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El-Sawaf AK, Nassar AA, Tolan DA, Ismael M, Alhindawy I, M El-Desouky E, El-Nahas A, Shahien M, Maize M. A mesoporous Mo and N Co-doped TiO 2 nanocomposite with enhanced photocatalytic efficiency. RSC Adv 2024; 14:3536-3547. [PMID: 38259997 PMCID: PMC10801452 DOI: 10.1039/d3ra07258d] [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: 10/24/2023] [Accepted: 01/04/2024] [Indexed: 01/24/2024] Open
Abstract
This study reports the synthesis of a mesoporous Mo and N codoped anatase TiO2 nanocomposite with many oxygen vacancies using a simple one-step hydrothermal method and subsequent calcination treatment. Both Mo and N were effectively co-incorporated into the anatase phase of TiO2 without MoOx phase segregation. The codoped catalyst demonstrated a mesoporous architecture with a surface area of 107.48 m2 g-1 and a pore volume of 0.2974 cm3 g-1. X-ray photoelectron spectroscopy confirmed that both Mo and N dissolved in the TiO2 lattice and created induced oxygen vacancies. The interaction of the dopants (Mo and N) and oxygen vacancies clearly affected TiO2 crystal formation. Photocatalytic performance of the nanocomposite was investigated in terms of the decomposition of methyl orange at a concentration of 50 mg L-1 in an aqueous solution. The results revealed a significant methyl orange degradation of up to 99.6% after 30 min irradiation under a UV light. The impressive performance of the nanocomposite is assigned to the synergetic effect of important factors, including the co-doping of metallic (Mo) and non-metallic (N) elements, oxygen vacancy defects, bandgap, crystallite size, mesoporous structure, and BET surface area.
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Affiliation(s)
- Ayman K El-Sawaf
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | - Amal A Nassar
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
| | - Dina A Tolan
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | | | | | | | - Ahmed El-Nahas
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
| | - Mohammed Shahien
- Central Metallurgical Research & Development Institute (CMRDI) Helwan 11421 Egypt
| | - Mai Maize
- Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
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2
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Elbashir AA, Shinger MI, Ma X, Lu X, Ahmed AY, Alnajjar AO. Fabrication of a Novel CNT-COO -/Ag 3PO 4@AgIO 4Composite with Enhanced Photocatalytic Activity under Natural Sunlight. Molecules 2023; 28:molecules28041586. [PMID: 36838576 PMCID: PMC9967086 DOI: 10.3390/molecules28041586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 01/28/2023] [Accepted: 02/01/2023] [Indexed: 02/11/2023] Open
Abstract
In this study, a carboxylated carbon nanotube-grafted Ag3PO4@AgIO4 (CNT-COO-/Ag3PO4@AgIO4) composite was synthesized through an in situ electrostatic deposition method. The synthesized composite was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), and energy-dispersive X-ray spectroscopy (EDS). The electron transfer ability of the synthesized composite was studied using electrochemical impedance spectroscopy (EIS). The CNT-COO-/Ag3PO4@AgIO4 composite exhibited higher activity than CNT/Ag3PO4@AgIO4, Ag3PO4@AgIO4, and bare Ag3PO4. The material characterization and the detailed study of the various parameters thataffect the photocatalytic reaction revealed that the enhanced catalytic activity is related to the good interfacial interaction between CNT-COO and Ag3PO4. The energy band structure analysis is further considered as a reason for multi-electron reaction enhancement. The results and discussion in this study provide important information for the use of the functionalized CNT-COOH in the field of photocatalysis. Moreover, providinga new way to functionalize CNT viadifferent functional groups may lead to further development in the field of photocatalysis. This work could provide a new way to use natural sunlight to facilitate the practical application of photocatalysts toenvironmental issues.
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Affiliation(s)
- Abdalla A. Elbashir
- Department of Chemistry, College of Science, King Faisal University, Al-Hofuf 31982, Saudi Arabia
- Department of Chemistry, Faculty of Science, Khartoum University, P.O. Box 321, Khartoum 11111, Sudan
- Correspondence: (A.A.E.); (A.Y.A.); Tel.: +966-567254917 (A.A.E.); +966-543478704 (A.Y.A.)
| | - Mahgoub Ibrahim Shinger
- Department of Applied and Industrial Chemistry, Faculty of Pure and Applied Sciences, International University of Africa, Khartoum 11111, Sudan
| | - Xoafang Ma
- Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Xiaoquan Lu
- Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Amel Y. Ahmed
- Department of Chemistry, College of Science, King Faisal University, Al-Hofuf 31982, Saudi Arabia
- Chemistry and Nuclear Physics Institute, Sudan Atomic Energy Commission, P.O. Box 3001, Khartoum 11111, Sudan
- Correspondence: (A.A.E.); (A.Y.A.); Tel.: +966-567254917 (A.A.E.); +966-543478704 (A.Y.A.)
| | - Ahmed O. Alnajjar
- Department of Chemistry, College of Science, King Faisal University, Al-Hofuf 31982, Saudi Arabia
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Ultarakova A, Karshyga Z, Lokhova N, Yessengaziyev A, Kassymzhanov K, Mukangaliyeva A. Studies on the Processing of Fine Dusts from the Electric Smelting of Ilmenite Concentrates to Obtain Titanium Dioxide. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8314. [PMID: 36499809 PMCID: PMC9738828 DOI: 10.3390/ma15238314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/17/2022] [Accepted: 11/20/2022] [Indexed: 06/17/2023]
Abstract
This article presents studies on the ammonium fluoride processing of dusts from the reduction smelting of ilmenite concentrate with separation of silicon to obtain titanium dioxide. Optimal conditions for pyrohydrolysis of titanium fluorides were determined. The effects of temperature and duration on the process were studied. The optimal conditions for pyrohydrolysis of titanium fluorides were a temperature of 600 °C and duration of 240-300 min. The degree of titanium fluoride conversion to titanium oxide was 99.5% at these conditions. Titanium dioxide obtained by pyrohydrolysis of titanium fluorides was purified from iron, chromium, and manganese impurities. The effect of hydrochloric acid solution concentration, S:L ratio, and the process duration on the purification degree of titanium fluoride pyrohydrolysis was studied. The following optimum purification conditions were determined: hydrochloric acid solution concentration 12.5-15 wt%, temperature 25-30 °C, S:L = 1:6÷8, duration 20-30 min. The purified titanium dioxide consisted mainly of anatase. The pigmented titanium dioxide of rutile modification with 99.8 wt% TiO2 was obtained after calcination at 900 °C for 120 min.
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Affiliation(s)
| | - Zaure Karshyga
- The Institute of Metallurgy and Ore Beneficiation, Satbayev University, Almaty 050013, Kazakhstan
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Isa N, Mohamad Nor N, Wan Kamis WZ, Tan WK, Kawamura G, Matsuda A, Lockman Z. Anodized TiO2 nanotubes using Ti wire in fluorinated ethylene glycol with air bubbles for removal of methylene blue dye. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-021-01644-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Huang J, Li T, Su X, Tian L. Synthesis and characterization of TiO 2 nanonails array via an anodic oxidation method. INORG NANO-MET CHEM 2021. [DOI: 10.1080/24701556.2021.1993917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Jian Huang
- Centre for Innovation and Entrepreneurship, Changchun Normal University, Changchun, China
| | - Tianyu Li
- Department of Chemistry and Chemical Engineering, Changchun University of Science and Technology, Changchun, China
| | - Xiaofa Su
- Department of Chemistry and Chemical Engineering, Changchun University of Science and Technology, Changchun, China
| | - Lecheng Tian
- Department of Chemistry and Chemical Engineering, Changchun University of Science and Technology, Changchun, China
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Abstract
TiO2 has extensive applications in the fields of renewable energy and environmental protections such as being used as photocatalysts or electron transport layers in solar cells. To achieve highly efficient photocatalytic and photovoltaic applications, ongoing efforts are being devoted to developing novel TiO2-based material structures or compositions, in which a first-principles computational approach is playing an increasing role. In this review article, we discuss recent computational and theoretical studies of structural, energetic, electronic, and optical properties of TiO2-based nanocluster, bulk, and material interface for photocatalytic and photovoltaic applications. We conclude the review with a discussion of future research directions in the field.
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Guo Z, Zhang H, Ma X, Zhou X, Liang D, Mao J, Yu J, Wang G, Huang T. Photoelectrochemical Catalysis of Fluorine‐Doped Amorphous TiO
2
Nanotube Array for Water Splitting. ChemistrySelect 2020. [DOI: 10.1002/slct.202002516] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhongqin Guo
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsSchool of Chemistry and Chemical EngineeringUniversity of Jinan Jinan Shandong 250022 China
| | - Haizhou Zhang
- Department of Cardiac SurgeryShandong Provincial Hospital Affiliated to Shandong First Medical University No.324 Jingwu Road Jinan Shandong 250021 China
| | - Xiaochun Ma
- Department of Cardiac SurgeryShandong Provincial Hospital Affiliated to Shandong First Medical University No.324 Jingwu Road Jinan Shandong 250021 China
| | - Xiaoming Zhou
- Department of Cardiac SurgeryShandong Provincial Hospital Affiliated to Shandong First Medical University No.324 Jingwu Road Jinan Shandong 250021 China
| | - Dong Liang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsSchool of Chemistry and Chemical EngineeringUniversity of Jinan Jinan Shandong 250022 China
| | - Jianfeng Mao
- Institute for Superconducting & Electronic MaterialsUniversity of Wollongong NSW 2500 Australia
| | - Jiemei Yu
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsSchool of Chemistry and Chemical EngineeringUniversity of Jinan Jinan Shandong 250022 China
| | - Gang Wang
- Research and Development Center for Graphene/Polymer CompositesShandongLutai Holding Group Co.Ltd. Jining Shandong 272000 China
| | - Taizhong Huang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsSchool of Chemistry and Chemical EngineeringUniversity of Jinan Jinan Shandong 250022 China
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Milosevic I, Jayaprakash A, Greenwood B, van Driel B, Rtimi S, Bowen P. Synergistic Effect of Fluorinated and N Doped TiO₂ Nanoparticles Leading to Different Microstructure and Enhanced Photocatalytic Bacterial Inactivation. NANOMATERIALS 2017; 7:nano7110391. [PMID: 29140308 PMCID: PMC5707608 DOI: 10.3390/nano7110391] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 11/09/2017] [Accepted: 11/10/2017] [Indexed: 11/10/2022]
Abstract
This work focuses on the development of a facile and scalable wet milling method followed by heat treatment to prepare fluorinated and/or N-doped TiO2 nanopowders with improved photocatalytic properties under visible light. The structural and electronic properties of doped particles were investigated by various techniques. The successful doping of TiO2 was confirmed by X-ray photoelectron spectroscopy (XPS), and the atoms appeared to be mainly located in interstitial positions for N whereas the fluorination is located at the TiO2 surface. The formation of intragap states was found to be responsible for the band gap narrowing leading to the faster bacterial inactivation dynamics observed for the fluorinated and N doped TiO2 particles compared to N-doped TiO2. This was attributed to a synergistic effect. The results presented in this study confirmed the suitability of the preparation approach for the large-scale production of cost-efficient doped TiO2 for effective bacterial inactivation.
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Affiliation(s)
- Irena Milosevic
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Amarnath Jayaprakash
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Brigitte Greenwood
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Birgit van Driel
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
| | - Sami Rtimi
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
- Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
| | - Paul Bowen
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-IMX-LTP, Station 12, CH-1015 Lausanne, Switzerland.
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9
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Nano-structural variation of highly aligned anodic Titania nanotube arrays for gas phase photocatalytic application. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.11.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Wang Q, Zhu N, Liu E, Fu L, Zhou T, Cong Y. Highly enhanced photoelectrocatalytic properties by α-Fe 2 O 3 modified NF-TiO 2 pyramids with dominant (101) facets. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.09.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Arabzadeh A, Salimi A. One dimensional CdS nanowire@TiO2 nanoparticles core-shell as high performance photocatalyst for fast degradation of dye pollutants under visible and sunlight irradiation. J Colloid Interface Sci 2016; 479:43-54. [DOI: 10.1016/j.jcis.2016.06.036] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 06/11/2016] [Accepted: 06/13/2016] [Indexed: 11/16/2022]
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12
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Guo F, Shi W, Cai Y, Shao S, Zhang T, Guan W, Huang H, Liu Y. Sheet-on-sphere structured Ag/AgBr@InVO4 heterojunctions and enhanced visible-light photocatalytic activity. RSC Adv 2016. [DOI: 10.1039/c6ra20657c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Sheet-on-sphere Ag/AgBr@InVO4 displayed excellent photocatalytic degradation of RhB, which was attributed to enhanced visible-light absorption and anti-combination of electrons/holes through it's heterostructure.
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Affiliation(s)
- Feng Guo
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Ministry of Education
- School of Environmental Science and Engineering
- Chang'an University
- Xi'an 710064
| | - Weilong Shi
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices
- Institute of Functional Nano & Soft Materials (FUNSOM)
- Soochow University
- Suzhou
- PR China
| | - Yi Cai
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Ministry of Education
- School of Environmental Science and Engineering
- Chang'an University
- Xi'an 710064
| | - Shuwen Shao
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Ministry of Education
- School of Environmental Science and Engineering
- Chang'an University
- Xi'an 710064
| | - Tao Zhang
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Ministry of Education
- School of Environmental Science and Engineering
- Chang'an University
- Xi'an 710064
| | - Weisheng Guan
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Ministry of Education
- School of Environmental Science and Engineering
- Chang'an University
- Xi'an 710064
| | - Hui Huang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices
- Institute of Functional Nano & Soft Materials (FUNSOM)
- Soochow University
- Suzhou
- PR China
| | - Yang Liu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices
- Institute of Functional Nano & Soft Materials (FUNSOM)
- Soochow University
- Suzhou
- PR China
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Li FT, Ran J, Jaroniec M, Qiao SZ. Solution combustion synthesis of metal oxide nanomaterials for energy storage and conversion. NANOSCALE 2015; 7:17590-610. [PMID: 26457657 DOI: 10.1039/c5nr05299h] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The design and synthesis of metal oxide nanomaterials is one of the key steps for achieving highly efficient energy conversion and storage on an industrial scale. Solution combustion synthesis (SCS) is a time- and energy-saving method as compared with other routes, especially for the preparation of complex oxides which can be easily adapted for scale-up applications. This review summarizes the synthesis of various metal oxide nanomaterials and their applications for energy conversion and storage, including lithium-ion batteries, supercapacitors, hydrogen and methane production, fuel cells and solar cells. In particular, some novel concepts such as reverse support combustion, self-combustion of ionic liquids, and creation of oxygen vacancies are presented. SCS has some unique advantages such as its capability for in situ doping of oxides and construction of heterojunctions. The well-developed porosity and large specific surface area caused by gas evolution during the combustion process endow the resulting materials with exceptional properties. The relationship between the structural properties of the metal oxides studied and their performance is discussed. Finally, the conclusions and perspectives are briefly presented.
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Affiliation(s)
- Fa-tang Li
- College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China and School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Jingrun Ran
- School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Mietek Jaroniec
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44240, USA
| | - Shi Zhang Qiao
- School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia.
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14
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Chisaka M, Ando Y, Muramoto H. Facile Combustion Synthesis of Carbon-Supported Titanium Oxynitride to Catalyse Oxygen Reduction Reaction in Acidic Media. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.03.211] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Zhu X, Wei W, Wan Y. Mesoporous Biphasic C and N Codoped Anatase Nanocrystal-Carbon Composites and their Derived Doped Anatase Nanoparticles in Phenol Elimination under Visible Light. ChemCatChem 2015. [DOI: 10.1002/cctc.201500341] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Guo F, Shi W, Lin X, Yan X, Guo Y, Che G. Novel BiVO4/InVO4 heterojunctions: Facile synthesis and efficient visible-light photocatalytic performance for the degradation of rhodamine B. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2014.11.026] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Synthesis and photoelectrochemical studies of N, Zr co-doped mesoporous titanium dioxide. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2014.11.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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18
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Shin SH, Chun HH, Jo WK. Enhanced Photocatalytic Efficiency of N-F-Co-Embedded Titania under Visible Light Exposure for Removal of Indoor-Level Pollutants. MATERIALS 2014; 8:31-41. [PMID: 28787922 PMCID: PMC5455237 DOI: 10.3390/ma8010031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Accepted: 12/01/2014] [Indexed: 10/26/2022]
Abstract
N-F-co-embedded titania (N-F-TiO₂) photocatalysts with varying N:F ratios were synthesized and tested for their ability to photocatalyze the degradation of pollutants present at indoor air levels using visible light. The synthesis was achieved using a solvothermal process with tetrabutyl titanate, urea and ammonium fluoride as sources of Ti, N and F, respectively. Three selected volatile organic compounds (toluene, ethyl benzene and o-xylene) were selected as the test pollutants. The prepared composites were characterized using X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and Ultra-violet (UV)-visible spectroscopy. The photocatalytic degradation efficiencies of N-F-TiO₂ composites were higher than those obtained using pure TiO₂ and N-TiO₂. Moreover, these efficiencies increased as the N:F ratio decreased from sixteen to eight, then decreased as it dropped further to three, indicating the presence of an optimal N:F ratio. Meanwhile, as retention time decreased from 12.4 to 0.62 s, the average photocatalytic efficiencies decreased from 65.4% to 21.7%, 91.5% to 37.8% and 95.8% to 44.7% for toluene, ethyl benzene and o-xylene, respectively. In contrast, the photocatalytic reaction rates increased as retention time decreased. In consideration of all of these factors, under optimized operational conditions, the prepared N-F-TiO₂ composites could be utilized for the degradation of target pollutants at indoor air levels using visible light.
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Affiliation(s)
- Seung-Ho Shin
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea.
| | - Ho-Hwan Chun
- Department of Naval Architecture and Ocean Engineering, Pusan National University, 63 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea.
| | - Wan-Kuen Jo
- Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Korea.
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Spadavecchia F, Ceotto M, Presti LL, Aieta C, Biraghi I, Meroni D, Ardizzone S, Cappelletti G. Second Generation Nitrogen Doped Titania Nanoparticles: A Comprehensive Electronic and Microstructural Picture. CHINESE J CHEM 2014. [DOI: 10.1002/cjoc.201400502] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Sang Y, Liu H, Umar A. Photocatalysis from UV/Vis to Near-Infrared Light: Towards Full Solar-Light Spectrum Activity. ChemCatChem 2014. [DOI: 10.1002/cctc.201402812] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Catalysis plays a key role in chemical production, energy processing, air purification, water treatment, food processing, and the life sciences. Nanostructured materials with high surface areas and some unique properties have received widespread interest in electrocatalysis and photocatalysis. Recently, the author’s research team has designed and studied a variety of novel functional nanomaterials. This review article is derived from the author’s 2013 Canadian Catalysis Lectureship Award Lecture and focuses primarily on the electrocatalytic activities of platinum- and palladium-based nanomaterials and the development of TiO2-based nanostructured photocatalysts. Palladium possesses several exceptional properties that may enable promising applications in hydrogen detection, purification, and storage. The significant roles of palladium-based nanomaterials in facilitating the growth of a hydrogen economy are addressed. As platinum-based catalysts are vital to the development of fuel cells and sensors, the design of high-performance platinum-based electrocatalysts is highlighted. Additionally, TiO2 is considered to be one of the most promising photocatalysts due to its nontoxicity, high stability, and cost effectiveness. The modification of TiO2 nanomaterials to achieve visible light response is discussed as well. It is anticipated that the development of advanced functional nanostructured catalysts will further improve the efficiency and reduce the cost of electrochemical and photochemical processes, making them more attractive in addressing the pressing global energy and environmental issues.
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Affiliation(s)
- Aicheng Chen
- Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada
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22
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Jiang G, Li X, Wei Z, Wang X, Jiang T, Du X, Chen W. Immobilization of N, S-codoped BiOBr on glass fibers for photocatalytic degradation of rhodamine B. POWDER TECHNOL 2014. [DOI: 10.1016/j.powtec.2014.04.042] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Xu M, Han L, Dong S. Facile fabrication of highly efficient g-C3N4/Ag2O heterostructured photocatalysts with enhanced visible-light photocatalytic activity. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12533-40. [PMID: 24206347 DOI: 10.1021/am4038307] [Citation(s) in RCA: 274] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Highly efficient visible-light-driven g-C3N4/Ag2O heterostructured photocatalysts were prepared by a simple liquid phase synthesis method at room temperature. The composition, structure, morphology, and optical absorption properties of the as-prepared g-C3N4/Ag2O composites were characterized by XRD, FTIR, XPS, TEM, and UV-vis DRS, respectively. We found interestingly that the photogenerated charge carriers separations of the as-prepared g-C3N4/Ag2O composites were closely related to the mass ratio of g-C3N4 and Ag2O. When the mass ratio of g-C3N4 and Ag2O reached 1:4, the as-prepared composite exhibited the highest photocatalytic activity, which was almost 11 and 1.2 times as high as that of individual g-C3N4 and Ag2O, respectively. The enhancement of photocatalytic activity could be attributed to the synergetic effects between g-C3N4 and Ag2O as well as the improved dispersibility and the decreased particle size of Ag2O. Moreover, the as-prepared composites showed excellent stability toward the photodegradation of methyl orange (MO). Finally, a possible photocatalytic and charge separation mechanism was proposed.
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Affiliation(s)
- Miao Xu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science , Changchun, Jilin 130022, P. R. China
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Kumar N, Maitra U, Hegde VI, Waghmare UV, Sundaresan A, Rao CNR. Synthesis, Characterization, Photocatalysis, and Varied Properties of TiO2 Cosubstituted with Nitrogen and Fluorine. Inorg Chem 2013; 52:10512-9. [DOI: 10.1021/ic401426q] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nitesh Kumar
- Chemistry
and Physics of
Materials Unit, New Chemistry Unit, Theoretical Sciences Unit, and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064, India
| | - Urmimala Maitra
- Chemistry
and Physics of
Materials Unit, New Chemistry Unit, Theoretical Sciences Unit, and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064, India
| | - Vinay I. Hegde
- Chemistry
and Physics of
Materials Unit, New Chemistry Unit, Theoretical Sciences Unit, and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064, India
| | - Umesh V. Waghmare
- Chemistry
and Physics of
Materials Unit, New Chemistry Unit, Theoretical Sciences Unit, and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064, India
| | - A. Sundaresan
- Chemistry
and Physics of
Materials Unit, New Chemistry Unit, Theoretical Sciences Unit, and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064, India
| | - C. N. R. Rao
- Chemistry
and Physics of
Materials Unit, New Chemistry Unit, Theoretical Sciences Unit, and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064, India
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Fluorinated semiconductor photocatalysts: tunable synthesis and unique properties. Adv Colloid Interface Sci 2012; 173:35-53. [PMID: 22425280 DOI: 10.1016/j.cis.2012.02.004] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 02/19/2012] [Accepted: 02/21/2012] [Indexed: 11/23/2022]
Abstract
Semiconductor photocatalysts are of great significance in solar energy conversion and environmental remediation. To overcome serious drawbacks of these materials with respect to narrow light-response range and low quantum efficiency, a variety of strategies have been developed in the past decades to enhance the light harvesting and excitation as well as the charge transfer against recombination. In particular, fluorination of semiconductor photocatalysts can be employed to modify their surface and bulk properties, and consequently, to enhance their photocatalytic performance. This review presents a comprehensive description of the F-mediated synthesis and unique properties of fluorinated semiconductor photocatalysts, in particular titanium dioxide (TiO(2)). The available strategies for the synthesis of fluorinated photocatalysts include post-synthesis fluorination and in-situ fluorination. Depending on the synthesis route and conditions, it is possible to control the chemical nature of incorporated fluorine (such as adsorbed fluoride and lattice-doped fluorine) and the fluoride-mediated crystal modification and organization, which often results in exceptional surface and bulk physicochemical properties, giving rise to unique photocatalytic properties. Significantly, the surface fluorination induces unusual adsorption behavior and interfacial charge transfer dynamics, directly affecting photocatalytic redox properties of the surface-fluorinated photocatalysts. The lattice fluorine-doping, sole or cooperative with other complementary co-dopants, introduces special localized electronic structures and surface defect states, accounting for the exceptional visible-light photoactivity of the fluorine-doped photocatalysts. Finally, recent advances in the synthesis and properties of fluorinated photocatalysts are summarized along with perspectives on further developments in this area of research.
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Hu D, Chen M, Gao Y, Li F, Wu L. A facile method to synthesize superparamagnetic and up-conversion luminescent NaYF4:Yb, Er/Tm@SiO2@Fe3O4 nanocomposite particles and their bioapplication. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11172h] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Grandcolas M, Ye J. Preparation of fine, uniform nitrogen- and sulfur-modified TiO 2 nanoparticles from titania nanotubes. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2010; 11:055001. [PMID: 27877366 PMCID: PMC5090625 DOI: 10.1088/1468-6996/11/5/055001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 11/17/2010] [Accepted: 09/17/2010] [Indexed: 06/06/2023]
Abstract
TiO2 nanoparticles modified with nitrogen and sulfur were prepared from titania nanotubes by a facile wet chemistry method. The samples synthesized with different thiourea/TiO2 ratios showed a uniform nanoparticle size distribution centred at approximately 10 nm with a developed specific surface area of 246 m2 g-1. These modified nanosized photocatalysts exhibited higher photocatalytic activity for the degradation of gaseous isopropanol than unmodified titania nanotubes under visible illumination. This could be attributed to the synergistic effects of a large specific surface area, strong absorption in the visible region, a redshift in the adsorption edge, and surface adsorption modification induced by nitrogen and sulfur compounds.
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Affiliation(s)
- Mathieu Grandcolas
- International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Jinhua Ye
- Photocatalytic Materials Center, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
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