resumo
A defect engineering strategy is employed to produce defective calcium-doped TiO2 nanomaterials (Ca:TiO2), which are subsequently incorporated into cellulose-based membranes. Structural defects, including vacancies, stacking faults, grain boundaries and voids emerged from the interplay between calcium doping and microwave irradiation. The 10 mol.% Ca:TiO2 membrane achieves an 81% degradation rate and an adsorption capacity of approximate to 25.8 mg g-1, showcasing excellent photocatalytic and adsorption performance. The enhanced performance is attributed to the high surface area of Ca:TiO2 agglomerates, the presence of oxygen vacancies, structural defects and the abundance of surface hydroxyl groups. X-ray Photoelectron Spectroscopy (XPS) revealed that the Fermi level of the 10 mol.% Ca:TiO2 nanomaterial is positioned near the conduction band edge, indicating a significant modification of its electronic properties, with high electrical conductivity at room temperature (RT). Density Functional Theory (DFT) calculations provided a deeper insight into the impact of calcium doping, revealing that calcium (Ca) incorporation promotes the formation of oxygen vacancies, introducing additional electronic states near the bottom of the conduction band, thereby enhancing the material's electrical conductivity. By integrating eco-friendly materials and defect-engineered nanomaterials doped with earth-abundant elements, this work aligns with sustainability principles, fostering the development of next-generation adsorptive and photocatalytic membranes.
palavras-chave
TIO2 PHOTOCATALYSTS; DOPED TIO2; MICROWAVE SYNTHESIS; TEXTURAL PROPERTIES; LATTICE DISTORTION; OXYGEN VACANCIES; CONGO RED; REMOVAL; PAPER; NANOPARTICLES
categoria
Science & Technology - Other Topics; Materials Science
autores
Matias, ML; Gaspar, D; Carvalho, D; Pimentel, A; Pereira, L; Machado, ASR; Rodrigues, J; Monteiro, T; Gouveia, JD; Carvalho, PA; Deuermeier, J; Martins, R; Fortunato, E; Nunes, D
nossos autores
José Daniel Lago da Silva Neves Gouveia
Investigador AuxiliarProjectos
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
Nano-argilas para remoção/captura de fosfatos (P) e sua reutilização como fertilizante (NATURAL)
agradecimentos
National Funds from FCT - Fundac & atilde;o para a Ciencia e a Tecnologia, I.P., supported this work through the projects UIDB/50025/2020-2023, UIDP/50025/2020-2023, LA/0037/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodelling and Nanofabrication-i3N. The authors were also thankful to FCT for the essential financial support under project references UIDB/04138/2020, UIDP/04138/2020 and UIDB/00645/2020. Part of this work was supported by an AdG from ERC through the DIGISMART project (787410). M.L. Matias would like to thank FCT for the Ph.D. scholarship UI/BD/151292/2021. J. Rodrigues acknowledges FCT for Program Stimulus of Scientific Employment-Individual Support (grant 2022.00010.CEECIND/CP1720/CT0023), CEECINSTLA/00005/2022 and 2023.00054.RESTART. J. Deuermeier also thanks FCT for the FCT Scientific Employment Stimulus - Institutional Call (CEECINST/00102/2018) contract. A. S. Reis Machado also acknowledges the support by the FCT project "CO2RED" (reference: PTDC/EQU-EPQ/2195/2021). Acknowledgments were also extended to the EC project SYNERGY H2020-WIDESPREAD-2020-5, CSA, proposal no. 952169 and to EMERGE-2020-INFRAIA-2020-1, proposal no. 101008701. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) & LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). J. D. Gouveia acknowledges the FCT grant 2023.06511.CEECIND, in the scope of the Individual Call to Scientific Employment Stimulus - 6th Edition. The authors were thankful to the Sustainable Stone project by Portugal - Valorization of Natural Stone for a digital, sustainable, and qualified future, numbered 40, proposal number C644943391-00000051, which was co-financed by the PRR - Recovery and Resilience Plan of the European Union (Next Generation EU).