Effect of TiO2 surface modification in Rhodamine B photodegradation

Autor(es)

Libanori, Rafael ^[1] ; Giraldi, Tania R. ^[2] ; Longo, Elson ^[3] ; Leite, Edson R. ^[1] ; Ribeiro, Caue ^[2]

Afiliação do(s) autor(es)

^[1] CMDMC LIEC UFSCar, BR-13565905 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentacao Agropecuaria, BR-13560970 Sao Carlos, SP - Brazil

^[3] UNESP, LIEC, CMDMC, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Sol-Gel Science and Technology; v. 49, n. 1, p. 95-100, JAN 2009.
• Citações Web of Science: 50

Resumo

Commercial TiO(2) nanoparticles were superficially modified through polymeric resins obtained from polymerization of citrate complexes of Y(3+) and Al(3+) with ethylenglycol. The materials were treated at 450 A degrees C for 4 h to obtain modified nanoparticles, which were characterized by HR-TEM, Zeta potential and surface area through N(2) fisisorption. Rhodamine B photodegradation by visible light irradiation and in presence of those modified nanoparticles was compared with the same process in presence of unmodified commercial TiO(2) nanoparticles. It was observed, by UV-visible spectroscopy, that the catalytic photoactivity in presence of modified nanoparticles was smaller than that observed with commercial TiO(2) nanoparticles. However, the surface modifier played an important role in the photodegradation kinetic process, showing a non-linear relation between modifier amount and photodegradation rate, presenting a maximum value at 0.8% (w/w). (AU)

• Processo FAPESP: 05/56120-8 - Estudo da transferência eletrônica fotoativada em nanopartículas de TiO2 encapsuladas com Y203 sensitizados por corantes
• Beneficiário: Rafael Augusto Nicolosi Libanori
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica