Real time single TiO2 nanoparticle monitoring of the photodegradation of methylene blue

Autor(es)

Oliveira, Guilherme H. ^[1] ; Galante, Miguel T. ^[1] ; Martins, Thalyta T. ^[2] ; dos Santos, Leonardo F. L. S. ^[2] ; Ely, Fernando ^[3] ; Longo, Claudia ^[1] ; Goncalves, Renato V. ^[2] ; Muniz, Sergio R. ^[2] ; Nome, Rene A. ^[1]

Afiliação do(s) autor(es)

^[1] State Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil

^[3] CTI Renato Archer, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Solar Energy; v. 190, p. 239-245, SEP 15 2019.
• Citações Web of Science: 1

Resumo

We report a proof-of-concept micro-spectroscopy, stochastic dynamics, and optical trapping study of a well-known reaction for methylene blue photodegradation catalyzed by titanium dioxide aggregates and nanotubes. Photocatalysis is performed under a high concentration of reactants and catalyst loading to characterize the fundamental chemical kinetics and dynamics aspects of this reaction under in operando conditions. We also report the effect of substrate concentration, light intensity, and substrate/catalyst ratio on the kinetic profiles. Optical imaging is used to quantify how spatial and concentration variations affect the reaction kinetics. To study the dynamics of individual nanoparticle catalysts under in operando conditions, we use optical trapping to characterize the stochastic dynamics of single TiO2 nanotubes. Overall, the results presented here indicate that the setup can be used to monitor photocatalytic degradation of methylene blue with simultaneous measurements of images and spectra while also monitoring the catalyst Brownian motion at the single-particle level. (AU)

• Processo FAPESP: 17/11986-5 - Divisão de Pesquisa 1 - portadores densos de energia
• Beneficiário: Ana Flávia Nogueira
• Linha de fomento: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 16/23430-9 - Explorando a dinâmica estocástica de nanomateriais
• Beneficiário: René Alfonso Nome Silva
• Linha de fomento: Auxílio à Pesquisa - Regular