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Revista U.D.C.A Actualidad & Divulgación Científica
Print version ISSN 0123-4226
Abstract
FERNANDEZ-MAESTRE, Roberto and COLPAS-CASTILLO, Fredy. MERCURY AND CADMIUM ADSORPTION IN SUBBITUMINOUS XANTHATED, SULFONATED OR ACTIVATED CARBON AND COMMERCIAL SYNTHETIC RESIN. rev.udcaactual.divulg.cient. [online]. 2015, vol.18, n.1, pp.241-250. ISSN 0123-4226.
The combustion of low rank coal produces environmental impacts due to its low heat of combustion and high heteroatom content which has promoted its alternative uses as an adsorbent. A subbituminous coal (CS) was oxidized with air at 150°C on a fixed bed for 4 hours and xanthated with carbon disulfide in a basic solution, at 30°C. The resulting xanthated coal (CX) was evaluated for the adsorption of Hg2+ and Cd2+ from 0,100, 1,000, 12.48, 124.8 y 998.3mg/L aqueous solutions; metal concentrations were determined by atomic absorption spectrometry. CX was compared against CS, a sulfonated CS, activated CS (CAp), a commercial activated carbon (CAC), and a commercial synthetic resin (RC) in terms of Hg2+ and Cd2+ adsorption. RC showed the highest adsorption capacity (concentration factor 98%) followed by theCX (concentration factor 96%). The adsorption of cadmium on the sulfonated CS was 0.56meq/g, lower than that of CX, 1.85meq/g. In general, Hg2+ was less adsorbed than Cd2+; the adsorption capacities decreased in the order: RC, CX, sulfonated CS, activated CS, CS, and CAC. CX showed a better Cd2+ adsorption, 81% against 15%, than a non-oxidized 40-hours-xanthated coal, which shows that oxidation of coal increased the amount of oxygenated groups that enhanced xanthation.
Keywords : Adsorption; brown coal; activated carbon; subbituminous coal; xanthation; atomic absorption spectrometry.