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- Adolfo A. Pájaro-Payares, Eduardo A. Espinosa-Fuentes, Fredy Colpas-Castillo, Johana Rodriguez-Ruiz, Roberto Fernandez-Maestre, Edgardo Meza-Fuentes, Effect of particle size and oxidant concentration in the yield of humic acids from mineral coal using response surface methodology , Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales: Vol. 41 No. 160 (2017)
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Activated carbons were prepared with sugar cane bagasse (BC) and corn cob (ZM) to adsorb aqueous cadmium and lead. BC and ZM were carbonized at 400°C for 1 hour, activated with phosphoric acid and modified with nitric acid or hydrogen peroxide and subsequent heating. Activation increased the surface area of carbons (5 m2/g to 778 m2/g for ZM and 3 m2/g to 369 m2/g for BC). Oxygenated groups were analyzed by IR-DRIFTS. The acidity of carbons was between 1.36 and 2.12 meq/g, pH between 2.9 and 6.5, and ion exchange capacities up to 0.070 meq/g (atomic absorption).
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