Author(s)

O. L. Shtepenko, N. J. Coleman & C. D. Hills

Abstract

An innovative approach to the synthesis of sorbent materials for metal fixation 0. L. Shtepenko, N. J. Coleman & C. D. Hills Department of Earth & Environmental Sciences, Natural Resources Institute, University of Greenwich, UK Abstract A new approach has been developed for the synthesis of wastewater treatment materials from calcareous substrates via the process of accelerated carbonation. This paper presents results from an investigation of the characterization and performance testing of carbonated ordinary Portland cement (CASM) as a sorbent for metal removal. CASM was synthesized by exposing cement to carbon dioxide gas, at a pressure of 2 bar, in the presence of moisture. The resulting product had funnel-shaped pores of 30-40W and a specific surface area of 49m2g-1. The main phases of CASM were crystalline polymorphs of calcium carbonate, amorphous silicalalumina and unreacted mineral phases. In a sessile kinetic sorption study CASM demonstrated the following trend in metal uptake (in mgl

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