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Physicochemical properties of TIO2, ZrO2, Fe3O4 nanocrystalline adsorbents and photocatalysts. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02433-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Effect of Calcination Conditions on the Properties and Photoactivity of TiO2 Modified with Biuret. Catalysts 2021. [DOI: 10.3390/catal11121546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A simple wet impregnation-calcination method was used to obtain a series of novel non-metal doped TiO2 photocatalysts. Biuret was applied as C and N source, while raw titanium dioxide derived from sulfate technology process was used as TiO2 and S source. The influence of the modification with biuret and the effect of the atmosphere (air or argon) and temperature (500–800 °C) of calcination on the physicochemical properties and photocatalytic activity of the photocatalysts towards ketoprofen decomposition under simulated solar light was investigated. Moreover, selected photocatalysts were applied for ketoprofen photodecomposition under visible and UV irradiation. Crucial features affecting the photocatalytic activity were the anatase to rutile phase ratio, anatase crystallites size and non-metals content. The obtained photocatalysts revealed improved activity in the photocatalytic ketoprofen decomposition compared to the crude TiO2. The best photoactivity under all irradiation types exhibited the photocatalyst calcined in the air atmosphere at 600 °C, composed of 96.4% of anatase with 23 nm crystallites, and containing 0.11 wt% of C, 0.05 wt% of N and 0.77 wt% of S.
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Chandrasekaran S, Zhang C, Shu Y, Wang H, Chen S, Nesakumar Jebakumar Immanuel Edison T, Liu Y, Karthik N, Misra R, Deng L, Yin P, Ge Y, Al-Hartomy OA, Al-Ghamdi A, Wageh S, Zhang P, Bowen C, Han Z. Advanced opportunities and insights on the influence of nitrogen incorporation on the physico-/electro-chemical properties of robust electrocatalysts for electrocatalytic energy conversion. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214209] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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de Campos MBM, Cebim MA, Meirelles MR, Paris EC, Rosa AH. Influence of terbium (III) ions on the photocatalytic activity of TiO 2 and CeO 2 for the degradation of methylene blue in industrial effluents. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:27147-27161. [PMID: 33502707 DOI: 10.1007/s11356-021-12571-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
This study reports the preparation of TiO2 and CeO2 doped with different quantities of terbium and discusses the influence of this dopant on the photocatalytic activity of the semiconductors, with respect to the degradation of methylene blue, under ultraviolet and solar radiations. The oxides obtained were characterized by X-ray diffraction, infrared vibrational spectroscopy, diffuse reflectance spectroscopy, scanning electron microscopy, and dispersive energy spectroscopy. The results indicate that the presence of the dopant in TiO2 favored the formation of the anatase crystalline phase to the detriment of rutile, increased the band gap energy, and decreased the size of the nanoparticles. Doping CeO2 with Tb resulted in a fluorite-type crystalline structure, reduced band gap, and smaller particle size. The photocatalytic activity decreases as the concentration of terbium increases regardless of the radiation source and nature of the oxide. Furthermore, a better performance was observed for all semiconductors excited by solar radiation in comparison to ultraviolet light. The samples of pure TiO2 and TiO2 doped with 0.5 and 1% terbium showed total removal of the dye after less than 120 min of reaction, while the samples of pure CeO2 and CeO2 doped with 0.5% terbium showed approximately 80% and 57% of dye removal after 120 min, suggesting that these materials can be promising for the treatment of industrial effluents.
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Affiliation(s)
- Mariana Bizari Machado de Campos
- Sao Paulo State University (Unesp), Institute of Science and Technology, Sorocaba, 511 Três de Março Avenue, Sorocaba, SP, 18087-180, Brazil.
- Federal Institute of Education, Science and Technology of São Paulo (IFSP), Campus São Roque, 2100 Major Quintino de Lima Highway, São Roque, SP, 18145-090, Brazil.
| | - Marco Aurélio Cebim
- Sao Paulo State University (Unesp), Institute of Chemistry, Araraquara, 55 Prof. Francisco Degni Avenue, Araraquara, SP, 14800-900, Brazil
| | - Mariana Rodrigues Meirelles
- National Nanotechnology Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 1452 XV de Novembro Street, São Carlos, SP, 13560-970, Brazil
| | - Elaine Cristina Paris
- National Nanotechnology Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 1452 XV de Novembro Street, São Carlos, SP, 13560-970, Brazil
| | - André Henrique Rosa
- Sao Paulo State University (Unesp), Institute of Science and Technology, Sorocaba, 511 Três de Março Avenue, Sorocaba, SP, 18087-180, Brazil
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Abstract
This article presents an overview of the reports on the doping of TiO2 with carbon, nitrogen, and sulfur, including single, co-, and tri-doping. A comparison of the properties of the photocatalysts synthesized from various precursors of TiO2 and C, N, or S dopants is summarized. Selected methods of synthesis of the non-metal doped TiO2 are also described. Furthermore, the influence of the preparation conditions on the doping mode (interstitial or substitutional) with reference to various types of the modified TiO2 is summarized. The mechanisms of photocatalysis for the different modes of the non-metal doping are also discussed. Moreover, selected applications of the non-metal doped TiO2 photocatalysts are shown, including the removal of organic compounds from water/wastewater, air purification, production of hydrogen, lithium storage, inactivation of bacteria, or carbon dioxide reduction.
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Venancio WAL, Rodrigues-Silva C, Spina M, Guimarães JR. Removal of the antimicrobial activity from fortified effluents with fluoroquinolones by photocatalytic processes: a comparative study of differently synthesized TiO 2-N. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:603-614. [PMID: 32960803 DOI: 10.2166/wst.2020.340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This study presents a comparison of three methods for TiO2-N synthesis that were applied in the photocatalytic oxidation of the fluoroquinolones (FQs) ciprofloxacin, ofloxacin, and lomefloxacin in aqueous solution. The TiO2-N bandgap is small enough to allow the use of solar energy in the photocatalytic oxidation (PCO) reactions. The TiO2 doped by a sol-gel method with titanium butoxide (TiO2-N-BUT) and titanium isopropoxide (TiO2-N-PROP) as the precursor were effective as the TiO2 (P25) impregnation with urea (TiO2-N-P25) to degrade the FQs. The FQ degradation was higher by 74, 65, and 91%, respectively for TiO2-N-BUT, TiO2-N-PROP, and TiO2-N (load 50 mg L-1, 20 min of reaction under 28 W UV-ASolar). The TiO2-P25 with urea showed the best performance in FQ degradation. The reaction intermediates might present modifications in their acceptor groups by PCO and, because of that the antimicrobial activity dropped as the reaction time increased. Reactions with TiO2-N-P25 (100 mg L-1) and TiO2-N-BUT (100 mg L-1) achieved ≥ 80% of antimicrobial activity removal from the mixed FQ solution (Cciprofloxacin = 100 μg L-1; Cofloxacin = 100 μg L-1; Clomefloxacin = 100 μg L-1) after 40 min of reaction, for both for Escherichia coli and Bacillus subtilis.
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Affiliation(s)
- Wilson Augusto Lima Venancio
- School of Civil Engineering, Architecture and Urban Design, University of Campinas, P.O. Box 6021, 13083-889, Campinas, SP, Brazil
| | - Caio Rodrigues-Silva
- Institute of Chemistry, Department of Analytical Chemistry, University of Campinas, P.O. Box 6154, 13084-971, Campinas, SP, Brazil E-mail:
| | - Mylena Spina
- School of Civil Engineering, Architecture and Urban Design, University of Campinas, P.O. Box 6021, 13083-889, Campinas, SP, Brazil
| | - José Roberto Guimarães
- School of Civil Engineering, Architecture and Urban Design, University of Campinas, P.O. Box 6021, 13083-889, Campinas, SP, Brazil
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Silva IMP, Byzynski G, Ribeiro C, Longo E. Different dye degradation mechanisms for ZnO and ZnO doped with N (ZnO:N). ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.02.027] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ansari SA, Khan MM, Ansari MO, Cho MH. Nitrogen-doped titanium dioxide (N-doped TiO2) for visible light photocatalysis. NEW J CHEM 2016. [DOI: 10.1039/c5nj03478g] [Citation(s) in RCA: 431] [Impact Index Per Article: 53.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Energy level diagrams for undoped and N-doped TiO2 for visible light induced photocatalytic application.
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Affiliation(s)
- Sajid Ali Ansari
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan-si
- Gyeongbuk 712-749
- South Korea
| | - Mohammad Mansoob Khan
- Chemical Sciences
- Faculty of Science
- Universiti Brunei Darussalam
- JalanTungku Link
- Gadong
| | - Mohd Omaish Ansari
- Centre of Nanotechnology
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Moo Hwan Cho
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan-si
- Gyeongbuk 712-749
- South Korea
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Soares GB, Ribeiro RAP, de Lazaro SR, Ribeiro C. Photoelectrochemical and theoretical investigation of the photocatalytic activity of TiO2 : N. RSC Adv 2016. [DOI: 10.1039/c6ra15825k] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
In N-doping on TiO2 nanomaterial occurs a big decrease of band-gap (1 eV); however, its photocatalysis is low. We clarify such fact from effective mass, i.e., the electron–hole recombination is more than creation of electron–hole pair.
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Affiliation(s)
| | - Renan Augusto Pontes Ribeiro
- Ponta Grossa State University (UEPG)
- Applied Chemistry Postgraduate Program
- Chemistry Department
- Ponta Grossa
- Brazil
| | - Sergio Ricardo de Lazaro
- Ponta Grossa State University (UEPG)
- Applied Chemistry Postgraduate Program
- Chemistry Department
- Ponta Grossa
- Brazil
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