• 关键词：红土  氧化铁矿物  矿物表面化学，吸附，XPS技术

• 基金项目：国家自然科学基金, 环境地球化学国家重点实验室资助

• 朱立军
• 贵州工业大学资源工程系, 贵阳 550003

• 傅平秋
• 中国科学院地球化学研究所, 贵阳 550002

• 万国江
• 中国科学院地球化学研究所, 贵阳 550002

• 摘要：应用XPS技术，首次较系统地研究了碳酸盐岩红土中氧化铁矿物表面化学特征及其吸附机理。氧化铁矿物表面的XPS分析表明，矿物表面和整体之间在化学成分、状态和结构等方面存在明显差异，矿物表面的这种非均匀性特征是其表面化学反应的重要动力学起因。针铁矿和赤铁矿表面对氟、砷等元素的选择性吸附及其解吸作用是造成红土中氟、砷等元素活化迁移和污染的重要机理.

• Abstract：With X ray photoelectron spectroscopy (XPS) technique, surface chemistry and adsorption mechanism of iron oxide minerals (goethite and hematite) from the laterite developed on carbonate rock have been studied. XPS of the mineral surface reveal an important fact that the chemical properties (including composition, incorporation and structure and so on) between the surface and body of the minerals are highly heterogeneous. The heterogeneous characteristics of the mineral leads to an obvious increase in active energy of surface chemical reaction of minerals and is an important geneses of kinetics of minerals. It is the specific adsorption and desorption of goethite and hematite that lead to mobilization and pollution of F and As and became an important mechanism of the environmental pollution in the laterite.

• Key words：laterite  iron oxide mineral  mineral surface chemistry  adsorption  XPS technique.

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