坡缕石的孔道结构及其环境矿物学意义  

TUNNEL STRUCTURE OF PALYGORSKITE AND ITS ENVIRONMENTAL MINERALOGICAL SIGNIFICANCE

作　　者：周金虹[1] 陆现彩[1] ZHOU Jinhong;LU Xiancai(Frontiers Science Center for Critical Earth Material Cycling,School of Earth Sciences and Engineering,Nanjing University,Nanjing,210093)

机构地区：[1]关键地球物质循环教育部前沿科学中心,南京大学地球科学与工程学院,江苏南京210093

出　　处：《矿物岩石》2025年第1期24-30,共7页Mineralogy and Petrology

基　　金：国家自然科学基金项目(批准号:42172050)。

摘　　要：坡缕石是一种特殊的具有一维孔道结构的富镁铝纤维状黏土矿物,具有比表面积大、吸附性能好的特性,广泛应用于重金属污染和有机污染的环境治理,是重要的环境友好矿物材料。由于天然坡缕石,通常晶体细小、结晶程度差、晶体化学多样,实验技术的限制使得对其晶体结构的研究进展较为缓慢,尤其是坡缕石孔道内部结构及其纳米限域效应认识不足。本文初步总结了关于坡缕石孔道结构研究的实验和分子模拟研究的进展,系统介绍了坡缕石孔道水的主要类型和沸石水的分布规律和活动性,对比了实验和分子模拟的结果,发现坡缕石中的沸石水有相对稳定的分布位点,其中结构层间为中性的孔道沸石水有两个分布位置,而结构层间带电荷的孔道沸石水只有一个位置。通过对孔道内离子和水分子活动性的分析以及横向对比发现,坡缕石对孔道内分子和离子活动有明显的约束能力。在这些认识的基础上,本文进一步探讨了坡缕石孔道结构的环境矿物学意义。Palygorskite is a special magnesium-rich aluminum fibrous clay mineral with a one-dimensional channel structure,characterized by large specific surface area and good adsorption properties.It is widely applied in environmental remediation of heavy metal pollution and organic contamination and therefore,is an important environmentally friendly mineral material.Due to the fine crystals,poor crystallinity and chemical diversity of natural palygorskite,as well as the limitations of experimental techniques,research on its crystal structure has progressed slowly,particularly in terms of understanding the internal structure of the palygorskite channels and its nanoconfinement effects.This paper focus on the summarization of progress in experimental and molecular simulation studies of the palygorskite channel structure.It is realized that,after decades of experimental research,a consensus has been reached regarding the channel structure characteristics of palygorskite,especially with more new insights into the distribution of structures within the channels and the distribution of water molecules.Comparing experimental and molecular simulation studies,this paper systematically introduces the main types of water in palygorskite channels and the distribution and activity patterns of zeolite water.The results show that the zeolite water in palygorskite has relatively stable distribution sites.Among these,the neutral channel zeolite water in the interlayer structure has two distribution locations,while the charged channel zeolite water in the interlayer structure has only one location.Through the analysis of the activity of ions and water molecules within the channels and lateral comparisons,it is found that palygorskite has a significant ability to constrain the activity of molecules and ions within the channels.Based on these insights,this paper further explores the environmental mineralogical significance of the palygorskite channel structure.

关 键 词：坡缕石 孔道结构 孔道水 环境矿物学 

分 类 号：P578[天文地球—矿物学]