title: Evaluation of photocatalytic activities of supported catalysts on NaX zeolite or activated charcoal.
abstract: This study aimed to evaluate the photocatalytic activity of ZnO and Nb2O5 catalysts, both supported on NaX zeolite and activated charcoal (AC). The synergistic effect between oxide and support and the influence of solution pH (3, 7 and 9) on photocatalytic degradation of reactive blue 5G (C.I. 222) were analyzed. The catalysts Nb2O5/NaX, Nb2O5/AC and ZnO/NaX, ZnO/AC with 5 and 10% (wt%) were prepared by wet impregnation. The results showed that the catalysts exhibit quite different structural and textural properties. The synergic effect between ZnO and NaX support was higher than that with the activated charcoal, showing that these catalysts were more efficient. The most photoactive catalyst was 10% ZnO/NaX which showed 100% discoloration of the dye solution at pH 3, 7 and 9 after 0.5, 5 and 2h of irradiation, respectively. The hydrolytic nature of zeolite favored the formation of surface hydroxyl radicals, which increased the activity of the photocatalyst. Thus, catalysts supported on NaX zeolite are promising for use in photocatalysis.
authors: Chemical Engineering Department, Universidade Estadual de Maringá (UEM), Av. Colombo, 5790, CEP 87020-900 Maringá, PR, Brazil; Sanitary and Environmental Engineering Department, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Campus Pampulha, Belo Horizonte, MG, Brazil.
authors: Fernanda F
authors: FF
authors: de Brites-Nóbrega
authors: Aldino N B
authors: AN
authors: Polo
authors: Angélica M
authors: AM
authors: Benedetti
authors: Mônica M D
authors: MM
authors: Leão
authors: Veronice
authors: V
authors: Slusarski-Santana
authors: Nádia R C
authors: NR
authors: Fernandes-Machado
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D002606:Charcoal / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry / Q000528:radiation effects*; D010087:Oxides / Q000737:chemistry / Q000528:radiation effects*; D010782:Photolysis; D014466:Ultraviolet Rays; D017641:Zeolites / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry / Q000528:radiation effects*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D010087:Oxides; D009556:Niobium; D017641:Zeolites; D002606:Charcoal; C073337:niobium pentoxide; D015034:Zinc Oxide
keywords: Activated charcoal; Photocatalysis; Supported catalysts; Zeolite