碳纳米管对五氯苯酚的吸附性能研究

Absorption of pentachlorophenol on multi-walled carbon nanotubes in methanol system

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r^2=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。

Multi-walled carbon nanotubes,instead of activated carbon,was used as a new adsorptive material to explore the adsorption property about handling the environment organic pollution-pentachlorophenol.Scanning electron microscopy and multi-wavelength UV absorption measurement were used to characterize the corresponding data.The results showed that when the nanotubes were purified by acidification pretreatment,the surface was more smooth and the nanotubes was freed of impurities.farther more,many new ports emerged which made it more advantage for absorbing pentachlorophenol.The nanotubes-pentachlorophenol system had strong UV absorption at the wavelength of 217 nm,255nm and323 nm,respectively.When the concentration of pentachlorophenol was from 0.386mg/L to 4.045mg/L,it presented a good linear relationship which the correlation r^2 was 0.999 at the wavelength 217 nm.The adsorption of nanotubes to pentachlorophenol followed the rules of Freundlich isotherm model well.When the initial concentration increased,the sdsorption increased,but decreased when the temperature rised.