Synthesis and characterization of a novel tungstosilicic acid immobilized on zeolites catalyst for the photodegradation of methyl orange

CANDELARIA LEAL MARCHENA; LAURA C. LERICI; MARÍA S. RENZINI; LILIANA B. PIERELLA; LUIS PIZZIO

APPLIED CATALYSIS B-ENVIRONMENTAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016

0926-3373

Materials based on tungstosilicic acid (TSA) immobilized on zeolites (NH4Y andNH4ZSM5) were prepared by wet impregnation of the zeolite matrix with TSA aqueoussolutions. The concentration was varied in order to obtain TSA contents of 5%, 10%, 20%,and 30% w/w in the solid. Catalysts were further characterized by N2 adsorption?desorption isotherms, FT-IR, XRD, DRS-UV-Vis and SEM techniques. The resultingmaterials were evaluated in the photodecomposition of azo dye methyl orange. The resultsrevealed that the materials present suitable properties to be used as catalysts in thephotocatalytic treatment of wastewater containing dyes, and the photodegradation follows apseudo-first-order kinetics. Reaction parameters such as TSA content, catalysts mass,reuses and pH, were evaluated.