Extended and local structural characterization of a natural and 800 °C fired Na-montmorillonite-Patagonian bentonite by XRD and Al/Si XANES

被引：46
作者：
Andrini, L. [1 ]
Moreira Toja, R. [2 ,3 ]
Gauna, M. R. [2 ]
Conconi, M. S. [2 ]
Requejo, F. G. [1 ]
Rendtorff, N. M. [2 ,3 ]
机构：
[1] UNLP CONICET La Plata, Inst Fisicoquim Teor & Aplicada INIFTA, 64 & Diagonal 113, RA-1900 La Plata, Argentina
[2] CIC CONICET CCT La Plata, Ctr Tecnol Recursos Minerales & Ceram CETMIC, Camino Centenario & 506,CC49,B1897ZCA, Manuel B Gonnet, Argentina
[3] Univ Nacl La Plata, Fac Ciencias Exactas, Dept Quim, 47 & 115, RA-1900 La Plata, Argentina
来源：
APPLIED CLAY SCIENCE | 2017年 / 137卷
关键词：
Bentonite; Montmorillonite; Fired bentonite; Structure; XANES; RAY-ABSORPTION SPECTROSCOPY; NEAR-EDGE STRUCTURE; PHYSICOCHEMICAL CHARACTERIZATION; THERMAL-TREATMENT; K-EDGE; CLAY; SI; ALUMINUM; COORDINATION; SEPIOLITE;
D O I：
10.1016/j.clay.2016.12.030
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A structural characterization of a Patagonian bentonite and its corresponding heating product (800 degrees C) was carried out. The nature of aluminum and silicon atoms was investigated using Al and Si K-XANES spectroscopy and compared with other well-known Al and/or Si containing materials. The studied material comes from Lago Pellegrini area-Rio Negro Province, Argentina. The main crystalline phase was confirmed to be a Na-montmorillonite. The thermal behavior was studied by DTA-TG-DTG and XRD. A Rietveld based quantification was performed as complementary study. About 90% Na-montmorillonite (clay mineral of smectite Group) content was confirmed and different impurities (quartz, gypsum and feldspars) were also quantified. The smectitic interlayer thermal displacement was determined between 15.49 and 9.81 A. The XANES results allowed obtaining the Al-IV/Al-VI ratio and the local symmetry and distortions at Si and Al-sites. The tetra-coordination of silicon and the aluminum tetra and hexa-coordinated was found in both materials. The expected high Al-IV/Al-VI ratio was confirmed and pondered for the thermally treated bentonite. (C) 2016 Elsevier B.V. All rights reserved.
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页码：233 / 240
页数：8
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