1
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Marzouk A, Papavasileiou KD, Peristeras LD, Bezemer L, van Bavel AP, Shenai PM, Economou IG. A systematic DFT study of structure and electronic properties of titanium dioxide. J Comput Chem 2024. [PMID: 38785277 DOI: 10.1002/jcc.27376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 04/02/2024] [Accepted: 04/08/2024] [Indexed: 05/25/2024]
Abstract
DFT functionals are of paramount importance for an accurate electronic and structural description of transition metal systems. In this work, a systematic analysis using some well-known and commonly used DFT functionals is performed. A comparison of the structural and energetic parameters calculated with the available experimental data is made in order to find the adequate functional for an accurate description of the TiO2 bulk and surface of both anatase and rutile structures. In the absence of experimental data on the surface energy, the theoretical predictions obtained using the high-accuracy HSE06 functional were used as a reference to compare against the surface energy values calculated with the other DFT functionals. A clear improvement in the electronic description of both anatase and rutile was observed by introducing the Hubbard U correction term to PBE, PW91, and OptPBE functionals. The OptPBE-U4 functional was found to offer a good compromise between accurately describing the structural and electronic properties of titania.
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Affiliation(s)
- Asma Marzouk
- Chemical Engineering Program, Texas A&M University at Qatar, Doha, Qatar
| | - Konstantinos D Papavasileiou
- Molecular Thermodynamics and Modelling of Materials Laboratory, National Center for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, Athens, Greece
| | - Loukas D Peristeras
- Molecular Thermodynamics and Modelling of Materials Laboratory, National Center for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, Athens, Greece
| | - Leendert Bezemer
- GTL and XTL Research, Shell Global Solutions International BV, Amsterdam, The Netherlands
| | - Alexander P van Bavel
- Next Generation Breakthrough Research, Shell Global Solutions International BV, Amsterdam, The Netherlands
| | - Prathamesh M Shenai
- Computational Chemistry and Material Science, Shell India Markets Pvt. Ltd, Shell India Markets Pvt. Ltd, Banglore, India
| | - Ioannis G Economou
- Chemical Engineering Program, Texas A&M University at Qatar, Doha, Qatar
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2
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Adamowicz W, Yaemsunthorn K, Kobielusz M, Macyk W. Photocatalytic Transformation of Organics to Valuable Chemicals - Quo Vadis? Chempluschem 2024:e202400171. [PMID: 38679579 DOI: 10.1002/cplu.202400171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 05/01/2024]
Abstract
Recent development in photocatalysis is increasingly focused on transforming organic compounds toward producing fine chemicals. Simple, non-selective oxidation reactions (degradation of pollutants) and very demanding solar-to-chemical energy conversion processes (production of solar fuels) face severe economic limitations influenced by still low efficiency and insufficient stability of the systems. Synthesis of fine chemicals, including reductive and oxidative selective transformations, as well as C-C and C-N coupling reactions, can utilise the power of photocatalysis. Herein, we present the recent progress in photocatalytic systems designed to synthesise fine chemicals. In particular, we discuss the factors influencing the efficiency and selectivity of the organic transformations, dividing them into intrinsic (related to individual properties of photocatalysts) and extrinsic (originating from the reaction environment). A rational design of the photocatalytic systems, based on a deep understanding of these factors, opens new perspectives for applied photocatalysis.
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Affiliation(s)
- Wiktoria Adamowicz
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
- Doctoral School of Exact and Natural Sciences, Jagiellonian University, ul. Łojasiewicza 11, 30-348, Kraków, Poland
| | - Kasidid Yaemsunthorn
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155, Kraków, Poland
| | - Marcin Kobielusz
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
| | - Wojciech Macyk
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387, Kraków, Poland
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3
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Yang J, Luo H, Zhu X, Cai L, Zhou L, Ruan H, Chen J. Copper-doped bismuth oxychloride nanosheets assembled into sphere-like morphology for improved photocatalytic inactivation of drug-resistant bacteria. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168916. [PMID: 38036130 DOI: 10.1016/j.scitotenv.2023.168916] [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: 10/11/2023] [Revised: 11/22/2023] [Accepted: 11/25/2023] [Indexed: 12/02/2023]
Abstract
The devastating microbiological contamination as well as emerging drug-resistant bacteria has posed severe threats to the ecosystem and public health, which propels the continuous exploitation of safe yet efficient disinfection products and technology. Here, copper doping engineered bismuth oxychloride (Cu-BiOCl) nanocomposite with a hierarchical spherical structure was successfully prepared. It was found that due to the exposure of abundant active sites for the adsorption of both bacteria cells and molecular oxygen in the structure, the obtained Cu-BiOCl with nanosheets assembled into sphere-like morphology exhibited remarkable photocatalytic antibacterial effects. In particular, compared to the pure BiOCl, composite Cu-BiOCl possessed improved antibacterial effects against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and Methicillin-resistant Staphylococcus aureus (MRSA). The combination of physicochemical characterizations and theoretical calculations has revealed that copper doping significantly promoted the light absorbance, inhibited the recombination of electron-hole pairs, and enhanced molecular oxygen adsorption, which resulted in more generation of active species including reactive oxygen species (ROS) and h+ to achieve superior photocatalytic bacterial inactivation. Finally, transcriptome analysis on MRSA pinpointed photocatalytic inactivation induced by Cu-BiOCl may retard largely the development of drug-resistance. Therefore, the built spherical Cu-BiOCl nanocomposite has provided an ecofriendly, economical and robust strategy for the efficient removal of drug-resistant bacteria with promising potentials for environmental and healthcare utilizations.
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Affiliation(s)
- Jing Yang
- The Key Laboratory of Modern Toxicology, Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; The Affiliated Chongqing Prevention and Treatment Center for Occupational Diseases, School of Public Health, Nanjing Medical University, Chongqing 400060, China
| | - Huan Luo
- The Key Laboratory of Modern Toxicology, Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; The Affiliated Chongqing Prevention and Treatment Center for Occupational Diseases, School of Public Health, Nanjing Medical University, Chongqing 400060, China
| | - Xinyi Zhu
- The Key Laboratory of Modern Toxicology, Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Ling Cai
- The Key Laboratory of Modern Toxicology, Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; The Affiliated Chongqing Prevention and Treatment Center for Occupational Diseases, School of Public Health, Nanjing Medical University, Chongqing 400060, China; School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Liuzhu Zhou
- The Key Laboratory of Modern Toxicology, Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Hongjie Ruan
- Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, 123 Tianfei Lane, Nanjing 210004, China.
| | - Jin Chen
- The Key Laboratory of Modern Toxicology, Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; The Affiliated Chongqing Prevention and Treatment Center for Occupational Diseases, School of Public Health, Nanjing Medical University, Chongqing 400060, China; School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China; Jiangsu Province Engineering Research Center of Antibody Drug, Key Laboratory of Antibody Technique of National Health Commission, Nanjing Medical University, Nanjing 211166, China.
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4
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Wang M, Fan S, Li X, Shi J, Mao Y, Yang Y, Li G. Construction of Monoatomic-Modified Defective Ti 4+αTi 3+1-αO 2-δ Nanofibers for Photocatalytic Oxidation of HMF to Valuable Chemicals. ACS APPLIED MATERIALS & INTERFACES 2024; 16:5735-5744. [PMID: 38271590 DOI: 10.1021/acsami.3c14110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Abstract
Efficiently upgrading 5-hydroxymethylfurfural (HMF) into high-value-added products, such as 2,5-diformylfuran (DFF) and 2,5-furan dicarboxylic acid (FDCA), through a photocatalytic process by using solar energy has been incessantly pursued worldwide. Herein, a series of transition-metal (TM = Ni, Fe, Co, Cu) single atoms were supported on Ti4+αTi3+1-αO2-δ nanofibers (NFs) with certain defects (Ov), denoted as TM SAC-Ti4+αTi3+1-αO2-δ NFs (TM = Ni, Fe, Co, Cu), aiming to enhance the photocatalytic conversion of HMF. A super HMF conversion rate of 57% and a total yield of 1718.66 μmol g-1 h-1 (DFF and FDCA) surpassing that of the Ti4+αTi3+1-αO2-δ NFs by 1.6 and 2.1 times, respectively, are realized when TM is Co (Co SAC-Ti4+αTi3+1-αO2-δ NFs). Experiments combined with density functional theory calculation (DFT) demonstrate that the TM single atoms occupy the Ti site of Ti4+αTi3+1-αO2-δ NFs, which plays a dominant role in the photo-oxidation of HMF. Raman, X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) characterizations confirm the strong electron local exchange interaction in TM SAC-Ti4+αTi3+1-αO2-δ NFs and demonstrate the substitution of Ti by the TM SACs. The projected density of states and charge density difference reveal that the strong interaction between metal-3d and O-2p orbitals forms Ti-O-TM bonds. The bonds are identified as the adsorption site, where TM single atoms on the surface of Ti4+αTi3+1-αO2-δ NFs reduce HMF molecule adsorption energy (Eads). Furthermore, the TM single atom modulates the electronic structure of TM SAC-Ti4+αTi3+1-αO2-δ NFs through electron transfer, leading to narrow band gaps of the photocatalysts and enhancing their photocatalytic performance. This study has uncovered a newer strategy for enhancing the photocatalytic attributes of semiconducting materials.
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Affiliation(s)
- Mufan Wang
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Shiying Fan
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xinyong Li
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Jugong Shi
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yan Mao
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yaqi Yang
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China
| | - Gao Li
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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5
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Tian N, Comer BM, Medford AJ. Screening and Discovery of Metal Compound Active Sites for Strong and Selective Adsorption of N 2 in Air. CHEMSUSCHEM 2023; 16:e202300948. [PMID: 37890028 DOI: 10.1002/cssc.202300948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 10/29/2023]
Abstract
Photocatalytic nitrogen fixation has the potential to provide a greener route for producing nitrogen-based fertilizers under ambient conditions. Computational screening is a promising route to discover new materials for the nitrogen fixation process, but requires identifying "descriptors" that can be efficiently computed. In this work, we argue that selectivity toward the adsorption of molecular nitrogen and oxygen can act as a key descriptor. A catalyst that can selectively adsorb nitrogen and resist poisoning of oxygen and other molecules present in air has the potential to facilitate the nitrogen fixation process under ambient conditions. We provide a framework for active site screening based on multifidelity density functional theory (DFT) calculations for a range of metal oxides, oxyborides, and oxyphosphides. The screening methodology consists of initial low-fidelity fixed geometry calculations and a second screening in which more expensive geometry optimizations were performed. The approach identifies promising active sites on several TiO2 polymorph surfaces and a VBO4 surface, and the full nitrogen reduction pathway is studied with the BEEF-vdW and HSE06 functionals on two active sites. The findings suggest that metastable TiO2 polymorphs may play a role in photocatalytic nitrogen fixation, and that VBO4 may be an interesting material for further studies.
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Affiliation(s)
- Nianhan Tian
- Georgia Institute of Technology, 311 Ferst Dr NW, Atlanta, GA, 30332, United States
| | - Benjamin M Comer
- SUNCAT Center for Interface Science and Catalysis 443 Via Ortega, Stanford, CA 94305 United States, SLAC National Accelerator Laboratory 2575 Sand Hill Road, Mail Stop 31, Menlo Park, California, 94025, United States
- Now at Shell Global Solutions (United States) Inc, Houston, TX, United States
| | - Andrew J Medford
- Georgia Institute of Technology, 311 Ferst Dr NW, Atlanta, GA, 30332, United States
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6
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Chen Y, Soler L, Cazorla C, Oliveras J, Bastús NG, Puntes VF, Llorca J. Facet-engineered TiO 2 drives photocatalytic activity and stability of supported noble metal clusters during H 2 evolution. Nat Commun 2023; 14:6165. [PMID: 37789037 PMCID: PMC10547715 DOI: 10.1038/s41467-023-41976-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 09/25/2023] [Indexed: 10/05/2023] Open
Abstract
Metal clusters supported on TiO2 are widely used in many photocatalytic applications, including pollution control and production of solar fuels. Besides high photoactivity, stability during the photoreaction is another essential quality of high-performance photocatalysts, however systematic studies on this attribute are absent for metal clusters supported on TiO2. Here we have studied, both experimentally and with first-principles simulation methods, the stability of Pt, Pd and Au clusters prepared by ball milling on nanoshaped anatase nanoparticles preferentially exposing {001} (plates) and {101} (bipyramids) facets during the photogeneration of hydrogen. It is found that Pt/TiO2 exhibits superior stability than Pd/TiO2 and Au/TiO2, and that {001} facet-based photocatalysts always are more stable than their {101} analogous regardless of the considered metal species. The loss of stability associated with cluster sintering, which is facilitated by the transfer of photoexcited carriers from the metal species to the neighbouring Ti and O atoms, most significantly and detrimentally affects the H2-evolution photoactivity.
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Affiliation(s)
- Yufen Chen
- Department of Chemical Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 16, EEBE, Barcelona, 08019, Spain
- Institute of Energy Technologies and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 16, EEBE, Barcelona, 08019, Spain
| | - Lluís Soler
- Department of Chemical Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 16, EEBE, Barcelona, 08019, Spain.
- Institute of Energy Technologies and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 16, EEBE, Barcelona, 08019, Spain.
| | - Claudio Cazorla
- Department of Physics, Universitat Politècnica de Catalunya, Campus Nord, B4-B5, Barcelona, E-08034, Spain
| | - Jana Oliveras
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Barcelona, Spain
| | - Neus G Bastús
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Barcelona, Spain
| | - Víctor F Puntes
- Institut Català de Nanociència i Nanotecnologia (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Barcelona, Spain
- Institució Catalana de Recerca I Estudis Avançats (ICREA), 08010, Barcelona, Spain
- Vall d'Hebron Research Institute (VHIR), Hospital Universitari Vall d'Hebron, Passeig de la Vall d'Hebron, 129, Barcelona, 08035, Spain
| | - Jordi Llorca
- Department of Chemical Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 16, EEBE, Barcelona, 08019, Spain.
- Institute of Energy Technologies and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Eduard Maristany 16, EEBE, Barcelona, 08019, Spain.
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7
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Zeng Z, Wodaczek F, Liu K, Stein F, Hutter J, Chen J, Cheng B. Mechanistic insight on water dissociation on pristine low-index TiO 2 surfaces from machine learning molecular dynamics simulations. Nat Commun 2023; 14:6131. [PMID: 37783698 PMCID: PMC10545769 DOI: 10.1038/s41467-023-41865-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Accepted: 09/18/2023] [Indexed: 10/04/2023] Open
Abstract
Water adsorption and dissociation processes on pristine low-index TiO2 interfaces are important but poorly understood outside the well-studied anatase (101) and rutile (110). To understand these, we construct three sets of machine learning potentials that are simultaneously applicable to various TiO2 surfaces, based on three density-functional-theory approximations. Here we show the water dissociation free energies on seven pristine TiO2 surfaces, and predict that anatase (100), anatase (110), rutile (001), and rutile (011) favor water dissociation, anatase (101) and rutile (100) have mostly molecular adsorption, while the simulations of rutile (110) sensitively depend on the slab thickness and molecular adsorption is preferred with thick slabs. Moreover, using an automated algorithm, we reveal that these surfaces follow different types of atomistic mechanisms for proton transfer and water dissociation: one-step, two-step, or both. These mechanisms can be rationalized based on the arrangements of water molecules on the different surfaces. Our finding thus demonstrates that the different pristine TiO2 surfaces react with water in distinct ways, and cannot be represented using just the low-energy anatase (101) and rutile (110) surfaces.
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Affiliation(s)
- Zezhu Zeng
- The Institute of Science and Technology Austria, Am Campus 1, 3400, Klosterneuburg, Austria
| | - Felix Wodaczek
- The Institute of Science and Technology Austria, Am Campus 1, 3400, Klosterneuburg, Austria
| | - Keyang Liu
- School of Physics, Peking University, Beijing, 100871, P. R. China
| | - Frederick Stein
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
- Center for Advanced Systems Understanding (CASUS), Helmholtz-Zentrum Dresden, Rossendorf (HZDR), Untermarkt 20, 02826, Görlitz, Germany
| | - Jürg Hutter
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Ji Chen
- School of Physics, Peking University, Beijing, 100871, P. R. China
- Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing, China
- Frontiers Science Center for Nano-Optoelectronics, Peking University, Beijing, China
| | - Bingqing Cheng
- The Institute of Science and Technology Austria, Am Campus 1, 3400, Klosterneuburg, Austria.
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8
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Xing C, Yang L, He R, Spadaro MC, Zhang Y, Arbiol J, Li J, Poudel B, Nozariasbmarz A, Li W, Lim KH, Liu Y, Llorca J, Cabot A. Brookite TiO 2 Nanorods as Promising Electrochromic and Energy Storage Materials for Smart Windows. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2303639. [PMID: 37608461 DOI: 10.1002/smll.202303639] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 07/15/2023] [Indexed: 08/24/2023]
Abstract
Electrochromic smart windows (ESWs) offer an attractive option for regulating indoor lighting conditions. Electrochromic materials based on ion insertion/desertion mechanisms also present the possibility for energy storage, thereby increasing overall energy efficiency and adding value to the system. However, current electrochromic electrodes suffer from performance degradation, long response time, and low coloration efficiency. This work aims to produce defect-engineered brookite titanium dioxide (TiO2 ) nanorods (NRs) with different lengths and investigate their electrochromic performance as potential energy storage materials. The controllable synthesis of TiO2 NRs with inherent defects, along with smaller impedance and higher carrier concentrations, significantly enhances their electrochromic performance, including improved resistance to degradation, shorter response times, and enhanced coloration efficiency. The electrochromic performance of TiO2 NRs, particularly longer ones, is characterized by fast switching speeds (20 s for coloration and 12 s for bleaching), high coloration efficiency (84.96 cm2 C-1 at a 600 nm wavelength), and good stability, highlighting their potential for advanced electrochromic smart window applications based on Li+ ion intercalation.
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Affiliation(s)
- Congcong Xing
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
- Catalonia Institute for Energy Research (IREC), Sant Adrià de Besòs, Barcelona, 08930, Spain
- Institute of Energy Technologies, Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Barcelona, 08019, Spain
| | - Linlin Yang
- Catalonia Institute for Energy Research (IREC), Sant Adrià de Besòs, Barcelona, 08930, Spain
- Departament d'Enginyeria Electronica i Biomedica, Universitat de Barcelona, Barcelona, 08028, Spain
| | - Ren He
- Catalonia Institute for Energy Research (IREC), Sant Adrià de Besòs, Barcelona, 08930, Spain
- Departament d'Enginyeria Electronica i Biomedica, Universitat de Barcelona, Barcelona, 08028, Spain
| | - Maria Chiara Spadaro
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona, 08193, Spain
| | - Yu Zhang
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
- Catalonia Institute for Energy Research (IREC), Sant Adrià de Besòs, Barcelona, 08930, Spain
| | - Jordi Arbiol
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona, 08193, Spain
- ICREA, Pg. Lluis Companys 23, Barcelona, 08010, Spain
| | - Junshan Li
- Institute for Advanced Study, Chengdu University, Chengdu, Sichuan, 610106, China
| | - Bed Poudel
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Amin Nozariasbmarz
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Wenjie Li
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Khak Ho Lim
- Institute of Zhejiang University-Quzhou, Quzhou, Zhejiang, 324000, China
| | - Yu Liu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Jordi Llorca
- Institute of Energy Technologies, Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, EEBE, Barcelona, 08019, Spain
| | - Andreu Cabot
- Catalonia Institute for Energy Research (IREC), Sant Adrià de Besòs, Barcelona, 08930, Spain
- ICREA, Pg. Lluis Companys 23, Barcelona, 08010, Spain
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9
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He P, Zhang L, Xiao S, Jiang W, Wu Y, Yan C, Li X, Chen Z, Wu L, Duan T. Dual Charge-Transfer Channels Harmonize Carrier Separation for Efficient U(VI) Photoreduction. Inorg Chem 2023; 62:4705-4715. [PMID: 36880867 DOI: 10.1021/acs.inorgchem.3c00221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
The low efficient transfer of photogenerated electrons to an active catalytic site is a pivotal problem for the photoreduction of highly soluble hexavalent uranium [U(VI)] to low soluble tetravalent uranium [U(IV)]. Herein, we successfully synthesized a TiO2-x/1T-MoS2/reduced graphene oxide heterojunction (T2-xTMR) with dual charge-transfer channels by exploiting the difference in Fermi levels between the heterojunction interfaces, which induced multilevel separation of photogenerated carriers. Theoretical and experimental results demonstrate that the presence of the electron buffer layer promoted the efficient migration of photogenerated electrons between the dual charge-transfer channels, which achieved effective separation of photogenerated carriers in physical/spatial dimensions and significantly extended the lifetime of photogenerated electrons. The migration of photogenerated electrons to the active catalytic site after multilevel spatial separation enabled the T2-xTMR dual co-photocatalyst to remove 97.4% of the high concentration of U(VI) from the liquid-phase system within 80 min. This work provides a practical reference for utilizing multiple co-catalysts to accomplish directed spatial separation of photogenerated carriers.
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Affiliation(s)
- Pan He
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Ling Zhang
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Shunhong Xiao
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Wenyi Jiang
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Yiquan Wu
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Chenhui Yan
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
| | - Xiaoan Li
- NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, Mianyang, Sichuan 621099, China
| | - Zhengguo Chen
- NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, Mianyang, Sichuan 621099, China
| | - Linzhen Wu
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China.,Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
| | - Tao Duan
- State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
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10
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Khalifa ZS, Shaban M, Ahmed IA. Photocatalytic Degradation of Methyl Orange and Methylene Blue Dyes by Engineering the Surface Nano-Textures of TiO 2 Thin Films Deposited at Different Temperatures via MOCVD. Molecules 2023; 28:molecules28031160. [PMID: 36770827 PMCID: PMC9922017 DOI: 10.3390/molecules28031160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/13/2023] [Accepted: 01/17/2023] [Indexed: 01/26/2023] Open
Abstract
TiO2 thin films were deposited on quartz substrates by metal-organic chemical vapor deposition (MOCVD) at temperatures of 250, 350, and 450 °C. X-ray diffraction (XRD) data revealed the production of a pure anatase phase, a decrease in crystallite size, and a textural change as deposition temperature increased. Atomic force microscopy (AFM) was used to study the morphological properties and confirm XRD results. UV-Vis.-NIR spectroscopy was used to investigate the optical properties of the samples. The effect of deposition temperature on wettability was investigated using contact angle measurements. Sunlight photocatalytic properties increased with the increase in deposition temperature for methyl orange and methylene blue. Films were post-annealed at 500 °C for 2 h. The effect of annealing on all the above-mentioned properties was explored. The kinetic analysis demonstrated superb agreement with the kinetic pseudo-first-order model. The rate of photocatalytic degradation of MB was ~8, 13, and 12 times that of MO using 250, 350, and 450 °C deposited films, respectively. Photodegradation was found to depend on the specific surface area, type of pollutant, and annealing temperature.
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Affiliation(s)
- Zaki S. Khalifa
- Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62511, Egypt
- Correspondence: (Z.S.K.); (I.A.A.)
| | - Mohamed Shaban
- Department of Physics, Faculty of Science, Islamic University of Madinah, Madinah 42351, Saudi Arabia
- Nanophotonics and Applications (NPA) Lab, Physics Department, Faculty of Science, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Inas A. Ahmed
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 62224, Saudi Arabia
- Correspondence: (Z.S.K.); (I.A.A.)
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11
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Zhao Y, Liu X, Ma B, Li Y, Fan X, Zhang F, Zhang G, Peng W. Facet Dependent Activity of Fe(III) Species Modified TiO 2 for Simulated Sunlight Driven Fenton-like Reactions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:52940-52950. [PMID: 36383831 DOI: 10.1021/acsami.2c16144] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
TiO2 crystals with different exposed facets are synthesized and modified facilely by depositing Fe(III) species. With more (101) facets exposed, the photoactivity of Fe-TiO2 is obviously enhanced with peroxymonosulfate (PMS) as oxidant. The degradation rate for 20 ppm Bisphenol A (BPA) on Fe-TiO2 (101) can achieve 0.219 min-1, ∼8.5 times faster than that of pure TiO2 under simulated sunlight irradiation. Photoelectrochemical measurements and density functional theory (DFT) calculations confirm that the interfacial charge transfer (IFCT) on Fe-TiO2 (101) is stronger than that on Fe-TiO2 (001) and a faster Fe(III)/Fe(II) transformation rate can be therefore achieved. As a result, the generation of ·OH and 1O2 will be accelerated with more (101) facets exposed, thus obtaining better photoactivity. Under the Fe-TiO2/PMS/Light system, BPA can be effectively degraded in a wide pH range or in the presence of multiple inorganic anions. After five cycles, 100% BPA can still be degraded within 60 min. The study provides new photocatalysts design strategy based on Fe(III)/Fe(II) redox for PMS based photocatalytic oxidation.
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Affiliation(s)
- Yang Zhao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Xiaomei Liu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Biao Ma
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Yang Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Xiaobin Fan
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Fengbao Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Guoliang Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
| | - Wenchao Peng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300050, China
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12
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Liu X, Zhang X, Chen W. Pd Nanoparticles Supported on N-Doped TiO 2 Nanosheets: Crystal Facets, Defective Sites, and Metal-Support Interactions Boost Reforming of Formaldehyde Solution for Hydrogen Production. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13532-13542. [PMID: 36300888 DOI: 10.1021/acs.langmuir.2c02111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
To produce H2 from formaldehyde (HCHO), dehydrogenation offers an alternative approach to future hydrogen-based energy sources, but the unsatisfactory efficiency hinders its practical application. Here, ultrafine Pd nanoparticle (NP) decorated N-doped TiO2 nanosheets exposed with (001) facet catalysts (denoted as Pd/TiO2-x) have been prepared and exhibit superior H2 production performance from alkaline HCHO aqueous solution. Under our current conditions, the Pd/TiO2-x catalyst with a Pd loading of 1 wt % exhibits a H2 production rate of 183.77 mL/min/g, which is 1.75 and 3.66 times that of Pd/TiO2 and Pd NPs, respectively. Based on the results of Fourier transform infrared spectroscopy (FTIR), Raman, and liquid-phase electron paramagnetic resonance (EPR) spin-trapping experiments, the excellent H2 generation of Pd/TiO2-x can be attributed to the synergistic contribution among the reactive crystal facets, defective sites, and metal-support interactions in boosting the breakage of C-H bonds in HCHO, dissociation of H2O, and ultimately the formation of H2. This work is expected to provide a paradigm of an efficient catalyst to produce H2 from HCHO/H2O solution.
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Affiliation(s)
- Xiaogang Liu
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan464000, China
- Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, Henan464000, China
- Xinyang Key Laboratory of Low-Carbon Energy Materials, Xinyang Normal University, Xinyang464000, China
| | - Xin Zhang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan464000, China
| | - Wenjie Chen
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan464000, China
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13
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Yu J, Mamakhel A, Søndergaard-Pedersen F, Ceccato M, Iversen BB. Scrutinizing particle size related bond strengthening in anatase TiO 2. Dalton Trans 2022; 51:13515-13526. [PMID: 35997150 DOI: 10.1039/d2dt02128e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of small, middle, and large anatase TiO2 particles were synthesized through the hydrolysis of titanium tetraisopropoxide (TTIP) to investigate the size-related chemical bond length and strength variation. Unit cell volume contraction with decreasing particle size is identified from Rietveld refinement of high-resolution synchrotron powder X-ray diffraction (PXRD) patterns. More titanium vacancies are also found for smaller anatase particles. Contrary to the variation in unit cell volume, a larger Debye temperature ΘD(TiO2) derived from the linear and nonlinear fitting of atomic displacement parameters (Uiso(TiO2)) as a function of temperature is revealed for smaller anatase particles. The length of the Ti-O bond is also shorter for smaller anatase particles. Furthermore, optical phonon frequencies blue-shifting with the decrease in anatase particle size are determined by Raman spectroscopy. X-ray photoelectron spectroscopy (XPS) analysis rules out the presence of a large amount of Ti3+, while optical diffuse reflectance measurement eliminates the existence of a large number of oxygen vacancies in all particles. Combining the analysis results of PXRD, thermogravimetric analysis (TGA), and Fourier-transform infrared spectroscopy (FTIR), more structural and surface hydroxyls (-OH) appear to exist in smaller anatase particles. It is the structural and surface -OH that are responsible for the size-related chemical bond length and strength variation in the as-synthesized anatase particles.
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Affiliation(s)
- Jinlong Yu
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark.
| | - Aref Mamakhel
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark.
| | - Frederik Søndergaard-Pedersen
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark.
| | - Marcel Ceccato
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus, Denmark
| | - Bo Brummerstedt Iversen
- Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark.
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14
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Design and Preparation of Polyimide/TiO2@MoS2 Nanofibers by Hydrothermal Synthesis and Their Photocatalytic Performance. Polymers (Basel) 2022; 14:polym14163230. [PMID: 36015487 PMCID: PMC9412554 DOI: 10.3390/polym14163230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 06/30/2022] [Accepted: 07/05/2022] [Indexed: 11/24/2022] Open
Abstract
Organic–inorganic nanocomposite fibers can avoid the agglomeration of single nanoparticles and reduce the cost (nanoparticles assembled on the surface of nanofibers), but also can produce new chemical, electrical, optical, and other properties, with a composite synergistic effect. Aromatic polyimide (PI) is a high-performance polymer with a rigid heterocyclic imide ring and an aromatic benzene ring in its macromolecular framework. Due to its excellent mechanical properties, thermal stability, and easy-to-adjust molecular structure, PI has been widely used in electronics, aerospace, automotive, and other industries related to many applications. Here, we report that TiO2 nanorods were grown on polyimide nanofibers by hydrothermal reaction, and MoS2 nanosheets were grown on TiO2 nanorods the same way. Based on theoretical analysis and experimental findings, the possible growth mechanism was determined in detail. Further experiments showed that MoS2 nanosheets were uniformly coated on the surface of TiO2 nanorods. The TiO2 nanorods have photocatalytic activity in the ultraviolet region, but the bandgap of organic/inorganic layered nanocomposites can redshift to visible light and improve their photocatalytic performance.
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15
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Sendão RMS, Esteves da Silva JCG, Pinto da Silva L. Photocatalytic removal of pharmaceutical water pollutants by TiO 2 - Carbon dots nanocomposites: A review. CHEMOSPHERE 2022; 301:134731. [PMID: 35489458 DOI: 10.1016/j.chemosphere.2022.134731] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 04/06/2022] [Accepted: 04/22/2022] [Indexed: 06/14/2023]
Abstract
Pharmaceuticals are becoming increasingly more relevant water contaminants, with photocatalysts (such as TiO2) being a promising approach to remove these compounds from water. However, TiO2 has poor sunlight-harvesting capacity, low photonic efficiency, and poor adsorption towards organic pollutants. One of the emerging strategies to enhance the photocatalytic performance of TiO2 is by conjugating it with fluorescent carbon dots. Herein, we performed a critical review of the development of TiO2 - carbon dots nanocomposites for the photocatalytic removal of pharmaceuticals. We found that carbon dots can improve the photocatalytic efficiency of the resulting nanocomposites, mostly due to increasing the adsorption of organic pollutants and enhancing the absorption in the visible range. However, while this approach shows significant promise, we also identified and discussed several aspects that need to be addressed before this strategy could be more widely used. We hope that this review can guide future studies aiming to the development of enhanced photocatalytic TiO2 - carbon dots nanocomposites.
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Affiliation(s)
- Ricardo M S Sendão
- Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Faculty of Sciences of University of Porto (FCUP), Rua do Campo Alegre 687, 4169-007, Porto, Portugal
| | - Joaquim C G Esteves da Silva
- Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Faculty of Sciences of University of Porto (FCUP), Rua do Campo Alegre 687, 4169-007, Porto, Portugal; LACOMEPHI, GreenUPorto, Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences of University of Porto (FCUP), Rua do Campo Alegre 687, 4169-007, Porto, Portugal
| | - Luís Pinto da Silva
- Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Faculty of Sciences of University of Porto (FCUP), Rua do Campo Alegre 687, 4169-007, Porto, Portugal; LACOMEPHI, GreenUPorto, Department of Geosciences, Environment and Territorial Planning, Faculty of Sciences of University of Porto (FCUP), Rua do Campo Alegre 687, 4169-007, Porto, Portugal.
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16
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Bhosale R, Debnath B, Ogale S. Designing Nanoengineered Photocatalysts for Hydrogen Generation by Water Splitting and Conversion of Carbon Dioxide to Clean Fuels. CHEM REC 2022; 22:e202200110. [PMID: 35758532 DOI: 10.1002/tcr.202200110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/08/2022] [Indexed: 11/06/2022]
Abstract
Semiconductor photocatalysis has received tremendous attention in the past decade as it has shown great promise in the context of clean energy harvesting for environmental remediation. Sunlight is an inexhaustible source of energy available to us throughout the year, although it is rather dilutely dispersed. Semiconductor based photocatalysis presents one of the best ways to harness this source of energy to carry out chemical reactions of interest that require external energy input. Photocatalytic hydrogen generation by splitting of water, CO2 mitigation, and CO2 conversion to green fuel have therefore become the highly desirable clean and sustainable processes for a better tomorrow. Although numerous efforts have been made and continue to be expended to search and develop new classes of photocatalyst materials in recent years, several significant challenges still remain to be resolved before photocatalysis can reach its commercial potential. Therefore, major attention is required towards improving the efficiencies of the existing photocatalysts by further manipulating them and parallelly employing newer strategies for novel photocatalyst designs. This personal account aims to provide a broad overview of the field primarily invoking examples of our own research contributions in the field, which include photocatalytic hydrogen generation and CO2 reduction to value added chemicals. This account reviews the state-of-the-art research activities and scientific possibilities which a functional material can offer if its properties are put to best use through goal-oriented design by combining with other compatible materials. We have addressed fundamental principles of photocatalysis, different kind of functional photocatalysts, critical issues associated with them and various strategies to overcome the related hurdles. It is our hope that this current personal account will provide a platform for young researchers to address the bottleneck issues in the field of photocatalysis and photocatalysts with a sense of clarity, and to find innovative solutions to resolve them by a prudent choice of materials, synthesis protocols, and approaches to boost the photocatalysis output. We emphasize that a targeted or goal-directed photocatalyst nanoengineering as perhaps the only way to realize an early success in this multiparametric domain.
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Affiliation(s)
- Reshma Bhosale
- Department of Environmental Science, Savitribai Phule Pune University, Pune, 411007, India
| | - Bharati Debnath
- Research Institute for Sustainable Energy (TCG-CREST), Salt Lake, Kolkata, 700091, India
| | - Satishchandra Ogale
- Research Institute for Sustainable Energy (TCG-CREST), Salt Lake, Kolkata, 700091, India.,Department of Physics, Indian Institute for Science Education and Research, Dr. Homi Bhabha Road, Pune, 411008, India
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17
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Li X, Anwer S, Guan Q, Anjum DH, Palmisano G, Zheng L. Coupling Long-Range Facet Junction and Interfacial Heterojunction via Edge-Selective Deposition for High-Performance Z-Scheme Photocatalyst. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200346. [PMID: 35466563 PMCID: PMC9218749 DOI: 10.1002/advs.202200346] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/04/2022] [Indexed: 05/19/2023]
Abstract
The construction of photocatalytic systems that have strong redox capability, effective charge separation, and large reactive surfaces is of great scientific and practical interest. Herein, an edge-connected 2D/2D Z-scheme system that combines the facet junction and the interfacial heterojunction to achieve effective long-range charge separation and large reactive surface exposure is designed and fabricated. The heterostructure is realized by the selective growth of 2D-layered MoS2 nanoflakes on the edge-sites of thin TiO2 nanosheets via an Au-promoted photodeposition method. Attributed to the synergetic coupling of the facet junction and the interfacial heterojunction that assures the effective charge separation, and the tremendous but physically separated reactive sites offered by layered MoS2 and highly-exposed (001) facets of TiO2 , respectively, the artificial Z-scheme exhibits excellent photocatalytic performance in photodegradation tests. Moreover, the junctional plasmonic Au nanoclusters not only act as electron traps to promote the edge-selective synthesis but also generate "hot electrons" to further boost photocatalytic performance. The Z-scheme charge-flow direction in the heterostructure and the roles of electrons and holes are comprehensively studied using in situ irradiated X-ray photoelectron spectroscopy and photodegradation tests. This work offers a new insight into designing high-performance Z-scheme photocatalytic systems.
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Affiliation(s)
- Xuan Li
- Department of Mechanical EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
- Research and Innovation on CO2 and H2 (RICH) CenterKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
| | - Shoaib Anwer
- Department of Mechanical EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
| | - Qiangshun Guan
- Department of Mechanical EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
| | - Dalaver H. Anjum
- Department of PhysicsKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
| | - Giovanni Palmisano
- Research and Innovation on CO2 and H2 (RICH) CenterKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
- Department of Chemical EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
| | - Lianxi Zheng
- Department of Mechanical EngineeringKhalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates
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18
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Development of Monodisperse Mesoporous Microballs Composed of Decahedral Anatase Nanocrystals. Catalysts 2022. [DOI: 10.3390/catal12040408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
Mesoporous monodisperse microballs of amorphous titania were prepared from solution of absolute ethanol, tetrabutyl titanate (TBOT) and potassium chloride via a sub-zero sol–gel route. The as-obtained microballs were used as the precursor in an alcohothermal (ethanol with a small amount of water) process to synthesize monodisperse mesoporous microballs built of decahedral anatase nanocrystals. FE-SEM observation and XRD analysis have confirmed that the formed decahedral anatase-rich powder retained the original spherical morphology of the precursor. Importantly, a hierarchical structure composed of faceted anatase has been achieved under “green” conditions, i.e., fluorine-free. Additionally, the hysteresis loops (BET results) have confirmed the existence of mesopores. Interestingly, faceted microballs show noticeable photocatalytic activity under UV/vis irradiation for hydrogen generation without any co-catalyst use, reaching almost forty times higher activity than that by famous commercial titania photocatalyst—P25. It has been proposed that enhanced photocatalytic performance is caused by mesoporous structure and co-existence of two kinds of facets, i.e., {001} and {101}, and thus hindered charge carriers’ recombination.
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19
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Zaera F. Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts? Chem Rev 2022; 122:8594-8757. [PMID: 35240777 DOI: 10.1021/acs.chemrev.1c00905] [Citation(s) in RCA: 69] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A critical review of different prominent nanotechnologies adapted to catalysis is provided, with focus on how they contribute to the improvement of selectivity in heterogeneous catalysis. Ways to modify catalytic sites range from the use of the reversible or irreversible adsorption of molecular modifiers to the immobilization or tethering of homogeneous catalysts and the development of well-defined catalytic sites on solid surfaces. The latter covers methods for the dispersion of single-atom sites within solid supports as well as the use of complex nanostructures, and it includes the post-modification of materials via processes such as silylation and atomic layer deposition. All these methodologies exhibit both advantages and limitations, but all offer new avenues for the design of catalysts for specific applications. Because of the high cost of most nanotechnologies and the fact that the resulting materials may exhibit limited thermal or chemical stability, they may be best aimed at improving the selective synthesis of high value-added chemicals, to be incorporated in organic synthesis schemes, but other applications are being explored as well to address problems in energy production, for instance, and to design greener chemical processes. The details of each of these approaches are discussed, and representative examples are provided. We conclude with some general remarks on the future of this field.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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20
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Han JH, Shneidman AV, Kim DY, Nicolas NJ, Hoeven JES, Aizenberg M, Aizenberg J. Highly Ordered Inverse Opal Structures Synthesized from Shape‐Controlled Nanocrystal Building Blocks. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jae Hyo Han
- Department of Chemistry and Chemical Biology & John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Anna V. Shneidman
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Do Yoon Kim
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Natalie J. Nicolas
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Jessi E. S. Hoeven
- Department of Chemistry and Chemical Biology & John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Michael Aizenberg
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Joanna Aizenberg
- Department of Chemistry and Chemical Biology & John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
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21
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Liang Y, Xiang Z, Zhao X, Xiang F, Yan P, Yu T, Li X, Yang Y. Crystal facets effect of tin dioxide nanocrystals on photocatalytic degradation and photo-assisted gas sensing properties. CrystEngComm 2022. [DOI: 10.1039/d2ce00474g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crystal facets effects have been widely concerned in the field of photocatalysis and gas sensing in recent years. However, little attention have been paid to the crystal facets effect of...
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22
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Zan L, Zhang H, Ye Z, Wei Q, Dong H, Sun S, Weng Q, Bo X, Xia H, Li Y, Fu F. Solvent-induced crystal-facet effect of nickel-cobalt layered double hydroxide for highly efficient overall water splitting. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01470j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional layered materials have been universally acknowledged to be promising candidates for alternative precious metal in the field of catalysis. The crystal-facet effect is currently rare in the field of...
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23
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Lee MG, Yang JW, Kwon HR, Jang HW. Crystal facet and phase engineering for advanced water splitting. CrystEngComm 2022. [DOI: 10.1039/d2ce00585a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review covers the principles and recent advances in facet and phase engineering of catalysts for photocatalytic, photoelectrochemical, and electrochemical water splitting. It suggests the basis of catalyst design for advanced water splitting.
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Affiliation(s)
- Mi Gyoung Lee
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 1A4, Canada
| | - Jin Wook Yang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hee Ryeong Kwon
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea
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24
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25
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Han JH, Shneidman AV, Kim DY, Nicolas NJ, van der Hoeven JES, Aizenberg M, Aizenberg J. Highly Ordered Inverse Opal Structures Synthesized from Shape-Controlled Nanocrystal Building Blocks. Angew Chem Int Ed Engl 2021; 61:e202111048. [PMID: 34606677 DOI: 10.1002/anie.202111048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/27/2021] [Indexed: 01/29/2023]
Abstract
Three-dimensional ordered porous materials known as inverse opal films (IOFs) were synthesized using nanocrystals with precisely defined morphologies. Comprehensive theoretical and experimental studies of the volume fraction ratio and electrostatic interactions between nanocrystals and polystyrene templating particles enabled the formation of highly ordered crack-free photonic structures. The synthetic strategy was first demonstrated using titanium dioxide (TiO2 ) nanocrystals of different shapes and then generalized to assemble nanocrystals of other functional materials, such as indium tin oxide and zinc-doped ferrite. Tunable photocatalytic activity of the TiO2 IOFs, modulated through the choice of the shape of TiO2 nanocrystals in conjunction with selecting desired macroscopic features of the IOF, was further explored. In particular, enhanced activity is observed for crack-free, highly ordered IOFs whose photonic properties can improve light absorption via the slow light effect. This study opens new opportunities in designing multi-length-scale porous nanoarchitectures having enhanced performance in a variety of applications.
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Affiliation(s)
- Jae Hyo Han
- Department of Chemistry and Chemical Biology &, John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138, USA
| | - Anna V Shneidman
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Do Yoon Kim
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Natalie J Nicolas
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Jessi E S van der Hoeven
- Department of Chemistry and Chemical Biology &, John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138, USA
| | - Michael Aizenberg
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Joanna Aizenberg
- Department of Chemistry and Chemical Biology &, John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138, USA
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Ding W, Tan X, Chen G, Xu J, Yu K, Huang Y. Molecular-Level Insights on the Facet-Dependent Degradation of Perfluorooctanoic Acid. ACS APPLIED MATERIALS & INTERFACES 2021; 13:41584-41592. [PMID: 34433258 DOI: 10.1021/acsami.1c10136] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Perfluorooctanoic acid (PFOA) has raised significant health concerns due to its high ecotoxicological risks and difficulties in removal by conventional water treatment process. Previous studies have demonstrated that photocatalytic techniques exhibit great potential in PFOA removal. However, the underlying mechanism of the degradation process has not been fully understood, particularly the contribution of the facet effects of catalysts. In this study, a combination of experiments and first-principles calculations were conducted to shed light on the facet-dependence of the interfacial interactions and oxidation during the PFOA degradation process. We proved that the interfacial interaction was essential in initiating the hole-dominated degradation process, and the {110}R3̅c facet of hexagonal In2O3 features the strongest interaction with PFOA. The overall defluorination rate was mainly controlled by the hole-dominated oxidation processes under UV irradiation, which were further attributed to the electronic structures and reaction site distributions of different In2O3 surfaces. This study provides molecular-level insights on the facet-dependent PFOA catalytic degradation process, which can guide the rational design of photocatalysts to achieve superior decontamination efficiency.
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Affiliation(s)
- Wenhui Ding
- Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Xianjun Tan
- Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Guanhan Chen
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China
| | - Jingyi Xu
- Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Kuang Yu
- Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Yuxiong Huang
- Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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27
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Photocatalysis and Li-Ion Battery Applications of {001} Faceted Anatase TiO2-Based Composites. J 2021. [DOI: 10.3390/j4030038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Anatase TiO2 are the most widely used photocatalysts because of their unique electronic, optical and catalytic properties. Surface chemistry plays a very important role in the various applications of anatase TiO2 especially in the catalysis, photocatalysis, energy conversion and energy storage. Control of the surface structure by crystal facet engineering has become an important strategy for tuning and optimizing the physicochemical properties of TiO2. For anatase TiO2, the {001} crystal facets are the most reactive because they exhibit unique surface characteristics such as visible light responsiveness, dissociative adsorption, efficient charge separation capabilities and photocatalytic selectivity. In this review, a concise survey of the literature in the field of {001} dominated anatase TiO2 crystals and their composites is presented. To begin, the existing strategies for the synthesis of {001} dominated anatase TiO2 and their composites are discussed. These synthesis strategies include both fluorine-mediated and fluorine-free synthesis routes. Then, a detailed account of the effect of {001} facets on the physicochemical properties of TiO2 and their composites are reviewed, with a particular focus on photocatalysis and Li-ion batteries applications. Finally, an outlook is given on future strategies discussing the remaining challenges for the development of {001} dominated TiO2 nanomaterials and their potential applications.
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Khan R, Ali-Löytty H, Tukiainen A, Tkachenko NV. Comparison of the heat-treatment effect on carrier dynamics in TiO 2 thin films deposited by different methods. Phys Chem Chem Phys 2021; 23:17672-17682. [PMID: 34373878 DOI: 10.1039/d1cp02716f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polycrystalline titanium dioxide thin films are routinely used in a broad range of applications where charge carrier lifetime is essential for their performance but the effects of the fabrication method are rarely considered. Here we compare three popular deposition methods, atomic layer deposition (ALD), ion beam sputtering (IBS), and spray pyrolysis deposition (SPD). In all three cases, 30 nm thin films of TiO2 are prepared, and the as-deposited films show no defined crystal structure and can be classified as amorphous films. Heat treatment (HT) of the films converts all of them to polycrystalline anatase TiO2 as revealed by XRD measurements. A photophysical study was carried out by pico- to nano-second transient absorption pump-probe spectroscopy in transmittance and reflectance modes which allows taking into account the effects due to the photoinduced refractive index changes. This study shows that the HT increases the lifetime of the photo-carriers gradually to a nanosecond time domain (approx. 4 ns) as compared to a few picoseconds of the as-deposited samples. The photo-carrier dynamics of the samples become very similar after heat-treatment, though the topographical features and texture of the films observed with AFM and XRD are quite different. The measured transient absorption spectra of the samples also indicate that the photo-carrier relaxation pathway involves electron and hole trap states with the longest-lived being the hole traps. To evaluate the photoactivity of thin films, methylene blue (MB) photodegradation was tested for all the as-deposited and HT samples and the results showed a 20% higher degradation rate for the IBS HT sample due to the more textured surface.
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Affiliation(s)
- Ramsha Khan
- Photonic Compounds and Nanomaterials Group, Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 692, 33014 Tampere, Finland.
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29
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Wu JX, Zhu XR, Liang T, Zhang XD, Hou SZ, Xu M, Li YF, Gu ZY. Sn(101) Derived from Metal-Organic Frameworks for Efficient Electrocatalytic Reduction of CO 2. Inorg Chem 2021; 60:9653-9659. [PMID: 34133150 DOI: 10.1021/acs.inorgchem.1c00946] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of a specific Sn plane as an efficient electrocatalyst for CO2 electrochemical reduction to generate fuels and chemicals is still a huge challenge. Density functional theory (DFT) calculations first reveal that the Sn(101) crystal plane is more advantageous for CO2 electroreduction. A metal-organic framework (MOF) precursor Sn-MOF has been carbonized and then etched to successfully fabricate Sn(101)/SnO2/C composites with good control of the carbonization time and the concentration of hydrochloric acid. The Sn(101) crystal plane of the catalyst could enhance the faradaic efficiency of formate to as high as 93.3% and catalytic stability up to 20 h. The promotion of the selectivity and activity by Sn(101) advances new possibilities for the rational design of high-activity Sn catalysts derived from MOFs.
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Affiliation(s)
- Jian-Xiang Wu
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Xiao-Rong Zhu
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Ting Liang
- Orthopaedic Institute, Medical College, Soochow University, Suzhou, Jiangsu 215006, P. R. China
| | - Xiang-Da Zhang
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Shu-Zhen Hou
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Ming Xu
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Ya-Fei Li
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
| | - Zhi-Yuan Gu
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu 210023, P. R. China
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30
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Yu X, Xie J, Liu Q, Dong H, Li Y. The origin of enhanced photocatalytic activity in g-C3N4/TiO2 heterostructure revealed by DFT calculations. J Colloid Interface Sci 2021; 593:133-141. [DOI: 10.1016/j.jcis.2021.02.103] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 10/22/2022]
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Jiménez JM, Perdolt D, Berger T. Reactivity of Hydrogen-Related Electron Centers in Powders, Layers, and Electrodes Consisting of Anatase TiO 2 Nanocrystal Aggregates. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:13809-13818. [PMID: 34239660 PMCID: PMC8256420 DOI: 10.1021/acs.jpcc.1c01580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 05/06/2021] [Indexed: 05/04/2023]
Abstract
Anatase TiO2 nanoparticle aggregates were used as model systems for studying at different water activities the reactivity of electron centers at semiconductor surfaces. The investigated surface conditions evolve from a solid/vacuum interface to a solid/bulk electrolyte interface. Hydrogen-related electron centers were generated either chemically-upon sample exposure to atomic hydrogen at the semiconductor/gas interface-or electrochemically-upon bias-induced charge accumulation at the semiconductor/electrolyte interface. Based on their corresponding spectroscopic and electrochemical fingerprints, we investigated the reactivity of hydrogen-related electron centers as a function of the interfacial condition and at different levels of complexity, that is, (i) for dehydrated and (partially) dehydroxylated oxide surfaces, (ii) for oxide surfaces covered by a thin film of interfacial water, and (iii) for oxide surfaces in contact with a 0.1 M HClO4 aqueous solution. Visible (Vis) and infrared (IR) spectroscopy evidence a chemical equilibrium between hydrogen atoms in the gas phase and-following their dissociation-electron/proton centers in the oxide. The excess electrons are either localized forming (Vis-active) Ti3+ centers or delocalized as (IR-active) free conduction band electrons. The addition of molecular oxygen to chemically reduced anatase TiO2 nanoparticle aggregates leads to a quantitative quenching of Ti3+ centers, while a fraction of ∼10% of hydrogen-derived conduction band electrons remains in the oxide pointing to a persistent hydrogen doping of the semiconductor. Neither trapped electrons (i.e., Ti3+ centers) nor conduction band electrons react with water or its adsorption products at the oxide surface. However, the presence of an interfacial water layer does not impede the electron transfer to molecular oxygen. At the semiconductor/electrolyte interface, inactivity of trapped electrons with regard to water reduction and electron transfer to oxygen were evidenced by cyclic voltammetry.
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Affiliation(s)
- Juan Miguel Jiménez
- Department
of Chemistry and Physics of Materials, University
of Salzburg, Jakob-Haringer-Strasse 2a, A-5020 Salzburg, Austria
| | - Daniel Perdolt
- Department
of Chemistry and Physics of Materials, University
of Salzburg, Jakob-Haringer-Strasse 2a, A-5020 Salzburg, Austria
| | - Thomas Berger
- Department
of Chemistry and Physics of Materials, University
of Salzburg, Jakob-Haringer-Strasse 2a, A-5020 Salzburg, Austria
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32
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Ma D, Yi H, Lai C, Liu X, Huo X, An Z, Li L, Fu Y, Li B, Zhang M, Qin L, Liu S, Yang L. Critical review of advanced oxidation processes in organic wastewater treatment. CHEMOSPHERE 2021; 275:130104. [PMID: 33984911 DOI: 10.1016/j.chemosphere.2021.130104] [Citation(s) in RCA: 180] [Impact Index Per Article: 60.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 05/19/2023]
Abstract
With the development of industrial society, organic wastewater produced by industrial manufacturing has caused many environmental problems. The vast majority of organic pollutants in water bodies are persistent in the environment, posing a threat to human and animal health. Therefore, efficient treatment methods for highly concentrated organic wastewater are urgently needed. Advanced oxidation processes (AOPs) are widely noticed in the area of treating organic wastewater. Compared with other chemical methods, AOPs have the characteristics of high oxidation efficiency and no secondary pollution. In this paper, the mechanisms, advantages, and limitations of AOPs are comprehensively reviewed. Besides, the basic principles of combining different AOPs to enhance the treatment efficiency are described. Furthermore, the applications of AOPs in various wastewater treatments, such as oily wastewater, dyeing wastewater, pharmaceutical wastewater, and landfill leachate, are also presented. Finally, we conclude that the main direction in the future of AOPs are the modification of catalysts and the optimization of operating parameters, with the challenges focusing on industrial applications.
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Affiliation(s)
- Dengsheng Ma
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Huan Yi
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Cui Lai
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China.
| | - Xigui Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Xiuqin Huo
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Ziwen An
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Ling Li
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Yukui Fu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Bisheng Li
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Mingming Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Lei Qin
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Shiyu Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Lu Yang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
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Paumo HK, Dalhatou S, Katata-Seru LM, Kamdem BP, Tijani JO, Vishwanathan V, Kane A, Bahadur I. TiO2 assisted photocatalysts for degradation of emerging organic pollutants in water and wastewater. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115458] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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34
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Gul A, Ullah R, Sun J, Munir T, Bai S. The fabrication of TiO 2-supported clinoptilolite via F - contained hydrothermal etching and a resultant highly energetic {001} facet for the enhancement of its photocatalytic activity. RSC Adv 2021; 11:17849-17859. [PMID: 35480182 PMCID: PMC9033245 DOI: 10.1039/d1ra02269e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/03/2021] [Indexed: 01/19/2023] Open
Abstract
TiO2-supported clinoptilolite (TiO2/CP) was synthesized in the presence of F− ions. Various characterizations demonstrated that the particle size of loaded TiO2 increased linearly with an increase in the temperature and concentration of F− ions. In particular, the additive F− ions were favored to produce the mutually independent co-exposed {001} and {101} facets of loaded TiO2, while TiO2/CPs synthesized in the absence of F− ions were dominated by the thermodynamically stable {101} facet. As photocatalysts for the removal of crystal violet or methyl orange dyes under UV-irradiation in aqueous solutions, TiO2/CPs (ACP6) synthesized in the presence of F− ions significantly improved the degradation efficiency, as compared to ACP3 obtained in the absence of F− ions. These results elucidated that the highly energetic {001} exposed facet, large particle size and fine dispersion of loaded TiO2 in TiO2/CP accounts for its best photocatalytic performance. The effected mechanism of operational parameters on the degradation performances is proposed. TiO2-supported clinoptilolite (TiO2/CP) was synthesized in the presence of F− ions.![]()
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Affiliation(s)
- Anadil Gul
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental and Chemical Engineering, Beijing University of Technology Beijing 100124 P. R. China
| | - Raza Ullah
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental and Chemical Engineering, Beijing University of Technology Beijing 100124 P. R. China
| | - Jihong Sun
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental and Chemical Engineering, Beijing University of Technology Beijing 100124 P. R. China
| | - Tallat Munir
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental and Chemical Engineering, Beijing University of Technology Beijing 100124 P. R. China
| | - Shiyang Bai
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Environmental and Chemical Engineering, Beijing University of Technology Beijing 100124 P. R. China
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35
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dos Santos RM, da Cunha WF, Giozza WF, de Sousa Júnior RT, Roncaratti LF, Ribeiro Júnior LA. Electronic and structural properties of Janus MoSSe/MoX2 (X = S,Se) in-plane heterojunctions: A DFT study. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Atomic Level Interface Control of SnO2-TiO2 Nanohybrids for the Photocatalytic Activity Enhancement. Catalysts 2021. [DOI: 10.3390/catal11020205] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
This review article highlights atom-level control of the heterojunction and homojunction in SnO2-TiO2 nanohybrids, and the effects on the photocatalytic property. Firstly, a comprehensive description about the origin for the SnO2-TiO2 coupling effect on the photocatalytic activity in the conventional SnO2-TiO2 system without heteroepitaxial junction is provided. Recently, a bundle of thin SnO2 nanorods was hetero-epitaxially grown from rutile TiO2 seed nanocrystals (SnO2-NR#TiO2, # denotes heteroepitaxial junction). Secondly, the heterojunction effects of the SnO2-NR#TiO2 system on the photocatalytic activity are dealt with. A novel nanoscale band engineering through the atom-level control of the heterojunction between SnO2 and TiO2 is presented for the photocatalytic activity enhancement. Thirdly, the homojunction effects of the SnO2 nanorods on the photocatalytic activity of the SnO2-NR#TiO2 system and some other homojunction systems are discussed. Finally, we summarize the conclusions with the possible future subjects and prospects.
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37
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Joutsuka T, Yoshinari H, Yamauchi S. Facet Dependence of Photocatalytic Activity in Anatase TiO 2: Combined Experimental and DFT Study. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200236] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Tatsuya Joutsuka
- Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan
| | - Hiroto Yoshinari
- Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan
| | - Satoshi Yamauchi
- Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University, Hitachi, Ibaraki 316-8511, Japan
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38
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Balapure A, Ganesan R. Anatase versus Triphasic TiO 2: Near-identical synthesis and comparative structure-sensitive photocatalytic degradation of methylene blue and 4-chlorophenol. J Colloid Interface Sci 2021; 581:205-217. [PMID: 32771732 DOI: 10.1016/j.jcis.2020.07.096] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/12/2020] [Accepted: 07/19/2020] [Indexed: 01/17/2023]
Abstract
Studies on photocatalytic activity of monophasic and biphasic TiO2 have been well explored. However, detailed studies on the photocatalytic activity of triphasic titania, as opposed to monophasic or biphasic TiO2 are scarce. Here we report a comparative structure-sensitive photocatalytic study of triphasic versus anatase TiO2, both have been synthesized under near-identical conditions through a customized sol-gel approach. The composition of the phases is tuned just by varying the thermal pre-treatment conditions of TiO2 gel that has been subsequently subjected to calcination at 300 °C. Interestingly, when the pre-treatment temperature of the gel is systematically increased from 50 to 250 °C, a transition from anatase to triphasic (anatase, rutile, and brookite) and then again to anatase has been observed. The synthesized TiO2 phase compositions have been thoroughly characterized for their structural, optical, electrical, surface and morphological properties. Among the different phase compositions, triphasic titania having a significant proportion of rutile has been found to exhibit the highest photocatalytic activity, as probed using model organic pollutants, Methylene Blue (MB) and 4-Chlorophenol (4-CP). In addition to the earlier known factors such as effective heterojunction, and favorable position of the valence band (VB), an important contribution to the high photocatalytic activity of triphasic TiO2 has been experimentally found to stem from the additional electron density in VB that is attributed to the lattice contraction of anatase phase owing to the coexistence of other two phases. The study provides fundamental insights into the energetics that impact the photocatalytic activity of triphasic versus anatase TiO2.
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Affiliation(s)
- Aniket Balapure
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
| | - Ramakrishnan Ganesan
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India.
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39
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Hu K, E L, Li W, Lai L, Zhao D, Zhao W, Xu R. Effect of reactant sequence on the structure and properties of self-assembled TiO 2 microspheres with exposed {001} surfaces. CrystEngComm 2021. [DOI: 10.1039/d0ce01515f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly exposed {001} surfaces of ITD-TiO2 and IDT-TiO2 microspheres with self-assembled hierarchical structure were prepared by the two-step hydrothermal method. The degradation rate of MO by ITD-TiO2 was 99.0% after UV-light irradiation for 3.0 h.
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Affiliation(s)
- Kangkai Hu
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
| | - Lei E
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
| | - Wei Li
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- China International Engineering Consulting Corporation
| | - Liuyuan Lai
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
| | - Dan Zhao
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
| | - Wei Zhao
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
| | - Rui Xu
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
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40
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Rudel HE, Lane MKM, Muhich CL, Zimmerman JB. Toward Informed Design of Nanomaterials: A Mechanistic Analysis of Structure-Property-Function Relationships for Faceted Nanoscale Metal Oxides. ACS NANO 2020; 14:16472-16501. [PMID: 33237735 PMCID: PMC8144246 DOI: 10.1021/acsnano.0c08356] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Nanoscale metal oxides (NMOs) have found wide-scale applicability in a variety of environmental fields, particularly catalysis, gas sensing, and sorption. Facet engineering, or controlled exposure of a particular crystal plane, has been established as an advantageous approach to enabling enhanced functionality of NMOs. However, the underlying mechanisms that give rise to this improved performance are often not systematically examined, leading to an insufficient understanding of NMO facet reactivity. This critical review details the unique electronic and structural characteristics of commonly studied NMO facets and further correlates these characteristics to the principal mechanisms that govern performance in various catalytic, gas sensing, and contaminant removal applications. General trends of facet-dependent behavior are established for each of the NMO compositions, and selected case studies for extensions of facet-dependent behavior, such as mixed metals, mixed-metal oxides, and mixed facets, are discussed. Key conclusions about facet reactivity, confounding variables that tend to obfuscate them, and opportunities to deepen structure-property-function understanding are detailed to encourage rational, informed design of NMOs for the intended application.
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Affiliation(s)
- Holly E Rudel
- Department of Chemical and Environmental Engineering, Yale University, 17 Hillhouse Avenue, New Haven, Connecticut 06511, United States
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United States
| | - Mary Kate M Lane
- Department of Chemical and Environmental Engineering, Yale University, 17 Hillhouse Avenue, New Haven, Connecticut 06511, United States
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United States
| | - Christopher L Muhich
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United States
- School for the Engineering of Matter, Transport, and Energy, Ira A Fulton Schools of Engineering, Arizona State University, Tempe, Arizona 85001, United States
| | - Julie B Zimmerman
- Department of Chemical and Environmental Engineering, Yale University, 17 Hillhouse Avenue, New Haven, Connecticut 06511, United States
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), Yale University, New Haven, Connecticut 06511, United States
- School of Forestry and Environmental Studies, Yale University, 195 Prospect Street, New Haven, Connecticut 06511, United States
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41
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Sun J, Sun J, Wang X. Anatase TiO
2
with Co‐exposed (001) and (101) Surface‐Based Photocatalytic Materials for Energy Conversion and Environmental Purification. Chem Asian J 2020; 15:4168-4183. [DOI: 10.1002/asia.202001085] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/28/2020] [Indexed: 01/15/2023]
Affiliation(s)
- Jingjing Sun
- School of Environmental Science and Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 P. R. China
| | - Jing Sun
- School of Environmental Science and Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 P. R. China
| | - Xikui Wang
- School of Environmental Science and Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 P. R. China
- Shandong Agriculture and Engineering University Ji'nan 250100 P. R. China
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42
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Wu ZG, Ren ZM, Li L, Lv L, Chen Z. Hydrothermal synthesis of TiO2 quantum dots with mixed titanium precursors. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117328] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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43
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Yu J, Godiksen AL, Mamahkel A, Søndergaard-Pedersen F, Rios-Carvajal T, Marks M, Lock N, Rasmussen SB, Iversen BB. Selective Catalytic Reduction of NO Using Phase-Pure Anatase, Rutile, and Brookite TiO2 Nanocrystals. Inorg Chem 2020; 59:15324-15334. [DOI: 10.1021/acs.inorgchem.0c02304] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jinlong Yu
- Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark
| | | | - Aref Mamahkel
- Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark
| | | | | | - Melissa Marks
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus, Denmark
| | - Nina Lock
- Department of Engineering, Aarhus University, DK-8000 Aarhus, Denmark
| | | | - Bo Brummerstedt Iversen
- Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark
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44
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Fracchia M, Ghigna P, Minguzzi A, Vertova A, Turco F, Cerrato G, Meroni D. Role of Synthetic Parameters on the Structural and Optical Properties of N,Sn-Copromoted Nanostructured TiO 2: A Combined Ti K-Edge and Sn L 2,3-Edges X-ray Absorption Investigation. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1224. [PMID: 32585978 PMCID: PMC7353116 DOI: 10.3390/nano10061224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 11/17/2022]
Abstract
Sn-modification of TiO2 photocatalysts has been recently proposed as a suitable strategy to improve pollutant degradation as well as hydrogen production. In particular, visible light activity could be promoted by doping with Sn2+ species, which are, however, thermally unstable. Co-promotion with N and Sn has been shown to lead to synergistic effects in terms of visible light activity, but the underlying mechanism has, so far, been poorly understood due to the system complexity. Here, the structural, optical, and electronic properties of N,Sn-copromoted, nanostructured TiO2 from sol-gel synthesis were investigated: the Sn/Ti molar content was varied in the 0-20% range and different post-treatments (calcination and low temperature hydrothermal treatment) were adopted in order to promote the sample crystallinity. Depending on the adopted post-treatment, the optical properties present notable differences, which supports a combined role of Sn dopants and N-induced defects in visible light absorption. X-ray absorption spectroscopy at the Ti K-edge and Sn L2,3-edges shed light onto the electronic properties and structure of both Ti and Sn species, evidencing a marked difference at the Sn L2,3-edges between the samples with 20% and 5% Sn/Ti ratio, showing, in the latter case, the presence of tin in a partially reduced state.
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Affiliation(s)
- Martina Fracchia
- Department of Chemistry, Università degli Studi di Pavia, via Taramelli 12, 27100 Pavia, Italy;
| | - Paolo Ghigna
- Department of Chemistry, Università degli Studi di Pavia, via Taramelli 12, 27100 Pavia, Italy;
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
| | - Alessandro Minguzzi
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
- Department of Chemistry, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
| | - Alberto Vertova
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
- Department of Chemistry, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
| | - Francesca Turco
- Department of Chemistry and NIS, Inter-Departmental Center, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy; (F.T.); (G.C.)
| | - Giuseppina Cerrato
- Department of Chemistry and NIS, Inter-Departmental Center, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy; (F.T.); (G.C.)
| | - Daniela Meroni
- Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121 Florence, Italy; (A.M.); (A.V.)
- Department of Chemistry, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
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45
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Effects of Matching Facet Pairs of TiO
2
on Photoelectrochemical Water Splitting Behaviors. ChemCatChem 2020. [DOI: 10.1002/cctc.201901857] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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He Y, Yan Q, Liu X, Dong M, Yang J. Effect of annealing on the structure, morphology and photocatalytic activity of surface-fluorinated TiO2 with dominant {001} facets. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112400] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Chang Y, Han W, Cui S, Cai A. Cellulose-inspired synthesis of hierarchically nanostructured TiO2 with high photocatalytic activity. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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48
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Ge W, Jiao S, Chang Z, He X, Li Y. Ultrafast Response and High Selectivity toward Acetone Vapor Using Hierarchical Structured TiO 2 Nanosheets. ACS APPLIED MATERIALS & INTERFACES 2020; 12:13200-13207. [PMID: 32096401 DOI: 10.1021/acsami.9b23181] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
For the development of high-performance gas sensors, ultrafast response and high selectivity are critical requirements for many practical applications. An alternative strategy is to employ hierarchical nanostructured materials in gas sensors. In this work, we report newly synthesized TiO2 hexagonal nanosheets with a hierarchical porous structure, which demonstrate an ultrafast gas response and high selectivity toward acetone vapor for the first time. A simple one-step annealing process to prepare hierarchical TiO2 nanosheets derived from layered TiSe2 nanosheet templates is reported. The hierarchical structure interlaced with anatase TiO2 nanosheets showed an open porous characteristic. The average pore size was about 20 nm examined using a high-resolution TEM. The gas sensing properties toward acetone vapor of the novel hierarchical structured TiO2 nanosheets were characterized in detail including optimal operation temperature, sensitivity, selectivity, response/recovery time, and long-term stability. The gas sensing response and recovery times were 0.75 s and 0.5 s, respectively. We attribute these superior response properties to its unique hierarchical pore structure with a high specific surface area. The results show great potential for acetone vapor detection, particularly in dynamic ultrafast monitoring by using the synthesized hierarchical structured TiO2 nanosheets.
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Affiliation(s)
- Wanyin Ge
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Siyi Jiao
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Zhe Chang
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Xuanmeng He
- School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Yongxiang Li
- School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
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49
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Das T, Datta S. Thermochemical stability, and electronic and dielectric properties of Janus bismuth oxyhalide BiOX (X = Cl, Br, I) monolayers. NANOSCALE ADVANCES 2020; 2:1090-1104. [PMID: 36133068 PMCID: PMC9417667 DOI: 10.1039/c9na00750d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 02/06/2020] [Indexed: 06/11/2023]
Abstract
Ultrathin monolayers of bismuth oxyhalide materials BiOX (X = Cl, Br, I) grown along 〈001〉 are studied using first-principles density functional theory. Both pristine BiOX and Janus (X, X' = Cl, Br, I) monolayers are investigated by analyzing their structural stability using formation enthalpy and phonon density of states. On the other hand, their thermochemical reactivity is understood from their surface energy trends in symmetric and asymmetric terminations. The theoretically measured optical band gaps and fundamental band gaps of these Janus monolayers are compared with their pristine counterparts BiOX and BiOX' as well as to the known experimental measurements. All of the possible Janus monolayers possess structural, electronic and optical properties intermediate to the corresponding properties of the two associated pristine BiOX and BiOX' monolayers. According to the formation enthalpy, stabilization is equally favorable for all the monolayers, whereas the lowest surface energy is found for BiOCl0.5Br0.5, leading to excellent thermochemical reactivity which is consistent with recent experimental measurements. The frequency dependent dielectric functions are simulated in the density functional perturbation theory limit, and the optical band gaps are estimated from the absorption and reflectance spectra, and are in excellent agreement with the known experimentally measured values. High frequency dielectric constants of these materials with 2D symmetry are estimated from G 0 W 0 calculations including local field and spin-orbit effects. The larger dielectric constants and wider differences in the charge carriers' effective masses also provide proof that this new class of 2D materials has potential in photo-electrochemical applications. Thus, fabricating Janus monolayers of these oxyhalide compounds would open up a rational design strategy for tailoring their optoelectronic properties, which may offer guidance for the design of highly efficient optoelectronic materials for catalysis, valleytronic, and sensing applications.
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Affiliation(s)
- Tilak Das
- Università degli Studi Milano-Bicocca, Dipartimento di Scienza dei Materiali via R. Cozzi, 55 Milano - 20125 Italy
| | - Soumendu Datta
- Department of Condensed Matter Physics and Material Sciences, Satyendra Nath Bose National Centre for Basic Sciences JD Block, Sector-III, Salt Lake City Kolkata - 700 106 India
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50
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Kumar A, Khan M, He J, Lo IMC. Recent developments and challenges in practical application of visible-light-driven TiO 2-based heterojunctions for PPCP degradation: A critical review. WATER RESEARCH 2020; 170:115356. [PMID: 31816569 DOI: 10.1016/j.watres.2019.115356] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/27/2019] [Accepted: 11/29/2019] [Indexed: 06/10/2023]
Abstract
The ability of the TiO2-based photocatalysis process to mineralize organic pollutants has attracted attention worldwide for the degradation of recalcitrant pharmaceuticals and personal care products (PPCPs). Nevertheless, (1) the limited exploitation of the solar spectrum, i.e., activation under UV light (only 2-3% of solar spectrum), and (2) the high recombination rate of photo-generated charge carriers, i.e., electrons and holes, have limited its application which can, however, be improved by developing a TiO2-based heterojunction. The objective of this critical review paper is to discuss the recent developments (2009-2019) in visible-light-driven (VLD) TiO2-based heterojunctions for PPCP degradation and their degradation mechanisms. Compared to the conventional heterojunctions, Schottky and Z-scheme heterojunctions, which are non-conventional heterojunctions, are found to be more effective for PPCP degradation due to their more efficient separation of charge carriers and the occurrence of redox reactions at a relatively higher redox potential. Furthermore, the enhancement strategies for the development of a VLD TiO2-based heterojunction are also explored which can be achieved by selecting the (1) highly photocatalytically active {001} facet of anatase TiO2, (2) synthesis methods governing the structural changes at the junction interface, and (3) heterojunction components which can efficiently generate the powerful •OH radicals. The challenges in practical applications are also discussed which include factors, viz., cost reduction, recycling, stability, byproducts analysis, evaluation of the environmental effectiveness, and reactor design and scale-up of the VLD TiO2-based heterojunctions. Accordingly, the prospects of VLD TiO2-based heterojunctions for PPCP degradation in real environmental applications are discussed.
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Affiliation(s)
- Ashutosh Kumar
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Musharib Khan
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Juhua He
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Irene M C Lo
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China; Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong, China.
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