Mechano-chemical effects on surface properties and molybdate exchange on hydrotalcite

被引：7

作者：

Bonifacio-Martinez, J. ^{[1
]}

Serrano-Gomez, J. ^{[1
]}

Del Carmen Lopez-Reyes, Ma. ^{[1
]}

Granados-Correa, F. ^{[1
]}

机构：

[1] Inst Nacl Invest Nucl, Mexico City 11901, DF, Mexico

来源：

CLAY MINERALS | 2009年 / 44卷 / 03期

关键词：

mechano-chemical; characterization methods; hydrotalcite; layered double hydroxide; LDH; molybdate; sorption; surfaces; SOLID BASE CATALYSTS; ANION-EXCHANGE; SORPTION;

D O I：

10.1180/claymin.2009.044.3.311

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 effects of mechano-chemical treatment on the surface characteristics and sorption properties of hydrotalcite were studied. Non-milled (crushed) and milled samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analysis and specific area. A milling time of 2 h decreased the particle size of the hydrotalcite samples from 21 to 8.0 nm, the specific area from 97 to 5.7 m(2) g(-1) and the total pore volume from 0.41 to 0.01 cm(3). After the crushed and milled samples had been separately calcined at 500 degrees C, they were agitated with 10(-2) M Na2MoO4 aqueous solutions for 48 h. The molybdate ion content in the regenerated non-milled hydrotalcite samples (HTc-MoO4) was found to be 6.0 meq g(-1) while in the milled hydrotalcite (HTm-MoO4) samples this content was 2.5 meq g(-1). The lower molybdate content was thought to be a result of compaction and, hence, reduced reactivity of the milled HT samples.

引用

页码：311 / 317

页数：7

共 15 条

[1] HYDROTALCITE-TYPE ANIONIC CLAYS: PREPARATION, PROPERTIES AND APPLICATIONS [J].

Cavani, F. ;

Trifiro, F. ;

Vaccari, A. .

CATALYSIS TODAY, 1991, 11 (02) :173-301

[2] Competition between monovalent and divalent anions for calcined and uncalcined hydrotalcite: Anion exchange and adsorption sites [J].

Chatelet, L ;

Bottero, JY ;

Yvon, J ;

Bouchelaghem, A .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1996, 111 (03) :167-175

[3] SYNTHESIS OF ISOPOLYMETALATE-PILLARED HYDROTALCITE VIA ORGANIC-ANION-PILLARED PRECURSORS [J].

DREZDZON, MA .

INORGANIC CHEMISTRY, 1988, 27 (25) :4628-4632

[4]

GRANADOSCORREA F, 2006, J RADIOANAL NUCL CHE, V268, P95

[5] Characterization of repeatedly reconstructed Mg-Al hydrotalcite-like compounds: Gradual segregation of aluminum from the structure [J].

Hibino, T ;

Tsunashima, A .

CHEMISTRY OF MATERIALS, 1998, 10 (12) :4055-4061

[6]

Kang MJ, 1996, RADIOCHIM ACTA, V75, P169

[7]

LOWELL S, 1979, INTRO POWDER SURFACE, P65

[8]

REY F, 1992, CHEM SOC FARADAY T, V88, P4055

[9]

Roelofs JCAA, 2002, CHEM-EUR J, V8, P5571, DOI 10.1002/1521-3765(20021216)8:24<5571::AID-CHEM5571>3.0.CO

[10]

2-R

← 1 2 →