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Designing activated carbons from natural and synthetic raw materials for pollut...
P.A.M. Mourão; I.P.P. Cansado; P.J.M. Carrott; M.M.L. Ribeiro CarrottOver the last decades the literature has shown the possibility of producing activated carbons (AC) from a wide variety of raw materials, and to use them as one of the most environmentfriendly solutions for waste disposal [1]. Simultaneously, it has been shown that the adsorption of pollutants from different sources by activated carbons is one of the most efficient techniques for remediating or solving this kind...
Characterization of the surface of activated carbons produced from tire residues
J.M. Valente Nabais; C. Laginhas; P.J.M. Carrott; M.M.L. Ribeiro Carrott; P.C. Galacho; J.E.C. Amorós; A.V.N. GisbertThe surface characterisation of new activated carbons produced from tire residues by activation with carbon dioxide was studied. The activated carbons produced were mainly basic with point of zero charge values above 8.8. The main surface functional groups identified by FTIR were ether, quinones, lactones, ketones, hydroxyls (free and phenol) and pyrones. The XRD analysis shows that the materials produced have ...
Structural characterisation and mechanical stability of titanium substituted me...
P.C. Galacho; M.M.L. Ribeiro Carrott; J. Valério; P.J.M. Carrott; J.M. Valente NabaisMesoporous silica and titanium SBA-15 samples with different Si/Ti molar ratio were prepared by direct one-step synthesis under strongly acidic hydrothermal conditions. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77K. The Si/Ti values of the final calcined materials were determined by ICP analysis. It was found that all samples presented 2-D hexagonal structures with high degre...
Ordered mesoporous silica materials for protein adsorption
F. Sezões; M.M.L. Ribeiro Carrott; P.A.M. Mourão; P.A. Russo; P.J.M. CarrottLysozyme and BSA were used, as model proteins of considerably different dimensions, in order to evaluate the influence of the distinct pore structural characteristics of three types of ordered mesoporous silica materials (MCF, SBA-15 and MCM-41) on protein adsorption. Characterisation by X ray diffraction and nitrogen adsorption at 77K revealed the typical pore structural features of each type of material. The ...
Hydrothermal stability of ordered mesoporous titanosilicate materials prepared ...
P.C. Galacho; M.M.L. Ribeiro Carrott; P.J.M. Carrott; I.P.P. CansadoA study of hydrothermal stability, performed in boiling water under static conditions, of MCM-41 materials containing different titanium content, prepared by direct synthesis at ambient temperature and pressure, using tetraethoxysilane, titanium ethoxide and octadecyltrimethylammonium bromide is presented. The behaviour is compared with pure silica grades prepared by a similar procedure. The samples were charac...
Activated Carbons Prepared from Natural and Synthetic Raw Materials with Potent...
I.P.P. Cansado; P.A.M. Mourão; M.M.L. Ribeiro Carrott; P.J.M. CarrottA carbon molecular sieve for the purification of a gas mixtures containing O2, N2 and CO2, CH4 was produced from a waste granulated PET by means of a single carbonisation step at 973 K. Activated carbon materials presenting good adsorption capacity and some selectivity for O2/N2 and CO2/CH4 were prepared from granulated PET and cork oak with pore mouth narrowing using CVD from benzene. The diffusion coefficient...
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