FUNCTIONALIZED SILICA NANOPARTICLES AND MICROPARTICLES WITH AT LEAST NE GUANIDINE GROUP; METHOD OF PREPARATION; METHOD TO REMOVE ANIONS FROM EFLUENTS; AND USE OF SAID PARTICLES
ARISMENDI MACUER, MARLENE NATALIA; GONZALEZ NILO, FERNANDO DANILO; VALENCIA GALLEGOS, JESUS ANGEL; FACCINI, MIRKO; GARCIA FERNANDEZ, MARIA DE LOS ANGELES