| 孟庆涛,周时,姜延吉,殷宪强.黏土矿物胶体对氧化石墨烯和As（Ⅴ）在多孔介质中迁移的影响[J].农业环境科学学报,2020,39(8):1683-1691. |
| 黏土矿物胶体对氧化石墨烯和As（Ⅴ）在多孔介质中迁移的影响 |
| Effects of clay mineral colloids on the transport of graphene oxide and As（Ⅴ）in porous media |
| 投稿时间：2020-03-25 |
| DOI：10.11654/jaes.2020-0336 |
| 中文关键词: 氧化石墨烯 高岭石 蒙脱石 As（Ⅴ） 迁移 |
| 英文关键词: graphene oxide kaolinite montmorillonite As(Ⅴ) transport |
| 基金项目:国家重点研发计划项目（2018YFC1800600）；国家自然科学基金面上项目（41877018，41771260）；陕西省重点研发项目（2018ZDXM-SF-030，2017SF-377） |
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| 中文摘要: |
| 为探究不移动的黏土矿物胶体对氧化石墨烯与砷在多孔介质中迁移的作用，通过一系列柱试验研究了氧化石墨烯（GO）、As（Ⅴ）和GO-As（Ⅴ）混合液在不同黏土矿物胶体（高岭石胶体和蒙脱石胶体）、pH、离子强度（IS）和流速下的迁移行为。结果表明，流速的增大会增加GO和As（Ⅴ）在饱和多孔介质中的迁移率；离子强度的增加降低了GO和As（Ⅴ）在饱和多孔介质中的迁移率；增加pH也会增加GO和As（Ⅴ）在饱和多孔介质中的迁移率。此外，相比单独迁移，GO-As（Ⅴ）协同迁移中GO和As（Ⅴ）的迁移率均有增加。不移动的蒙脱石胶体相比于高岭石胶体对GO和As（Ⅴ）的阻滞能力更强，可能是蒙脱石层间存在的阳离子提供了较高岭石更多的正电荷。 |
| 英文摘要: |
| To investigate the role of immobile clay mineral colloids on the migration of graphene oxide(GO)and arsenic in porous media, a series of column experiments were conducted to study the migration behavior of GO, As(Ⅴ), and GO-As(Ⅴ)through different clay mineral colloids(kaolinite and montmorillonite), as well as their pH, ionic strength(IS), and flow rate. The results show that increasing the flow rate will increase the mobility of GO and As(Ⅴ)in saturated porous media; increasing the IS will decrease the mobility of GO and As(Ⅴ)in saturated porous media; and increasing pH will also increase the mobility of GO and As(Ⅴ)in the same. In addition, the mobility of both GO and As(Ⅴ)increased when their movements were coordinated, compared to individual movements. Immovable montmorillonite colloids have a greater ability to block GO and As(Ⅴ)than compared with kaolinite colloids. The reason may be that the presence of cations in the montmorillonite layers provide a greater positive charge. This study clarifies the effect of clay minerals on the fate of GO and As (Ⅴ)in soil. |
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