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Li Y, Guo B, Liu K, Li K, Song J, Wang C, Wan Y, Han D, Duan Q, Yang S. Highly Efficient and Reusable PI/TiO 2 Organic-Inorganic Microfibers for Sustainable Photocatalytic Degradation of Multiple Organic Pollutants under Simulated Sunlight. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16904-16914. [PMID: 37962138 DOI: 10.1021/acs.langmuir.3c02644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Herein, a series of polyimide (PI)/titanium dioxide (TiO2) organic-inorganic flexible composite microfibers with high photocatalytic performance and good reusability were prepared by combining electrospinning technology and a hydrothermal method. Under simulated sunlight, the photocatalytic characteristics of the as-prepared PI nanofibers, TiO2 nanorods, and PI/TiO2 microfibers were evaluated with photocatalytic degradation of Rhodamine B (RhB) solution. Among the tested samples, PI/TiO2-3 mL hydrochloric acid-160 °C-14 h (PI/TiO-3-160-14) (100%) exhibited a superior photocatalytic degradation rate compared to pure PI (84.0%) and TiO2 (62.2%). The enhancement of the photocatalytic performance was attributed to the Z-scheme heterojunction mechanism. When the interface was irradiated by simulated sunlight, the band edge bending, built-in electric field, and Coulomb interaction synergistically facilitated the separation and transport of electron-hole pairs in the heterojunction. This enhanced the oxidation and reduction abilities of the valence and conduction bands of PI/TiO2. These results were adequately verified by X-ray photoelectron spectroscopy (XPS) analyses and radical trapping experiments. Additionally, PI/TiO2 microfibers also demonstrated excellent photocatalytic activity toward methylene blue (MB, 81.4%), methyl orange (MO, 95.9%), and malachite green (KG, 98.9%), underscoring the versatile applicability of PI/TiO2. Further supplementary investigations illustrated that PI/TiO2 microfibers also possess excellent photostability during our extensive recycling photocatalytic experiments.
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Affiliation(s)
- Yanru Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Boyang Guo
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Keyan Liu
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Kaiyue Li
- College of Science, Changchun University, Changchun 130022, People's Republic of China
| | - Jing Song
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Cong Wang
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Yuchun Wan
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Donglai Han
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Qian Duan
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
| | - Shuo Yang
- College of Science, Changchun University, Changchun 130022, People's Republic of China
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Kang DC, Hee Pyen S, Kim EJ, Woo Kim Y, Suh YW, Kim DP, Shin CH, Min HK. Hydrogen-free carbon monoxide production through decomposition of formic acid over a HPW/TiO2 catalyst. J IND ENG CHEM 2023. [DOI: 10.1016/j.jiec.2023.03.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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3
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Eddy DR, Permana MD, Sakti LK, Sheha GAN, Solihudin, Hidayat S, Takei T, Kumada N, Rahayu I. Heterophase Polymorph of TiO 2 (Anatase, Rutile, Brookite, TiO 2 (B)) for Efficient Photocatalyst: Fabrication and Activity. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:704. [PMID: 36839072 PMCID: PMC9965282 DOI: 10.3390/nano13040704] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 07/30/2023]
Abstract
TiO2 exists naturally in three crystalline forms: Anatase, rutile, brookite, and TiO2 (B). These polymorphs exhibit different properties and consequently different photocatalytic performances. This paper aims to clarify the differences between titanium dioxide polymorphs, and the differences in homophase, biphase, and triphase properties in various photocatalytic applications. However, homophase TiO2 has various disadvantages such as high recombination rates and low adsorption capacity. Meanwhile, TiO2 heterophase can effectively stimulate electron transfer from one phase to another causing superior photocatalytic performance. Various studies have reported the biphase of polymorph TiO2 such as anatase/rutile, anatase/brookite, rutile/brookite, and anatase/TiO2 (B). In addition, this paper also presents the triphase of the TiO2 polymorph. This review is mainly focused on information regarding the heterophase of the TiO2 polymorph, fabrication of heterophase synthesis, and its application as a photocatalyst.
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Affiliation(s)
- Diana Rakhmawaty Eddy
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Muhamad Diki Permana
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
- Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi, Kofu 400-8511, Japan
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Lintang Kumoro Sakti
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Geometry Amal Nur Sheha
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Solihudin
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Sahrul Hidayat
- Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Iman Rahayu
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
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Jin H, You W, Tian K, Kong E, Ye X, Wang Y, Ye J. Construction of TiO 2(B)/Anatase Heterophase Junctions via a Water-Induced Phase Transformation Strategy for Enhanced Photocatalytic Hydrogen Production. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15282-15293. [PMID: 36443246 DOI: 10.1021/acs.langmuir.2c02522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The development of facile and green solution-phase routes toward the fabrication of TiO2-based heterophase junctions with a delicate control of phase and structure is a challenging task. Herein, we report a simple and convenient method to controllably fabricate TiO2(B)/anatase heterophase junctions, which was successfully realized by utilizing the ideal great solvent of water to treat the presynthesized TiO2(B) nanosheet precursor at a low temperature of 80 °C. On the basis of phase structure transformation and morphology evolution data, the formation of these TiO2(B)/anatase heterophase junctions was reasonably explained by a novel water-induced TiO2(B) → anatase phase transformation mechanism. Benefiting from the desirable structural and photoelectronic advantages of more exposed active sites, enhanced light absorbance, and promoted separation of photogenerated electron-hole pairs, the thus-transformed TiO2(B)/anatase heterophase junctions exhibit fascinating photocatalytic performance in water splitting. Specifically, with the help of Pt as a cocatalyst and methanol as a sacrificial agent, the H2 production rate of optimized TiO2(B)/anatase heterophase junction reaches 6.92 mmol·g-1·h-1, which is almost 7.1 and 2.1 times higher than those of the pristine TiO2(B) nanosheets and the final anatase nanocrystals. More interestingly, the TiO2(B)/anatase heterophase junction also delivers prominent activity toward pure water splitting to simultaneously produce H2 and H2O2, with evolution rates of up to 1.10 and 0.55 mmol·g-1·h-1, respectively. Our work may advance the facile green solvent-mediated synthesis of metal oxide-based heterophase junctions for applications in energy- and environmental-related areas.
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Affiliation(s)
- Haoran Jin
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
| | - Wuyang You
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
| | - Kaidan Tian
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
| | - Ershuai Kong
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
| | - Xiaozhou Ye
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
| | - Yun Wang
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
| | - Jianfeng Ye
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan430070, China
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Daneshnazar M, Jaleh B, Eslamipanah M, Varma RS. Optical and gas sensing properties of TiO2/RGO for methanol, ethanol and acetone vapors. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.110014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Preparation of amorphous Bi4V0.2Ti2.8O12 and its photocatalytic activity for the degradation of Basic Red 2. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04765-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Ma J, Chen L, Liu Y, Xu T, Ji H, Duan J, Sun F, Liu W. Oxygen defective titanate nanotubes induced by iron deposition for enhanced peroxymonosulfate activation and acetaminophen degradation: Mechanisms, water chemistry effects, and theoretical calculation. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126180. [PMID: 34102367 DOI: 10.1016/j.jhazmat.2021.126180] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 06/12/2023]
Abstract
The large consumption of acetaminophen (APAP) worldwide and unsatisfactory treatment efficiencies by conventional wastewater treatment processes give rise to the seeking of new technology for its effective removal. Herein, we proposed a facile one-step hydrothermal method to synthesize defective iron deposited titanate nanotubes (Fe/TNTs) for peroxymonosulfate (PMS) activation and APAP degradation. The retarded first-order reaction rate of APAP degradation by Fe/TNTs was 5.1 times higher than that of neat TNTs. Characterizations indicated iron deposition effectively induced oxygen vacancies and Ti3+, facilitating the electrical conductivity and PMS binding affinity of Fe/TNTs. Besides, oxygen vacancies could act as an electron mediator through PMS activation by iron. Moreover, the formation of Fe-O-Ti bond facilitated the synergistic redox coupling between Fe and Ti, further enhancing the PMS activation. SO4•- was the major radical, causing C-N bond cleavage and decreasing the overall toxicity. In contrast, APAP degradation by neat TNTs-PMS system mainly works through nonradical reaction. The Fe/TNTs activated PMS showed desired APAP removal under mild water chemistry conditions and good reusability. This work is expected to expand the potential application of titanate nanomaterials for PMS activation, and shed light on facile synthesis of oxygen defective materials for sulfate-radical-based advanced oxidation processes.
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Affiliation(s)
- Jun Ma
- School of Environmental Science and engineering, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024, China
| | - Long Chen
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Peking University, Beijing 100871, China
| | - Yue Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Tianyuan Xu
- School of Resource and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
| | - Haodong Ji
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Peking University, Beijing 100871, China
| | - Jun Duan
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Peking University, Beijing 100871, China.
| | - Fengbin Sun
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Peking University, Beijing 100871, China.
| | - Wen Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Peking University, Beijing 100871, China
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Saha S, Victorious A, Soleymani L. Modulating the photoelectrochemical response of titanium dioxide (TiO2) photoelectrodes using gold (Au) nanoparticles excited at different wavelengths. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138154] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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9
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Preparation of Ti-Nb-Fe-O Nanotubes on Ti10NbxFe Alloy and the Application for Photocatalytic Degradation under Solar Irradiation. Catalysts 2021. [DOI: 10.3390/catal11030327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Highly oriented and self-ordered titanium-niobium-iron mixed oxide nanotubes were synthesized by anodizing Ti10NbxFe alloys in ethylene glycol electrolytes containing NH4F and water at 20 °C. The nanostructure morphologies were found to depend closely on the nature of the alloy substrates. The results demonstrate the possibility of growing mixed oxide nanotubes possessing several-micrometer-thick layers by a simple and straightforward electrochemical route. The methylene blue degradation rate of fabricated Ti-Nb-Fe-O nanotubes increased by 33% compared to TiO2 nanotubes and TiO2 nanoparticle films under solar irradiation. The combination of the gully-like morphology and the rich defects introduced by Nb and Fe co-doping in Ti-Nb-Fe-O mixed nanotube oxides was demonstrated to be beneficial for enhanced photocatalytic degradation performance. Ti-Nb-Fe-O nanotubes can achieve effective photodegradation without secondary pollution with more reusability than powder photocatalysts.
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Balapure A, Ganesan R. Anatase versus Triphasic TiO 2: Near-identical synthesis and comparative structure-sensitive photocatalytic degradation of methylene blue and 4-chlorophenol. J Colloid Interface Sci 2021; 581:205-217. [PMID: 32771732 DOI: 10.1016/j.jcis.2020.07.096] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/12/2020] [Accepted: 07/19/2020] [Indexed: 01/17/2023]
Abstract
Studies on photocatalytic activity of monophasic and biphasic TiO2 have been well explored. However, detailed studies on the photocatalytic activity of triphasic titania, as opposed to monophasic or biphasic TiO2 are scarce. Here we report a comparative structure-sensitive photocatalytic study of triphasic versus anatase TiO2, both have been synthesized under near-identical conditions through a customized sol-gel approach. The composition of the phases is tuned just by varying the thermal pre-treatment conditions of TiO2 gel that has been subsequently subjected to calcination at 300 °C. Interestingly, when the pre-treatment temperature of the gel is systematically increased from 50 to 250 °C, a transition from anatase to triphasic (anatase, rutile, and brookite) and then again to anatase has been observed. The synthesized TiO2 phase compositions have been thoroughly characterized for their structural, optical, electrical, surface and morphological properties. Among the different phase compositions, triphasic titania having a significant proportion of rutile has been found to exhibit the highest photocatalytic activity, as probed using model organic pollutants, Methylene Blue (MB) and 4-Chlorophenol (4-CP). In addition to the earlier known factors such as effective heterojunction, and favorable position of the valence band (VB), an important contribution to the high photocatalytic activity of triphasic TiO2 has been experimentally found to stem from the additional electron density in VB that is attributed to the lattice contraction of anatase phase owing to the coexistence of other two phases. The study provides fundamental insights into the energetics that impact the photocatalytic activity of triphasic versus anatase TiO2.
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Affiliation(s)
- Aniket Balapure
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
| | - Ramakrishnan Ganesan
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India.
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Duan J, Pan P, Xue K, Zhao H, Zhang Z, Wang W. Energy band regulation and heterophase surface heterojunction in B-C-N-TiO2 catalysts for enhanced photocatalytic activity. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01493-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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12
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Au-TiO2 Synthesized by a Microwave- and Sonochemistry-Assisted Sol-Gel Method: Characterization and Application as Photocatalyst. Catalysts 2020. [DOI: 10.3390/catal10091052] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Titanium dioxide (TiO2) is a widely used and well studied photocatalyst synthesized using different methodologies, including sol-gel, which allows one to modify the material in a one-pot step. By using a microwave- and sonochemistry-assisted sol-gel method, x wt.% Au-TiO2 photocatalysts were successfully synthesized. Physicochemical characterization of the photocatalysts shows an average crystallite size of 10.5 nm and an even morphological distribution of spherical particles with the sonochemistry synthesis method. For the microwave method an average value of crystallite size of 8.3 nm was found and it presents an increase with the amount of Au load. The cyclic voltammetric response and Mott-Schottky analysis are consistent with a semiconductor material containing metallic particles and for a heterophase junction of anatase and brookite with oxygen vacancies, respectively. The photocatalytic activity was assessed by paracetamol degradation in an aqueous solution as model. The sonochemistry-synthesized photocatalysts display the most promising results as they have a better paracetamol removal and the amount of gold in the catalyst (0.7 wt.%) was found to be optimal for this process.
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Yu F, Wang C, Li Y, Ma H, Wang R, Liu Y, Suzuki N, Terashima C, Ohtani B, Ochiai T, Fujishima A, Zhang X. Enhanced Solar Photothermal Catalysis over Solution Plasma Activated TiO 2. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2000204. [PMID: 32832348 PMCID: PMC7435248 DOI: 10.1002/advs.202000204] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 05/25/2020] [Indexed: 05/22/2023]
Abstract
Colored wide-bandgap semiconductor oxides with abundant mid-gap states have long been regarded as promising visible light responsive photocatalysts. However, their catalytic activities are hampered by charge recombination at deep level defects, which constitutes the critical challenge to practical applications of these oxide photocatalysts. To address the challenge, a strategy is proposed here that includes creating shallow-level defects above the deep-level defects and thermal activating the migration of trapped electrons out of the deep-level defects via these shallow defects. A simple and scalable solution plasma processing (SPP) technique is developed to process the presynthesized yellow TiO2 with numerous oxygen vacancies (Ov), which incorporates hydrogen dopants into the TiO2 lattice and creates shallow-level defects above deep level of Ov, meanwhile retaining the original visible absorption of the colored TiO2. At elevated temperature, the SPP-treated TiO2 exhibits a 300 times higher conversion rate for CO2 reduction under solar light irradiation and a 7.5 times higher removal rate of acetaldehyde under UV light irradiation, suggesting the effectiveness of the proposed strategy to enhance the photoactivity of colored wide-bandgap oxides for energy and environmental applications.
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Affiliation(s)
- Fei Yu
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
| | - Changhua Wang
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
| | - Yingying Li
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
| | - He Ma
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
| | - Rui Wang
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
| | - Yichun Liu
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
| | - Norihiro Suzuki
- Photocatalysis International Research CenterResearch Institute for Science & TechnologyTokyo University of Science2641 YamazakiNodaChiba278‐8510Japan
| | - Chiaki Terashima
- Photocatalysis International Research CenterResearch Institute for Science & TechnologyTokyo University of Science2641 YamazakiNodaChiba278‐8510Japan
| | - Bunsho Ohtani
- Graduate School of Environmental ScienceHokkaido UniversitySapporo060‐0810Japan
| | - Tsuyoshi Ochiai
- Materials Analysis GroupKawasaki Technical Support DepartmentLocal Independent Administrative Agency Kanagawa Institute of industrial Science and Technology (KISTEC)Kanagawa213‐0012Japan
| | - Akira Fujishima
- Photocatalysis International Research CenterResearch Institute for Science & TechnologyTokyo University of Science2641 YamazakiNodaChiba278‐8510Japan
| | - Xintong Zhang
- Key Laboratory of UV‐Emitting Materials and Technology of Chinese Ministry of EducationNortheast Normal UniversityChangchun130024China
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Tan R, Wang Y, Jin Z, Zhang P, Luo H, Liu D, Mamba BB, Kuvarega AT, Gui J. Preparation of carbon-coated brookite@anatase TiO 2 heterophase junction nanocables with enhanced photocatalytic performance. Photochem Photobiol Sci 2020; 19:966-975. [PMID: 32525187 DOI: 10.1039/d0pp00004c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-dimensional TiO2@C nanocables with a heterophase junction have been successfully prepared by coating brookite@anatase TiO2 with a thin layer of hydrothermal carbon (HTC). Compared with anatase TiO2, the biphase brookite@anatase structure can reduce the recombination rate of the excited electron/hole pairs of TiO2. The HTC coating not only enhances the adsorption capability of the TiO2 catalyst for organic pollutants but also facilitates photogenerated electron transfer to further increase its photocatalytic activity. Therefore, compared with anatase TiO2, brookite@anatase TiO2, and TiO2@C, the brookite@anatase TiO2@C shows the highest photocatalytic activity for the photodegradation of tetracycline (TC) under the irradiation of UV-visible light. Moreover, ˙O2 has been proved to be the predominant active species for the photodegradation of TC, and the photocatalytic mechanism of brookite@anatase TiO2@C nanocables has also been proposed.
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Affiliation(s)
- Rui Tan
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Yonglin Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Zhouzheng Jin
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Peng Zhang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China
| | - Hengzhi Luo
- Fushun YiKeSi New Materials Co., Ltd, 113000, Fushun, Liaoning, China
| | - Dan Liu
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China. .,College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa.
| | - Bhekie B Mamba
- College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa
| | - Alex T Kuvarega
- College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa
| | - Jianzhou Gui
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, 300387, Tianjin, China.,College of Science, Engineering and Technology, University of South Africa, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa
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15
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Ding L, Yang S, Liang Z, Qian X, Chen X, Cui H, Tian J. TiO2 nanobelts with anatase/rutile heterophase junctions for highly efficient photocatalytic overall water splitting. J Colloid Interface Sci 2020; 567:181-189. [DOI: 10.1016/j.jcis.2020.02.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/02/2020] [Accepted: 02/05/2020] [Indexed: 12/20/2022]
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Shezad N, Maafa IM, Johari K, Hafeez A, Akhter P, Shabir M, Raza A, Anjum H, Hussain M, Tahir M. Carbon Nanotubes Incorporated Z-Scheme Assembly of AgBr/TiO 2 for Photocatalytic Hydrogen Production under Visible Light Irradiations. NANOMATERIALS 2019; 9:nano9121767. [PMID: 31835847 PMCID: PMC6956272 DOI: 10.3390/nano9121767] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/03/2019] [Accepted: 12/04/2019] [Indexed: 11/16/2022]
Abstract
Photocatalytic H2 production is a promising strategy toward green energy and alternative to carbon-based fuels which are the root cause of global warming and pollution. In this study, carbon nanotubes (CNTs) incorporated Z-scheme assembly of AgBr/TiO2 was developed for photocatalytic H2 production under visible light irradiations. Synthesized photocatalysts were characterized through transmission electron microscope (TEM), X-ray photoelectron spectra (XPS), X-ray diffractometer (XRD), Fourier transform infrared (FTIR), photoluminescence spectra (PL), Brunauer Emmet-Teller(BET), and UV-vis spectroscopy analysis techniques. The composite photocatalysts exhibited a H2 production of 477 ppm which was three-folds higher than that produced by TiO2. The good performance was attributed to the strong interaction of three components and the reduced charge recombination, which was 89 and 56.3 times lower than the TiO2 and AgBr/TiO2. Furthermore, the role of surface acidic and basic groups was assessed and the photocatalytic results demonstrated the importance of surface functional groups. In addition, the composites exhibited stability and reusability for five consecutive cycles of reaction. Thus, improved performance of the photocatalyst was credited to the CNTs as an electron mediator, surface functional groups, higher surface area, enhanced charge separation and extended visible light absorption edge. This work provides new development of Z-scheme photocatalysts for sustainable H2 production.
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Affiliation(s)
- Nasir Shezad
- Department of Chemical Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia; (N.S.); (K.J.); (H.A.)
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan; (A.H.); (M.S.); (A.R.)
| | - Ibrahim M. Maafa
- Department of Chemical Engineering, College of Engineering, Jazan University, Jazan 45142, Saudi Arabia
- Correspondence: (I.M.M.); (M.H.); (M.T.)
| | - Khairiraihanna Johari
- Department of Chemical Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia; (N.S.); (K.J.); (H.A.)
- Centre of Contaminant Control & Utilization, Institute of Contaminant Management (ICM), Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia
| | - Ainy Hafeez
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan; (A.H.); (M.S.); (A.R.)
| | - Parveen Akhter
- Department of Chemistry, The University of Lahore, 1-km Raiwind Road, Lahore 54000, Pakistan;
| | - Maira Shabir
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan; (A.H.); (M.S.); (A.R.)
| | - Ali Raza
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan; (A.H.); (M.S.); (A.R.)
| | - Hirra Anjum
- Department of Chemical Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia; (N.S.); (K.J.); (H.A.)
| | - Murid Hussain
- Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan; (A.H.); (M.S.); (A.R.)
- Correspondence: (I.M.M.); (M.H.); (M.T.)
| | - Muhammad Tahir
- Chemical Reaction Engineering Group (CREG), School of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai, Johor Bahru 81310 UTM, Johor, Malaysia
- Correspondence: (I.M.M.); (M.H.); (M.T.)
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17
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Liu G, Qin J, Zhou Z, Liu C, Li F, Wu W. Mesoporous V‐TiO
2
Catalysts with Crystalline Anatase‐Rutile Mixed Phases for Naphthalene Degradation. ChemistrySelect 2019. [DOI: 10.1002/slct.201902487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Guang Liu
- College of Chemical EngineeringNanjing Tech University Nanjing 210009 P. R. China
| | - Juan Qin
- Productivity Center of Jiangsu ProvinceTechnology and Finance Service Center of Jiangsu Province Nanjing 210042 P. R. China
| | - Zhiwei Zhou
- College of Chemical EngineeringNanjing Tech University Nanjing 210009 P. R. China
| | - Chuanfa Liu
- College of Chemical EngineeringNanjing Tech University Nanjing 210009 P. R. China
| | - Fanqing Li
- College of Chemical EngineeringNanjing Tech University Nanjing 210009 P. R. China
| | - Wenliang Wu
- College of Chemical EngineeringNanjing Tech University Nanjing 210009 P. R. China
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18
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Song L, Rawolle M, Hohn N, Gutmann JS, Frielinghaus H, Müller-Buschbaum P. In Situ Monitoring Mesoscopic Deformation of Nanostructured Porous Titania Films Caused by Water Ingression. ACS APPLIED MATERIALS & INTERFACES 2019; 11:32552-32558. [PMID: 31397150 DOI: 10.1021/acsami.9b10750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Nanostructured porous titania films are used in many energy-related applications. In this work, the temporal evolution of the mesoscopic deformation of mesoporous titania films synthesized via block copolymer-assisted sol-gel chemistry is investigated with in situ grazing incidence small-angle neutron scattering (GISANS) during exposure to D2O vapor. Two types of mesoporous titania films are compared, which have a different degree of structural stability, depending on the applied annealing temperature (400 °C vs 600 °C) in a nitrogen atmosphere. Water ingression causes a gradual structure deformation in terms of decreasing center-to-center distances and broadening of the size distribution of the titania nanostructures. Based on the evolution of the mesopore size obtained from in situ GISANS measurements, the results show that structures synthesized at lower temperature undergo a stronger deformation because of the lower elastic modulus originating from larger pores, despite having a higher degree of order.
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Affiliation(s)
- Lin Song
- Xi'an Institute of Flexible Electronics (IFE) , Northwestern Polytechnical University (NPU) , Xi'an 710072 , Shaanxi , China
- Lehrstuhl für Funktionelle Materialien, Physik-Department , Technische Universität München , James-Franck-Str. 1 , Garching 85748 , Germany
| | - Monika Rawolle
- Lehrstuhl für Funktionelle Materialien, Physik-Department , Technische Universität München , James-Franck-Str. 1 , Garching 85748 , Germany
| | - Nuri Hohn
- Lehrstuhl für Funktionelle Materialien, Physik-Department , Technische Universität München , James-Franck-Str. 1 , Garching 85748 , Germany
| | - Jochen S Gutmann
- Fakultät für Chemie, Physikalische Chemie , Universität Duisburg-Essen , Universitätsstr. 5 , Essen 45141 , Germany
| | - Henrich Frielinghaus
- Jülich Center for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ) , Forschungszentrum Jülich GmbH , Lichtenbergstr. 1 , Garching 85748 , Germany
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien, Physik-Department , Technische Universität München , James-Franck-Str. 1 , Garching 85748 , Germany
- Heinz Maier-Leibnitz Zentrum (MLZ) , Technische Universität München , Lichtenbergstr. 1 , 85748 Garching , Germany
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19
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Lu KQ, Qi MY, Tang ZR, Xu YJ. Earth-Abundant MoS 2 and Cobalt Phosphate Dual Cocatalysts on 1D CdS Nanowires for Boosting Photocatalytic Hydrogen Production. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11056-11065. [PMID: 31365263 DOI: 10.1021/acs.langmuir.9b01409] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cocatalysts play a significant role in accelerating the catalytic reactions of semiconductor photocatalyst. In particular, a semiconductor assembled with dual cocatalysts, i.e., reduction and oxidation cocatalysts, can obviously enhance the photocatalytic performance because of the synergistic effect of fast consumption of photogenerated electrons and holes simultaneously. However, in most cases, noble metal cocatalysts are employed, which tremendously increases the cost of the photocatalysts and restricts their large-scale applications. Herein, on the platform of one-dimensional (1D) CdS nanowires, we have utilized the earth-abundant dual cocatalysts, MoS2 and cobalt phosphate (Co-Pi), to construct the CdS@MoS2@Co-Pi (CMC) core-shell hybrid photocatalysts. In this dual-cocatalyst system, Co-Pi is in a position to expedite the migration of holes from CdS, while MoS2 acts as an electron transporter as well as active sites to accelerate the surface water reduction reaction. Taking the advantages of the dual-cocatalyst system, the prepared CMC hybrid shows an obvious enhancement of both the photoactivity and photostability toward hydrogen production compared with bare 1D CdS nanowires and binary hybrids (CdS@MoS2 and CdS@Co-Pi). This work highlights the promising prospects for rational utilization of earth-abundant dual cocatalysts to design low-cost and efficient hybrids toward boosting photoredox catalysis.
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Affiliation(s)
- Kang-Qiang Lu
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry , Fuzhou University , Fuzhou 350116 , P. R. China
- College of Chemistry, New Campus , Fuzhou University , Fuzhou 350116 , P. R. China
| | - Ming-Yu Qi
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry , Fuzhou University , Fuzhou 350116 , P. R. China
- College of Chemistry, New Campus , Fuzhou University , Fuzhou 350116 , P. R. China
| | - Zi-Rong Tang
- College of Chemistry, New Campus , Fuzhou University , Fuzhou 350116 , P. R. China
| | - Yi-Jun Xu
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry , Fuzhou University , Fuzhou 350116 , P. R. China
- College of Chemistry, New Campus , Fuzhou University , Fuzhou 350116 , P. R. China
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20
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Liu X, Zhou Z, Lu Y, Wang T, Huo P, Yan Y. Increasing visible-light absorption for photocatalysis with black 2D Bi4Ti3O12 nanosheets. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.02.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Jia Y, Ma Y, Zhu L, Dong J, Lin Y. Efficient visible-light-responsive photocatalyst: Hybrid TiO2-Ag3PO4 nanorods. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.01.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Kuang J, Xing Z, Yin J, Li Z, Zhu Q, Zhou W. Surface plasma Ag-decorated single-crystalline TiO2−x(B) nanorod/defect-rich g-C3N4 nanosheet ternary superstructure 3D heterojunctions as enhanced visible-light-driven photocatalyst. J Colloid Interface Sci 2019; 542:63-72. [DOI: 10.1016/j.jcis.2019.01.124] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 01/29/2019] [Accepted: 01/29/2019] [Indexed: 11/29/2022]
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23
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Assembly of surface-defect single-crystalline strontium titanate nanocubes acting as molecular bricks onto surface-defect single-crystalline titanium dioxide (B) nanorods for efficient visible-light-driven photocatalytic performance. J Colloid Interface Sci 2019; 537:441-449. [DOI: 10.1016/j.jcis.2018.11.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/09/2018] [Accepted: 11/12/2018] [Indexed: 12/25/2022]
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24
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SILAR preparation of Bi2S3 nanoparticles sensitized TiO2 nanotube arrays for efficient solar cells and photocatalysts. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.08.050] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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25
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Yang X, Wu X, Li J, Liu Y. TiO2–Au composite nanofibers for photocatalytic hydrogen evolution. RSC Adv 2019; 9:29097-29104. [PMID: 35528418 PMCID: PMC9071834 DOI: 10.1039/c9ra05113a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 09/09/2019] [Indexed: 01/10/2023] Open
Abstract
TiO2-based materials for photocatalytic hydrogen (H2) evolution have attracted much interest as a renewable approach for clean energy applications. TiO2–Au composite nanofibers (NFs) with an average fiber diameter of ∼160 nm have been fabricated by electrospinning combined with calcination treatment. In situ reduced gold nanoparticles (NPs) with uniform size (∼10 nm) are found to disperse homogenously in the TiO2 NF matrix. The TiO2–Au composite NFs catalyst can significantly enhance the photocatalytic H2 generation with an extremely high rate of 12 440 μmol g−1 h−1, corresponding to an adequate apparent quantum yield of 5.11% at 400 nm, which is 25 times and 10 times those of P25 (584 μmol g−1 h−1) and pure TiO2 NFs (1254 μmol g−1 h−1), respectively. Furthermore, detailed studies indicate that the H2 evolution efficiency of the TiO2–Au composite NF catalyst is highly dependent on the gold content. This work provides a strategy to develop highly efficient catalysts for H2 evolution. The H2 production rate of TiO2–Au nanofibers is dramatically improved to 12 440 μmol g−1 h−1, 10 times that of pure TiO2.![]()
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Affiliation(s)
- Xiaojiao Yang
- College of Materials Science and Engineering
- Sichuan University
- Chengdu 610065
- P. R. China
| | - Xuelian Wu
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of MOE
- Institute of Microscale Optoelectronics
- Shenzhen University
- Shenzhen 518060
- China
| | - Jun Li
- College of Materials Science and Engineering
- Sichuan University
- Chengdu 610065
- P. R. China
| | - Ying Liu
- College of Materials Science and Engineering
- Sichuan University
- Chengdu 610065
- P. R. China
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26
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Cao S, Huang W, Wu L, Tian M, Song Y. On the Interfacial Adhesion between TiO 2 Nanotube Array Layer and Ti Substrate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13888-13896. [PMID: 30362766 DOI: 10.1021/acs.langmuir.8b03408] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Anodic titania nanotube arrays (TNTAs) with higher aspect ratio are observed to be liable to spontaneous curling or delamination from the underlying titanium (Ti) metal once dried because of the poor interfacial adhesion of the TNTA layer to the underlying Ti, especially when a thin Ti sheet is used. The interfacial adhesion strength was shown to decrease with increasing thickness of the TNTA layer. In this work, although the preparation of TNTAs in a frequently used fluoride-containing solution was completed, different anodization processes were further performed at lower current densities or at lower voltages for a short time in the same electrolyte to increase the adhesion. The mechanical test demonstrated that better adhesion properties have been achieved by applying these anodization posttreatment processes. It is believed that during the fabrication of TNTAs, a large residual stress at the interface of the nanotube layer and the underlying Ti is created. It is the residual stress that leads to the weak interfacial adhesion. The anodization posttreatment processes can reduce or eliminate the residual stress, thereby improving the interfacial adhesion. Further, these processes can also boost the performances of TNTAs for supercapacitors. When the anodization posttreatment processes are implemented at 1 mA cm-2 or at 10 V for 5 min, considerable improvements in the interfacial adhesion are observed. Particularly, both posttreatment processes are also applicable to the very thin Ti sheet (∼18 μm). The realization of robust and adherent TNTAs grown on very thin Ti sheets can not only significantly improve the volumetric capacitances of TNTAs but also make TNTAs an attractive material in flexible supercapacitor applications.
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Affiliation(s)
- Shikai Cao
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry , Nanjing University of Science and Technology , Nanjing 210094 , P. R. China
| | - Wenqiang Huang
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry , Nanjing University of Science and Technology , Nanjing 210094 , P. R. China
| | - Lizhen Wu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry , Nanjing University of Science and Technology , Nanjing 210094 , P. R. China
| | - Mengmeng Tian
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry , Nanjing University of Science and Technology , Nanjing 210094 , P. R. China
| | - Ye Song
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry , Nanjing University of Science and Technology , Nanjing 210094 , P. R. China
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27
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Song L, Rawolle M, Hohn N, Gutmann JS, Frielinghaus H, Müller-Buschbaum P. Deformation of Mesoporous Titania Nanostructures in Contact with D 2 O Vapor. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1801461. [PMID: 29968418 DOI: 10.1002/smll.201801461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 05/17/2018] [Indexed: 06/08/2023]
Abstract
For many applications, mesoporous titania nanostructures are exposed to water or need to be backfilled via infiltration with an aqueous solution, which can cause deformations of the nanostructure by capillary forces. In this work, the degree of deformation caused by water infiltration in two types of mesoporous, nanostructured titania films exposed to water vapor is compared. The different types of nanostructured titania films are prepared via a polymer template assisted sol-gel synthesis in conjunction with a polymer-template removal at high-temperatures under ambient conditions versus nitrogen atmosphere. Information about surface and inner morphology is extracted by scanning electron microscopy and grazing incidence small-angle neutron scattering (GISANS) measurements, respectively. Furthermore, complementary information on thin film composition and porosity are probed via X-ray reflectivity. The backfilling induced deformation of near surface structures and structures inside the mesoporous titania films is determined by GISANS before and after D2 O infiltration. The respective atmosphere used for template removal influences the details of the titania nanostructure and strongly impacts the degree of water induced deformation. Drying of the films shows reversibility of the deformation.
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Affiliation(s)
- Lin Song
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany
| | - Monika Rawolle
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany
| | - Nuri Hohn
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany
| | - Jochen S Gutmann
- Fakultät für Chemie, Physikalische Chemie & CENIDE, Universität Duisburg-Essen, Universitätsstr. 5, 45141, Essen, Germany
| | - Henrich Frielinghaus
- Jülich Center for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748, Garching, Germany
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany
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28
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Gao J, Lyu J, Li J, Shao J, Wang Y, Ding W, Cheng R, Wang S, He Z. Localization and Stabilization of Photogenerated Electrons at TiO 2 Nanoparticle Surface by Oxygen at Ambient Temperature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7034-7041. [PMID: 29806936 DOI: 10.1021/acs.langmuir.8b01011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the mechanism by which oxygen adsorption influences the separation behavior of charge carriers is important in photocatalytic removal of air pollutants. In this study, we performed steady-state surface photovoltage and surface photocurrent spectroscopy combined with an atmosphere control system to determine the effect of oxygen on the charge separation behavior at the surface of anatase TiO2 nanoparticles at ambient temperature. Results showed that photogenerated electrons were movable in N2 atmosphere but were localized in O2 atmosphere. O2 obviously enhanced the stabilization of the localized photogenerated electrons when the surface defects of TiO2 were fully occupied by adsorbed O2. Moreover, O2 adsorption increased the energy demand for exciting electrons from the valence band to localized surface defect states and reduced the density of band tail states. These findings suggest us that the effect of gaseous species on the mobility and stability of charge carriers should be considered to understand the photocatalytic degradation of air pollutants.
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29
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Shrestha NK, Bui HT, Lee T, Noh YY. Interfacial Engineering of Nanoporous Architectures in Ga 2O 3 Film toward Self-Aligned Tubular Nanostructure with an Enhanced Photocatalytic Activity on Water Splitting. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4575-4583. [PMID: 29590525 DOI: 10.1021/acs.langmuir.8b00670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The present work demonstrates the formation of self-aligned nanoporous architecture of gallium oxide by anodization of gallium metal film controlled at -15 °C in aqueous electrolyte consisting of phosphoric acid. SEM examination of the anodized film reveals that by adding ethylene glycol to the electrolyte and optimizing the ratio of phosphoric acid and water, chemical etching at the oxide/electrolyte interfaces can be controlled, leading to the formation of aligned nanotubular oxide structures with closed bottom. XPS analysis confirms the chemical composition of the oxide film as Ga2O3. Further, XRD and SAED examination reveals that the as-synthesized nanotubular structure is amorphous, and can be crystallized to β-Ga2O3 phase by annealing the film at 600 °C. The nanotubular structured film, when used as photoanode for photoelectrochemical splitting of water, achieved a higher photocurrent of about two folds than that of the nanoporous film, demonstrating the rewarding effect of the nanotubular structure. In addition, the work also demonstrates the formation of highly organized nonporous Ga2O3 structure on a nonconducting glass substrate coated with thin film of Ga-metal, highlighting that the current approach can be extended for the formation of self-organized nanoporous Ga2O3 thin film even on nonconducting flexible substrates.
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Affiliation(s)
- Nabeen K Shrestha
- Department of Energy and Materials Engineering , Dongguk University , Seoul 04620 , Republic of Korea
| | - Hoa Thi Bui
- Department of Chemistry , Hanynag University , Seoul - 04763 , Republic of Korea
| | - Taegweon Lee
- Department of Energy and Materials Engineering , Dongguk University , Seoul 04620 , Republic of Korea
| | - Yong-Young Noh
- Department of Energy and Materials Engineering , Dongguk University , Seoul 04620 , Republic of Korea
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