Collaborative Research: The Palygorskite-Sepiolite to Smectite Transformation and the Influence on Reactive Surface Sites

合作研究：坡缕石-海泡石向蒙皂石的转变及其对反应表面位点的影响

• 批准号: 0001122
• 负责人: Stephen Guggenheim
• 金额: $ 12.8万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001122&HistoricalAwards=false
• 关键词: Collaborative; Research; Palygorskite; Sepiolite; Smectite

GuggenheimEAR-0001122The presence of palygorskite and sepiolite in soils and sediments is widely used as a paleoenvironmental indicator because of their restricted environments of formation. In addition, their physical properties (especially their sorption capacity and catalytic behavior) has lead to their extensive industrial and environmental use as sorbants. The physiochemical transformation of palygorskite-sepiolite to smectite has been identified in samples from the Meigs-Attapulgas-Quincy district, an important source of these clays. Because this transformation can considerably affect the use of the palygorskite-sepiolite as industrial sorbants, the proposed project investigates the palygorskite-sepiolite to smectite transformation and its influence on the type and distribution of reactive surface sites and changes in micro-fabrics. The micro-fabric, morphology, and surface micro-topography of a natural palygorskite-sepiolite-smectite assemblage from the Meigs-Attapulgas-Quincy district will be studied using transmission electron microscopy (TEM) and atomic force microscopy (AFM), and the bulk structure of palygorskite-sepiolite will be studied using synchrotron X-ray diffraction and TEM data. Atomic models of the bulk and surface structures of palygorskite, sepiolite, and especially transitional forms will be developed from the TEM, X-ray, and AFM data. The purpose of this study is to obtain a step-by-step understanding of the transformation and to model the variation in sorption behavior. The results are important for environmental (e.g., heavy-metal adsorption) and commercial applications (e.g., bleaching and clarifying agents of oils) as well as the potential ability to use altered lithofacies to indicate paleoenvironmental information.

Guggenheimear-0001122土壤和沉积物中存在质子石和sepiolite的存在，因为它们的地层环境受限，因此被广泛用作古环境指标。此外，它们的物理特性（尤其是它们的吸附能力和催化行为）导致了它们作为香火的广泛工业和环境用途。 在Meigs-Attapulgas-Quincy区的样品中已经鉴定出了质子石 - 泥石石到蒙奇石的理化学转化，这些粘土是这些粘土的重要来源。 由于这种转化可以极大地影响丙叶高岩 - 隔离石作为工业香火，因此拟议的项目调查了质晶岩 - 隔离石对晶状体转化及其对反应性表面位点的类型和分布以及微型福率变化的影响。 The micro-fabric, morphology, and surface micro-topography of a natural palygorskite-sepiolite-smectite assemblage from the Meigs-Attapulgas-Quincy district will be studied using transmission electron microscopy (TEM) and atomic force microscopy (AFM), and the bulk structure of palygorskite-sepiolite will be studied using synchrotron X-ray diffraction and TEM 数据。 TEM，X射线和AFM数据将开发出质子石，sepiolite，尤其是过渡形式的块状和表面结构的原子模型。这项研究的目的是逐步了解转化并建模吸附行为的变化。 结果对于环境（例如，重金属吸附）和商业应用（例如，石油的漂白和澄清剂）以及使用改变岩相的潜在能力来指示古环境信息的潜在能力很重要。