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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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Jafarzadeh H, Karaman C, Güngör A, Karaman O, Show PL, Sami P, Mehrizi AA. Hydrogen production via sodium borohydride hydrolysis catalyzed by cobalt ferrite anchored nitrogen-and sulfur co-doped graphene hybrid nanocatalyst: Artificial neural network modeling approach. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.05.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Mazhari V, Hosseini H, Schaffie M, Ranjbar M. Impact of nanoparticles on the surface characteristics of reservoir minerals in relation to the in-situ combustion process of enhanced oil recovery. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-02252-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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