Nanomaterials of sodium titanate: structure, morphology and photocatalytic and sensor properties

• Grant number: 19/12114-7
• Support Opportunities: Scholarships in Brazil - Master
• Start date: September 01, 2019
• End date: April 30, 2021
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Leinig Antonio Perazolli
• Grantee: Isabela Marcondelli Iani
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated research grant: 13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID

Abstract

Nanotubes of sodium titanates have been shown to be important materials for photocatalytic applications, initially studied by the IC-FAPESP project (process 2017/24405-0), and by preliminary tests in applications such as O2 gas sensor. This material shows promising for technological applications, such as photocatalytic or sensor, due to phenomena related to electronic structure, charge transport mechanisms and surface defect states, which, however, are still not well defined due to the complex stoichiometry (NaxH2-xTi3O7, 0 e x e 2). The main idea in this work is to improve the process of obtaining the particles through the hydrothermal-assisted microwave method (HAM), and to characterize its structural, optical, electronic, and morphological properties in relation to the compositional variation between H+ and Na+, stipulating experimentally the relationship between the hydrogen-titanate and sodium titanate phases (H2Ti6O13 and Na2Ti6O13). With this relation we intend to evaluate and control the formation of the morphology in nanotubes, as well as to improve and evaluate the photocatalytic and sensor applications. With defect states created, a reconstruction of the energy bands is expected to occur, retarding the electron recombination hole and increasing the photocatalytic efficiency of the material. In addition, it is sought to study conditions that provide increased selectivity and sensitivity with respect to the sensor property of O2 gas. The obtained materials will be characterized by spectroscopic, diffraction and microscopy techniques, besides the photocatalytic tests and sensors. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

IANI, ISABELA M.; TEODORO, VINICIUS; MARANA, NAIARA L.; COLETO JR, UBIRAJARA; SAMBRANO, JULIO R.; SIMOES, ALEXANDRE Z.; TEODORO, MARCIO D.; LONGO, ELSON; PERAZOLLI, LEINIG A.; AMORESI, RAFAEL A. C.; et al. Cation-exchange mediated synthesis of hydrogen and sodium titanates heterojunction: Theoretical and experimental insights toward photocatalyic mechanism. Applied Surface Science, v. 538, FEB 1 2021. (13/07296-2, 19/12430-6, 19/12114-7, 17/19143-7, 17/24405-0, 19/08928-9, 16/25500-4, 18/01914-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

IANI, Isabela Marcondelli. Sodium titanate nanomaterials: structure, morphology and photocatalytic properties. 2021. Master's Dissertation - Universidade Estadual Paulista (Unesp). Instituto de Química. Araraquara Araraquara.