naa a22 4500 510751202 CHVBK 20180411083105.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11270-013-1531-3 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1531-3 A Comparison Between a Low-Cost Sorbent and an Activated Carbon for the Adsorption of Heavy Metals from Water [Elektronische Daten] [A. Erto, L. Giraldo, A. Lancia, J. Moreno-Piraján] In this work, a coal combustion ash (CCA) has been tested as an alternative low-cost sorbent to commercial activated carbons (GAC) for cadmium and zinc removal from polluted water. To this aim, the effect of pH and metal concentration on CCA adsorption capacity has been investigated, and a comparative analysis with GAC has been carried out in the same experimental conditions. Furthermore, in order to improve CCA adsorption capacity, two different activation treatments of raw CCA have been tested. In particular, the CCA was subjected to a gasification process conducted with steam and to different acidic treatments, conducted either with hydrochloric acid or nitric acid at different acid concentrations. Experimental results showed that all the acid treatments determined a substantial reduction of both cadmium and zinc adsorption capacity. Differently, the steam gasification determined a substantial increase in adsorption capacity with respect to raw CCA, in particular for zinc as its adsorption capacity resulted even higher than the correspondent of GAC. Finally, a thorough analysis of sorbent physical and chemical properties and of adsorption data allowed the individuation of the main cadmium/zinc adsorption mechanism both on CCA and activated carbon, adequately described by the Freundlich model. Springer Science+Business Media Dordrecht, 2013 Waste recycle nationallicence Fly ash nationallicence Activated carbon nationallicence Adsorption nationallicence Cadmium nationallicence Zinc nationallicence Water treatment nationallicence Erto A. Dipartimento di Ingegneria Chimica, Università degli Studi di Napoli Federico II, Naples, Italy aut Giraldo L. Departamento de Química, Universidad Nacional de Colombia, Bogotá, Colombia aut Lancia A. Dipartimento di Ingegneria Chimica, Università degli Studi di Napoli Federico II, Naples, Italy aut Moreno-Piraján J. Departamento de Química, Universidad de los Andes, Bogotá, Colombia aut Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-10 0049-6979 224:4<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1531-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1531-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Erto A. Dipartimento di Ingegneria Chimica, Università degli Studi di Napoli Federico II, Naples, Italy aut NATIONALLICENCE 700 1- Giraldo L. Departamento de Química, Universidad Nacional de Colombia, Bogotá, Colombia aut NATIONALLICENCE 700 1- Lancia A. Dipartimento di Ingegneria Chimica, Università degli Studi di Napoli Federico II, Naples, Italy aut NATIONALLICENCE 700 1- Moreno-Piraján J. Departamento de Química, Universidad de los Andes, Bogotá, Colombia aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-10 0049-6979 224:4<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer