我们使用分子的动力学模拟学习涉及水的 uranyl 种类的吸附的机制(\({\text { UO }}_{ 2 }^{ 2 +}\)) 到泥土矿物质的基础表面包括 kaolinite,叶卉石和 montmorillonite。也就是, Uranyl 离子能与碳酸盐形成各种各样的建筑群[ UO <潜水艇class=“ a-plus-plus ”> 2 (H 2 O )<潜水艇class=“ a-plus-plus ”> 5 ]2+,[ UO <潜水艇class=“ a-plus-plus ”> 2 (H 2 O )<潜水艇class=“ a-plus-plus ”> 3 (CO 3 )],[ UO <潜水艇class= a-plus-plus > 2 (H 2 O )<潜水艇class= a-plus-plus > 2 (CO 3 ) 2 <模拟证明在水的泥土接口, uranyl 种类和表面类型控制吸附模式。noncarbonato 和 monocarbonato uranyl 种类能通过静电的相互作用在 siloxane 表面上形成外部范围的建筑群,但是 dicarbonato 和 tricarbonato uranyl 建筑群很少在 siloxane 表面上吸附。gibbsite 表面上的 uranyl 碳酸盐建筑群的强壮的外部范围的吸附被观察,它被在 ligands 之间的氢契约修理(碳酸盐或 H < 潜水艇 class= “ a-plus-plus ” > 2 O ) 并且表面氢氧根。在这研究导出的吸着行为提供新卓见进理解铀和另外的放射性核种的迁居和丰富。
We use molecular dynamics simulation to study the mechanisms involved in the adsorption of aqueous uranyl species(UO2^2+) to the basal surfaces of clay minerals,including kaolinite,pyrophyllite and montmorillonite.Uranyl ion can form various complexes with carbonates,namely,[UO2(H2O)5]^2+,[UO2(H2O)3(CO3)],[UO2(H2O)2(CO3)2]^2-,[UO2(CO3)3]^4-.The simulations show that at aqueous clay interfaces,both uranyl species and surface type control the adsorption pattern.The noncarbonato and monocarbonato uranyl species can form outer-sphere complexes on siloxane surfaces through electrostatic interaction,but the dicarbonato and tricarbonato uranyl complexes rarely adsorb on the siloxane surfaces.Strong outer-sphere adsorptions of the uranylcarbonate complexes on gibbsite surfaces are observed,which are fixed by hydrogen bonds between the ligands(carbonate and/or H2O) and surface hydroxyls.The sorption behaviors derived in this study provide new insights into understanding the migration and enrichment of uranium and other radionuclides.