The formation of metastable aluminosilicates in the Al-Si-H2O system: Results from solution chemistry and solid-state NMR spectroscopy

被引：11

作者：

Mason, Harris E. ^{[1
]}

Maxwell, Robert S. ^{[1
]}

Carroll, Susan A. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 2011年 / 75卷 / 20期

关键词：

BIOGENIC SILICA DISSOLUTION; AL-27 MAS NMR; CHEMICAL-SHIFTS; SCALE FORMATION; SOUTHERN-OCEAN; ALUMINUM; SI-29; SURFACE; WATER; ACID;

D O I：

10.1016/j.gca.2011.07.031

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We present the results of a series of experiments designed to probe the interactions between Al and the amorphous silica surface as a function of thermodynamic driving forces. The results from Al-27 single pulse magic angle spinning (SP/MAS) and Al-27{H-1} rotational echo double resonance (REDOR) allow us to identify the reaction products and constrain their structure. In all cases, despite low Al and Si concentrations we observe the formation of metastable aluminosilicates. Results from low temperature experiments indicate that despite thermodynamic driving forces for the formation of gibbsite we observe the precipitation of separate octahedrally coordinated Al (Al-[6]) and tetrahedrally coordinated Al (Al-[4]) silicate phases. At higher temperatures the Al-[4] silicate phase dominates the speciation. Structural models derived from the NMR data are also proposed, and the results are discussed as they relate to previous work on Al/Si cycling. Published by Elsevier Ltd.

引用

页码：6080 / 6093

页数：14

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