RSC Advances
·
2021
·Vol. 11
·期 59
·37089-37102
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IF 3.361
Qianqian Shang,Yuzhen Fang,Xingliang Yin,Xiangjin Kong
Structure design of photocatalysts is highly desirable for taking full advantage of their abilities for H2 evolution. Herein, the highly-efficient TiO2{001}/g-C3N4 (TCN) heterostructures have been fabricated successfully via an in situ ethanol-thermal method. And the structure of g-C3N4 in the TCN heterostructures could be exfoliated from bulk g-C3N4 to nanosheets, nanocrystals and quantum dots with the increase of the synthetic temperature. Through detailed characterization, the structural evolution of g-C3N4 could be attributed to the enhanced temperature of the ethanol-thermal treatment with the shear effects of HF acid. As expected, the optimal TCN-2 heterostructure shows excellent photocatalytic H2 evolution efficiency (1.78 mmol h−1 g−1) under visible-light irradiation. Except for the formed built-in electric field, the significantly enhanced photocatalytic activity of TCN-2 could be ascribed to the enhanced crystallinity of TiO2{001} nanosheets and the formed g-C3N4 nanocrystals with large surface area, which could extend the visible light absorption, and expedite the transfer of photo-generated charge carriers further. Our work could provide guidance on designing TCN heterostructures with the desired structure for highly-efficient photocatalytic water splitting.
研究领域:
材料科学
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能源化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 10
·期 70
·42860-42873
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IF 3.119
Yue Jian,Huayang Liu,Jiaming Zhu,Yaqiong Zeng,Zuohua Liu,Chentao Hou,Shihua Pu
The anatase type cluster TiO2-{001/101} was rapidly generated by a one-step hydrothermal method. The transformation process of coral-like TiOF2 nanoparticles to cluster TiO2-{001/101} was investigated for the first time, and the sensitization between cluster TiO2-{001/101} and tetracycline hydrochloride (TCH) was also discussed. The degradation rate of TCH by cluster TiO2-{001/101} under simulated sunlight was 92.3%, and the total removal rate was 1.76 times that of P25. Besides, cluster TiO2-{001/101} settles more easily than P25 in deionized water. The study showed that cluster TiO2-{001/101} derived from coral-like TiOF2 nanoparticles had a strong adsorption effect on TCH, which was attributed to the oxygen vacancy (Ov) and {001} facets of cluster TiO2-{001/101}. The strong adsorption effect promoted the sensitization between cluster TiO2-{001/101} and TCH, and widened the visible light absorption range of cluster TiO2-{001/101}. In addition, the fluorescence emission spectrum showed that cluster TiO2-{001/101} had a lower luminous intensity, which was attributed to the heterojunction formed by {001} facets and {101} facets that reduces the recombination rate of carriers. It should be noted that cluster TiO2-{001/101} still has good degradation performance for TCH after five cycles of degradation. This study provides a new idea for the synthesis of cluster TiO2-{001/101} with high photocatalytic performance for the treatment of TCH wastewater.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kai Li,Zihang Zhang,Chenxi Sun,Weiguang Han,Mengmeng Zhen,Huiling Liu
Anatase titanium dioxide (TiO 2 ) has garnered significant attention as an anode material for sodium-ion batteries (SIBs) due to its high crystallinity and two-dimensional (2D) diffusion pathways. However, its semiconducting nature results in poor electrical conductivity and sluggish Na⁺ diffusion kinetics. To address these limitations, we propose a novel strategy that integrates the highly exposed TiO 2 (001) facet with Ti 3 C 2 T x MXenes, resulting in the formation of a heterostructure denoted as ((001)T-MX). This heterostructure leverages the strengths of both components to mitigate the shortcomings of TiO 2 alone. The highly exposed TiO 2 (001) facet exhibits a lower Na⁺ insertion energy barrier compared to the TiO 2 (101) facet, thereby facilitating enhanced Na⁺ diffusion along the (001) direction. The incorporation of MXenes not only reduces the band gap energy but also significantly improves the electron conductivity, addressing the inherent conductivity issues of TiO 2 . As an SIB anode, the (001)T-MX delivers a high specific capacity of 121.3 mAh g −1 at 0.5 A g −1 after 500 cycles and exhibits superior cycling stability with a specific capacity of 99.1 mAh g −1 after 1000 cycles at 1.0 A g −1 . This work provides a robust framework for developing advanced heterostructures with tailored crystal faces, paving the way for enhanced energy storage solutions.
研究领域:
材料科学
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储能技术
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纳米技术
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电化学
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电池技术
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2018
·
IF 3.886
Yunfeng Bao,Chunlei Huang,Limin Chen,Yu dong Zhang,Long Liang,Jinjun Wen,Mingli Fu,Junliang Wu,Daiqi Ye
Anatase TiO 2 nanosheets (-ns-) with dominant exposed {001} facets were used as support to load copper, and the synthesized Cu/TiO 2 -ns catalysts were evaluated for CO 2 hydrogenation to methanol. Under the reaction conditions, P = 3.0 MPa, T = 260 °C, V (N 2 ): V (H 2 ): V (CO 2 ) = 8:69:23 and gas hourly space velocity (GHSV) = 3600 mL g −1 h −1 , the methanol yield reached an appealing high value, 5.6%. Copper-loading amount, calcination temperature and reduction atmosphere have been investigated in this work, which significantly influence the particle sizes of copper and/or the defect concentration in TiO 2 , then leading to different catalytic performance. Characterizations of XRD, EPR, CO 2 -TPD and FTIR demonstrate that higher specific surface area of Cu is good for the hydrogenation of CO 2 and adequate amount of Ti 3+ plays important roles in CO 2 activation. Both of them facilitate high turnover frequency (TOF) of methanol formation.
研究领域:
催化化学
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能源化学
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材料科学
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环境科学
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工业催化
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表面科学
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纳米材料
✓ 已验证
DOI
高影响因子
ACS Catalysis
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2022
·
IF 13.7
Cong Fu,Fei Li,Jianlong Yang,Jijia Xie,Yunshang Zhang,Xiao Sun,Xusheng Zheng,Yuanxu Liu,Junfa Zhu,Junwang Tang,Xue-Qing Gong,Weixin Huang
Photocatalytic methane combustion is a promising strategy to eliminate methane at ambient condition, but efficient photocatalysts are still lacking. Herein, we report that uniform anatase TiO2 nanocrystals predominantly enclosed with the {001} facets exhibit high activity in photocatalytic catalyzing methane combustion at RT in a flow-bed reactor. The photocatalytic methane reaction rate is 17.6 mmolCH4·h–1·gcatalyst–1, which is about 6 and 7 times of those catalyzed by TiO2 nanocrystals predominantly enclosed with the {100} facets or with the {101} facets. The valence band maximum and conduction band minimum were found to locate space-separately for TiO2-{001} nanocrystals terminated with the reconstructed (001)-(1 × 4) surface, at the surface and in the bulk, respectively. Meanwhile, the HOMO of methane adsorbed at the 4-fold-coordinated Ti4c site of reconstructed TiO2(001)-(1 × 4) surface is located at the valence band maximum of TiO2. Upon UV light illumination, TiO2-{001} nanocrystals exhibit spontaneous bulk-surface charge separation of photoexcited holes and electrons, leading to large concentrations of photoexcited holes on the surface, and subsequent facile interfacial hole transfer from TiO2(001) surface to adsorbed methane, leading to efficient methane combustion reaction.
研究领域:
光催化
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材料科学
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环境化学
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纳米材料
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表面科学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Chentao Hou,Huayang Liu,Mohammad Fahim Bakhtari
In order to solve the problem of tetracycline hydrochloride (TCH) wastewater pollution, a photocatalyst for the efficient utilization of sunlight was proposed. In this work, a new method for the synthesis of three-dimensional flower-like Ag/TiO 2 -{001}/HTiOF 3 photocatalyst was applied, where surface oxygen vacancies can induce Ag nanoparticles (NPs) to disperse on the surface of the photocatalyst, which avoids the aggregation of Ag NPs into large particles. The appropriate mesoporous structure of the photocatalyst makes TCH have a stronger affinity on its surface, which is more conducive to the subsequent photodegradation . Furthermore, the surface plasmon resonance (SPR) of Ag NPs extends the response region of photocatalyst to visible light, and the heterojunction formed with TiO 2 /HTiOF 3 further stimulates the electrons in the oxygen vacancy region and inhibits the recombination of carriers. 10-Ag/TiO 2 /HTiOF 3 showed the best degradation activity (96%) for TCH when the ratio of Ag and TiO 2 -{001}/HTiOF 3 was 10%. In addition, the Ag/TiO 2 -{001}/HTiOF 3 photocatalyst has excellent photocatalytic activity , structural stability and sedimentation performance. The prepared catalyst has practical application prospect.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 24
·8516-8524
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IF 5.287
Lei Huang,Kaiwen Zha,Supawadee Namuangruk,Anchalee Junkaew,Xin Zhao,Hongrui Li,Liyi Shi,Dengsong Zhang
Surface engineering of TiO2 is significant in the SCR reaction and worth studying. In a previous study, we found that TiO2 nanosheets (TiO2-NS) with the (001) plane exhibited a much better SCR performance than TiO2 nanoparticles (TiO2-NP) with the (101) plane. In this work, in situ DRIFTS and DFT calculations were applied to address the promotional effect of the (001) plane of TiO2-NS in the SCR reaction. The behavior of adsorption and desorption of NOx and NH3 on the two surfaces was studied. It was found that NH3 adsorbed on both TiO2-NS and TiO2-NP was in the form of NH3(g) on the Lewis acid sites. NOx on TiO2-NP were mainly trans-(NO)2 and N2O4 which were non-reactive. Differently, NO on TiO2-NS was mainly in the form of NO2 which was probably due to the high energy and abundant active oxygen species of the (001) facet. The formed NO2 could trigger the subsequent ‘fast SCR’ reaction thereafter promoting the activity. Therefore, TiO2-NS with more (001) facets had better SCR activity than TiO2-NP with the exposed (101) facet.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·Vol. 12
·期 3
·112578
·
IF 7.4
Zhao Zheng,Cheng Zhang,Junchen Li,Yan Zhao,Dingli Fang,Ao Han,Peng Tan,Qingyan Fang,Gang Chen
The removal of indoor formaldehyde (HCHO) is crucial for human health. The design of highly catalytically active nonprecious metal catalysts has major challenges, and the use of transition metal element modification to improve the catalytic performance is an effective strategy. In this study, the active component Mn was loaded on highly active crystalline anatase TiO 2 {001}, and the effect of the calcination temperature on the catalytic activity was investigated. The important influence of temperature on the catalyst valence distribution, surface active oxygen species, and content was thoroughly determined by characterization techniques, such as XPS , H 2 -TPR, and O 2 -TPD. The catalytic reaction process was further analyzed by in situ infrared technology to determine the reaction intermediates and to clarify the catalyst reaction poisoning mechanism; additionally, a reasonable HCHO catalytic reaction pathway was proposed with the combination of density function theory calculations. In addition, oxygen defects on the catalyst surface were determined by EPR , and based on theoretical calculations, the oxygen defects could further reduce the reaction energy barrier through the Langmuir-Hinshelwood mechanism. By exposing specific crystal surfaces and increasing the number of oxygen defects, the catalytic activity could be effectively improved; based on these results, our study provides a concept for the subsequent development of nonprecious metal catalysts.
研究领域:
催化化学
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环境化学
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材料科学
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表面科学
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纳米材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanfei Lu,Lianqing Chen,Chengjiang Zhang,Mengxue Yu,Kangle Lv,Xianghong Li,Benjun Xi
The development of photocatalytic nano-purifiers with high electrons and holes separation efficiency and high-photocatalytic activity is essential in treating water and air pollution. In this paper, novel nano-purifiers with S-scheme faceted heterojunction created between BiOCl nanosheets (110) facets and TiO 2 hollow nanocubes (001) facets were successfully fabricated. In nano-purifiers, BiOCl nanosheets are enriched with oxygen vacancies capable of trapping electrons, which synergize with the unique S-scheme faceted heterojunction charge transfer mechanism to facilitate carrier separation and migration to a large extent. Herein, BiOCl(110) nanosheets/TiO 2 (001) hollow nanocubes nano-purifiers (BTHNs) were significantly enhanced in photocatalytic treatment of water and air pollution and were not inferior to other cleaning agents. The obtained 15BTHNs showed the best photocatalytic purification ability among the same series of products. 15BTHNs could degrade 99.9% of RhB in 70 min, which was 25 times higher than that of pure THNs, and effectively removed 44.8% of NO. Moreover, the reduction rate of Cr (Ⅵ) for 15BTHNs reached 99.9% in 90 min, with a kinetic constant 21.5 times higher than that of pure THNs. Active species trapping experiments revealed that four active species of BTHNs contributed to the RhB oxidation reaction in the following order:·OH>h + >·O 2 - >e - , and the contribution rates of 15BTHNs were 45.0%, 38.0%, 12.3%, and 4.7%, respectively. The appropriate ratios of oxidizing TiO 2 to reducing BiOCl in 15BTHNs allowed the generated active species to be fully utilized, achieving oxidation-reduction equilibrium as well as improving the photocatalytic efficiency. This work reveals that the S-scheme faceted heterojunction formed in the BiOCl/TiO 2 nano-purifier was a progressing approach for water and air cleaning.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）