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

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

APPLIED CATALYSIS B-ENVIRONMENTAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 188 p. 23 - 30

0926-3373

Materials based on tungstosilicic acid (TSA) immobilized on zeolites (NH4Y and NH4ZSM5) were preparedby wet impregnation of the zeolite matrix with TSA aqueous solutions. The concentration was varied inorder to obtain TSA contents of 5%, 10%, 20%, and 30% w/w in the solid. Catalysts were further character-ized by N2adsorption?desorption isotherms, FT-IR, XRD, DRS-UV?vis and SEM techniques. The resultingmaterials were evaluated in the photodecomposition of azo dye methyl orange. The results revealedthat the materials present suitable properties to be used as catalysts in the photocatalytic treatment ofwastewater containing dyes, and the photodegradation follows a pseudo-first-order kinetics. Reactionparameters such as TSA content, catalysts mass, reuses and pH, were evaluated.