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Issa Hamoud H, Wolski L, Pankin I, Bañares MA, Daturi M, El-Roz M. In situ and Operando Spectroscopies in Photocatalysis: Powerful Techniques for a Better Understanding of the Performance and the Reaction Mechanism. Top Curr Chem (Cham) 2022; 380:37. [PMID: 35951125 DOI: 10.1007/s41061-022-00387-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 05/18/2022] [Indexed: 10/15/2022]
Abstract
In photocatalysis, a set of elemental steps are involved together at different timescales to govern the overall efficiency of the process. These steps are divided as follow: (1) photon absorption and excitation (in femtoseconds), (2) charge separation (femto- to picoseconds), (3) charge carrier diffusion/transport (nano- to microseconds), and (4 and 5) reactant activation/conversion and mass transfer (micro- to milliseconds). The identification and quantification of these steps, using the appropriate tool/technique, can provide the guidelines to emphasize the most influential key parameter that improve the overall efficiency and to develop the "photocatalyst by design" concept. In this review, the identification/quantification of reactant activation/conversion and mass transfer (steps 4 and 5) is discussed in details using the in situ/operando techniques, especially the infrared (IR), Raman, and X-ray absorption spectroscopy (XAS). The use of these techniques in photocatalysis was highlighted by the most recent and conclusive case studies which allow a better characterization of the active site and reveal the reaction pathways in order to establish a structure-performance relationship. In each case study, the reaction conditions and the reactor design for photocatalysis (pressure, temperature, concentration, etc.) were thoroughly discussed. In the last part, some examples in the use of time-resolved techniques (time-resolved FTIR, photoluminescence, and transient absorption) are also presented as an author's guideline to study the elemental steps in photocatalysis at shorter timescale (ps, ns, and µs).
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Affiliation(s)
- Houeida Issa Hamoud
- Laboratoire Catalyse et Spectrochimie, Normandie Université, ENSICAEN, UNICAEN, CNRS, 14050, Caen, France
| | - Lukasz Wolski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
| | - Ilia Pankin
- Smart Materials, Research Institute, Southern Federal University, Sladkova Street 174/28, 344090, Rostov-on-Don, Russia
| | - Miguel A Bañares
- Catalytic Spectroscopy Laboratory, Instituto de Catalisis, ICP-CSIC, 28049, Madrid, Spain
| | - Marco Daturi
- Laboratoire Catalyse et Spectrochimie, Normandie Université, ENSICAEN, UNICAEN, CNRS, 14050, Caen, France
| | - Mohamad El-Roz
- Laboratoire Catalyse et Spectrochimie, Normandie Université, ENSICAEN, UNICAEN, CNRS, 14050, Caen, France.
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Controllable high-efficiency transformation of H2O2 to reactive oxygen species via electroactivation of Ti-peroxo complexes. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Li P, Zhang X, Wang J, Xue Y, Yao Y, Chai S, Zhou B, Wang X, Zheng N, Yao J. Engineering O-O Species in Boron Nitrous Nanotubes Increases Olefins for Propane Oxidative Dehydrogenation. J Am Chem Soc 2022; 144:5930-5936. [PMID: 35316601 DOI: 10.1021/jacs.1c13563] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Boron nitride (BN) has been widely studied as an efficient catalyst for oxidative propane dehydrogenation (OPDH). Oxygen-containing boron species (e.g., BO·, B(OH)xO3-x) are generally considered as the active centers in BN for OPDH. Here, we show an effective progressive substitution strategy toward the development of boron-oxygen-nitrogen nanotubes (BONNTs) enriched with O-O species as a highly active, selective, and stable catalyst for OPDH. At 525 °C, an olefin yield of 48.6% is achieved over BONNTs with a propane conversion of 64.4%, 2.8 times that of boron nitrogen nanotubes (BNNTs). Even after reaction for 150 h (475 °C), BONNTs exhibit good olefin yield. Both the B(OH)xO3-x and O-O species that coexist in the BONNT catalyst are demonstrated as active centers, which differs from the B(OH)xO3-x one in BNNTs. Based on catalytic results, propane and oxygen alternate treatment experiments, and theoretical calculations, the O-O center is more favorable for producing both propylene (C3=) and ethylene (C2=), which experiences a dehydration pathway and two possible reaction paths with a lower energy barrier to yield olefins, while B(OH)xO3-x is mainly responsible for producing few C3=.
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Affiliation(s)
- Panpan Li
- Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China
| | - Xuejing Zhang
- School of Chemical Engineering and Technology, Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, P. R. China
| | - Jingnan Wang
- School of Chemical Engineering and Technology, Tianjin University, Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, P. R. China
| | - Yanming Xue
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, P. R. China
| | - Yongbin Yao
- Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China
| | - Shanshan Chai
- Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China
| | - Bo Zhou
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, P. R. China
| | - Xi Wang
- Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, P. R. China
| | - Nanfeng Zheng
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National & Local Joint Engineering Research Center of Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Jiannian Yao
- School of Chemical Engineering and Technology, Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, P. R. China.,Key Laboratory of Photochemistry Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
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Krylov IB, Lopat’eva ER, Subbotina IR, Nikishin GI, Yu B, Terent’ev AO. Mixed hetero-/homogeneous TiO2/N-hydroxyimide photocatalysis in visible-light-induced controllable benzylic oxidation by molecular oxygen. CHINESE JOURNAL OF CATALYSIS 2021. [DOI: 10.1016/s1872-2067(21)63831-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mino L, Negri C, Santalucia R, Cerrato G, Spoto G, Martra G. Morphology, Surface Structure and Water Adsorption Properties of TiO 2 Nanoparticles: A Comparison of Different Commercial Samples. Molecules 2020; 25:molecules25204605. [PMID: 33050364 PMCID: PMC7587218 DOI: 10.3390/molecules25204605] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/01/2020] [Accepted: 10/03/2020] [Indexed: 02/06/2023] Open
Abstract
Water is a molecule always present in the reaction environment in photocatalytic and biomedical applications of TiO2 and a better understanding of its interaction with the surface of TiO2 nanoparticles is crucial to develop materials with improved performance. In this contribution, we first studied the nature and the surface structure of the exposed facets of three commercial TiO2 samples (i.e., TiO2 P25, SX001, and PC105) by electron microscopy and IR spectroscopy of adsorbed CO. The morphological information was then correlated with the water adsorption properties, investigated at the molecular level, moving from multilayers of adsorbed H2O to the monolayer, combining medium- and near-IR spectroscopies. Finally, we assessed in a quantitative way the surface hydration state at different water equilibrium pressures by microgravimetric measurements.
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Affiliation(s)
- Lorenzo Mino
- Department of Chemistry and NIS Centre, University of Torino, via Giuria 7, 10125 Torino, Italy; (C.N.); (R.S.); (G.S.); (G.M.)
- Correspondence: (L.M.); (G.C.)
| | - Chiara Negri
- Department of Chemistry and NIS Centre, University of Torino, via Giuria 7, 10125 Torino, Italy; (C.N.); (R.S.); (G.S.); (G.M.)
- Department of Chemistry, Center for materials science and nanotechnology, University of Oslo, Sem Sælands vei 26, 0371 Oslo, Norway
| | - Rosangela Santalucia
- Department of Chemistry and NIS Centre, University of Torino, via Giuria 7, 10125 Torino, Italy; (C.N.); (R.S.); (G.S.); (G.M.)
| | - Giuseppina Cerrato
- Department of Chemistry and NIS Centre, University of Torino, via Giuria 7, 10125 Torino, Italy; (C.N.); (R.S.); (G.S.); (G.M.)
- Correspondence: (L.M.); (G.C.)
| | - Giuseppe Spoto
- Department of Chemistry and NIS Centre, University of Torino, via Giuria 7, 10125 Torino, Italy; (C.N.); (R.S.); (G.S.); (G.M.)
| | - Gianmario Martra
- Department of Chemistry and NIS Centre, University of Torino, via Giuria 7, 10125 Torino, Italy; (C.N.); (R.S.); (G.S.); (G.M.)
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Martinez-Oviedo A, Ray SK, Joshi B, Lee SW. Enhancement of NOx photo-oxidation by Fe- and Cu-doped blue TiO 2. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:26702-26713. [PMID: 32378104 DOI: 10.1007/s11356-020-09078-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 04/27/2020] [Indexed: 06/11/2023]
Abstract
The present work is focused on the removal of NOx with reduced blue TiO2 with Fe (blue Fe-TiO2)- and Cu (blue Cu-TiO2)-doped photocatalyst. TiO2 was reduced via lithium in EDA (blue TiO2). Fe and Cu ions were doped in the reduced TiO2 (blue Fe-TiO2 and blue Cu-TiO2). The material resulted in a core-shell structure of amorphous and anatase phase. XPS suggests the existence of Ti3+ species and oxygen vacancies within the structure of TiO2. Additionally, valence bond (VB)-XPS shows the generation of intermediate levels at the band edge of the doped photocatalyst. Photocurrent, electrochemical impedance spectroscopy and cyclic voltammetry confirmed the enhanced charge-separation process in doped reduced TiO2. The photocatalysts were tested for the photo-oxidation of NOx. Blue Fe-TiO2 reveals the efficiency of 70% for NO elimination and 44.74% for NO2 formation. The improved efficiency of the doped photocatalyst is related to the re-engineered structure with Ti3+ species, oxygen vacancies, and charge traps. Electron spin resonance (ESR) measurement was carried out for blue Fe-TiO2 to confirm the formation of reactive oxygen species (ROS). Furthermore, ion chromatography was used to investigate the mechanism of NOx oxidation. In conclusion, the doped blue TiO2 has a strong tendency to photo-oxidize NOx gasses.
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Affiliation(s)
- Adriana Martinez-Oviedo
- Department of Environmental and Bio-Chemical Engineering, Sun Moon University, Asan, 3146, Chungnam, Republic of Korea
| | - Schindra Kumar Ray
- Department of Environmental and Bio-Chemical Engineering, Sun Moon University, Asan, 3146, Chungnam, Republic of Korea
| | - Bhupendra Joshi
- Department of Fusion Science and Technology, Sun Moon University, Asan, 31460, Chungnam, Republic of Korea.
| | - Soo Wohn Lee
- Department of Environmental and Bio-Chemical Engineering, Sun Moon University, Asan, 3146, Chungnam, Republic of Korea.
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