CeO2 Nanoparticle Morphologies and Their Corresponding Crystalline Planes for the Photocatalytic Degradation of Organic Pollutants

Author(s)

Amoresi, Rafael A. C. ^[1] ; Oliveira, Regiane C. ^{[2, 1]} ; Marana, Naiara L. ^[2] ; de Almeida, Priscila B. ^[3] ; Prata, Paloma S. ^[4] ; Zaghete, Maria A. ^[5] ; Longo, Elson ^[3] ; Sambrano, Julio R. ^[2] ; Simoes, Alexandre Z. ^[1]

Affiliation

^[1] Sao Paulo State Univ, UNESP, Fac Engn Guaratingueta, BR-12516410 Guaratingueta, SP - Brazil

^[2] Sao Paulo State Univ, UNESP, Modeling & Mol Simulat Grp, BR-17033360 Bauru, SP - Brazil

^[3] Univ Fed Sao Carlos, UFSCar, Dept Chem, LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[4] Univ Fed Sao Carlos, UFSCar, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[5] Sao Paulo State Univ, UNESP, Inst Chem, LIEC, BR-14800060 Araraquara, SP - Brazil

• Document type: Journal article
• Source: ACS APPLIED NANO MATERIALS; v. 2, n. 10, p. 6513-6526, OCT 2019.
• Web of Science Citations: 0

Abstract

Currently, numerous properties of semiconducting oxides are correlated to their morphological characteristics resulting from their exposed surfaces. In the present work, the relationship between the following morphologies rod, bean, hexagon, and rod/cube of CeO2 with the exposure of (111), (110), (100), and (311) surfaces and the main charge carriers generated by the photochemical processes was investigated. This was done in regard to the degradation of ciprofloxacin and rhodamine-B. The initial stages of the degradation of the two types of molecules were evaluated, allowing the determination of where the charge carriers generated in the semiconductor preferentially acted on the molecules. Therefore, the active species in each photocatalyst were identified by scavenger tests and correlated to the computational simulations using the density functional theory. Accordingly, the relationships between the morphology, surface exposure in the particles, surface defects, photochemically generated species, and preferential attack on the micropollutant molecule were shown. Specific surface area analyses demonstrate an effective relationship between photocatalytic activity and the exposed surface of the particle. This will allow rationalization of the relation between the catalytic and electronic properties of semiconductor surfaces. (AU)

• FAPESP's process: 19/09296-6 - Femtosecond laser irradiation in CeO2 samples and advances in theoretical approach
• Grantee: Rafael Aparecido Ciola Amoresi
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 16/07476-9 - Porous nanotubes of carbon and inorganic semiconductors: a computational study
• Grantee: Julio Ricardo Sambrano
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/19143-7 - An experimental theoretical approach of conduction mechanisms and interface defects of heterostructure sensors based on P-N and N-N semiconductors from CeO2 matrices
• Grantee: Rafael Aparecido Ciola Amoresi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 16/25500-4 - Functionalization of semiconductor nanotubes via interfaces and gas adsorption: a computational approach
• Grantee: Naiara Letícia Marana
• Support Opportunities: Scholarships in Brazil - Post-Doctoral