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Victoria Dimas B, Hernández Pérez I, Febles VG, Arceo LDB, Parra RS, Rivera Olvera JN, Luna Paz R, Máximo DVM, Reyes LG. Atomic-Scale Investigation on the Evolution of Tio 2-Anatase Prepared by a Sonochemical Route and Treated with NaOH. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E685. [PMID: 32033021 PMCID: PMC7040896 DOI: 10.3390/ma13030685] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 01/30/2020] [Accepted: 01/31/2020] [Indexed: 12/02/2022]
Abstract
To date, the formation mechanisms of TiO2, as well as its heterostructures, have not been clarified. Moreover, detailed research on the transition from a tetragonal anatase phase to the monoclinic phase of the TiO2(B) phase and their interface structure has been quite limited until now. In the present study, we report on the sonochemical synthesis of TiO2-anatase with a crystallite size of 5.2 ± 1.5 nm under different NaOH concentrations via the hydrothermal method. The use of alkaline solution and the effect of the temperature and reaction time on the formation and structural properties of TiO2-anatase nanopowders were studied. The effects of NaOH concentration on the formation and transformation of titanate structures are subject to thermal effects that stem from the redistribution of energy in the system. These mechanisms could be attributed to three phenomena: (1) the self-assembly of nanofibers and nanosheets, (2) the Ostwald ripening process, and (3) the self-development of hollow TiO2 mesostructures.
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Affiliation(s)
- Berenice Victoria Dimas
- Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-A, Av. Sn. Pablo No. 180, México D.F. 02200, Mexico; (B.V.D.); (R.L.P.)
| | - Isaías Hernández Pérez
- Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-A, Av. Sn. Pablo No. 180, México D.F. 02200, Mexico; (B.V.D.); (R.L.P.)
| | - Vicente Garibay Febles
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152 Col. San Bartolo Atepehuacan, México D.F. C.P 07730, Mexico;
| | - Lucía Díaz Barriga Arceo
- Departamento de Ingeniería Metalúrgica y Materiales, Instituto Politécnico Nacional, ESIQIE-UPALM, México D.F. 07738, Mexico;
| | - Raúl Suárez Parra
- Instituto de Energías Renovables, IER-UNAM. Priv. Xochicalco S/N, Temixco, Morelos 62580, Mexico;
| | - Jesús Noé Rivera Olvera
- Tecnológico Nacional de México/ TES Ixtapaluca. TESI, Km. 7 de la carretera Ixtapaluca-Coatepec s/n, Ixtapaluca, Estado de México C.P.56580, Mexico;
| | - Ricardo Luna Paz
- Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-A, Av. Sn. Pablo No. 180, México D.F. 02200, Mexico; (B.V.D.); (R.L.P.)
| | - Dulce Viridiana Melo Máximo
- Tecnológico de Monterrey, Escuela de Ingeniería y Ciencias, Carretera Lago de Guadalupe km 3.5, Atizapán de Zaragoza C.P. 52926, Mexico;
| | - Leonardo González Reyes
- Departamento de Ciencias Básicas, Universidad Autónoma Metropolitana-A, Av. Sn. Pablo No. 180, México D.F. 02200, Mexico; (B.V.D.); (R.L.P.)
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Horlyck J, Nashira A, Lovell E, Daiyan R, Bedford N, Wei Y, Amal R, Scott J. Plasma Treating Mixed Metal Oxides to Improve Oxidative Performance via Defect Generation. MATERIALS 2019; 12:ma12172756. [PMID: 31462008 PMCID: PMC6747793 DOI: 10.3390/ma12172756] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 08/23/2019] [Accepted: 08/26/2019] [Indexed: 12/02/2022]
Abstract
The generation of structural defects in metal oxide catalysts offers a potential pathway to improve performance. Herein, we investigated the effect of thermal hydrogenation and low-temperature plasma treatments on mixed SiO2/TiO2 materials. Hydrogenation at 500 °C resulted in the reduction of the material to produce Ti3+ in the bulk TiO2. In contrast, low temperature plasma treatment for 10 or 20 min generated surface Ti3+ species via the removal of oxygen on both the neat and hydrogenated material. Assessing the photocatalytic activity of the materials demonstrated a 40–130% increase in the rate of formic acid oxidation after plasma treatment. A strong relationship between the Ti3+ content and catalyst activity was established, although a change in the Si–Ti interaction after plasma treating of the neat SiO2/TiO2 material was found to limit performance, and suggests that performance is not determined solely by the presence of Ti3+.
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Affiliation(s)
- Jonathan Horlyck
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Alimatun Nashira
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Emma Lovell
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Rahman Daiyan
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Nicholas Bedford
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Yuexing Wei
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Rose Amal
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Jason Scott
- School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
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Voepel P, Weiss M, Smarsly BM, Marschall R. Photocatalytic activity of multiphase TiO2(B)/anatase nanoparticle heterojunctions prepared from ionic liquids. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.03.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zeghioud H, Assadi AA, Khellaf N, Djelal H, Amrane A, Rtimi S. Reactive species monitoring and their contribution for removal of textile effluent with photocatalysis under UV and visible lights: Dynamics and mechanism. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.07.031] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Xing H, Wen W, Wu JM. Sheet-on-belt branched TiO 2(B)/rGO powders with enhanced photocatalytic activity. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2018; 9:1550-1557. [PMID: 29977688 PMCID: PMC6009680 DOI: 10.3762/bjnano.9.146] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 04/19/2018] [Indexed: 06/08/2023]
Abstract
TiO2(B) is usually adopted to construct phase junctions with anatase TiO2 for applications in photocatalysis to facilitate charge separation; its intrinsic photocatalytic activity, especially when in the form of one- or three-dimensional nanostructures, has been rarely reported. In this study, a sheet-on-belt branched TiO2(B) powder was synthesized with the simultaneous incorporation of reduced graphene oxide (rGO). The monophase, hierarchically nanostructured TiO2(B) exhibited a reaction rate constant 1.7 times that of TiO2(B)/rGO and 2.9 times that of pristine TiO2(B) nanobelts when utilized to assist the photodegradation of phenol in water under UV light illumination. The enhanced photocatalytic activity can be attributed to the significantly increased surface area and enhanced charge separation.
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Affiliation(s)
- Huan Xing
- State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
| | - Wei Wen
- State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
- College of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, P. R. China
| | - Jin-Ming Wu
- State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
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Li F, Li Z, Zhang M, Shen Y, Cai Y, Li Y, He X, Chen C. Ag3PO4@holmium phosphate core@shell composites with enhanced photocatalytic activity. RSC Adv 2017. [DOI: 10.1039/c7ra01444a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study, Ag3PO4@holmium phosphate (HP) composite photocatalysts were firstly prepared. The core–shell heterojunction structure of Ag3PO4@HP significantly improved the photocatalytic activity of Ag3PO4.
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Affiliation(s)
- Fengfeng Li
- Key Lab for Advanced Ceramics and Machining Technology of Ministry of Education
- School of Materials Science and Engineering of Tianjin University
- Tianjin
- China
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
| | - Zhihong Li
- Key Lab for Advanced Ceramics and Machining Technology of Ministry of Education
- School of Materials Science and Engineering of Tianjin University
- Tianjin
- China
| | - Mingxi Zhang
- Light Alloy Research Institute
- Central South University
- Changsha
- China
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
| | - Yi Shen
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
- Key Laboratory of Environment Functional Materials of Tangshan City
- North China University of Science and Technology
- Tangshan
- China
| | - Yongfeng Cai
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
- Key Laboratory of Environment Functional Materials of Tangshan City
- North China University of Science and Technology
- Tangshan
- China
| | - Yaran Li
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
- Key Laboratory of Environment Functional Materials of Tangshan City
- North China University of Science and Technology
- Tangshan
- China
| | - Xinyu He
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
- Key Laboratory of Environment Functional Materials of Tangshan City
- North China University of Science and Technology
- Tangshan
- China
| | - Chen Chen
- Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province
- Key Laboratory of Environment Functional Materials of Tangshan City
- North China University of Science and Technology
- Tangshan
- China
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