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研究了多壁碳纳米管对难降解的多氯代有机产物-五氯苯酚的吸附特性,并采用电子扫描电镜、多波长紫外吸收测量仪对其进行了表征分析。结果表明,碳纳米管经酸化纯化预处理后,表面光滑无杂质,出现许多新端口,大大地提高了其对五氯苯酚(PCP)的吸附效果;碳纳米管对PCP在波长为217、255、323nm处都有强紫外吸收;在λ=217nm处,PCP甲醇溶液浓度与吸光度值之间具有良好的线性关系,相关度r2=0.9999,线性范围为0.386~4.045mg/L。多壁碳纳米管对PCP的吸附符合Freundlich吸附等温模型,随着初始浓度增加,吸附量增加,随着温度升高,吸附量降低。
The adsorption properties of multi-walled carbon nanotubes (CNTs), which are refractory polychlorinated organic products, were investigated. Their electronic properties were characterized by scanning electron microscopy (SEM) and multi-wavelength UV absorption spectrometer. The results showed that the carbon nanotubes pretreated by acidification had a smooth surface without impurities and many new ports appeared, which greatly enhanced their adsorption effect on PCP. The effect of carbon nanotubes on PCP at 217, 255 And 323 nm respectively. There was a good linear relationship between the concentration of PCP and absorbance at λ = 217 nm. The correlation coefficient r2 was 0.9999 and the linear range was 0.386-4.045 mg / L. Adsorption of PCP by multiwalled carbon nanotubes conforms to the Freundlich adsorption isothermal model. With the increase of the initial concentration, the adsorption capacity increases and the adsorption capacity decreases with the increase of temperature.