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碳纳米材料是当前环境领域关注的热点之一.本研究以菲为模型污染物,以Tenax TA树脂为助解吸剂,研究了菲在4种碳纳米管上的非生物解吸动力学以及碳纳米管理化性质对菲解吸的影响机理.结果表明,当老化60d,碳纳米管上菲初始吸附量为578mg·kg-1时,解吸30d后菲累积解吸量随时间变化不明显,解吸35d后碳纳米管上菲的解吸率为14.28%～50.71%,因此菲在碳纳米管上存在不可逆迟滞解吸效应.菲在碳纳米管上的解吸符合三相一级解吸动力模型,包括快解吸、慢解吸以及极慢解吸三部分,其中快解吸部分所占比例较小(1%～3%),慢解吸部分(16%～54%)和极慢解吸部分(43%～83%)所占比例相对较大,4种碳纳米管上菲累积解吸量与慢解吸部分呈显著正相关(p<0.01);菲累积解吸量与碳纳米管比表面积和中孔孔容呈显著负相关(p<0.05),与碳纳米管粒径呈显著正相关(p<0.05).本研究表明比表面积较大的碳纳米管能显著降低环境中有机污染物的生物有效性.
Carbon nanomaterials are one of the hot topics in the field of current environment.In this study, phenanthrene was used as a model pollutant and Tenax TA resin was used as a desorbent to study the non-biological desorption kinetics of phenanthrene on four kinds of carbon nanotubes, The results showed that when the initial sorption amount of carbon nanotubes on the carbon nanotubes was 578 mg · kg-1 after 60 days of aging, the cumulative desorption capacity of phenanthrene did not change with time after 30 days of desorption, and after 35 days of desorption The desorption rate of phenanthrene on carbon nanotubes is about 14.28% ~ 50.71%, and the adsorption of phenanthrene on carbon nanotubes is in accordance with the three-phase desorption kinetic model including fast desorption and slow desorption (1% ~ 3%), slow desorption (16% ~ 54%) and very slow desorption (43% ~ 83%) relative to the proportion of slow desorption (P <0.01). There was a significant negative correlation between the cumulative desorption amount of phenanthrene and the specific surface area of carbon nanotubes and the pore volume of mesopores (p <0.05 ), Which was significantly and positively correlated with the diameter of carbon nanotubes (p <0.05) .This study shows that the specific surface area Carbon nanotubes can significantly reduce the bioavailability of organic pollutants in the environment.