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Characterization and preliminary assessment of a sorbent produced by accelerated mineral carbonation

Characterization and preliminary assessment of a sorbent produced by accelerated mineral carbonation

Shtepenko, O., Hills, Colin, Coleman, Nichola and Brough, A. (2005) Characterization and preliminary assessment of a sorbent produced by accelerated mineral carbonation. Environmental Science & Technology, 39 (1). pp. 345-354. ISSN 0013-936X (Print), 1520-5851 (Online) (doi:10.1021/es030113t)

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Abstract

This study shows that calcium silicate/aluminate-based materials can be carbonated to produce sorbents; for metal removal. The material chosen for investigation, cement clinker, was accelerated carbonated, and its structural properties were investigated using X-ray diffraction (XRD), scanning electron microscopy, thermal gravimetric and differential thermal analysis, nuclear magnetic resonance spectroscopy, and nitrogen gas adsorption techniques. The principal carbonation reactions involved the transformation of dicalcium silicate, tricalcium silicate, and tricalcium aluminate into a Ca/Al-modified amorphous silica and calcium carbonate. It was found that carbonated cement had high acid buffering capacity, and maintained its structural integrity within a wide pH range. The uptake of Pb(II), Cd(11), Zn(II), Ni(II), Cr(III), Sr(II), Mo(VI), Cs(I), Co(II), and Cu-(II) from concentrated (1000 mg L-1) single-metal solutions varied from 35 to 170 mg g(-1) of the carbonate cement. The removal of metals was hardly effected by the initial solution pH due to the buffering capability of the carbonated material. The kinetics of Pb, Cd, Cr, Sr, Cs, and Co removal followed a pseudo-second-order kinetic model, whereas the equilibrium batch data for Cu fitted the pseudo-first-order rate equation. PHREEQC simulation supported by XRD analysis suggested the formation of metal carbonates and silicates, calcium molybdate, and chromium (hydro)oxide. Cesium was likely to be adsorbed by Ca/Al-modified amorphous silica.

Item Type: Article
Uncontrolled Keywords: Carbonation
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Last Modified: 17 Oct 2016 09:12
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/11824

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