矿物—水界面的表面离子化和络合反应模式

doi:10.11867/j.issn.1001-8166.2000.01.0090

地球科学进展 ›› 2000, Vol. 15 ›› Issue (1): 90 -96. doi: 10.11867/j.issn.1001-8166.2000.01.0090

矿物—水界面的表面离子化和络合反应模式

魏俊峰,吴大清

中国科学院广州地球化学研究所,广东广州 510640

收稿日期:1999-02-09 修回日期:1999-04-09 出版日期:2000-02-01
通讯作者: 魏俊峰,男,1965年2月出生,博士生,主要从事矿物表面化学研究。
基金资助:
国家自然科学基金项目“污染沉积物—水界面作用的多样性及其矿物学机制研究”(编号:49773206)和广东省自然科学基金项目“矿物
界面反应动力学及珠江沉积污染物可除性技术研究”(编号:960504)资助。

SURFACE IONIZATION AND SURFACE COMPLEXATION MODELS AT MINERAL/WATER INTERFACE

WEI Junfeng, WU Daqing

Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China

Received:1999-02-09 Revised:1999-04-09 Online:2000-02-01 Published:2000-02-01

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表面络合模式已广泛应用于研究矿物表面吸附和溶解反应,尤其是(氢)氧化物和层状铝硅酸盐矿物。表面官能团是矿物参与表面络合反应的基本单元,(氢)氧化物矿物只具有表面羟基,而层状铝硅酸盐矿物除表面羟基外还具有离子交换位。矿物的表面电荷由永久结构电荷、配位表面电荷和离解表面电荷组成,各种零表面电荷状态可由不同的零电荷点来表征。恒电容模式、双层模式和三层模式是3种最常用的表面络合模式,它们在双电层结构、表面反应(质子化反应和络合反应)、表面电荷与质量平衡方程及应用范围上存在着一些差异。

关键词: 表面络合模式, 矿物—水界面, 表面官能团, 表面电荷

Surface complexation models (SCMs) have been widely used to study mineral surface adsorption and solution, especially for (hydr)oxide and phylloaluminosilicate minerals. Surface functional groups are basic units of surface complexation reactions of minerals. (Hydr)oxide minerals possess surface hydroxyl groups only and phylloaluminosilicate minerals have ion-bearing exchange sites in addition to surface hydroxyl groups. Surface charges on minerals consists of permanent structural charge,coordinative surface charge and dissociated surface charge. A variety of zero surface charge conditions could be presented with different types of points of zero charge. The constant capacitance model (CCM),the double layer model (DLM) and the triple layer model (TLM) are three most commonly used SCMs.Among them, some differences existed in their electrical double layer structures, surface reactions ( protolysis and surface complexation), surface charge and mass balance equations, and range of application.

Key words: Surface complexation model, Mineral/water interface, Surface functional groups, Surface charge.

中图分类号:

P574

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