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Solís RR, Rodríguez-Padrón D, Martín-Lara MÁ, Calero M, Luque R, Muñoz-Batista MJ. Coffee-waste templated CeO x/TiO 2 nanostructured materials for selective photocatalytic oxidations. CHEMOSPHERE 2023; 311:136672. [PMID: 36228727 DOI: 10.1016/j.chemosphere.2022.136672] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 09/14/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
An environmentally friendly solvent-free approach was tested using spent coffee as a biomass sacrificial template for the preparation of TiO2 modified with CeOx. The use of coffee as a template pursues the preparation of a nanostructured heterojunction without the need for a solvent. Two variables were optimized in the synthesis process, i.e. calcination temperature and proportion of CeOx. Firstly, bare coffee-template titania was prepared to explore the effect of the calcination temperature, within 500-650 °C. The anatase phase was obtained up to 600 °C. Higher temperatures, i.e. 650 °C, led to the appearance of rutile (10%) and efficient removal of the sacrificial agent (0.6% residue). The maximum photocatalytic activity in terms of conversion, in the oxidation of benzyl alcohol, was achieved employing the bare coffee-template TiO2 at 650 °C, and it was found comparable to the benchmarked P25. The incorporation of ceria in the solvent-free approach considerably improved photocatalytic benzaldehyde production. No changes in the XRD pattern of TiO2 were appreciated in the presence of ceria due to the low amount added, within 1.5-6.0%, confirmed by XPS as superficial Ce3+/Ce4+. The UV-visible absorption spectra were considerably redshifted in the presence of Ce, reducing the bandgap values of bare titania. An optimum amount of ceria in the structure within 3-0% was found. In this case, the selectivity towards benzaldehyde was ca. 75%, 3 times higher than the selectivity value registered for the benchmarked P25 or the bare prepared TiO2.
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Affiliation(s)
- Rafael R Solís
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071, Granada, Spain
| | - Daily Rodríguez-Padrón
- Dipartimento di Scienze Molecolari e Nanosistemi, UniversitàCa' Foscari di Venezia, 30123 Venezia, Italy
| | - María Ángeles Martín-Lara
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071, Granada, Spain
| | - Mónica Calero
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071, Granada, Spain
| | - Rafael Luque
- Department of Organic Chemistry, University of Córdoba, Campus de Rabanales, Edificio Marie Curie (C-3), Ctra. Nacional IV-A Km 396, E14014, Córdoba, Spain; Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Str, 117198, Moscow, Russia
| | - Mario J Muñoz-Batista
- Department of Chemical Engineering, Faculty of Sciences, University of Granada, Avda. Fuentenueva, 18071, Granada, Spain.
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Enhanced boron modified graphitic carbon nitride for the selective photocatalytic production of benzaldehyde. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Jedidi W, Arfaoui J, Caudillo-Flores U, Muñoz-Batista MJ, Ksibi Z, Kubacka A, Ghorbel A, Fernández-García M. Photodegradation of 2-propanol in gas phase over zirconium doped TiO2: Effect of Zr content. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sharma S, Kumar N, Mari B, Chauhan NS, Mittal A, Maken S, Kumari K. Solution combustion synthesized TiO2/Bi2O3/CuO nano-composites and their photocatalytic activity using visible LEDs assisted photoreactor. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2020.108418] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Barba-Nieto I, Caudillo-Flores U, Fernández-García M, Kubacka A. Sunlight-Operated TiO 2-Based Photocatalysts. Molecules 2020; 25:E4008. [PMID: 32887383 PMCID: PMC7504741 DOI: 10.3390/molecules25174008] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 08/20/2020] [Accepted: 08/28/2020] [Indexed: 11/16/2022] Open
Abstract
Photo-catalysis is a research field with broad applications in terms of potential technological applications related to energy production and managing, environmental protection, and chemical synthesis fields. A global goal, common to all of these fields, is to generate photo-catalytic materials able to use a renewable energy source such as the sun. As most active photocatalysts such as titanium oxides are essentially UV absorbers, they need to be upgraded in order to achieve the fruitful use of the whole solar spectrum, from UV to infrared wavelengths. A lot of different strategies have been pursued to reach this goal. Here, we selected representative examples of the most successful ones. We mainly highlighted doping and composite systems as those with higher potential in this quest. For each of these two approaches, we highlight the different possibilities explored in the literature. For doping of the main photocatalysts, we consider the use of metal and non-metals oriented to modify the band gap energy as well as to create specific localized electronic states. We also described selected cases of using up-conversion doping cations. For composite systems, we described the use of binary and ternary systems. In addition to a main photo-catalyst, these systems contain low band gap, up-conversion or plasmonic semiconductors, plasmonic and non-plasmonic metals and polymers.
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Affiliation(s)
- Irene Barba-Nieto
- Instituto de Catálisis y Petroleoquímica (CSIC), C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain; (I.B.-N.); (U.C.-F.)
| | - Uriel Caudillo-Flores
- Instituto de Catálisis y Petroleoquímica (CSIC), C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain; (I.B.-N.); (U.C.-F.)
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada 22800, Mexico
| | - Marcos Fernández-García
- Instituto de Catálisis y Petroleoquímica (CSIC), C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain; (I.B.-N.); (U.C.-F.)
| | - Anna Kubacka
- Instituto de Catálisis y Petroleoquímica (CSIC), C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain; (I.B.-N.); (U.C.-F.)
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Singh R, Kumar M, Khajuria H, Tashi L, Sheikh HN. Nitrogen‐doped graphene‐cerium oxide (NG‐CeO
2
) photocatalyst for the photodegradation of methylene blue in waste water. J CHIN CHEM SOC-TAIP 2018. [DOI: 10.1002/jccs.201800317] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Manesh Kumar
- Department of ChemistryUniversity of Jammu Jammu India
| | | | - Lobzang Tashi
- Department of ChemistryUniversity of Jammu Jammu India
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Temperature-Program Assisted Synthesis of Novel Z-Scheme CuBi₂O₄/ β-Bi₂O₃ Composite with Enhanced Visible Light Photocatalytic Performance. NANOMATERIALS 2018; 8:nano8080579. [PMID: 30060581 PMCID: PMC6116239 DOI: 10.3390/nano8080579] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/22/2018] [Accepted: 07/26/2018] [Indexed: 11/16/2022]
Abstract
Novel Z-Scheme CuBi2O4/β-Bi2O3 composite photocatalysts with different mass ratios and calcination temperatures were firstly synthesized by the hydrothermal method following a temperature-programmed process. The morphology, crystal structure, and light absorption properties of the as-prepared samples were systematically characterized, and the composites exhibited enhanced photocatalytic activity toward diclofenac sodium (DS) degradation compared with CuBi2O4 and β-Bi2O3 under visible light irradiation. The optimal photocatalytic efficiency of the composite, achieved at the mass ratio of CuBi2O4 and β-Bi2O3 of 1:2.25 and the calcination temperature of 600 °C is 92.17%. After the seventh recycling of the composite, the degradation of DS can still reach 82.95%. The enhanced photocatalytic activity of CuBi2O4/β-Bi2O3 is closely related to OH•, h+ and O2•−, and the photocatalytic mechanism of CuBi2O4/β-Bi2O3 can be explained by the Z-Scheme theory.
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