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首页> 外文期刊>Environmental Science & Technology >Clay Minerals Affect the Stability of Surfactant-Facilitated Carbon Nanotube Suspensions
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Clay Minerals Affect the Stability of Surfactant-Facilitated Carbon Nanotube Suspensions

机译：粘土矿物影响表面活性剂促进的碳纳米管悬浮液的稳定性

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Carbon nanotubes (CNTs), because of their wide application, will inevitably enter aquatic systems, but the fate and transport of their suspensions in the environment are largely unknown. Clay minerals are expected to interact with CNT suspensions, affecting their fate and bioavailability. This study investigated the influence of clay minerals (kaolinite and montmorillonite) on the stability of surfactant (SDBS, CTAB, and TX100) facilitated multiwalled CNT (MWCNT) suspensions. Adsorption of the surfactants by MWCNTs and clay minerals was also examined. This is a first study on the interaction between clay minerals and surfactant-CNT suspensions. Sorption of SDBS by clay minerals and MWCNTs followed the order MWCNTs montmorillonite ≈ kaolinite; but sorption of CTAB and TX100 followed the order montmorillonite > MWCNTs > kaolinite. For SDBS suspended MWCNTs, introduction of montmorillonite and kaolinite could not change their stability; for CTAB suspended MWCNTs, both montmorillonite and kaolinite greatly deposited the suspended MWCNTs; for TX100 suspended MWCNTs, montmorillonite could partially deposit the suspended MWCNTs, whereas kaolinite showed minimal effect. Two mechanisms of clay minerals affecting MWCNT suspensions are (1) removal of surfactants by clay minerals from solution and MWCNT surface and (2) bridging between clay mineral and MWCNTs by surfactant.
机译：碳纳米管（CNTs）由于其用途广泛，将不可避免地进入水生系统，但是其悬浮物在环境中的命运和运输在很大程度上是未知的。预计粘土矿物会与CNT悬浮液相互作用，从而影响其命运和生物利用度。这项研究调查了粘土矿物（高岭石和蒙脱石）对表面活性剂（SDBS，CTAB和TX100）促进的多壁CNT（MWCNT）悬浮液稳定性的影响。还检查了多壁碳纳米管和粘土矿物对表面活性剂的吸附。这是关于粘土矿物与表面活性剂-CNT悬浮液之间相互作用的首次研究。粘土矿物和多壁碳纳米管对SDBS的吸附顺序为：多壁碳纳米管蒙脱石≈高岭石；但是CTAB和TX100的吸附顺序是蒙脱石> MWCNTs>高岭石。对于SDBS悬浮的MWCNT，引入蒙脱石和高岭石不会改变它们的稳定性。对于CTAB悬浮的多壁碳纳米管，蒙脱石和高岭石都大量沉积了悬浮的多壁碳纳米管。对于TX100悬浮的MWCNT，蒙脱石可以部分沉积悬浮的MWCNT，而高岭土的影响最小。粘土矿物影响MWCNT悬浮液的两种机理是：（1）通过粘土矿物从溶液和MWCNT表面去除表面活性剂；（2）通过表面活性剂在粘土矿物和MWCNT之间架桥。

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