S. Loera-Serna, Elba Ortiz, Hugo Solis, D.Y. Medina-Velazquez
Universidad Autonoma Metropolitana Azcapotzalco, Mexico
pp. 592 - 595
Keywords: zeolites, pigments, retention
Several materials such as synthetic zeolites, clays and aluminas were studied as sorbent pigments. Majority of materials need pre-treatment to be capable to absorb molecules on the porous structure. These treatments include thermal treatment, washing whit several solvents, cation exchange, among others. At the same time, treatment increases the cost to use porous material as sorbent in some industrial process. An alternative of these synthetic materials is natural zeolites. In this work, some Mexican natural zeolites (mordenite, clinoptilolite and eriotnite) have been used as starting material for retain six different pigments: basic fucsin, violet crystal, methilene blue, black mordent 13, isatin, para-red, black direct C.I. and eriochrom black T. Porous materials were characterized by X-ray diffraction, IR spectroscopy, energy-dispersive X-ray spectroscopy and sacanning electron microscopy. UV-Vis determined pigment sorpion capacity. The high thermal stability (ca. 700 °C for clinoptilolite) and high pigment loading (ca. 50 %) indicate that Mexican zeolites are good adsorbents for pigment removal.