1
|
Filip M, Anghel EM, Rednic V, Papa F, Somacescu S, Munteanu C, Aldea N, Zhang J, Parvulescu V. Variation in Metal-Support Interaction with TiO 2 Loading and Synthesis Conditions for Pt-Ti/SBA-15 Active Catalysts in Methane Combustion. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13101647. [PMID: 37242063 DOI: 10.3390/nano13101647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/03/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023]
Abstract
The control of catalytic performance using synthesis conditions is one of the main goals of catalytic research. Two series of Pt-Ti/SBA-15 catalysts with different TiO2 percentages (n = 1, 5, 10, 30 wt.%) were obtained from tetrabutylorthotitanate (TBOT) and peroxotitanate (PT), as titania precursors and Pt impregnation. The obtained catalysts were characterized using X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), N2 sorption, Raman, X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), hydrogen temperature-programmed reduction (H2-TPR) and H2-chemisorption measurements. Raman spectroscopy showed framework titanium species in low TiO2 loading samples. The anatase phase was evidenced for samples with higher titania loading, obtained from TBOT, and a mixture of rutile and anatase for those synthesized by PT. The rutile phase prevails in rich TiO2 catalysts obtained from PT. Variable concentrations of Pt0 as a result of the stronger interaction of PtO with anatase and the weaker interaction with rutile were depicted using XPS. TiO2 loading and precursors influenced the concentration of Pt species, while the effect on Pt nanoparticles' size and uniform distribution on support was insignificant. The Pt/PtO ratio and their concentration on the surface were the result of strong metal-support interaction, and this influenced catalytic performance in the complete oxidation of methane at a low temperature. The highest conversion was obtained for sample prepared from PT with 30% TiO2.
Collapse
Affiliation(s)
- Mihaela Filip
- Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
| | - Elena Maria Anghel
- Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
| | - Vasile Rednic
- National Institute for R&D of Isotopic and Molecular Technologies, Donat St. 67-103, 400293 Cluj-Napoca, Romania
| | - Florica Papa
- Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
| | - Simona Somacescu
- Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
| | - Cornel Munteanu
- Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
| | - Nicolae Aldea
- National Institute for R&D of Isotopic and Molecular Technologies, Donat St. 67-103, 400293 Cluj-Napoca, Romania
| | - Jing Zhang
- Beijing Synchrotron Radiation Facilities of Beijing Electron Positron Collider National Laboratory,19B Yuquan Road, Beijing 100049, China
| | - Viorica Parvulescu
- Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
| |
Collapse
|
2
|
Wang W, Zhang L, Kang Y, Yang X, Ge S, Yu F. Experimental and density functional study of the light-assisted gas-sensing performance of a TiO 2-CoFe 2O 4 heterojunction. Dalton Trans 2023; 52:4911-4922. [PMID: 36946472 DOI: 10.1039/d2dt04051d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Toluene gas as a solvent is widely present in industrial production and indoor decoration, and can seriously harm human health even at low concentrations. Furthermore, toluene can be used as a typical biomarker for disease diagnosis. Therefore, the detection of toluene gas is very important. Herein, a hydrothermal method was used to successfully prepare a TiO2-CoFe2O4 heterostructure for detecting toluene gas. The ultraviolet (UV)-visible diffuse reflectance spectra and photoluminescence spectra showed that the bandgap of the heterojunction was considerably shorter than those of pure TiO2 and CoFe2O4, and the recombination of electron-hole pairs was inhibited. At the same time, the response value of the TiO2-CoFe2O4 heterojunction was 10.5 for 20 ppm toluene at 219 °C, which was much better than those of pure TiO2 and CoFe2O4. Moreover, its response value further increased under UV irradiation. In addition, density functional theory (DFT) was innovatively employed in this study to explain in detail how the heterojunction and UV irradiation can improve gas sensitivity through the calculation of the material energy band, adsorption energy, etc. This work provides a good reference for the preparation of high-efficiency and high-sensitivity gas sensors.
Collapse
Affiliation(s)
- Wenhao Wang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, P.R. China.
| | - Lu Zhang
- Institute of Materia Medica, Xinjiang University, Urumqi 830017, China.
| | - Yanli Kang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, P.R. China.
| | - Xiaodong Yang
- Key Laboratory of Ecophysics and Department of Physics, College of Science, Shihezi University, Xinjiang 832003, P.R. China.
| | - Shenguang Ge
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan 250022, P.R. China
| | - Feng Yu
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, P.R. China.
| |
Collapse
|
3
|
Azarang M, Bakhtiyari A, Rakhshani R, Davarpanah AM, Aliahmad M, Farifteh Jahantigh M. Green gelatin-assisted: Synthesis of Co3O4NPs@rGO nanopowder for highly efficient magnetically separable methylene orange dye degradation. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2020.12.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
Joseita Dos Santos Costa M, Dos Santos Costa G, Estefany Brandão Lima A, Eduardo da Luz Júnior G, Longo E, Santos Cavalcante L, da Silva Santos R. Photocurrent Response and Progesterone Degradation by Employing WO 3 Films Modified with Platinum and Silver Nanoparticles. Chempluschem 2020; 83:1153-1161. [PMID: 31950714 DOI: 10.1002/cplu.201800534] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Indexed: 11/08/2022]
Abstract
The effect of silver (Ag0 ) and platinum (Pt0 ) metallic nanoparticles (NPs) on WO3 film was investigated by studying the photocurrent response under polychromatic irradiation. The structural phase revealed by X-ray diffraction analysis indicates a monoclinic crystal nanostructure. WO3, Ag0 /WO3, and Pt0 /WO3 electrodes were used to degrade 0.35 mg L-1 progesterone hormone in aqueous solution under polychromatic irradiation for 3h. The studies on degradation were investigated under electrochemically assisted heterogeneous photocatalysis (EHP) conditions. For photodegradation of progesterone, higher performance was achieved when WO3 was functionalized and when the EHP configuration was adopted with bias at +0.7 V vs Ag/AgCl. This study reveals that incorporation of metallic NPs onto a semiconductor increases its efficiency, thereby preventing electron-hole recombination in the photocatalyst and photoelectrochemical limitations of WO3 due to surface plasmon resonance and the trapping state. Therefore, efficient advances in the degradation of organic contaminants during water treatment can be realized.
Collapse
Affiliation(s)
- Maria Joseita Dos Santos Costa
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Gilson Dos Santos Costa
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Aline Estefany Brandão Lima
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Geraldo Eduardo da Luz Júnior
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Elson Longo
- Department of Chemistry of Materials, CDMF-Universidade Estadual Paulista, P.O. Box 355, Araraquara, SP 14801-907, Brazil
| | - Laécio Santos Cavalcante
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Reginaldo da Silva Santos
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| |
Collapse
|
5
|
Ropero-Vega JL, Candal RJ, Pedraza-Avella JA, Niño-Gómez ME, Bilmes SA. Enhanced visible light photoelectrochemical performance of β-Bi2O3-TiO2/ITO thin films prepared by aqueous sol-gel. J Solid State Electrochem 2019. [DOI: 10.1007/s10008-019-04270-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
6
|
Abstract
The energy crisis is one of the most serious issue that we confront today. Among different strategies to gain access to reliable fuel, the production of hydrogen fuel through the water-splitting reaction has emerged as the most viable alternative. Specifically, the studies on defect-rich TiO2 materials have been proved that it can perform as an efficient catalyst for electrocatalytic and photocatalytic water-splitting reactions. In this invited review, we have included a general and critical discussion on the background of titanium sub-oxides structure, defect chemistries and the consequent disorder arising in defect-rich Titania and their applications towards water-splitting reactions. We have particularly emphasized the origin of the catalytic activity in Titania-based material and its effects on the structural, optical and electronic behavior. This review article also summarizes studies on challenging issues on defect-rich Titania and new possible directions for the development of an efficient catalyst with improved catalytic performance.
Collapse
|