Immobilization of organic pollutants in cement pastes admixed with organophilic materials.
The results of 2-chloroaniline (2-CA) immobilization experiments in cement matrices, using an organophilic clay modified with phenolic resins as pre-sorbent, are shown. The 2-CA suspended in water was kept in contact with the organoclay for 24 h, and the slurry obtained was then admixed with ordinary Portland cement (OPC) without additional water, to obtain a firm solid waste. Six cement-clay pastes were prepared with the same water-to-cement ratio (0.50 wt/wt), but with different slurry composition (water-to-organoclay ratio equal to 10 and 5 wt/wt, respectively) and different amounts of 2-CA suspended in water, namely 5000, 15 000, and 25 000 ppmw (weight). Dynamic leach tests were performed on solidified monoliths in order to assess the successful immobilization of the 2-CA. Moreover, X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy analyses were carried out.
Dotelli
Giovanni
G
Department of Chemistry, Materials and Chemical Engineering "G. INSTM R.U.-Polimi, Politecnico di Milano, Milano, Italy. giovanni.dotelli@polimi.it
Stampino
Paolo Gallo
PG
Zampori
Luca
L
Sora
Isabella Natali
IN
Pelosato
Renato
R
D000538:Aluminum Silicates / Q000737:chemistry; D000814:Aniline Compounds / Q000737:chemistry*; D000077215:Clay; D003252:Construction Materials / Q000032:analysis*; D004785:Environmental Pollutants / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009930:Organic Chemicals / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry; D012117:Resins, Synthetic; D014867:Water / Q000737:chemistry
D000538:Aluminum Silicates; D000814:Aniline Compounds; D004785:Environmental Pollutants; D009930:Organic Chemicals; D010636:Phenols; D012117:Resins, Synthetic; D014867:Water; C025257:2-chloroaniline; D000077215:Clay