Title: Sorptive capacity of montmorillonite for hydroxy-Cr polymers and the mode of Cr complexation
Abstract:Abstract Separate montmorillonite suspensions were treated with CrCl 3 to give seven Cr(III) concentrations. Each suspension was then titrated with 0.1 N NaOH to give a NaOH/Cr 3+ molar ratio of 2.5. ...Abstract Separate montmorillonite suspensions were treated with CrCl 3 to give seven Cr(III) concentrations. Each suspension was then titrated with 0.1 N NaOH to give a NaOH/Cr 3+ 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.Read More
Publication Year: 1995
Publication Date: 1995-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 19
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