Artículos de revistas
High Performance Maleated Lignocellulose Epicarp Fibers For Copper Ion Removal
Registro en:
Brazilian Journal Of Chemical Engineering. Assoc. Brasiliera De Eng. Quimica / Braz. Soc. Chem. Eng., v. 31, n. 1, p. 183 - 193, 2014.
1046632
10.1590/S0104-66322014000100017
2-s2.0-84899929353
Autor
Vieira A.P.
Santana S.A.A.
Bezerra C.W.B.
Silva H.A.S.
Santos K.C.A.
Melo J.C.P.
Silva Filho E.C.
Airoldi C.
Institución
Resumen
Natural lignocellulosic fiber epicarp extracted from the babassu coconut (Orbignya speciosa) was chemically modified through reaction with molten maleic anhydride without solvent, with incorporation of 189.34 mg g-1 of carboxylic acid groups into the biopolymer structure. The success of this reaction was also confirmed by the presence of carboxylic acid bands at 1741 and 1164 cm-1 in the infrared spectrum. Identically, the same group is observed through13C NMR CP/MAS in the solid state, via high field signals in the 167 pm region. Both the precursor and the immobilized maleated biopolymers presented nearly the same thermal stability and similar crystallinity to cellulose. However, the pendant carboxylic groups have the ability to remove copper with maximum sorption through a batchwise process at pH 6.0, as expected from the point of zero charge, determined to be 6.45. 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