盱眙、明光、临泽坡缕石的八面体阳离子占位及对其性能的影响
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1.中国地质大学(北京);2.中国地质大学(北京)

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国家自然科学基金项目(重点项目)


LIAO Libing* 1), ZHANG Peijun1), LIU Hao2)1 School of Materials Science and Engineering, China University of Geosciences (Beijing), Beijing 100083, China
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china university of geosciences(Beijing)

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    摘要:

    坡缕石是一种2:1型链层状结构含水富镁铝硅酸盐矿物,具有重要的资源和材料属性。不同成因、产状坡缕石八面体中类质同象替代有很大差别,而八面体类质同象替代对坡缕石性能的影响未见研究报导。本文以中国最具代表性的安徽明光、江苏盱眙、甘肃临泽坡缕石为研究对象,研究了三种坡缕石的Al、Mg、Fe含量及在八面体中的占位,并探讨了八面体的Al、Mg、Fe占位对坡缕石中水的种类和含量、表面电位和酸位以及对Pb2+、Cd2+吸附性能的影响。结果表明,明光坡缕石相对富镁,八面体主要被Mg2+占据,具有三八面体特征;盱眙、临泽坡缕石相对富铝、铁,八面体主要被Al3+占据,表现出更多的二八面体特征。盱眙坡缕石由于M1位置空位较多,结构水含量较低;坡缕石类质同象替代对Zeta电位影响不大;具有二八面体特征的盱眙、临泽坡缕石由于八面体中Al含量较高,酸位较多,催化性能较好。在重金属吸附实验中,明光坡缕石对Cd2+的吸附效果最好,盱眙坡缕石对Pb2+的吸附效果最好,临泽坡缕石吸附性能较差。本文可为坡缕石的改性和应用提供指导和参考。

    Abstract:

    Palygorskite is a 2:1 type chain-layered structure hydrated magnesium aluminosilicate mineral with important resource and material attributes. The isomorphic substitution in the octahedron of palygorskite varies greatly with different genesis and occurrence, but the influence of isomorphic substitution in the octahedron on properties of palygorskite has not been reported. In this work, three representative palygorskites from Anhui Mingguang, Jiangsu Xuyi and Gansu Linze in China were taken as the research objects. The contents and octahedral occupation of Al, Mg and Fe of the three palygorskites were studied, and the effects of the octahedral occupation of Al, Mg and Fe on the types and contents of water, surface potential and acid sites, and the adsorption capacity for Pb2+ and Cd2+ of palygorskite were discussed. The results showed that Mingguang palygorskite was relatively rich in magnesium, while Xuyi and Linze palygorskites were relatively rich in aluminum and iron. The octahedra of Mingguang palygorskite was mainly occupied by Mg2+, showing three-octahedron characteristics; the octahedra of Xuyi palygorskite had relatively more Al3+, showing more two-octahedron characteristics; Linze palygorskite also showed two-octahedron characteristics, and the cation occupation was similar to that of Xuyi palygorskite. Due to the large number of vacancies at M1, Xuyi palygorskite had lower structural water content; isomorphic substitution of palygorskite had little effect on Zeta potential; Xuyi and Linze palygorskites with two-octahedron characteristics had higher Al content in octahedra, more acid sites, and better catalytic performance. In the heavy metal adsorption experiment, Mingguang palygorskite had the largest adsorption capacity for Cd2+, Xuyi palygorskite had the largest adsorption capacity for Pb2+, and Linze palygorskite had poor adsorption performance. This work can provide guidance and reference for the modification and application of palygorskite.

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  • 收稿日期:2023-08-14
  • 最后修改日期:2023-10-04
  • 录用日期:2023-10-07
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