SORPTIVE CAPACITY OF MONTMORILLONITE FOR HYDROXY-CR POLYMERS AND THE MODE OF CR COMPLEXATION

被引:21
作者
DUBBIN, WE
GOH, TB
机构
关键词
D O I
10.1180/claymin.1995.030.3.01
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
Separate montmorillonite suspensions were treated with CrCl3 to give seven Cr(III) concentrations. Each suspension was then titrated with 0.1 N NaOH to give a NaOH/Cr3+ molar ratio of 2.5. Montmorillonite was an effective sorbent for hydroxy-Cr species up to 1200 cmol(+)/kg; above that concentration, sorption continued, though less efficiently. However, N-2-BET specific surfaces and cation exchange capacity measurements indicated that the montmorillonite could sorb significantly more than 1200 cmol(+)/kg. There was virtually no exchangeable Cr in any of the clays, suggesting that this element was covalently bonded to the siloxane surface. Infrared spectroscopy revealed a vibration at 1015-1020 cm(-1) in the Cr clays which was not present in the control. This new absorption band was attributed to an attenuation of the Si-O a(1)(1) vibration caused by inner-sphere complexation of the interlayer Cr with the siloxane oxygen. Because Cr was strongly held and efficiently sorbed, montmorillonite was shown to be an effective sorbent for hydroxy-Cr polymers.
引用
收藏
页码:175 / 185
页数:11
相关论文
共 23 条
[1]   EFFECTS OF PYROPHOSPHATE, EDTA, AND DTPA ON ZINC SORPTION BY MONTMORILLONITE [J].
ASHER, LE ;
BARYOSEF, B .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1982, 46 (02) :271-276
[2]   HG-COMPLEX INTERGRADES IN SMECTITE [J].
BLATTER, CL .
CLAYS AND CLAY MINERALS, 1973, 21 (04) :261-263
[3]   SORPTION CHARACTERISTICS OF ORGANIC-COMPOUNDS ON HEXADECYLTRIMETHYLAMMONIUM-SMECTITE [J].
BOYD, SA ;
MORTLAND, MM ;
CHIOU, CT .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1988, 52 (03) :652-657
[4]  
BRINDLEY GW, 1979, AM MINERAL, V64, P830
[5]   HYDRATION STATES OF INTERLAMELLAR CHROMIUM IONS IN MONTMORILLONITE [J].
CARR, RM .
CLAYS AND CLAY MINERALS, 1985, 33 (04) :357-361
[6]  
Carter D. L., 1986, Methods of soil analysis. Part 1. Physical and mineralogical methods, P413
[7]  
CHESLOCKFITZGER.MM, 1990, THESIS U MANITOBA CA
[8]  
Cotton FA., 1988, ADV INORG CHEM, V5
[9]   INTERCALATION OF MONTMORILLONITE WITH INDIVIDUAL CHROMIUM(III) HYDROLYTIC OLIGOMERS [J].
DRLJACA, A ;
ANDERSON, JR ;
SPICCIA, L ;
TURNEY, TW .
INORGANIC CHEMISTRY, 1992, 31 (23) :4894-4897
[10]   PROPERTIES OF HYDROXY-AL AND HYDROXY-CR INTERLAYERS IN MONTMORILLONITE [J].
DUBBIN, WE ;
GOH, TB ;
OSCARSON, DW ;
HAWTHORNE, FC .
CLAYS AND CLAY MINERALS, 1994, 42 (03) :331-336