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Singh P, Ullah Mirza A, Ahmad Bhat S, Kareem A, Nishat N. Synthesis, Characterization and Evaluation of Thermal, Adsorption and Antioxidant Studies of Amino Functionalized Poly(methyl methacrylate)/Titanium dioxide Nanocomposites. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108817] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yang F, Yang R, Yan L, Wu J, Liu X, Yang L, Zhong M, Luo X, Zhang L. Enhancement of Titania Photoanode Performance by Sandwiching Copper between Two Titania Layers. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4326. [PMID: 32998460 PMCID: PMC7579609 DOI: 10.3390/ma13194326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/08/2020] [Accepted: 09/10/2020] [Indexed: 11/17/2022]
Abstract
Vacancies in semiconductors can play a versatile role in boosting their photocatalytic activity. In this work, a novel TiO2/Cu/TiO2 sandwich structure is designed and constructed. Abundant vacancies were introduced in TiO2 lattice by Cu reduction under heat treatment. Meanwhile, Cu atom could diffuse into TiO2 to form Cu-doped TiO2. The synergistic effect between oxygen vacancies and Cu atoms achieved about 2.4 times improved photocurrent of TiO2/Cu/TiO2 sandwich structure compared to bare TiO2 thin film. The enhanced photoactivity may be attributed to regulated electron structure of TiO2 by oxygen vacancies and Cu dopant from experimental results and density functional theory calculations. Oxygen vacancies and Cu dopant in TiO2 formed through copper metal reduction can introduce impurity levels and narrow the band gap of TiO2, thus improve the visible light response. More importantly, the Cu2+ and oxygen vacancies in TiO2 lattice can dramatically increase the charge density around conduction band and promote separation of photo-induced charge carriers. Furthermore, the oxygen vacancies on the surface may serve as active site for sufficient chemical reaction. This work presents a novel method to prepare doped metal oxides catalysts with abundant vacancies for improving photocatalytic activity.
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Affiliation(s)
- Fan Yang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
- Department of Physics, University of Science and Technology of China, Hefei 230026, China
| | - Ruizhuang Yang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Lin Yan
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Jiankun Wu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Xiaolin Liu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
- Department of Physics, University of Science and Technology of China, Hefei 230026, China
| | - Lirong Yang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Minglong Zhong
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Xuan Luo
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
| | - Lin Zhang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; (F.Y.); (R.Y.); (L.Y.); (J.W.); (X.L.); (L.Y.); (M.Z.); (L.Z.)
- Department of Physics, University of Science and Technology of China, Hefei 230026, China
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Zhang X, Li L, Zhou Q, Cao Y, Ma F, Li Y. Three-dimensionally ordered hollow sphere array Pt/In2O3–TiO2 with improved photocatalytic efficiency. NEW J CHEM 2019. [DOI: 10.1039/c9nj01488h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using polystyrene microspheres as the template, the three-dimensionally ordered hollow sphere array Pt/In2O3–TiO2 was established, which exhibited superior photocatalytic degradation efficiency and an enhanced activity in hydrogen evolution.
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Affiliation(s)
- Xinyue Zhang
- College of Materials Science and Engineering, Qiqihar University
- Qiqihar
- China
- College of Chemistry and Chemical Engineering, Qiqihar University
- Qiqihar
| | - Li Li
- College of Materials Science and Engineering, Qiqihar University
- Qiqihar
- China
- College of Chemistry and Chemical Engineering, Qiqihar University
- Qiqihar
| | - Qianlong Zhou
- College of Chemistry and Chemical Engineering, Qiqihar University
- Qiqihar
- China
| | - Yanzhen Cao
- College of Chemistry and Chemical Engineering, Qiqihar University
- Qiqihar
- China
| | - Fengyan Ma
- College of Chemistry and Chemical Engineering, Qiqihar University
- Qiqihar
- China
| | - Yi Li
- College of Chemistry and Chemical Engineering, Qiqihar University
- Qiqihar
- China
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Mezni A, Ibrahim MM, El-Kemary M, Shaltout AA, Mostafa NY, Ryl J, Kumeria T, Altalhi T, Amin MA. Cathodically activated Au/TiO2 nanocomposite synthesized by a new facile solvothermal method: An efficient electrocatalyst with Pt-like activity for hydrogen generation. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.08.083] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Enhanced degradation of ciprofloxacin by graphitized mesoporous carbon (GMC)-TiO 2 nanocomposite: Strong synergy of adsorption-photocatalysis and antibiotics degradation mechanism. J Colloid Interface Sci 2018; 527:202-213. [PMID: 29800869 DOI: 10.1016/j.jcis.2018.05.054] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 05/15/2018] [Accepted: 05/18/2018] [Indexed: 12/12/2022]
Abstract
In order to achieve remarkable synergy between adsorption and photocatalysis for antibiotics elimination from water, in this study, a graphitized mesoporous carbon (GMC)-TiO2 nanocomposite was successfully synthesized by an extended resorcinol-formaldehyde (R-F) method. In the composite, the lamellar GMC nanosheets possessed large specific surface area and mesoporous structure, and could adsorb and enrich antibiotics effectively. This could not only reduce the antibiotic concentration in water shortly, but also greatly increase the chances for antibiotics to contact with and be degraded by photocatalysts and active species. Interestingly, GMC could also facilitate the transportation of photogenerated electrons to further improve the photocatalytic efficiency of TiO2, and 15 mg/L ciprofloxacin (CIP) could be totally mineralized in 1.5 h. Meanwhile, the biological inhibition of reaction solution on luminescence bacteria decreased obviously with antibiotics degradation until non-toxicity, reinforcing the thorough elimination of antibiotics. Besides, from the viewpoint of organic chemistry, several plausible CIP degradation pathways were established using HPLC-MS technique, and an interesting intermediate with five-membered ring structure was firstly proposed, which is helpful to deeply understand CIP degradation. Strong synergy between adsorption and photocatalysis, along with quick and efficient antibiotics elimination, double confirm the great potential of GMC-TiO2 nanocomposite for practical antibiotic wastewater purification.
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Craciun AM, Focsan M, Magyari K, Vulpoi A, Pap Z. Surface Plasmon Resonance or Biocompatibility-Key Properties for Determining the Applicability of Noble Metal Nanoparticles. MATERIALS (BASEL, SWITZERLAND) 2017; 10:E836. [PMID: 28773196 PMCID: PMC5551879 DOI: 10.3390/ma10070836] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 07/06/2017] [Accepted: 07/10/2017] [Indexed: 12/12/2022]
Abstract
Metal and in particular noble metal nanoparticles represent a very special class of materials which can be applied as prepared or as composite materials. In most of the cases, two main properties are exploited in a vast number of publications: biocompatibility and surface plasmon resonance (SPR). For instance, these two important properties are exploitable in plasmonic diagnostics, bioactive glasses/glass ceramics and catalysis. The most frequently applied noble metal nanoparticle that is universally applicable in all the previously mentioned research areas is gold, although in the case of bioactive glasses/glass ceramics, silver and copper nanoparticles are more frequently applied. The composite partners/supports/matrix/scaffolds for these nanoparticles can vary depending on the chosen application (biopolymers, semiconductor-based composites: TiO₂, WO₃, Bi₂WO₆, biomaterials: SiO₂ or P₂O₅-based glasses and glass ceramics, polymers: polyvinyl alcohol (PVA), Gelatin, polyethylene glycol (PEG), polylactic acid (PLA), etc.). The scientific works on these materials' applicability and the development of new approaches will be targeted in the present review, focusing in several cases on the functioning mechanism and on the role of the noble metal.
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Affiliation(s)
- Ana Maria Craciun
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, 400271 Cluj-Napoca, Romania.
| | - Monica Focsan
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, 400271 Cluj-Napoca, Romania.
| | - Klara Magyari
- Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, 400271 Cluj-Napoca, Romania.
| | - Adriana Vulpoi
- Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, 400271 Cluj-Napoca, Romania.
| | - Zsolt Pap
- Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, 400271 Cluj-Napoca, Romania.
- Institute of Environmental Science and Technology, University of Szeged, 6720 Szeged, Hungary.
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Opoku F, Govender KK, van Sittert CGCE, Govender PP. Understanding the mechanism of enhanced charge separation and visible light photocatalytic activity of modified wurtzite ZnO with nanoclusters of ZnS and graphene oxide: from a hybrid density functional study. NEW J CHEM 2017. [DOI: 10.1039/c7nj01942d] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A hybrid ternary ZnS/GO/ZnO(001) system achieved enough driving force for splitting water into H2 gas.
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Affiliation(s)
- Francis Opoku
- Department of Applied Chemistry
- University of Johannesburg
- Johannesburg
- South Africa
| | - Krishna Kuben Govender
- Council for Scientific and Industrial Research
- Meraka Institute
- Center for High Performance Computing
- Cape Town
- South Africa
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Rahman ZU, Wei N, Li Z, Sun W, Wang D. Preparation of hollow mesoporous silica nanospheres: controllable template synthesis and their application in drug delivery. NEW J CHEM 2017. [DOI: 10.1039/c7nj02804k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Hollow mesoporous silica nanospheres were prepared using iron oxide nanoparticle and polymer nanosphere templates and then applied for drug delivery.
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Affiliation(s)
- Zia Ur Rahman
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- China
| | - Ning Wei
- Qingdao Center for Resource Chemistry and New Materials
- Qingdao 266000
- China
| | - Zhaoxia Li
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- China
| | - Weixiang Sun
- Qingdao Center for Resource Chemistry and New Materials
- Qingdao 266000
- China
| | - Daoai Wang
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000
- China
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