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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 9
[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
Total Affiliations: 3
Document type: Journal article
Source: Solar Energy; v. 190, p. 239-245, SEP 15 2019.
Web of Science Citations: 1

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)

FAPESP's process: 17/11986-5 - Research Division 1 - dense energy carriers
Grantee:Ana Flávia Nogueira
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 13/07276-1 - CEPOF - Optics and Photonic Research Center
Grantee:Vanderlei Salvador Bagnato
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/23430-9 - Exploring stochastic dynamics of nanomaterials
Grantee:René Alfonso Nome Silva
Support type: Regular Research Grants