MATERIALS RESEARCH BULLETIN
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2024
·
IF 5.3
Yuanmei Xu,Wenbing Chen,Xueshi Li
Much attention has been focused on the fabrication of TiO 2 microspheres due to their excellent properties and attractive potential in many fields. Here, undoped 3D hierarchical TiO 2 microspheres (TMS) were synthesized in situ on Ti mesh using a hydrothermal method by varying NaOH concentration, reaction time and temperature. The 3D TMS grown along the surface of the woven wires of the Ti meshes, using the metal Ti meshes as a substrate, which resulted in improved conductivity. Meanwhile, the original Ti mesh with the macroporosity (due to the 15 % open area of the mesh) can act as fast proton mass diffusion. As a result, the flexible TMS-Ti photoelectrodes exhibit an excellent current density of 1.63 mA/cm 2 at a potential of 1.23 V (vs Ag/AgCl). Therefore, the in situ synthesis of TiO 2 microspheres on Ti mesh is highly desirable for flexible devices.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
International Journal of Nanomedicine
·
2018
·
IF 4.37
Wei Luo,Zhen Geng,Zhaoyang Li,Shuilin Wu,Zhenduo Cui,Shengli Zhu,Yanqin Liang,Xianjin Yang
Background Calcium sulphate cement (CSC) is widely used as an osteoconductive biomaterial in bone repair and regeneration.Purpose In this study, porous TiO2 microspheres were added to CSC to achieve a controlled and sustained drug (gentamicin) release.Methods Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and Brunauer-Emmett-Teller (BET) surface area analysis were conducted to analyse the morphology, phase composition, and surface area of the TiO2 micro-spheres and composite cements. In addition, the injection time, compressive strength, degradation behaviour, and antibacterial ability of the composite cements were examined during in vitro degradation. Gentamicin release profile was recorded using an ultraviolet spectrophotometer.Results The results revealed the excellent drug loading ability of the TiO2 microspheres. The addition of TiO2 microspheres improved the injectability and compressive strength of the composite cements, the maximum value of which was achieved at a TiO2 loading of 5 wt.%. When immersed in simulated body fluid (SBF), the composite cements doped with TiO2 microspheres were observed to release gentamicin in a stable and sustained manner, especially in the latter stages of in vitro degradation. During degradation, CSC doped with TiO2 microspheres exhibited a typical apatite-like behaviour. Further, antibacterial analysis showed that CSC doped with TiO2 microspheres exhibited long-term antibiotic activity.Conclusion Thus, as an effective sustained-release formulation material, TiO2 microspheres show a great potential for application in bone cements.
研究领域:
生物材料学
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药剂学
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骨科医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
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IF 1.901
Jie Hu,Yi Lu,Xiao-Fang Zhao,Yu-Qian Tang,Yuan-Zhou Li,Yu-Xuan Xiao,Zhi-Yi Hu,Bao-Lian Su,Xiao-Yu Yang
TiO 2 hierarchical microsphere assembled from anatase TiO 2 nanosheets has been successfully prepared and exhibited excellent catalytic activities of H 2 production and benzyl alcohol selective oxidized to benzaldehyde. These enhanced photoactivity can be mainly ascribed to the charge separation promoted by the surface F and nanosheet units, enhancement of substrate molecular transport profited from the hierarchical structure.
研究领域:
材料科学
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光催化领域
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yahui Zhou,Xiaohua Cheng,Zijian Duan,Xin Liu,Huiyu Yang,Bo Deng
Black TiO 2 microspheres photocatalysts with high light absorption intensity and photosensitive activity were prepared by a simple two-step method of flame-assisted combustion hydrolysis of tetrabutylorthotitanate (TBOT) and NaBH 4 reduction. The black TiO 2 microspheres photocatalysts were characterized by XRD, TEM, XPS, EELS , and UV-Vis absorption spectroscopy . The results show that the reduced TiO 2 exhibits a unique core-shell composite structure with a large number of oxygen vacancies and defects in the outer layer due to Ti 3+ , which effectively reduces the band gap of the photocatalyst. Compared with the commercial P25 catalyst, B-TiO 2 (1:7) showed higher removal of carbamazepine (CBZ) under visible light and its photocatalytic activity was 1.7 times higher than that of P25. This high photocatalytic activity is due to the efficient separation of electron-hole pairs, creating a greater number of active species. B-TiO 2 (1:7) maintained high activity after five repeated cycles and achieved 89.7 % removal of CBZ.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 11
·2870
·
IF 3.623
Jian Di,Haibo Yan,Zhuoyu Liu,Xing Ding
In this paper, we report a novel and simple method for synthesizing the microspheres self-assembled from ultrathin anatase TiO2nanosheets with a high percentage of (001) facets via the hydrolysis process of the single-reagent (potassium fluorotitanate). We then used optical microscopy, scanning electron microscopy, and high-resolution confocal laser Raman spectroscopy to characterize the microspheres generated under different conditions. The study found that the size of the anatase TiO2microspheres synthesized was 0.5–3 μm. As the synthesis time increased, the corroded surface of the microspheres gradually increased, resulting in the gradual disappearance of the edges and corners of the anatase nanosheets. The exposure percentage of the (001) facets of ultrathin anatase nanosheets synthesized for 2 h at 180–200 °C are close to 100%. The microsphere whose surface is completely covered by these anatase nanosheets also has nearly 100% exposed (001) facets. This new anatase nanosheet-based self-assembled microsphere will have great application potential in pollution prevention, environmental protection, and energy fields.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Ranran Ding,Zhenhua Li,Chengyang Wang,Mingming Chen
In this work, yolk-shell MnCo 2 O 4 -TiO 2 microspheres were synthesized by a solvo-thermal method combined with a subsequent kinetic-controlled coating. The as-fabricated MnCo 2 O 4 -TiO 2 -50 composite shows remarkable electrochemical performance as an anode material for lithium-ion batteries, with a high specific capacity, superior cycle stability and excellent rate capabilities. At a current density of 100 mA g −1 , the composite exhibits a reversible specific capacity of 1271.5 mA h g −1 for up to 200 cycles, exhibiting stable cyclic performance. The outstanding electrochemical performance of MnCo 2 O 4 -TiO 2 -50 microspheres is due to its rational composition and structure. The porous yolk-shell structure buffers the volume change of the electrode material during charging/discharging, whereas the MnCo 2 O 4 core and TiO 2 shell synergistically assure stable cycling and satisfactory specific capacity.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Yan Yu,Na Zhong,Jincan Zheng,Shasha Tang,Xincheng Ye,Tao Zeng,Weiting Yu,Zhiqiao He,Shuang Song
Photoelectrocatalytic (PEC) water splitting provides an alternative to direct solar-to-fuel production. In this study, a novel heterostructure formed between a conjugated polymer [poly-2,6-diaminopyridine (PDAP)] and three-dimensional TiO 2 microspheres was grown in situ on a Ti substrate (PDAP-3DTiO 2 MSs/Ti) and used as photoanode for water oxidation in alkaline media under AM 1.5G illumination. The PDAP-3DTiO 2 MSs/Ti can produce applied bias photon-to-current efficiency of 0.85% at 0.44 V vs. Pt and a photocurrent density of 1.56 mA cm −2 at 1.23 V vs. RHE . Moreover, PDAP-3DTiO 2 MSs/Ti displays impressive photoelectrochemical stability with 93% of its initial photocurrent being retained after 4 h of reaction. Based on physical-chemical characterization and photo-/electro-chemical measurements, the superior PEC water splitting performance of PDAP-3DTiO 2 MSs/Ti should benefit from the coexistence of Ti 3+ and Ti 4+ in 3DTiO 2 MSs, the light harvest capability of PDAP and the type II heterojunction formed between 3DTiO 2 MSs and PDAP, which result in the enhanced generation and separation of photocarriers.
研究领域:
材料科学
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能源科学
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化学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2018
·Vol. 6
·期 3
·035503
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IF 1.151
Qiwei Shi,Jianxiong Liu,Jianzheng Zhen,Guanqun Zhang,Cheng Liu,Qi Cheng,Zhaolin Zhan
The precursor of Fe(OH)3, C and TiO2 was synthesized by a simple one-step hydrothermal method. Then, the of C in the composite was eliminated by calcination at 500 °C for 5 h in an air atmosphere. Thereby, a Fe2O3@TiO2 microspheres composite material is synthesized. The incorporation of Fe2O3 helps provide high specific capacity, high speed cycling and stable life performance. The first discharge capacity of Fe2O3@TiO2 microspheres is 688 mAh g−1, with higher discharge performance, higher reversible capacity and higher cycle performance. Moreover, the 2nd to 50th charge and discharge of Fe2O3@TiO2 microspheres, the capacitance retention rate exceeds 90%. The outstanding stable cycling and well rate performance suggest that Fe2O3@TiO2 microspheres have great potential to be applied as anode material for lithium ion batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 8
·3487-3492
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IF 3.288
Guopeng Chen,Guofeng Zhang,Fuchao Yang
Stimuli-responsive materials with appealing interactions can serve as key modules for smart devices and have a broad scope of application. In this study, Fe3O4@PDA@TiO2 microspheres with a core–shell structure were assembled. The hollow microspheres have a mesoporous structure and were characterized by SEM, TEM, XRD, Raman, BET, XPS, UV-vis and TGA analyses. Then, a photoresponsive coating with reversibly switchable wettability was prepared by a simple sieve-deposition method using Fe3O4@PDA@TiO2 powder. In addition, the Fe3O4@PDA@TiO2 coated fiber textile was obtained by a dipping method and was used for oil–water separation due to its underwater superoleophobicity. Finally, it was found that this material with its hollow and mesoporous structure can be used for dye adsorption, while the anatase TiO2 ingredient shows good photocatalysis performance.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2016
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IF 2.435
Honghong Liu,Hong Gong,Mingming Zou,Heng Jiang,Rasaki Sefiu Abolaji,Ayesha Khan Tareen,Branislav Viliam Hakala,Minghui Yang
Mo-N-co-doped mesoporous TiO 2 microspheres were synthesized via a solvothermal method, followed by nitriding treatment under ammonia gas flow. The efficiency of the samples was investigated by monitoring the degradation of Rhodamine-B under visible light irradiation. The experimental results revealed that Mo-N-co-doped mesoporous TiO 2 microspheres showed better performances than Mo-TiO 2 microspheres. It was observed that; 0.1% molar quantity of Mo doped on TiO 2 at 500 °C for 2 h under nitriding conditions gave highest photocatalytic activities. The nitridation under ammonia gas of Mo-TiO 2 samples created oxygen vacant sites and led to incorporation of substitutional and interstitial Nitrogen. The enhanced visible light photocatalytic activities of Mo-N-co-doped TiO 2 photocatalyst was attributed to the large surface areas, narrow band gap and intense light absorbance in visible region. This study may create a promising and eco-friendly method towards synthesis of metal and non-metals co-doped on semiconductor materials to improve their photocatalytic activities and applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2020
·
IF 8.352
Ying Zhang,Jing Gao,Xin Xin,Lihui Wang,Heyu Li,Xiaobing Zheng,Yanjun Jiang
The successful combination of enzymes and photocatalysts in one pot is an elegant approach for the reactions with high efficiency. This combination usually requires both enzymes and photocatalysts with reasonable activity under the same condition. Herein, a photo-enzyme integrated catalyst by immobilizing laccase on clustered porous TiO 2 heterophase junction (HPJs) microsphere (denoted as mTiO 2 -CVs) is synthesized for the first time. The TiO 2 microsphere with ordered regular radial structure and controllable heterophase junction (anatase/rutile) composition is prepared by a pressure-driven hydrothermal assembly method. The ratio of rutile and anatase phase of mTiO 2 -CVs can be controlled by adjusting the amount of hydrochloric acid in the preparing process. The characterization results of mTiO 2 -CVs prove that the mTiO 2 -CVs has regular morphology, uniform mesoporous structure, larger specific surface area and narrower band gap, and can realize the effective utilization of visible light. After immobilizing laccase on mTiO 2 -CVs by adsorption method, the integrated catalyst (mTiO 2 -CVs2.5@lac) can be obtained. Compared with free laccase, mTiO 2 -CVs2.5, and commercial P25, mTiO 2 -CVs2.5@lac shows higher catalytic efficiency in the emerging contaminants degradation under visible light. Therefore, the photo-enzyme integrated catalyst presented in this study provides a promising platform for emerging organic pollutants degradation by combining the enzymes with photocatalysts
研究领域:
环境科学
·
催化
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Yawen Wang,Zunli Mo,Ping Zhang,Chun Zhang,Lijuan Han,Ruibin Guo,Hao Gou,Xiaojiao Wei,Rere Hu
A surfactant-assisted hydrothermal route was developed for the synthesis of three-dimensional (3D) flower-like TiO 2 microsphere decorated graphene composite (FT/GN) based on the hydrothermal reduction of graphene oxide and formation of TiO 2 microsphere in the presence of poly(vinyl pyrrolidone) (PVP). By several characterization methods such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, we demonstrated that uniform flower-like TiO 2 (FT) microsphere with average diameter of 1.4 μm have successfully anchored on the surface of graphene sheets . Effects of PVP and reaction temperature on the microstructure of the composite were investigated. Benefits from the combined graphene with FT microsphere were that the FT/GN composite exhibited higher adsorption capacity and photocatalytic activity for the removal of rhodamin B (RhB) than blank FT microsphere and P25. Especially, the removal rate of RhB using FT/8GN composite under UV light irradiation reached 99.2% in 80 min, with corresponding TOC removal efficiency of 66.49%. Moreover, the recycled photoactivity tests showed that the prepared composite were stable enough and maintained high removal efficiency for RhB even after four cycles. It is expected that the present synthetic strategy may provide a new strategy for the fabrication of various GN-based hybrids with multi-dimensional structure.
研究领域:
环境科学
·
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）