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Paris EC, Malafatti JOD, Moreira AJ, Santos LC, Sciena CR, Zenatti A, Escote MT, Mastelaro VR, Joya MR. CuO nanoparticles decorated on hydroxyapatite/ferrite magnetic support: photocatalysis, cytotoxicity, and antimicrobial response. Environ Sci Pollut Res Int 2022; 29:41505-41519. [PMID: 35088254 DOI: 10.1007/s11356-021-18263-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 12/17/2021] [Indexed: 06/14/2023]
Abstract
Photocatalysts supported in magnetic nanocomposites for application in environmental remediation processes have been evaluated for removing contaminants due to easy recovery and low toxicity to the ecosystem. In this work, copper oxide (CuO) nanoparticles with photocatalytic properties were decorated on magnetic support constituted by hydroxyapatite (HAP) and ferrite to achieve efficiency in contaminated water remediation under visible light irradiation. First, nanomaterials were obtained by precipitation route, allowing fast and straightforward synthesis. Then, CuO nanoparticles with 6 nm diameter were efficiently decorated on magnetic support (25 nm), showing a high ability to absorb visible light irradiation (bandgap) to promote electronic transition and charge separation. Under visible irradiation, CuO promotes the H2O2 reduction in the conduction band (BC) to form hydroxyl radicals (•OH), which are responsible for rhodamine B (RhB) dye degradation (> 90% in 60 min). Magnetic hysteresis assays confirmed the magnetic properties of HAP/ferrite support, which enabled the recovery and reuse of the magnetic photocatalyst efficiently up to 3 cycles. Due to low Cu2+ leaching after the photocatalytic application stage, cytotoxicity assay for the Allium cepa seeds did not exhibit abnormal cells other than those commonly found. Furthermore, the CuO-decorated nanoparticles showed bactericidal activity against S. aureus (Gram-positive) and E. coli (Gram-negative) microorganisms, being more significant for the first one. Thus, the developed nanocomposite of CuO nanoparticles decorated on the magnetic support surface showed to be a complete system for water remediation, acting in contaminant degradation under visible light irradiation and bactericidal control with environmentally friendly characteristics.Graphical abstract CuO nanoparticles decorated on hydroxyapatite/ferrite magnetic support acting as a photocatalytic and bactericidal system.
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Affiliation(s)
- Elaine Cristina Paris
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, XV de Novembro St., 1452, São Carlos, SP, 13560-970, Brazil.
| | - João Otávio Donizette Malafatti
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, XV de Novembro St., 1452, São Carlos, SP, 13560-970, Brazil
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, km 235, zip code: 13565-905, São Carlos, SP, Brazil
| | - Ailton José Moreira
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, km 235, zip code: 13565-905, São Carlos, SP, Brazil
| | - Lílian Cruz Santos
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, XV de Novembro St., 1452, São Carlos, SP, 13560-970, Brazil
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, km 235, zip code: 13565-905, São Carlos, SP, Brazil
| | - Camila Rodrigues Sciena
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, XV de Novembro St., 1452, São Carlos, SP, 13560-970, Brazil
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, km 235, zip code: 13565-905, São Carlos, SP, Brazil
| | - Alessandra Zenatti
- Center for Engineering, Modeling, and Applied Social Sciences, Federal University of ABC, Avenida dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | - Márcia Tsuyama Escote
- Center for Engineering, Modeling, and Applied Social Sciences, Federal University of ABC, Avenida dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | | | - Miryam Rincón Joya
- Departamento de Física, Facultad de Ciencias, Universidad Nacional de Colombia-Bogota, Carrera 30 Calle 45-03, 111321, Bogota, Colombia
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Ruellas TMO, Peçanha LOO, Domingos GHS, Sciena CR, Malafatti JOD, Paris EC, Maestrelli SC, Giraldi TR. Zinc oxide pieces obtained by pressing and slip casting: physical, structural and photocatalytic properties. Environ Technol 2021; 42:1861-1873. [PMID: 31630636 DOI: 10.1080/09593330.2019.1683078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 10/15/2019] [Indexed: 06/10/2023]
Abstract
Photocatalysis is a promising alternative for the decontamination of effluents. In this paper, immobilized ZnO-based photocatalysts were obtained by pressing and by slip casting. The cylindrical pieces were heat-treated at 800°C. The samples were characterized by the method based on the principle of Archimedes, XRD, FTIR, Raman, diffuse reflectance and SEM. The samples obtained by slip casting presented lower apparent density (3.12 ± 0.04 g/cm3), higher apparent porosity (44.87 ± 0.47%) and smaller grain size (0.48 ± 0.05 µm) when compared to the pressed samples, with mean apparent density of 5.37 ± 0.08 g/cm3, apparent porosity of 1.56 ± 0.10% and grain size of 0.64 ± 0.02 µm. The performances of the samples were attested by the photocatalytic degradation of Rhodamine B (RhB) under UV-C irradiation (maximum intensity at 254 nm). The samples obtained by slip casting showed photocatalytic degradation between 80% and 90%, while the pressed samples showed degradation between 40% and 60%. The reuse of the photocatalysts was evaluated over five cycles of photocatalytic degradation, in which there was no loss of performance of the samples obtained by slip casting; however, the pressed samples showed a loss of photocatalytic efficiency starting from the third-cycle. Photocatalytic assays were carried out with different dye concentrations, in which the slip casting samples showed better photocatalytic efficiency (degradation of 80% for a RhB concentration of 10 mg/L) due to higher porosity and surface area compared to pressed samples, and there was a loss of performance in higher concentrations.
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Affiliation(s)
- T M O Ruellas
- Universidade Federal de Alfenas, Instituto de Ciência e Tecnologia, Cidade Universitária, Poços de Caldas, Brasil
| | - L O O Peçanha
- Universidade Federal de Alfenas, Instituto de Ciência e Tecnologia, Cidade Universitária, Poços de Caldas, Brasil
| | - G H S Domingos
- Universidade Federal de Alfenas, Instituto de Ciência e Tecnologia, Cidade Universitária, Poços de Caldas, Brasil
| | - C R Sciena
- Departamento de Química, Universidade Federal de São Carlos, Centro de Ciências Exatas e de Tecnologia, São Carlos, Brasil
| | - J O D Malafatti
- Departamento de Química, Universidade Federal de São Carlos, Centro de Ciências Exatas e de Tecnologia, São Carlos, Brasil
| | - E C Paris
- Empresa Brasileira de Pesquisa Agropecuária, Embrapa Instrumentação, São Carlos, Brasil
| | - S C Maestrelli
- Universidade Federal de Alfenas, Instituto de Ciência e Tecnologia, Cidade Universitária, Poços de Caldas, Brasil
| | - T R Giraldi
- Universidade Federal de Alfenas, Instituto de Ciência e Tecnologia, Cidade Universitária, Poços de Caldas, Brasil
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Paris EC, Malafatti JOD, Sciena CR, Junior LFN, Zenatti A, Escote MT, Moreira AJ, Freschi GPG. Nb 2O 5 nanoparticles decorated with magnetic ferrites for wastewater photocatalytic remediation. Environ Sci Pollut Res Int 2021; 28:23731-23741. [PMID: 33097995 DOI: 10.1007/s11356-020-11262-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 10/13/2020] [Indexed: 06/11/2023]
Abstract
Nanotechnology has been studied on environmental remediation processes to foster greater photocatalysts efficiency and reuse in wastewater. This study investigated the photocatalytic efficiency and viability of niobium pentoxide (Nb2O5) nanoparticles decorated with magnetic ferrite (cobalt ferrite (CoFe2O4) or magnesium ferrite (MgFe2O4)) for atrazine photodegradation. Thus, the decorated Nb2O5 was synthesized by the polymeric precursor method, forming nanoparticles with sizes ranging from 25 to 50 nm. Nanocomposite elementary analyses showed a homogeneous distribution of elements on all particles surface. Efficient magnetic saturation was observed for pure CoFe2O4 (53 emu g-1) and MgFe2O4 (19 emu g-1) nanoparticles, promoting the magnetic removal of Nb2O5:CoFe2O4 and Nb2O5:MgFe2O4 nanocomposites. Photocatalytic assays showed 88% efficiency for atrazine photodegradation with all nanomaterials, which represented a 21% increase compared to photolysis in the 1st cycle. The magnetic nanocomposites when applied to a 5th cycle maintained the atrazine photodegradation activity. In this way, magnetic Nb2O5-based nanocomposites decorated with ferrite nanoparticles showed an efficient photocatalytic response, in addition to posterior magnetic removal from the aqueous medium. Therefore, the evaluated magnetic Nb2O5 nanocomposites may be an alternative to enhance the wastewater removal process and foster the reuse in advanced oxidative processes.
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Affiliation(s)
- Elaine Cristina Paris
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, Rua XV de Novembro, 1452, CP 741, São Carlos, SP, 13560-970, Brazil.
| | - João Otávio Donizette Malafatti
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, Rua XV de Novembro, 1452, CP 741, São Carlos, SP, 13560-970, Brazil
- Department of Chemistry, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil
| | - Camila Rodrigues Sciena
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, Rua XV de Novembro, 1452, CP 741, São Carlos, SP, 13560-970, Brazil
- Department of Chemistry, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil
| | - Luiz Ferreira Neves Junior
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, Rua XV de Novembro, 1452, CP 741, São Carlos, SP, 13560-970, Brazil
- Department of Chemistry, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil
| | - Alessandra Zenatti
- Federal University of ABC (UFABC), Av. dos Estados, 5001, Santo André, SP, 09210-170, Brazil
| | - Márcia Tsuyama Escote
- Federal University of ABC (UFABC), Av. dos Estados, 5001, Santo André, SP, 09210-170, Brazil
| | - Ailton José Moreira
- Department of Chemistry, Federal University of São Carlos, Via Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil
| | - Gian Paulo Giovanni Freschi
- Instituto de Ciência e Tecnologia, Federal University of Alfenas, Rod. José Aurélio Vilela, km 533, Poços de Caldas, MG, 37715-400, Brazil
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