酚的体系中,选用232nm作为测定波长可得到良好的线性关系且避免碳纳米管背景浓度的干扰。
The UV spectra of multi-walled carbon nanotubes (MWNTs) aqueous dispersions and their influencing factors were studied and applied to the adsorption of PCP onto PCP. The results show that the main absorption band of water-dispersed multi-walled carbon nanotubes is in the range of 190-250 nm and the maximum absorption peak is in the range of 190-277 nm, which shifts to the short wave direction with the increase of the outer diameter of the carbon nanotube tube. The concentration of the carbon nanotubes in the system and the intensity of the ultraviolet spectrum thereof, when n≥4, the absorption intensity tends to be stable and low. UV spectroscopy method for the adsorption of PCP on carbon nanotubes system, the choice of 232nm as the determination of wavelength can be a good linear relationship and to avoid the interference of the background concentration of carbon nanotubes.