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采用柱淋溶实验研究了TX100悬浮的多壁纳米碳管在土柱中的淋溶行为及其对菲在土壤中迁移的影响,并用胶体运移的一级动力学对流-弥散模型对纳米碳管在土柱中的迁移能力进行了估算.实验结果表明,在砂土和粉砂壤土中分别有83.5%和73.4%的多壁纳米碳管能够穿透土柱,模型估算的最远迁移距离均大于200cm,说明多壁纳米碳管有向深层土壤迁移的可能性.多壁纳米碳管的存在显著促进了菲在土壤中的迁移能力.在砂土中,多壁纳米碳管结合态菲是菲迁移的主要形态,而在粉砂壤土中多壁纳米碳管结合态菲是菲迁移的唯一形态.在迁移过程中,菲能够从多壁纳米碳管上不同程度地解吸,解吸的比率与土壤对菲的吸附亲和力有关,土壤对菲的吸附亲和力越高,菲从多壁纳米碳管上解吸的比率越大.
The column leaching experiment was used to study the leaching behavior of TX100 suspended multi-walled carbon nanotubes in soil column and its effect on the migration of phenanthrene in the soil. The first-order kinetic convection-dispersion model The results show that 83.5% and 73.4% of multi-walled carbon nanotubes can penetrate the soil column in sand and silty loam, respectively, and the farthest migration distance estimated by the model Are greater than 200cm, indicating that multi-walled carbon nanotubes have the potential to migrate to the deep soil.The presence of multi-walled carbon nanotubes significantly promoted the migration of phenanthrene in the soil.In the sand, multi-walled carbon nanotubes bonded phenanthrene Is the main form of phenanthrene migration, while the multi-walled carbon nanotube-bound phenanthrene is the only form of phenanthrene migration in silty loam.During the migration process, phenanthrene can be desorbed and desorbed to varying degrees from multiwalled carbon nanotubes It is related to the adsorption affinity of the soil to phenanthrene, the higher the adsorption affinity of the soil to phenanthrene, the greater the rate of phenanthrene desorption from the multi-walled carbon nanotubes.