1
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Psathas P, Zindrou A, Spyrou AV, Deligiannakis Y. Engineering of LiTaO 3 Nanoparticles by Flame Spray Pyrolysis: Understanding In Situ Li-Incorporation into the Ta 2O 5 Lattice. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1257. [PMID: 39120362 PMCID: PMC11314277 DOI: 10.3390/nano14151257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2024] [Revised: 07/15/2024] [Accepted: 07/25/2024] [Indexed: 08/10/2024]
Abstract
Lithium tantalate (LiTaO3) perovskite finds wide use in pyroelectric detectors, optical waveguides and piezoelectric transducers, stemming from its good mechanical and chemical stability and optical transparency. Herein, we present a method for synthesis of LiTaO3 nanoparticles using a scalable Flame Spray Pyrolysis (FSP) technology, that allows the formation of LiTaO3 nanomaterials in a single step. Raman, XRD and TEM studies allow for comprehension of the formation mechanism of the LiTaO3 nanophases, with particular emphasis on the penetration of Li atoms into the Ta-oxide lattice. We show that, control of the High-Temperature Particle Residence Time (HTPRT) in the FSP flame, is the key-parameter that allows successful penetration of the -otherwise amorphous- Li phase into the Ta2O5 nanophase. In this way, via control of the HTPRT in the FSP process, we synthesized a series of nanostructured LiTaO3 particles of varying phase composition from {amorphous Li/Ta2O5/LiTaO3} to {pure LiTaO3, 15-25 nm}. Finally, the photophysical activity of the FSP-made LiTaO3 was validated for photocatalytic H2 production from H2O. These data are discussed in conjunction with the role of the phase composition of the LiTaO3 nanoparticles. More generally, the present work allows a better understanding of the mechanism of ABO3 perovskite formation that requires the incorporation of two cations, A and B, into the nanolattice.
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Affiliation(s)
| | | | | | - Yiannis Deligiannakis
- Laboratory of Physical Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45110 Ioannina, Greece; (P.P.); (A.Z.); (A.V.S.)
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2
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Liu S, Wang H, Hu Z, Zhang X, Sun Y, Dong F. Resolving the overlooked photochemical nitrophenol transformation mechanism induced by nonradical species under visible light. Proc Natl Acad Sci U S A 2024; 121:e2401452121. [PMID: 39018193 PMCID: PMC11287141 DOI: 10.1073/pnas.2401452121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 06/04/2024] [Indexed: 07/19/2024] Open
Abstract
Nitrophenols present on the surface of particulates are ubiquitous in the atmosphere. However, its atmospheric photochemical transformation pathway remains unknown, for which the crucial effect of visible light is largely overlooked, resulting in an incomplete understanding of the effects of nitrophenols in the atmospheric environment. This study delves into the photolysis mechanism of 4-nitrophenol (4NP), one of the most abundant atmospheric nitrophenol compounds, on the surface of photoactive particulates under visible light irradiation. Unexpectedly, the nonradical species (singlet oxygen, 1O2) was identified as a dominant factor in driving the visible photolysis of 4NP. The pathways of HONO and p-benzoquinone (C6H4O2) generation were clarified by acquiring direct evidence of C-N and O-H bond breakage in the nitro (-NO2) and hydroxyl (-OH) groups of 4NP. The further decomposition of HONO results in the generation of NO and hydroxyl radicals, which could directly contribute to atmospheric oxidizing capacity and complicate the PM2.5 composition. Significantly, the behavior of 1O2-induced visible photolysis of 4NP was universal on the surface of common particulates in the atmosphere, such as A1 dust and Fe2O3. This work advances the understanding of the photochemical transformation mechanism of particulate-phase atmospheric nitrophenols, which is indispensable in elucidating the role of nitrophenols in atmospheric chemistry.
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Affiliation(s)
- Shujun Liu
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Hong Wang
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Zehui Hu
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Xin Zhang
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Yanjuan Sun
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu611731, China
| | - Fan Dong
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu611731, China
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3
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Kuźniarska-Biernacka I, Garbarz-Glos B, Skiba E, Maniukiewicz W, Monteiro M, Bąk W, Szydłowski D, Freire C. Catalytic Transformation of Nitroarenes to Amines over Ba (1-x)Sr xTiO 3 (0 < x < 1) Perovskites in Water. Molecules 2024; 29:1416. [PMID: 38611697 PMCID: PMC11012675 DOI: 10.3390/molecules29071416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 03/09/2024] [Accepted: 03/19/2024] [Indexed: 04/14/2024] Open
Abstract
This work is focused on the application of lanthanide-free perovskite Ba1-xSrxTiO3 (0 < x < 1) in valorization of toxic pollutants as 4-nitrophenol (4-NPh). The series of perovskites were fabricated by facile, one-step solid-state preparation method and characterized via various techniques: elemental analysis (Inductively Coupled Plasma Optical Emission Spectrometry, ICP-OES), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and dielectric properties (impedance spectroscopy, IS). The methods confirmed the assumed composition, structure and high purity of the materials. The results showed that substitution of Ba2+ by Sr2+ in the perovskite crystal lattice influenced the dielectric properties of samples and the size of the grains. The absorption and catalytic properties of Ba(1-x)SrxTiO3 (0 < x < 1) series were evaluated in reduction of 4-NPh in water using NaBH4 as reducing agent. No adsorption of 4-NPh was found for all the materials during 180 min of contact (experiment without reducing agent), and the best catalytic performance was found for the Ba(1-x)SrxTiO3 (x = 0.3) sample. The catalytic transformation of 4-NPh to 4-APh follows a pseudo-first-order model, and the catalysts can be easily regenerated via mild annealing (300 °C).
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Affiliation(s)
- Iwona Kuźniarska-Biernacka
- REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciencias, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal; (M.M.); (C.F.)
| | - Barbara Garbarz-Glos
- Institute of Technology, University of the National Education Commission, Podchorążych 2, 30-084 Kraków, Poland;
| | - Elżbieta Skiba
- Institute of General and Ecological Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland; (E.S.); (W.M.)
| | - Waldemar Maniukiewicz
- Institute of General and Ecological Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland; (E.S.); (W.M.)
| | - Marta Monteiro
- REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciencias, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal; (M.M.); (C.F.)
| | - Wojciech Bąk
- Institute of Technology, University of the National Education Commission, Podchorążych 2, 30-084 Kraków, Poland;
| | - Dariusz Szydłowski
- Evidence Law and Forensic Technology, University of the National Education Commission, Podchorążych 2, 30-084 Kraków, Poland;
| | - Cristina Freire
- REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciencias, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal; (M.M.); (C.F.)
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4
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Sahoo B, Sahoo PK, Rao Bhaviripudi V, Sahu KC, Tripathi A, Sahoo NK, Aepuru R, Gaikwad VM, Sahoo S, Satpati AK, Lee CP. Multifunctional Dy 2NiMnO 6/Reduced Graphene Oxide Nanocomposites and Their Catalytic, Electromagnetic Shielding, and Electrochemical Properties. ACS OMEGA 2024; 9:4600-4612. [PMID: 38313538 PMCID: PMC10832015 DOI: 10.1021/acsomega.3c07759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/25/2023] [Accepted: 12/29/2023] [Indexed: 02/06/2024]
Abstract
Multifunctional nanocomposites have shown great interest in clean energy systems and environmental applications in recent years. Herein, we first reported the synthesis of Dy2NiMnO6 (DNMO)/reduced graphene oxide (rGO) nanocomposites utilizing a hybrid approach involving sol-gel and solvothermal processes. Subsequently, we investigated these nanocomposites for their applications in catalysis, electromagnetic interference shielding, and supercapacitors. A morphological study suggests spherical-shaped DNMO nanoparticles of an average size of 382 nm that are uniformly distributed throughout the surface without any agglomeration. The as-prepared nanocomposites were used as catalysts to investigate the catalytic reduction of 4-nitrophenol in the presence of NaBH4. DNMO/rGO nanocomposites demonstrate superior catalytic activity when compared with bare DNMO, with the rate of reduction being influenced by the composition of the DNMO/rGO nanocomposites. In addition, novel multifunctional DNMO/rGO was incorporated into polyvinylidene difluoride (PVDF) to develop a flexible nanocomposite for electromagnetic shielding applications and exhibited a shielding effectiveness of 6 dB with 75% attenuation at a frequency of 8.5 GHz compared to bare PVDF and PVDF-DNMO nanocomposite. Furthermore, the electrochemical performance of DNMO/rGO nanocomposites was investigated as an electrode material for supercapacitors, exhibiting the highest specific capacitance of 260 F/g at 1 A/g. These findings provide valuable insights into the design of DNMO/rGO nanocomposites with remarkable performance in sustainable energy and environmental applications.
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Affiliation(s)
- Bibhuti
Bhusan Sahoo
- Department
of Mechanical Engineering, Siksha “O”
Anusandhan, Deemed to Be University, Bhubaneswar, Odisha 751030, India
| | - Prasanta Kumar Sahoo
- Department
of Mechanical Engineering, Siksha “O”
Anusandhan, Deemed to Be University, Bhubaneswar, Odisha 751030, India
- Environmental
Hydrology Division, National Institute of Hydrology, Jalvigyan Bhawan, Roorkee 247667, India
| | - Vijayabhaskara Rao Bhaviripudi
- Department
of Physics, Defence Institute of Advanced
Technology, Girinagar, Pune, Maharashtra 411025, India
- Departamento
de Ingeniería Química, Biotecnología y Materiales,
FCFM, Universidad de Chile, Santiago 8370415, Chile
| | - Krushna Chandra Sahu
- Department
of Chemistry, Siksha ‘O’ Anusandhan,
Deemed to be University, Bhubaneswar, Odisha 751030, India
| | - Abhishek Tripathi
- Department
of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur 302017, India
| | - Naresh Kumar Sahoo
- Department
of Chemistry, Siksha ‘O’ Anusandhan,
Deemed to be University, Bhubaneswar, Odisha 751030, India
| | - Radhamanohar Aepuru
- Departamento
de Mecanica, Facultad de Ingeniería, Universidad Tecnológica Metropolitana, Santiago 7800002, Chile
| | - Vishwajit M. Gaikwad
- Department
of Physics, Amolakchand Mahavidyalaya, Yavatmal, Maharashtra 445001, India
| | - Srikant Sahoo
- Analytical
Chemistry Division, Bhabha Atomic Research
Centre, Trombay, Mumbai 400085, India
| | - Ashis Kumar Satpati
- Analytical
Chemistry Division, Bhabha Atomic Research
Centre, Trombay, Mumbai 400085, India
| | - Chuan-Pei Lee
- Department
of Applied Physics and Chemistry, University
of Taipei, Taipei 10048, Taiwan
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5
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Dimitriou C, Psathas P, Solakidou M, Deligiannakis Y. Advanced Flame Spray Pyrolysis (FSP) Technologies for Engineering Multifunctional Nanostructures and Nanodevices. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:3006. [PMID: 38063702 PMCID: PMC10707979 DOI: 10.3390/nano13233006] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/21/2023] [Accepted: 11/21/2023] [Indexed: 09/06/2024]
Abstract
Flame spray pyrolysis (FSP) is an industrially scalable technology that enables the engineering of a wide range of metal-based nanomaterials with tailored properties nanoparticles. In the present review, we discuss the recent state-of-the-art advances in FSP technology with regard to nanostructure engineering as well as the FSP reactor setup designs. The challenges of in situ incorporation of nanoparticles into complex functional arrays are reviewed, underscoring FSP's transformative potential in next-generation nanodevice fabrication. Key areas of focus include the integration of FSP into the technology readiness level (TRL) for nanomaterials production, the FSP process design, and recent advancements in nanodevice development. With a comprehensive overview of engineering methodologies such as the oxygen-deficient process, double-nozzle configuration, and in situ coatings deposition, this review charts the trajectory of FSP from its foundational roots to its contemporary applications in intricate nanostructure and nanodevice synthesis.
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Affiliation(s)
| | | | | | - Yiannis Deligiannakis
- Laboratory of Physical Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45110 Ioannina, Greece
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6
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Kallaev S, Sadykov S, Pavlenko A, Ataev M, Majzner J, Orudzhev F, Giraev K, Alikhanov N. Exploring RF Magnetron Sputtering Growth Composite Thin Film BiFeO 3-Bi 2Fe 4O 9 on C-Plane Al 2O 3 Substrate. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6987. [PMID: 37959586 PMCID: PMC10647479 DOI: 10.3390/ma16216987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 10/28/2023] [Accepted: 10/30/2023] [Indexed: 11/15/2023]
Abstract
Nanocomposite films of BiFeO3-Bi2Fe4O9 were fabricated on a sapphire substrate Al2O3 using the method of gas discharge high-frequency cathodic sputtering of a ceramic target with a stoichiometric composition in an oxygen atmosphere. The results of the film analysis using X-ray structural analysis, Raman scattering, XPS, and atomic force microscopy are presented. The lattice parameters, surface topography, chemical composition of the films, concentration, and average sizes of the crystallites for each phase were determined. It was shown that the ratio of the BiFeO3 to Bi2Fe4O9 phases in the obtained film is approximately 1:2. The sizes of the crystallites range from 15 to 17 nm. The optical and magnetic properties of the nanocomposite layers were studied, and the band gap width and magnetization hysteresis characteristic of ferromagnetic behavior were observed. The band gap width was found to be 1.9 eV for the indirect and 2.6 eV for the direct interband transitions. The magnetic properties are characterized by a hysteresis loop resembling a "wasp-waist" shape, indicating the presence of magnetic anisotropy.
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Affiliation(s)
- Suleiman Kallaev
- Amirkhanov Institute of Physics, Dagestan Federal Research Center, Russian Academy of Sciences, St. M. Yaragskogo 94, 367003 Makhachkala, Russia
| | - Sadyk Sadykov
- Amirkhanov Institute of Physics, Dagestan Federal Research Center, Russian Academy of Sciences, St. M. Yaragskogo 94, 367003 Makhachkala, Russia
- Physical Department, Dagestan State University, St. M. Gadjieva 43-a, 367015 Makhachkala, Russia
| | - Anatoly Pavlenko
- Federal Research Centre “The Southern Scientific Centre”, Russian Academy of Sciences, 344006 Rostov-on-Don, Russia
| | - Mansur Ataev
- Amirkhanov Institute of Physics, Dagestan Federal Research Center, Russian Academy of Sciences, St. M. Yaragskogo 94, 367003 Makhachkala, Russia
| | - Jiří Majzner
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 61600 Brno, Czech Republic
| | - Farid Orudzhev
- Amirkhanov Institute of Physics, Dagestan Federal Research Center, Russian Academy of Sciences, St. M. Yaragskogo 94, 367003 Makhachkala, Russia
| | - Kamal Giraev
- Physical Department, Dagestan State University, St. M. Gadjieva 43-a, 367015 Makhachkala, Russia
| | - Nariman Alikhanov
- Amirkhanov Institute of Physics, Dagestan Federal Research Center, Russian Academy of Sciences, St. M. Yaragskogo 94, 367003 Makhachkala, Russia
- Physical Department, Dagestan State University, St. M. Gadjieva 43-a, 367015 Makhachkala, Russia
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7
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Saddique Z, Imran M, Javaid A, Latif S, Kim TH, Janczarek M, Bilal M, Jesionowski T. Bio-fabricated bismuth-based materials for removal of emerging environmental contaminants from wastewater. ENVIRONMENTAL RESEARCH 2023; 229:115861. [PMID: 37062477 DOI: 10.1016/j.envres.2023.115861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 04/04/2023] [Accepted: 04/05/2023] [Indexed: 05/21/2023]
Abstract
Although rapid industrialization has made life easier for humans, several associated issues are emerging and harming the environment. Wastewater is regarded as one of the key problems of the 21st century due to its massive production every year and requires immediate attention from all stakeholders to protect the environment. Since the introduction of nanotechnology, bismuth-based nanomaterials have been used in variety of applications. Various techniques, such as hydrothermal, solvo-thermal and biosynthesis, have been reported for synthesizing these materials, etc. Among these, biosynthesis is eco-friendly, cost-effective, and less toxic than conventional chemical methods. The prime focuses of this review are to elaborate biosynthesis of bismuth-based nanomaterials via bio-synthetic agents such as plant, bacteria and fungi and their application in wastewater treatment as anti-pathogen/photocatalyst for pollutant degradation. Besides this, future perspectives have been presented for the upcoming research in this field, along with concluding remarks.
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Affiliation(s)
- Zohaib Saddique
- Centre for Inorganic Chemistry, School of Chemistry, University of the Punjab Lahore, 54000, Pakistan
| | - Muhammad Imran
- Centre for Inorganic Chemistry, School of Chemistry, University of the Punjab Lahore, 54000, Pakistan.
| | - Ayesha Javaid
- Centre for Inorganic Chemistry, School of Chemistry, University of the Punjab Lahore, 54000, Pakistan
| | - Shoomaila Latif
- School of Physical Sciences, University of the Punjab, Lahore, 54000, Pakistan
| | - Tak H Kim
- School of Environment and Science, Griffith University, 170 Kessels Road, Nathan, QLD, 4111, Australia
| | - Marcin Janczarek
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965, Poznan, Poland
| | - Muhammad Bilal
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965, Poznan, Poland
| | - Teofil Jesionowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965, Poznan, Poland.
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8
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Psathas P, Zindrou A, Papachristodoulou C, Boukos N, Deligiannakis Y. In Tandem Control of La-Doping and CuO-Heterojunction on SrTiO 3 Perovskite by Double-Nozzle Flame Spray Pyrolysis: Selective H 2 vs. CH 4 Photocatalytic Production from H 2O/CH 3OH. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13030482. [PMID: 36770444 PMCID: PMC9920848 DOI: 10.3390/nano13030482] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/19/2023] [Accepted: 01/21/2023] [Indexed: 06/12/2023]
Abstract
ABO3 perovskites offer versatile photoactive nano-templates that can be optimized towards specific technologies, either by means of doping or via heterojunction engineering. SrTiO3 is a well-studied perovskite photocatalyst, with a highly reducing conduction-band edge. Herein we present a Double-Nozzle Flame Spray Pyrolysis (DN-FSP) technology for the synthesis of high crystallinity SrTiO3 nanoparticles with controlled La-doping in tandem with SrTiO3/CuO-heterojunction formation. So-produced La:SrTiO3/CuO nanocatalysts were optimized for photocatalysis of H2O/CH3OH mixtures by varying the La-doping level in the range from 0.25 to 0.9%. We find that, in absence of CuO, the 0.9La:SrTiO3 material achieved maximal efficient photocatalytic H2 production, i.e., 12 mmol g-1 h-1. Introduction of CuO on La:SrTiO3 enhanced selective production of methane CH4. The optimized 0.25La:SrTiO3/0.5%CuO catalyst achieved photocatalytic CH4 production of 1.5 mmol g-1 h-1. Based on XRD, XRF, XPS, BET, and UV-Vis/DRS data, we discuss the photophysical basis of these trends and attribute them to the effect of La atoms in the SrTiO3 lattice regarding the H2-production, plus the effect of interfacial CuO on the promotion of CH4 production. Technology-wise this work is among the first to exemplify the potential of DN-FSP for scalable production of complex nanomaterials such as La:SrTiO3/CuO with a diligent control of doping and heterojunction in a single-step synthesis.
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Affiliation(s)
- Pavlos Psathas
- Department of Physics, University of Ioannina, 45110 Ioannina, Greece
| | - Areti Zindrou
- Department of Physics, University of Ioannina, 45110 Ioannina, Greece
| | | | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology (INN), NCSR Demokritos, 15310 Athens, Greece
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9
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Das K, Bariki R, Pradhan SK, Majhi D, Dash P, Mishra A, Dhiman R, Nayak B, Mishra BG. Boosting the photocatalytic performance of Bi 2Fe 4O 9 through formation of Z-scheme heterostructure with In 2S 3: Applications towards water decontamination. CHEMOSPHERE 2022; 306:135600. [PMID: 35809748 DOI: 10.1016/j.chemosphere.2022.135600] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 06/18/2022] [Accepted: 07/01/2022] [Indexed: 06/15/2023]
Abstract
Design of biocompatible nano-heterostructure photocatalyst with broad UV-visible spectrum response and strong redox ability is a promising approach with potential application in micropollutant degradation and pathogen deactivation from aqueous sources. Herein, we have reported the facile fabrication of In2S3/Bi2Fe4O9 (ISxBFO) binary heterostructure by hydrothermally depositing In2S3 nanoparticles (20-40 nm) over Bi2Fe4O9 nanocuboids/nanoplates prepared by combustion synthesis route. In depth characterization study revealed broad spectrum UV-Vis absorption, large interfacial contact, improved charge carrier separation and mobility and a longer excited state life time (4.7 ns) for the ISxBFO heterostructure materials. The integration of In2S3 with Bi2Fe4O9 strongly boosts the optoelectrical and photocatalytic property of pristine Bi2Fe4O9. The ISxBFO heterostructure material exhibited enhanced photocatalytic efficiency for aqueous phase degradation of sulfamethoxazole antibiotics (kapp = 0.06 min-1) and phenyl urea herbicides (kapp = 0.028 min-1) with reaction rates 3-8 times higher than the pure BFO component. The MTT assay experiments confirmed non-cytotoxic nature of treated sulfamethoxazole and diuron solutions. The composite materials also displayed convincing antibacterial behavior towards toxigenic Vibrio cholerae pathogen. Haemagglutination assay study revealed excellent biocompatibility of the binary composite up to 200 mg L-1. Radical trapping study suggested expeditious generation of •OH and •O2- radicals over the ISxBFO surface which is nearly 3.8 and 2.3 times higher than pure BFO and In2S3 respectively. The occurrence of a direct Z-scheme mechanism is inferred from radical trapping and XPS study which accounted for the improved photocatalytic activity and strong radical generation property of the ISxBFO heterostructure material.
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Affiliation(s)
- Krishnendu Das
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Ranjit Bariki
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Sibun Kumar Pradhan
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Dibyananda Majhi
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Priyanka Dash
- Department of Life Science, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Abtar Mishra
- Department of Life Science, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Rohan Dhiman
- Department of Life Science, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Bismita Nayak
- Department of Life Science, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - B G Mishra
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India.
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10
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Mhlwatika Z, Bingwa N. Kinetic evaluation of perovskites-type catalysts in the reduction of 4-nitrophenol: A mechanistic elucidation study. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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11
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Moularas C, Psathas P, Deligiannakis Y. Electron paramagnetic resonance study of photo-induced hole/electron pairs in NaTaO3 nanoparticles. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.139031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Preparation of Y3+ and transition metal ions codoped-BiFeO3 with enhanced magnetism and photocatalytic properties. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Belles L, Moularas C, Smykała S, Deligiannakis Y. Flame Spray Pyrolysis Co 3O 4/CoO as Highly-Efficient Nanocatalyst for Oxygen Reduction Reaction. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:925. [PMID: 33916435 PMCID: PMC8066371 DOI: 10.3390/nano11040925] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/23/2021] [Accepted: 04/01/2021] [Indexed: 12/30/2022]
Abstract
The oxygen reduction reaction (ORR) is the rate-limiting reaction in the cathode side of fuel cells. In the quest for alternatives to Pt-electrodes as cathodes in ORR, appropriate transition metal oxide-based electrocatalysts are needed. In the present work, we have synthesized Co3O4 and CoO/Co3O4 nanostructures using flame spray pyrolysis (FSP), as electrocatalysts for ORR in acidic and alkaline media. A detailed study of the effect of (Co-oxide)/Pt ratio on ORR efficiency shows that the present FSP-made Co-oxides are able to perform ORR at very low-Pt loading, 0.4% of total metal content. In acid medium, an electrode with (5.2% Pt + 4.8% Co3O4), achieved the highest ORR performance (Jmax = 8.31 mA/cm2, E1/2 = 0.66 V). In alkaline medium, superior performance and stability have been achieved by an electrode with (0.4%Pt + 9.6% (CoO/Co3O4)) with ORR activity (Jmax = 3.5 mA/cm2, E1/2 = 0.08 V). Using XRD, XPS, Raman and TEM data, we discuss the structural and electronic aspects of the FSP-made Co-oxide catalysts in relation to the ORR performance. Cyclic voltammetry data indicate that the ORR process involves active sites associated with Co3+ cations at the cobalt oxide surface. Technology-wise, the present work demonstrates that the developed FSP-protocols, constitutes a novel scalable process for production of co-oxides appropriate for oxygen reduction reaction electrodes.
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Affiliation(s)
- Loukas Belles
- Laboratory of Physics Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45550 Ioannina, Greece; (L.B.); (C.M.)
| | - Constantinos Moularas
- Laboratory of Physics Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45550 Ioannina, Greece; (L.B.); (C.M.)
| | - Szymon Smykała
- Institute of Engineering Materials and Biomaterials, Silesian University of Technology, 18a Konarskiego St, 44-100 Gliwice, Poland;
| | - Yiannis Deligiannakis
- Laboratory of Physics Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45550 Ioannina, Greece; (L.B.); (C.M.)
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Stathi P, Solakidou M, Deligiannakis Y. Lattice Defects Engineering in W-, Zr-doped BiVO 4 by Flame Spray Pyrolysis: Enhancing Photocatalytic O 2 Evolution. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:501. [PMID: 33669461 PMCID: PMC7920441 DOI: 10.3390/nano11020501] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/03/2021] [Accepted: 02/07/2021] [Indexed: 12/03/2022]
Abstract
A flame spray pyrolysis (FSP) method has been developed, for controlled doping of BiVO4 nanoparticles with W and Zr in tandem with the oxygen vacancies (Vo) of the BiVO4 lattice. Based on XPS and Raman data, we show that the nanolattice of W-BiVO4 and Zr-BiO4 can be controlled to achieve optimal O2 evolution from H2O photocatalysis. A synergistic effect is found between the W- and Zr-doping level in correlation with the Vo-concentration. FSP- made W-BiVO4 show optimal photocatalytic O2-production from H2O, up to 1020 μmol/(g × h) for 5%W-BiVO4, while the best performing Zr-doped achieved 970 μmol/(g × h) for 5%Zr-BiVO4. Higher W-or Zr-doping resulted in deterioration in photocatalytic O2-production from H2O. Thus, engineering of FSP-made BiVO4 nanoparticles by precise control of the lattice and doping-level, allows significant enhancement of the photocatalytic O2-evolution efficiency. Technology-wise, the present work demonstrates that flame spray pyrolysis as an inherently scalable technology, allows precise control of the BiVO4 nanolattice, to achieve significant improvement of its photocatalytic efficiency.
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Affiliation(s)
| | | | - Yiannis Deligiannakis
- Laboratory of Physics Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45110 Ioannina, Greece; (P.S.); (M.S.)
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