A dual function organoclay sorbent for lead and chlorobenzene
- Michigan State Univ., East Lansing, MI (United States). Dept. of Crop and Soil Sciences
- Dow Corning Corp., Midland, MI (United States)
To demonstrate the concept of organoclays with dual sorptive properties, carboxylic group-bearing carboxydecyltriethylammonium [(HOOC)C{sub 10}H{sub 20}N(C{sub 2}H{sub 5}){sub 3}]{sup +} cations (CDTEA) were used to substitute exchangeable inorganic cations of montmorillonite. Sorption of Pb{sup 2+} and chlorobenzene was examined as a function of pH and over a range of equilibrium concentrations at constant pH. The dual sorptive properties of CDTEA-montmorillonite were compared with those of its nonfunctionalized analogue, decyltrimethylammonium (DTMA)-montmorillonite, and with Na-montmorillonite. The infrared spectra showed bands corresponding to the carboxylic acid group and alkyl chain of CDTEA in CDTEA-montmorillonite. Titration of CDTEA-montmorillonite with NaOH indicated the existence of two distinct types of acidity originating from the native acid groups of the clay and the carboxylic groups of CDTEA. Sorption of Pb{sup 2+} by CDTEA-montmorillonite was much higher than that by Na-montmorillonite. Complete removal of 0.00724 cmol L{sup {minus}1} (15 mg L{sup {minus}1}) of Pb{sup 2+} by CDTEA-montmorillonite occurred at pH 5 and above, but this was not achieved by Na-montmorillonite, regardless of pH. Pb{sup 2+} sorption by DTMA-montmorillonite was lower than that by Na-montmorillonite. These results indicate that Pb{sup 2+} is effectively bound to carboxylic groups of CDTEA. Sorption of chlorobenzene by CDTEA-montmorillonite was comparable to that by DTMA-montmorillonite. These results indicate that CDTEA-montmorillonite possesses dual sorptive properties for both heavy metals and organic contaminants. Neither Na- nor DTMA-montmorillonite were effective sorbents for both types of contaminants. The simultaneous removal of Pb{sup 2+} and chlorobenzene by CDTEA-montmorillonite and the non-competitive nature of the sorption processes each suggest that potential utility of such functionalized organoclays in the treatment of water contaminated by both heavy metals and organic chemicals.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 679468
- Journal Information:
- Soil Science Society of America Journal, Vol. 63, Issue 1; Other Information: PBD: Jan-Feb 1999
- Country of Publication:
- United States
- Language:
- English
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