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Biochemistry, molecular biology, biophysics, Biochimie, biologie moléculaire, biophysique, General chemistry, physical chemistry, Chimie générale, chimie physique, Nanotechnologies, nanostructures, nanoobjects, Nanotechnologies, nanostructures, nanoobjets, Polymers, paint and wood industries, Polymères, industries des peintures et bois, Sciences exactes et technologie, Exact sciences and technology, Chimie, Chemistry, Chimie generale et chimie physique, General and physical chemistry, Physicochimie de surface, Surface physical chemistry, Matériaux adsorbants, Adsorbents, Angiospermae, Composé benzénique, Benzenic compound, Compuesto bencénico, Dicotyledones, Myrtaceae, Spermatophyta, Adsorption, Adsorción, Charbon actif, Activated carbon, Carbón activado, Cinétique, Kinetics, Cinética, Déchet, Wastes, Desperdicio, Eucalyptus, Industrie bois, Wood industry, Industria madera, Isotherme, Isotherm, Isoterma, Phénol, Phenol, Fenol, Phénols, Phenols, Fenoles, Poudre, Powder, Polvo, Valorisation, Upgrading, Valorización, Adsorption kinetics, and Granulation

Eucalyptus grandis sawdust, a major waste from the growing Uruguayan wood industry, was used in previous work to prepare powdered activated carbon (PAC). In the present work, granular activated carbon (GAC) was prepared by mixing PAC, carboxymethyl cellulose as a binder, and kaolin as reinforcer. Ultimate analysis and surface characterization of GAC and PAC were performed. Phenol adsorption was used as a way to compare the characteristics of different PAC and GAC preparations. Kinetics and isotherms of the different GAC and PAC were performed in a shaking bath at 100 rpm and 298 K. Phenol concentrations were determined by UV spectroscopy. Some kinetics parameters were calculated; from kinetics results, external resistance to mass transfer from the bulk liquid can be neglected as the controlling step. Isotherms were fitted to Langmuir and Freundlich models, and corresponding parameters were determined. Maximum phenol uptakes for all carbons were determined and correlated with carbon characteristics. Thermogravimertic analysis (TGA) determinations were performed in order to study adsorption characteristics and conditions for GAC regeneration after its use. The results showed that phenol is preferentially physisorbed on the carbon of the granules, though some chemisorption was detected. No adsorption was detected in the kaolin-carboxymethyl cellulose mixture.

LACTOBACILLUS, LACTIC acid, FERMENTATION, BIOMASS, BACTERIAL growth, and ANTIBIOTICS

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