MAS NMR and EPR study of structural changes in talc and montmorillonite induced by grinding

被引：23

作者：

Borges, Roger ^{[1
]}

Dutra, Livia Macedo ^{[2
]}

Barison, Andersson ^{[2
]}

Wypych, Fernando ^{[1
]}

机构：

[1] Univ Fed Parana, CEPESQ, Res Ctr Appl Chem, Dept Chem, POB 19032, BR-81530980 Curitiba, PR, Brazil

[2] Univ Fed Parana, NMR Ctr, Dept Chem, POB 19032, BR-81530980 Curitiba, PR, Brazil

来源：

CLAY MINERALS | 2016年 / 51卷 / 01期

关键词：

mechanochemical activation; 2:1 clay minerals; redox reactions; MAS NMR; EPR; SLOW-RELEASE FERTILIZERS; SOLID-STATE NMR; CLAY-MINERALS; BEHAVIOR; SPECTROSCOPY; HYDROXIDES; SILICATES; BENTONITE; ALUMINA; FTIR;

D O I：

10.1180/claymin.2016.051.1.06

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：

The milling process in the solid-state 2:1 clay minerals, montmorillonite and talc, which have different cation exchange capacities, is reported here. Several instrumental techniques were used to monitor systematically the products formed. The dehydroxylation/amorphization of the montmorillonite and talc structures occurs within 3 and 6 h of milling, respectively. Electron paramagnetic resonance spectra indicated that structural Mn2+ was oxidized more quickly in the montmorillonite structure than in talc, while the paramagnetic defects increased during milling. Nuclear magnetic resonance was also used to monitor the environmental changes for Si and Al during milling.

引用

页码：69 / 80

页数：12

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