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Surface charge characteristics of hydroxyaluminosilicate-clay complexes and reactivity with organic ligands

羟基铝硅酸盐-粘土配合物的表面电荷特征及其与有机配体的反应性

基本信息

批准号：
03660059
负责人：
INOUE Katsuhiro
金额：
$ 1.28万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The electric charge and surface characteristics of vermiculite or montmorillonite complexes with hydroxy-Al (HA) of hydroxyaluminosilicate (HAS) ions were studied in the pH range of 4 to 8. At pH 4 to 6, the negative charge of vermiculite or montmorillonite was drastically reduced by interlayer formation with HA or HAS ions. At pH 7 to 8, the magnitude of negative charge of these complexes was close to that of montmorillonite or vermiculite, suggesting that HAS or HA ions were excluded from the interlayer spaces of these clays. A significant positive charge was developed on HAS-montmorillonite complexes formed at NaOH/Al molar ratios of 2.0 and 2.5. The fixation of HAS or HA ions on montmorillonite or vermiculite caused significant reduction in total and internal surface areas but a slight increase in external surface area.Hydroxyaluminosilicate-clay complexes fixed a significant amount of phosphate on the interlayer and planar surfaces of these clays by ligand exchange. However, the complextion of HAS ions with vermiculite caused the significant reduction of K fixation.These data suggest that HAS and HA ions fixed on expansible 2:1 layer silicates contribute as active Al components to humus accumulation and phosphate retention in acidic and nonallophanic Andisols and related soils. Our data also indicate that the fixation of HAS and HA ions on 2:1 layer silicates can influence the levels of solution Al species that cause some toxicological problems in terrestrial and aquatic environments.

在pH 4 ~ 8的范围内，研究了羟基铝（HA）或羟基铝硅酸盐（HAS）离子与蛭石或蒙脱石复合物的电荷和表面性质。在pH 4 ~ 6范围内，蛭石或蒙脱石的负电荷因HA或HAS离子的夹层形成而急剧减少。在pH值为7 ~ 8时，复合物的负电荷量接近蒙脱石或蛭石的负电荷量，表明HAS或HA离子被排除在粘土的层间空间之外。在NaOH/Al摩尔比为2.0和2.5时形成的HAS-蒙脱土复合物上产生了显著的正电荷。HAS或HA离子在蒙脱石或蛭石上的固定导致总表面积和内表面积的显着减少，但在外表面积略有增加。羟基铝硅酸盐-粘土复合物通过配体交换将大量的磷酸盐固定在这些粘土的层间和平面表面上。这些数据表明，HAS和HA离子固定在可膨胀的2：1层状硅酸盐上，作为活性Al组分，有助于酸性和非脲基化的Andisols和相关土壤中腐殖质的积累和磷酸盐的保留。我们的数据还表明，固定的HAS和HA离子2：1层状硅酸盐可以影响的水平，导致一些毒理学问题，在陆地和水生环境中的解决方案铝物种。