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Titolo:
Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix
Autore:
Cioffi, R; Maffucci, L; Santoro, L; Glasser, FP;
Indirizzi:
Univ Naples Federico II, Dipartimento Chim, I-80134 Naples, Italy Univ Naples Federico II Naples Italy I-80134 Chim, I-80134 Naples, Italy Univ Basilicata, Dipartimento Ingn & Fis Ambiente, I-85100 Potenza, Italy Univ Basilicata Potenza Italy I-85100 s Ambiente, I-85100 Potenza, Italy Univ Aberdeen, Dept Chem, Aberdeen AB24 3UE, Scotland Univ Aberdeen Aberdeen Scotland AB24 3UE em, Aberdeen AB24 3UE, Scotland
Titolo Testata:
WASTE MANAGEMENT
fascicolo: 7, volume: 21, anno: 2001,
pagine: 651 - 660
SICI:
0956-053X(2001)21:7<651:SOCUOB>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROPHOBIC LAYER SILICATES; ALCOHOL-BENZENE MIXTURES; INDUSTRIAL-WASTES; CLAY-MINERALS; ADSORPTION; SOLIDIFICATION; ADSORBENTS; ISOTHERMS; SORPTION; SURFACE;
Keywords:
organophilic bentonite; chloro-organics; adsorption; stabilization; slag cement;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Santoro, L Univ Naples Federico II, Dipartimento Chim, Via Mezzocannone 4,I-80134 Naples, Italy Univ Naples Federico II Via Mezzocannone 4 Naples Italy I-80134
Citazione:
R. Cioffi et al., "Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix", WASTE MAN, 21(7), 2001, pp. 651-660

Abstract

The application of cement-based stabilisation/solidification treatment to organic-containing wastes is made difficult by the adverse effect of organics on cement hydration. The use of organophilic clays as pre-solidificationadsorbents of the organic compounds can reduce this problem because of thehigh adsorption power of these clays and their compatibility with the cementitious matrix. This work presents an investigation of the effect on hydration kinetics, physico-mechanical properties and leaching behaviour of cement-based solidified waste forms containing 2-chlorophenol and 1-chloronapthalene adsorbed on organophilic bentonites. These were prepared by cation exchange with benzyldimethyloctadecylammonium chloride and trimethyloctadecylammonium chloride. The binder was a 30% pozzolanic cement, 70% granulated blast furnace slag mixture. Several binder-to-bentonite ratios and differentconcentrations of the organics on the bentonite were used. Kinetics of hydration were studied by measurement of chemically bound water and by means of thermal and calorimetric analyses. Microstructure and other physico-mechanical properties of the solidified forms were studied by means of mercury intrusion porosimetry, scanning electron microscopy and unconfined compressive strength measurement. Leaching was checked by two different leaching tests: one dynamic, on monolithic samples, and the other static, on powdered samples. This study indicates that the incorporation of the organic-loaded bentonite in the binder matrix causes modifications in the hardened samples by altering cement hydration. The effects of the two organic contaminants are differentiated. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 26/09/17 alle ore 09:27:32