1
|
Xue T, Li J, Chen L, Li K, Hua Y, Yang Y, Dong F. Photocatalytic NO x removal and recovery: progress, challenges and future perspectives. Chem Sci 2024; 15:9026-9046. [PMID: 38903227 PMCID: PMC11186336 DOI: 10.1039/d4sc01891e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Accepted: 05/18/2024] [Indexed: 06/22/2024] Open
Abstract
The excessive production of nitrogen oxides (NO x ) from energy production, agricultural activities, transportation, and other human activities remains a pressing issue in atmospheric environment management. NO x serves both as a significant pollutant and a potential feedstock for energy carriers. Photocatalytic technology for NO x removal and recovery has received widespread attention and has experienced rapid development in recent years owing to its environmental friendliness, mild reaction conditions, and high efficiency. This review systematically summarizes the recent advances in photocatalytic removal, encompassing NO x oxidation removal (including single and synergistic removal and NO3 - decomposition), NO x reduction to N2, and the emergent NO x upcycling into green ammonia. Special focus is given to the molecular understanding of the interfacial nitrogen-associated reaction mechanisms and their regulation pathways. Finally, the status and the challenges of photocatalytic NO x removal and recovery are critically discussed and future outlooks are proposed for their potential practical application.
Collapse
Affiliation(s)
- Ting Xue
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China Chengdu 611731 China
| | - Jing Li
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China Chengdu 611731 China
| | - Lvcun Chen
- School of Environmental Science and Engineering, Southwest Jiaotong University Chengdu 611756 China
| | - Kanglu Li
- School of Environmental Science and Engineering, Southwest Jiaotong University Chengdu 611756 China
| | - Ying Hua
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China Chengdu 611731 China
| | - Yan Yang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology Guangzhou 510006 China
- Synergy Innovation Institute of GDUT Shantou 515041 Guangdong China
| | - Fan Dong
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China Chengdu 611731 China
| |
Collapse
|
2
|
Suib SL, Přech J, Szaniawska E, Čejka J. Recent Advances in Tetra- (Ti, Sn, Zr, Hf) and Pentavalent (Nb, V, Ta) Metal-Substituted Molecular Sieve Catalysis. Chem Rev 2023; 123:877-917. [PMID: 36547404 DOI: 10.1021/acs.chemrev.2c00509] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Metal substitution of molecular sieve systems is a major driving force in developing novel catalytic processes to meet current demands of green chemistry concepts and to achieve sustainability in the chemical industry and in other aspects of our everyday life. The advantages of metal-substituted molecular sieves include high surface areas, molecular sieving effects, confinement effects, and active site and morphology variability and stability. The present review aims to comprehensively and critically assess recent advances in the area of tetra- (Ti, Sn, Zr, Hf) and pentavalent (V, Nb, Ta) metal-substituted molecular sieves, which are mainly characterized for their Lewis acidic active sites. Metal oxide molecular sieve materials with properties similar to those of zeolites and siliceous molecular sieve systems are also discussed, in addition to relevant studies on metal-organic frameworks (MOFs) and some composite MOF systems. In particular, this review focuses on (i) synthesis aspects determining active site accessibility and local environment; (ii) advances in active site characterization and, importantly, quantification; (iii) selective redox and isomerization reaction applications; and (iv) photoelectrocatalytic applications.
Collapse
Affiliation(s)
- Steven L Suib
- Departments of Chemistry and Chemical and Biomolecular Engineering, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Jan Přech
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Ewelina Szaniawska
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Prague 2, Czech Republic
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43 Prague 2, Czech Republic
| |
Collapse
|
3
|
Li N, Wang C, Zhang K, Lv H, Yuan M, Bahnemann DW. Progress and prospects of photocatalytic conversion of low-concentration NO. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(22)64139-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
4
|
Baniamerian H, Teimoori M, Saberi M. Fe
2
O
3
/TiO
2
/Activated Carbon Nanocomposite with Synergistic Effect of Adsorption and Photocatalysis. Chem Eng Technol 2020. [DOI: 10.1002/ceat.202000403] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hamed Baniamerian
- Iranian Research Organization for Science and Technology Department of Chemical Technologies Ehsani Rad st. 3353-5111 Tehran Iran
| | - Mostafa Teimoori
- Persian Gulf University Department of Petroleum Gas and Petrochemical Engineering Daneshgah st. 7516913817 Bushehr Iran
| | - Masoud Saberi
- Islamic Azad University Department of Chemical Engineering, Bushehr Branch Bushehr Iran
| |
Collapse
|
5
|
Li Q, Anpo M, Wang X. Application of photoluminescence spectroscopy to elucidate photocatalytic reactions at the molecular level. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04209-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
6
|
Micro Flowers of SrS/Bi2S3 Nanocomposite and Its Field Emission Properties. JOURNAL OF COMPOSITES SCIENCE 2019. [DOI: 10.3390/jcs3040105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The three-dimensional hierarchical SrS/Bi2S3 heterostructures were synthesized by a template-free single-step hydrothermal method. The structural and morphological studies revealed the formation of a single crystalline orthorhombic heterostructure with rod-like morphologies possessing a high aspect ratio. The field emission properties of SrS/Bi2S3 nanorods were investigated. J–E and the Fowler–Nordheim (F–N) plot, as well as long-term field emission (FE) stability, were studied. SrS/Bi2S3 nanoflowers have enhanced the FE properties more than the virgin Bi2S3. The observed values of the re-producible turn-on field for SrS/Bi2S3 defined to draw an emission current density of ca. 1 µA/cm2 were found to be ca. 2.50 V/µm, and of the threshold field to draw a current density of ca. 10 µA/cm2 were found to be ca. 3.00 V/µm (without visible light illumination). A maximum emission current density of ca. 527 μA/cm2 was drawn without light and a current density of ca. 1078 μA/cm2 with light, which is higher than that of pristine Bi2S3.
Collapse
|
7
|
Jia W, Liu T, Li Q, Yang J. Highly efficient photocatalytic reduction of CO2 on surface-modified Ti-MCM-41 zeolite. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.11.046] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
8
|
Suárez S, Jansson I, Ohtani B, Sánchez B. From titania nanoparticles to decahedral anatase particles: Photocatalytic activity of TiO2/zeolite hybrids for VOCs oxidation. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.09.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
9
|
Gomathi Devi L, Nithya PM. Photocatalytic activity of Hemin (Fe(iii) porphyrin) anchored BaTiO3 under the illumination of visible light: synergetic effects of photosensitization, photo-Fenton & photocatalysis processes. Inorg Chem Front 2018. [DOI: 10.1039/c7qi00590c] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The robust photocatalytic efficiency of hemin anchored BaTiO3 is due to the synergetic effect among photosensitization, reactive 1O2 and redox reactions involving Fe2+/Fe3+.
Collapse
Affiliation(s)
- L. Gomathi Devi
- Department of Post-Graduate Studies in Chemistry
- Central College City Campus
- Dr. Ambedkar Street
- Bangalore University
- Bangalore-560001
| | - P. M. Nithya
- Department of Post-Graduate Studies in Chemistry
- Central College City Campus
- Dr. Ambedkar Street
- Bangalore University
- Bangalore-560001
| |
Collapse
|
10
|
Chen Y, Liu K. Fabrication of Ce/N co-doped TiO 2/diatomite granule catalyst and its improved visible-light-driven photoactivity. JOURNAL OF HAZARDOUS MATERIALS 2017; 324:139-150. [PMID: 27776863 DOI: 10.1016/j.jhazmat.2016.10.043] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 10/17/2016] [Accepted: 10/19/2016] [Indexed: 06/06/2023]
Abstract
Eliminating antibiotic remnants in aquatic environment has become one of the hottest topics among current research works. Thus, we prepared Ce, N co-doped TiO2/diatomite granule (CNTD-G) catalyst to provide a new method. As one typical antibiotics, oxytetracycline (OTC) was selected as the target pollutant to be degradated under visible light irradiation. The carrier diatomite helped the spread of TiO2 nanoparticles onto its surface, and inhibited their agglomeration. The synergy of Ce and N dopants highly improved the visible-light-driven photoactivity of TiO2. The optimal doping amount and degradation conditions were determined. Besides, the effects of impurity ions were also investigated, including cations: Ca2+, Mg2+; or anions: NO3-, SO42- and PO43-. The intermediates generated during degradation process were studied, and the mechanism of the photodegradation process was proposed. CNTD-G could be easily collected from the reactor, and showed excellent recyclability.
Collapse
Affiliation(s)
- Yan Chen
- School of Metallurgy, Northeastern University, Shenyang, 110819, PR China
| | - Kuiren Liu
- School of Metallurgy, Northeastern University, Shenyang, 110819, PR China.
| |
Collapse
|
11
|
Mikhaylov RV, Glazkova NI, Nikitin KV. Photostimulated oxygen isotope exchange between N18O and anatase TiO2 under light irradiation. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.09.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
12
|
Yu H, Ye L, Zhang T, Zhou H, Zhao T. Synthesis, characterization and immobilization of N-doped TiO2 catalysts by a reformed polymeric precursor method. RSC Adv 2017. [DOI: 10.1039/c6ra27187a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Catalysts coated quartz fabric with favorable photocatalytic activity were prepared to avoid the difficulties in its recycle and reuse.
Collapse
Affiliation(s)
- Han Yu
- Laboratory of Advanced Polymer Materials
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Li Ye
- Laboratory of Advanced Polymer Materials
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Tuzi Zhang
- Laboratory of Advanced Polymer Materials
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Heng Zhou
- Laboratory of Advanced Polymer Materials
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Tong Zhao
- Laboratory of Advanced Polymer Materials
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| |
Collapse
|
13
|
AgBr@TiO2/GO ternary composites with enhanced photocatalytic activity for oxidation of benzyl alcohol to benzaldehyde. RESEARCH ON CHEMICAL INTERMEDIATES 2016. [DOI: 10.1007/s11164-016-2747-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
14
|
Anilkumar MR, Nagaswarupa HP, Nagabhushana H, Sharma SC, Vidya YS, Anantharaju KS, Prashantha SC, Shivakuamra C, Gurushantha K. Bio-inspired route for the synthesis of spherical shaped MgO:Fe(3+) nanoparticles: Structural, photoluminescence and photocatalytic investigation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 149:703-713. [PMID: 25988816 DOI: 10.1016/j.saa.2015.05.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Revised: 04/20/2015] [Accepted: 05/04/2015] [Indexed: 06/04/2023]
Abstract
MgO:Fe(3+) (0.1-5 mol%) nanoparticles (NPs) were synthesized via eco-friendly, inexpensive and simple low temperature solution combustion route using Aloe vera gel as fuel. The final products were characterized by SEM, TEM and HRTEM. PXRD data and Rietveld analysis revealed the formation of cubic system. The influence of Fe(3+) ion concentration on the structure morphology, UV absorption, PL emission and photocatalytic activity of MgO:Fe(3+) NPs were investigated. The yellow emission with CIE chromaticity coordinates (0.44, 0.52) and average correlated color temperature value was found to be 3540 K which corresponds to warm light of NPs. The control of Fe(3+) on MgO matrix influences the photocatalytic decolorization of methylene blue (MB) under UV light. The enhanced photocatalytic activity of MgO:Fe(3+) (4 mol%) was attributed to dopant concentration, effective crystallite size, textural properties, decreased band gap and capability for reducing the electron-hole pair recombination. Further, the trends of inhibitory effect in the presence of different radical scavengers were explored. These findings open up new avenues for the exploration of Fe-doped MgO in eco-friendly water applications and in the process of display devices.
Collapse
Affiliation(s)
- M R Anilkumar
- Department of Science, Research Center, East West Institute of Technology, Bangalore 560 091, India
| | - H P Nagaswarupa
- Department of Science, Research Center, East West Institute of Technology, Bangalore 560 091, India.
| | - H Nagabhushana
- Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India
| | - S C Sharma
- Dayananda Sagar University, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore 560078, Karnataka, India
| | - Y S Vidya
- Department of Physics, Lal Bahadur Shastry Government First Grade College, Bangalore 560 032, India.
| | - K S Anantharaju
- Department of Science, Research Center, East West Institute of Technology, Bangalore 560 091, India.
| | - S C Prashantha
- Department of Science, Research Center, East West Institute of Technology, Bangalore 560 091, India
| | - C Shivakuamra
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
| | - K Gurushantha
- Department of Science, Research Center, East West Institute of Technology, Bangalore 560 091, India
| |
Collapse
|
15
|
Legrand A, Moissette A, Hureau M, Casale S, Massiani P, Vezin H, Mamede AS, Batonneau-Gener I. Electron transfers in a TiO2-containing MOR zeolite: synthesis of the nanoassemblies and application using a probe chromophore molecule. Phys Chem Chem Phys 2015; 16:13145-55. [PMID: 24866869 DOI: 10.1039/c4cp01543f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New assemblies constituted by a microporous matrix of mordenite (MOR) zeolite on which TiO2 nanoclusters are deposited were synthesized using ionic oxalate complexes and TiCl3 titanium precursors. The samples were used to investigate the transfer of electrons produced by spontaneous or photo-induced ionization of a guest molecule (t-stilbene, t-St) occluded in the porous volume towards the conduction band of a conductive material placed nearby, in the pores or at least close to their entrance. The reaction mechanisms were compared in these Ti-rich solids and in a Ti-free mordenite sample. The characterization by XRD, N2 physisorption, TEM, XPS and DRIFT spectroscopy of the supramolecular TiO2/MOR systems before t-St adsorption showed the preservation of the crystalline structure after Ti addition and thermal activation treatments. They also revealed that titanium is mainly located at the external surface of the zeolite grains, in the form of highly dispersed and/or aggregated anatase. After incorporation of the guest molecule in the new assemblies, diffuse reflectance UV-visible and EPR spectroscopies indicate that the electron transfer processes are similar with and without TiO2 but strongly stabilized t-St˙(+) radicals are detected in the TiO2-MOR samples whereas such species were never detected earlier in TiO2-free mordenite using these techniques. The stabilization process is found to be more efficient in the sample prepared with TiCl3 as the precursor than with titanium oxalates. It is proposed that the proximity of TiO2 with the formed t-St˙(+) radicals provokes the stabilization of the radical through capture of the ejected electron by the semi-conductor and that confinement effects can also play a role.
Collapse
Affiliation(s)
- A Legrand
- LASIR, UMR 8516, Université Lille 1, Bât C8, 59655 Villeneuve d'Ascq cedex, France.
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Wang B, Zhang G, Leng X, Sun Z, Zheng S. Characterization and improved solar light activity of vanadium doped TiO2/diatomite hybrid catalysts. JOURNAL OF HAZARDOUS MATERIALS 2015; 285:212-220. [PMID: 25497036 DOI: 10.1016/j.jhazmat.2014.11.031] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 11/17/2014] [Accepted: 11/21/2014] [Indexed: 06/04/2023]
Abstract
V-doped TiO2/diatomite composite photocatalysts with different vanadium concentrations were synthesized by a modified sol-gel method. The diatomite was responsible for the well dispersion of TiO2 nanoparticles on the matrix and consequently inhibited the agglomeration. V-TiO2/diatomite hybrids showed red shift in TiO2 absorption edge with enhanced absorption intensity. Most importantly, the dopant energy levels were formed in the TiO2 bandgap due to V(4+) ions substituted to Ti(4+) sites. The 0.5% V-TiO2/diatomite photocatalyst displayed narrower bandgap (2.95 eV) compared to undoped sample (3.13 eV) and other doped samples (3.05 eV) with higher doping concentration. The photocatalytic activities of V doped TiO2/diatomite samples for the degradation of Rhodamine B under stimulated solar light illumination were significantly improved compared with the undoped sample. In our case, V(4+) ions incorporated in TiO2 lattice were responsible for increased visible-light absorption and electron transfer to oxygen molecules adsorbed on the surface of TiO2 to produce superoxide radicals ˙O2(-), while V(5+) species presented on the surface of TiO2 particles in the form of V2O5 contributed to e(-)-h(+) separation. In addition, due to the combination of diatomite as support, this hybrid photocatalyst could be separated from solution quickly by natural settlement and exhibited good reusability.
Collapse
Affiliation(s)
- Bin Wang
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China; School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Qld 4072, Australia.
| | - Guangxin Zhang
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China.
| | - Xue Leng
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Qld 4072, Australia.
| | - Zhiming Sun
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China.
| | - Shuilin Zheng
- School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, PR China.
| |
Collapse
|
17
|
Gurushantha K, Anantharaju K, Nagabhushana H, Sharma S, Vidya Y, Shivakumara C, Nagaswarupa H, Prashantha S, Anilkumar M. Facile green fabrication of iron-doped cubic ZrO2 nanoparticles by Phyllanthus acidus: Structural, photocatalytic and photoluminescent properties. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2014.10.025] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
18
|
Garcia JC, Nolan M, Deskins NA. The nature of interfaces and charge trapping sites in photocatalytic mixed-phase TiO2 from first principles modeling. J Chem Phys 2015; 142:024708. [DOI: 10.1063/1.4905122] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Juan C. Garcia
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, USA
| | - Michael Nolan
- Tyndall National Institute, University College Cork, Lee Maltings, Dyke Parade, Cork, Ireland
| | - N. Aaron Deskins
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, USA
| |
Collapse
|
19
|
Hendrix Y, Lazaro A, Yu Q, Brouwers J. Titania-Silica Composites: A Review on the Photocatalytic Activity and Synthesis Methods. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/wjnse.2015.54018] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
20
|
Schneider J, Matsuoka M, Takeuchi M, Zhang J, Horiuchi Y, Anpo M, Bahnemann DW. Understanding TiO2 Photocatalysis: Mechanisms and Materials. Chem Rev 2014; 114:9919-86. [DOI: 10.1021/cr5001892] [Citation(s) in RCA: 3847] [Impact Index Per Article: 384.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jenny Schneider
- Institut
für Technische Chemie, Leibniz Universität Hannover, Callinstrasse
3, D-30167 Hannover, Germany
| | - Masaya Matsuoka
- Faculty
of Engineering, Osaka Prefecture University, 1 Gakuen-cho, Sakai Osaka 599-8531, Japan
| | - Masato Takeuchi
- Faculty
of Engineering, Osaka Prefecture University, 1 Gakuen-cho, Sakai Osaka 599-8531, Japan
| | - Jinlong Zhang
- Key
Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China
| | - Yu Horiuchi
- Faculty
of Engineering, Osaka Prefecture University, 1 Gakuen-cho, Sakai Osaka 599-8531, Japan
| | - Masakazu Anpo
- Faculty
of Engineering, Osaka Prefecture University, 1 Gakuen-cho, Sakai Osaka 599-8531, Japan
| | - Detlef W. Bahnemann
- Institut
für Technische Chemie, Leibniz Universität Hannover, Callinstrasse
3, D-30167 Hannover, Germany
| |
Collapse
|
21
|
Nakatsuka K, Mori K, Okada S, Ikurumi S, Kamegawa T, Yamashita H. Hydrophobic Modification of Pd/SiO2@Single-Site Mesoporous Silicas by Triethoxyfluorosilane: Enhanced Catalytic Activity and Selectivity for One-Pot Oxidation. Chemistry 2014; 20:8348-54. [DOI: 10.1002/chem.201402586] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Indexed: 11/06/2022]
|
22
|
A dopant-mediated recombination mechanism in Fe-doped TiO2 nanoparticles for the photocatalytic decomposition of nitric oxide. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.09.026] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
23
|
Lee HU, Lee SC, Choi S, Son B, Kim H, Lee SM, Kim HJ, Lee J. Influence of visible-light irradiation on physicochemical and photocatalytic properties of nitrogen-doped three-dimensional (3D) titanium dioxide. JOURNAL OF HAZARDOUS MATERIALS 2013; 258-259:10-18. [PMID: 23692678 DOI: 10.1016/j.jhazmat.2013.04.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 04/15/2013] [Accepted: 04/18/2013] [Indexed: 06/02/2023]
Abstract
We report highly active visible-light driven nitrogen-doped three-dimensional polycrystalline anatase TiO2 photocatalysts (N-3D TiO2) for environmental and biomedical applications. N-3D TiO2 is synthesized at a low temperature (<90°C) without thermal treatment via a modified hydrothermal process (HP) and ultrasound irradiation (UI). The N-3D TiO2 is additionally irradiated with visible-light to improve the hydroxylation of its surface. Under visible-light irradiation, the photocatalytic activity of visible-light irradiated N-3D TiO2 (*N-3D TiO2; [k]=1.435 h(-1)) is 26.1 times higher than that of 3D TiO2 ([k]=0.055 h(-1)). The *N-3D TiO2 is highly recyclable and retained 91.8% of the initial decolorization rate after fifteen cycles. Interestingly, the *N-3D TiO2 shows very strong antibacterial properties against both Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) after exposure to visible-light for 3h. The antibacterial properties of *N-3D TiO2 are more effective than those of TiO2, 3D TiO2, and N-3D TiO2. More than 91.3% of the E. coli is sterilized after ten cycles. There are a large increase in the photocatalytic and antibacterial activity of *N-3D TiO2 relative to that of N-3D TiO2 owing to the hydroxylation of the N-3D TiO2 surface as a result of the visible-light irradiation. These results indicate that *N-3D TiO2 might have utility in several promising applications such as highly efficient water/air treatment, inactivation of pathogenic microorganisms, and solar-energy conversion.
Collapse
Affiliation(s)
- Hyun Uk Lee
- Division of Materials Science, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea.
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Photocatalytic reduction of CO2 with H2O on highly dispersed Ti-oxide catalysts as a model of artificial photosynthesis. J CO2 UTIL 2013. [DOI: 10.1016/j.jcou.2013.03.005] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
25
|
Obregón S, Kubacka A, Fernández-García M, Colón G. High-performance Er3+–TiO2 system: Dual up-conversion and electronic role of the lanthanide. J Catal 2013. [DOI: 10.1016/j.jcat.2012.12.021] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
26
|
Removal of NOx by photocatalytic processes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2013. [DOI: 10.1016/j.jphotochemrev.2012.08.002] [Citation(s) in RCA: 252] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
27
|
Joni IM, Ogi T, Iwaki T, Okuyama K. Synthesis of a Colorless Suspension of TiO2 Nanoparticles by Nitrogen Doping and the Bead-Mill Dispersion Process. Ind Eng Chem Res 2012. [DOI: 10.1021/ie302179p] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- I Made Joni
- Department of Physics, Faculty of Mathematics
and Natural Sciences, Padjadjaran University, Jl. Raya Bandung-Sumedang KM 21, Jatinangor 45363, Indonesia
| | - Takashi Ogi
- Department of Chemical Engineering,
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8527, Japan
| | - Toru Iwaki
- Department of Chemical Engineering,
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8527, Japan
| | - Kikuo Okuyama
- Department of Chemical Engineering,
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima, Hiroshima 739-8527, Japan
| |
Collapse
|
28
|
Photocatalytic Reduction of Carbon Dioxide by Water: A Step towards Sustainable Fuels and Chemicals. ACTA ACUST UNITED AC 2012. [DOI: 10.4028/www.scientific.net/msf.734.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photo catalytic reduction of carbon dioxide orartificial photo synthesisto yield hydrogen and hydrocarbons like methane, methanol etc., has emerged as a subject/process of intensive study due to its potential applications towards abatement of atmospheric CO2levels and conversion to fuels and chemicals. This Chapter provides a comprehensive picture of the process that has posed several scientific and technological challenges, like activation of most stable molecules-CO2and water, extremely low conversion rates, complex reaction pathways involving multi electron transfer steps and short catalyst life. All the major aspects/developments on this process like, the salient features and technological aspects, thermodynamic and kinetic characteristics, various types of photo-active catalysts-, like, titania based catalysts and titania with various dopants and modifiers, various metal oxides/sulfides/nitrides/ layered titanates, binary and ternary oxides of Nb, Ta, Ga & In mixed oxide catalysts, metal complexes, and supra molecular catalysts-, sensitization by macro cylic ligands, influence of process parameters, catalyst structure-property-activity correlations, aspects of deactivation of catalysts, reaction mechanistic aspects and sequential surface reaction pathways, recent trends and future directions have been covered. Design and development of efficient catalyst systems and achieving higher yield of desired products (higher selectivity) and extending the catalyst life are the key issues being pursued by the researchers. The process is in nascent stage and further improvements are needed as CO2conversion rates are extremely small, with products formed in terms of 1-10 micro moles/hr. One of the means of improving the process efficiency is to carry out electrochemical reduction of CO2using solar electric power, with an integrated Photo electrochemical cell (PEC). Yet another option is to reduce CO2to methanol with hydrogen produced using solar powered PEC.
Collapse
|
29
|
Han DS, Batchelor B, Park SH, Abdel-Wahab A. As(V) adsorption onto nanoporous titania adsorbents (NTAs): effects of solution composition. JOURNAL OF HAZARDOUS MATERIALS 2012; 229-230:273-281. [PMID: 22727482 DOI: 10.1016/j.jhazmat.2012.05.105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Revised: 05/30/2012] [Accepted: 05/31/2012] [Indexed: 06/01/2023]
Abstract
This study has focused on developing two nanoporous titania adsorbents (NTA) to enhance removal efficiency of adsorption process for As(V) by characterizing the effects of pH and phosphate concentration on their sorption capacities and behaviors. One type of adsorbent is a mesoporous titania (MT) solid phase and the other is group of a highly ordered mesoporous silica solids (SBA-15) that can incorporate different levels of reactive titania sorption sites. Microscopic analysis showed that Ti((25))-SBA-15 (Ti/SBA=0.25 g/g) had titania nanostructured mesopores that do not rupture the highly ordered hexagonal silica framework. However, MT has disordered, wormhole-like mesopores that are caused by interparticle porosity. Adsorption experiments showed that Ti((25))-SBA-15 had a greater sorption capacity for As(V) than did Ti((15))-SBA-15 or Ti((35))-SBA-15 and the amount of As(V) adsorbed generally decreased as pH increased. Higher removal of As(V) was observed with Ti((25))-SBA-15 than with MT at pH 4, but MT had higher removals at higher pH (7, 9.5), even though MT has a lower specific surface area. However, in the presence of phosphate, MT showed higher removal of As(V) at low pH rather than did Ti((25))-SBA-15. As expected, the NTAs showed very fast sorption kinetics, but they followed a bi-phasic sorption pattern.
Collapse
Affiliation(s)
- Dong Suk Han
- Chemical Engineering Program, Texas A&M University at Qatar, Education City, Doha 23874, Qatar. dong
| | | | | | | |
Collapse
|
30
|
Selvam K, Swaminathan M. Nano N-TiO2 mediated selective photocatalytic synthesis of quinaldines from nitrobenzenes. RSC Adv 2012. [DOI: 10.1039/c2ra01178f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
N-Doped TiO2 using a new nitrogen precursor hydrazine hydrate was synthesized by a simple wet method.
Collapse
|
31
|
Shen X, Zhang J, Tian B. Microemulsion-mediated solvothermal synthesis and photocatalytic properties of crystalline titania with controllable phases of anatase and rutile. JOURNAL OF HAZARDOUS MATERIALS 2011; 192:651-657. [PMID: 21684078 DOI: 10.1016/j.jhazmat.2011.05.066] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 04/30/2011] [Accepted: 05/21/2011] [Indexed: 05/30/2023]
Abstract
Titanium oxide with different ratios of anatase to rutile has been prepared by the microemulsion-mediated solvothermal method. The resulting samples were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, UV-vis diffuse reflectance spectra, transmission electron microscopy and Brunauer-Emmett-Teller analysis. The contents of anatase and rutile in the TiO(2) particles have been successfully controlled by simply adjusting the amount of urea in the aqueous phase of the microemulsion. Both the degradation of Rhodamine B in aqueous solutions and mineralization of TOC revealed that the catalyst containing 47.6% anatase have presented the highest photocatalytic activity. A proposed mechanism is discussed to interpret the evolution of the phases based on the effect of different amount of urea.
Collapse
Affiliation(s)
- Xiaojun Shen
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China
| | | | | |
Collapse
|
32
|
Sumitsawan S, Cho J, Sattler ML, Timmons RB. Plasma surface modified TiO2 nanoparticles: improved photocatalytic oxidation of gaseous m-xylene. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:6970-6977. [PMID: 21761865 DOI: 10.1021/es2012963] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Titanium dioxide (TiO(2)) is a preferred catalyst for photocatalytic oxidation of many air pollutants. In an effort to enhance its photocatalytic activity, TiO(2) was modified by pulsed plasma treatment. In this work, TiO(2) nanoparticles, coated on a glass plate, were treated with a plasma discharge of hexafluoropropylene oxide (HFPO) gas. By appropriate adjustment of discharge conditions, it was discovered that the TiO(2) particles can be either directly fluorinated (Ti-F) or coated with thin perfluorocarbon films (C-F). Specifically, under relatively high power input, the plasma deposition process favored direct surface fluorination. The extent of Ti-F formation increased with increasing power input. In contrast, at lower average power inputs, perfluorocarbon films are deposited on the surface of the TiO(2) particles. The plasma surface modified TiO(2) nanoparticles were subsequently employed as catalysts in the photocatalytic oxidation of m-xylene in air, as carried out inside a batch reactor with closed loop constant gas circulation. Both types of modified TiO(2) were significantly more catalytically active than that of the unmodified particles. For example, the rate constant of m-xylene degradation was increased from 0.012 min(-1) with untreated TiO(2) to 0.074 min(-1) with fluorinated TiO(2). Although it is not possible to provide unequivocal reasons for this increased photocatalytic activity, it is noted that the plasma surface treatment converted the TiO(2) from hydrophilic to highly hydrophobic, which would provide more facile catalyst adsorption of the xylene from the flowing air. Also, based on literature reports, the use of fluorinated TiO(2) reduces electron-hole recombination rates, thus increasing the photocatalytic activity.
Collapse
Affiliation(s)
- Sulak Sumitsawan
- Department of Civil Engineering, University of Texas at Arlington, Arlington, Texas 76019, USA
| | | | | | | |
Collapse
|
33
|
Enhanced photocatalytic activity for titanium dioxide by co-modification with copper and iron. TRANSIT METAL CHEM 2010. [DOI: 10.1007/s11243-010-9414-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
34
|
Naik B, Parida KM. Solar Light Active Photodegradation of Phenol over a FexTi1−xO2−yNy Nanophotocatalyst. Ind Eng Chem Res 2010. [DOI: 10.1021/ie100889m] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brundabana Naik
- Colloids and Materials Chemistry Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751 013, Orissa, India
| | - K. M. Parida
- Colloids and Materials Chemistry Department, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar 751 013, Orissa, India
| |
Collapse
|
35
|
Xing M, Wu Y, Zhang J, Chen F. Effect of synergy on the visible light activity of B, N and Fe co-doped TiO2 for the degradation of MO. NANOSCALE 2010; 2:1233-1239. [PMID: 20648355 DOI: 10.1039/c0nr00078g] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Single doped, co-doped and tri-doped TiO(2) with B, N and Fe are successfully synthesized by using the hydrothermal method. The samples are characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples are evaluated for degradation of methyl-orange (MO, 20 mg L(-1)) in aqueous solutions under visible light (lambda > 420 nm). The results of XRD suggest that all the catalysts present anatase crystal. All the doping catalysts show higher photoactivities than pure TiO(2) under visible light irradiation. In the single nonmetal doped TiO(2), the localized dopant levels near the valence band (VB) are responsible for the enhancement of photoactivies. Fe(3+) impurity level formed under the conduction band (CB) induces the high photocatalytic activities of iron doped TiO(2). In the co-doped and tri-doped catalysts, the B 2p and N 2p acceptor states contribute to the band gap narrowing by mixing with O 2p states combined with the overlapping of the conduction band by the iron "d" orbital, resulting in improvement of the photo-performance under visible light irradiation. Iron co-doped with boron catalyst shows low photoactivity under visible light due to the absence of Fe(3+) impurity levels at the bottom of the conduction band. In addition, the XPS results indicate the presence of synergistic effects in co-doped and tri-doped catalysts, which contribute to the enhancement of photocatalytic activities.
Collapse
Affiliation(s)
- Mingyang Xing
- Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China
| | | | | | | |
Collapse
|
36
|
Liu C, Sun H, Yang S. From Nanorods to Atomically Thin Wires of Anatase TiO2: Nonhydrolytic Synthesis and Characterization. Chemistry 2010; 16:4381-93. [DOI: 10.1002/chem.200902524] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
37
|
Modelling and experimental study of the NOx photocatalytic degradation employing concrete pavement with titanium dioxide. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.03.042] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
38
|
He T, Zhou Z, Xu W, Ren F, Ma H, Wang J. Preparation and photocatalysis of TiO2–fluoropolymer electrospun fiber nanocomposites. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.04.015] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
39
|
Tebby Z, Babot O, Michau D, Hirsch L, Carlos L, Toupance T. A simple route towards low-temperature processing of nanoporous thin films using UV-irradiation: Application for dye solar cells. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.03.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
40
|
Dong F, Zhao W, Wu Z, Guo S. Band structure and visible light photocatalytic activity of multi-type nitrogen doped TiO(2) nanoparticles prepared by thermal decomposition. JOURNAL OF HAZARDOUS MATERIALS 2009; 162:763-770. [PMID: 18586393 DOI: 10.1016/j.jhazmat.2008.05.099] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Accepted: 05/21/2008] [Indexed: 05/26/2023]
Abstract
Multi-type nitrogen doped TiO(2) nanoparticles were prepared by thermal decomposition of the mixture of titanium hydroxide and urea at 400 degrees C for 2h. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (UV-vis DRS), and photoluminescence (PL). The results showed that the as-prepared samples exhibited strong visible light absorption due to multi-type nitrogen doped in the form of substitutional (N-Ti-O and Ti-O-N) and interstitial (pi* character NO) states, which were 0.14 and 0.73 eV above the top of the valence band, respectively. A physical model of band structure was established to clarify the visible light photocatalytic process over the as-prepared samples. The photocatalytic activity was evaluated for the photodegradation of gaseous toluene under visible light irradiation. The activity of the sample prepared from wet titanium hydroxide and urea (TiO(2)-Nw, apparent reaction rate constant k = 0.045 min(-1)) was much higher than other samples including P25 (k = 0.0013 min(-1)). The high activity can be attributed to the results of the synergetic effects of strong visible light absorption, good crystallization, large surface hydroxyl groups, and enhanced separation of photoinduced carriers.
Collapse
Affiliation(s)
- Fan Dong
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China
| | | | | | | |
Collapse
|
41
|
Tian B, Li C, Gu F, Jiang H. Synergetic effects of nitrogen doping and Au loading on enhancing the visible-light photocatalytic activity of nano-TiO2. CATAL COMMUN 2009. [DOI: 10.1016/j.catcom.2008.12.029] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
42
|
Chapter 1 Applications of Photoluminescence Spectroscopy to the Investigation of Oxide‐Containing Catalysts in the Working State. ADVANCES IN CATALYSIS 2009. [DOI: 10.1016/s0360-0564(08)00001-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
|
43
|
Dong F, Zhao W, Wu Z. Characterization and photocatalytic activities of C, N and S co-doped TiO(2) with 1D nanostructure prepared by the nano-confinement effect. NANOTECHNOLOGY 2008; 19:365607. [PMID: 21828878 DOI: 10.1088/0957-4484/19/36/365607] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A novel method was developed for preparing high specific surface area (156.2 m(2) g(-1)) one-dimensional TiO(2) nanostructures co-doped with C, N and S by the nano-confinement effect. A nonmetal doping source (thiourea) was first intercalated into the inner space of H-titanate nanotubes prepared by the hydrothermal method, and then calcined at 450 °C for 2 h in air. The as-prepared C, N and S co-doped TiO(2) nanowires exhibited high visible light and enhanced UV-vis activities in photocatalytic degradation of toluene in the gas phase. The samples were characterized by x-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, fast Fourier transform analysis, x-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra and photoluminescence. The results indicated that the anatase nanowires grew along the [101] direction. Doping TiO(2) nanowires with C, N and S could not only broaden the light adsorption spectra into the visible region (400-600 nm), but also inhibit the recombination of photo-induced carriers. A mechanism is proposed to elucidate the nano-confinement effect of H-titanate nanotubes in the formation of C, N and S co-doping. Based on this mechanism, the effect of C, N and S co-doping on the band structure of TiO(2) nanowires is also discussed.
Collapse
Affiliation(s)
- Fan Dong
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
| | | | | |
Collapse
|
44
|
Okamoto A, Nakamura R, Osawa H, Hashimoto K. Site-specific synthesis of oxo-bridged mixed-valence binuclear complexes on mesoporous silica. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:7011-7017. [PMID: 18503283 DOI: 10.1021/la704032c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report the site-specific synthesis of mixed valence TiIV-O-FeII complexes within the pores of ordered mesoporous silica (SBA-15). By using 6-di- tert-butylpyridine as the selective activator of tripodally linked TiIV-OH groups of Ti-grafted SBA-15, the FeCl2.4H2O complexes reacted selectively with the nucleophilic TiIV-O(-) groups. The formation of Si-O-FeII byproducts, due to the reaction with the abundant Si-OH groups, was successfully restricted and the selectivity for forming the TiIV-O-FeII complexes exceeded 80%. The metal-metal interaction of TiIV-O-FeII complexes was confirmed by the appearance of TiIV/FeII --> TiIII/Fe III metal-to-metal charge transfer band, and their coordination, valency, and spin state were characterized by diffuse transmission UV-vis, Fourier transform IR, and Fe K-edge X-ray absorption fine structure measurements. It was also confirmed that the present methods can be extended to other metal combinations of TiIV-O-NiII and TiIV-O-MnII. The electron transfer processes occurring under photoinduced metal-to-metal charge transfer of oxo-bridged mixed valence complexes on silica supports have recently been proven as a new class of visible-light-sensitive redox centers. Thus, the present synthetic procedure allows the fabrication of a variety of photochemical reaction centers according to the molecular-level design.
Collapse
Affiliation(s)
- Akihiro Okamoto
- Department of Applied Chemistry, School of Engineering, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | | | | | | |
Collapse
|
45
|
Li G, Dimitrijevic NM, Chen L, Nichols JM, Rajh T, Gray KA. The Important Role of Tetrahedral Ti4+ Sites in the Phase Transformation and Photocatalytic Activity of TiO2 Nanocomposites. J Am Chem Soc 2008; 130:5402-3. [DOI: 10.1021/ja711118u] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gonghu Li
- Institute for Catalysis in Energy Processes, Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, and Chemical Sciences and Engineering Division, Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Nada M. Dimitrijevic
- Institute for Catalysis in Energy Processes, Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, and Chemical Sciences and Engineering Division, Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Le Chen
- Institute for Catalysis in Energy Processes, Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, and Chemical Sciences and Engineering Division, Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Jamie M. Nichols
- Institute for Catalysis in Energy Processes, Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, and Chemical Sciences and Engineering Division, Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Tijana Rajh
- Institute for Catalysis in Energy Processes, Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, and Chemical Sciences and Engineering Division, Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Kimberly A. Gray
- Institute for Catalysis in Energy Processes, Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, and Chemical Sciences and Engineering Division, Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| |
Collapse
|
46
|
Aprile C, Corma A, Garcia H. Enhancement of the photocatalytic activity of TiO2through spatial structuring and particle size control: from subnanometric to submillimetric length scale. Phys Chem Chem Phys 2008; 10:769-83. [PMID: 18231679 DOI: 10.1039/b712168g] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Carmela Aprile
- Instituto de Tecnología QuímicaCSIC-UPV, Universidad Politécnica de Valencia, Av. De los Naranjos s/n, 46022, Valencia, Spain
| | | | | |
Collapse
|
47
|
Song X, Gao L. Synthesis, characterization, and optical properties of well-defined N-doped, hollow silica/titania hybrid microspheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:11850-6. [PMID: 17914850 DOI: 10.1021/la7019704] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Well-defined nitrogen-doped, hollow SiO2/TiO2 hybrid spheres were successfully prepared through a two-step sol-gel synthesis combined calcination process using triethylamine as the nitrogen source. In this approach, polystyrene (PS)/silica microspheres were first synthesized. Subsequently, the amine-treated PS/SiO2/TiO2 hybrid spheres were obtained by sol-gel method. Finally, the elimination of the PS core, nitrogen-doping process, and crystallization of amorphous TiO2 were simultaneously conducted in the calcination process to acquire the final products. The as-prepared hybrid spheres were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. The results of XRD, FTIR, and XPS spectra indicated that nitrogen was really doped into the anatase TiO2 shell and confirmed that most nitrogen dopants might be present in the chemical environments of N-Ti-O and Ti-N-O. It was found that the absorption shoulder of nitrogen-doped hollow SiO2/TiO2 hybrid spheres vastly shifted to the visible region up to around 530 nm. The photoluminescence (PL) bands showed spectral lines at about 421, 472, and 529 nm, which were attributed to the self-trapped excitons, F and F+ centers. Moreover, the intensity of the PL spectra band of hollow SiO2/TiO2 hybrid spheres increased with as the amount of titanium tetrabutoxide (TBOT) precursor increased. However, the doping of nitrogen into hollow SiO2/TiO2 hybrid spheres led to the drastic quenching of photoluminescence because of the increase in the separation efficiency of the photoinduced electron and hole pairs.
Collapse
Affiliation(s)
- Xuefeng Song
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China
| | | |
Collapse
|
48
|
|
49
|
Hu Y, Martra G, Zhang J, Higashimoto S, Coluccia S, Anpo M. Characterization of the Local Structures of Ti-MCM-41 and Their Photocatalytic Reactivity for the Decomposition of NO into N2 and O2. J Phys Chem B 2006; 110:1680-5. [PMID: 16471733 DOI: 10.1021/jp058240u] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ti-MCM-41 mesoporous molecular sieves were prepared at ambient temperature and were characterized by X-ray absorption near-edge structure and extended X-ray absorption fine structure, UV-vis, Fourier transform infrared spectroscopy, and photoluminescence spectroscopic analyses. It was found that an increase in the Ti content caused the structure of the Ti-oxides in Ti-MCM-41 to change from an isolated tetrahedral coordination to adjacent Ti-oxide species with Ti4+ of tetrahedral coordination. The photocatalytic reactivity of these catalysts for the decomposition of NO into N2 and O2 was found to strongly depend on the local structure of the Ti-oxide species including their coordination and distribution, i.e., the charge transfer excited state of the highly dispersed isolated tetrahedrally coordinated Ti-oxides act as the active sites for the photocatalytic decomposition of NO into N2 and O2.
Collapse
Affiliation(s)
- Yun Hu
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan
| | | | | | | | | | | |
Collapse
|
50
|
Neppolian B, Yamashita H, Okada Y, Nishijima H, Anpo M. Preparation of Unique TiO2 Nano-particle Photocatalysts by a Multi-gelation Method for Control of the Physicochemical Parameters and Reactivity. Catal Letters 2005. [DOI: 10.1007/s10562-005-8013-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|