MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Seseg Damdinova,Wencong Liu,Shang Wang,Bato Dugarov,Zongmin Su,Zhiqiang Cheng
In this work, TiO 2 nanofibers were prepared by combining electrospinning with an impregnation calcination technique. Ag 2 MoO 4 nanoparticles at various concentrations were successfully deposited onto the surface of the nanofibers by hydrothermal synthesis method . Photocatalytic activities of samples for methyl orange degradation were investigated. The results indicate that Ag 2 MoO 4 –TiO 2 nanofibers could efficiently degrade methyl orange upon the irradiation with UV-light, showing a greater photocatalytic activity than the pure titanium dioxide.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Xuefeng Yan,Yin Xu,Baozhu Tian,Juying Lei,Jinlong Zhang,Lingzhi Wang
The utilization of the fingerprint spectrum for the operando monitoring of a photocatalytic process is extremely desired to accurately understand the reaction mechanism but long remains challenging. Here, ordered macroporous TiO 2 that is concomitantly photocatalytically active and high surface-enhanced Raman scattering (SERS) sensitive was unprecedentedly employed to self-track the photocatalytic reaction using the oxidation of p -aminothiophenol (PATP) as the model. The photocatalytic degradation under 532 nm laser irradiation initiated from the formation of the azo compound was explicitly revealed by finely resolved SERS spectra. More importantly, the decomposition rates of different bonds including N N, C S and C C were respectively determined, following a first-order kinetics process with the rates in the range of 2.1–2.7 × 10 −3 s −1 . Meanwhile, this self-monitoring strategy also provides an opportunity for gaining an insight into the effect of photothermal catalysis on selective formation of the azo compound.
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DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Yunfeng Wu,Yu Zang,Liang Xu,Jianjun Wang,Hongge Jia,Fengjuan Miao
High-performance conjugated microporous polymer (CMP)/TiO 2 photocatalytic antibacterial nanocomposites were successfully synthesized by in situ Sonogashira polymerization. TiO 2 was uniformly dispersed onto the surface and within the CMP which show the microporous nature with narrow pore size distribution. The high crystallinity and thermal stability of the CMP/TiO 2 nanocomposites are attractive for use as antibacterial materials. The composites we prepared showed excellent photocatalytic antibacterial properties for the inactivation of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) under visible light irradiation. The photocatalytic antibacterial rates of nanocomposites against E. coli and S. aureus after 120 min of visible light irradiation were 98.14% and 100%, respectively. The superoxide anion ( O 2 − ) was confirmed to be an important substance in the antibacterial process above. The cytocompatibility of the antibacterial agents was studied in terms of cytotoxicity against NIH 3T3 fibroblasts. More than 95% of the cells were still alive in the presence of the nanocomposites, both without and with light irradiation, indicating the good cytocompatibility of the nanocomposites. Judging from the excellent photocatalytic antibacterial properties and ultralow toxicity of nanocomposites, these materials can be used in many fields such as medical treatment, transportation and construction.
研究领域:
材料科学
·
纳米医学
·
生物材料
·
光催化
·
抗菌治疗
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lei Wang,Xudong Liu,Mu Zhang,Xiaoguo Bi,Zhixin Ma,Jinsheng Li,Jialin Chen,Xudong Sun
(Nb 0.5 Ga 0.5 ) x Ti 1−x O 2 (x = 0.05%,0.2%,0.5%,1%,5%) single crystals were prepared by Verneuil method. Even if the doping amount is 0.05%, the dielectric permittivity (ε′) is obviously higher than that of pure rutile TiO 2 (260), reaching more than 10 4 . As the doping amount x increase, the ε′ increases, and reaches the maximum value when x = 5%, but the dielectric loss increases correspondingly. The best dielectric performance (ε′=1.0 ×10 5 , tanδ=0.034 under 1 kHz) is obtained when the doping amount is 0.5%. Even at 10 6 Hz, the dielectric loss is only 0.019, much lower than the reported ceramic samples. This may be due to the fact crystalline materials can effectively reduce defects such as grain boundary, second phase, porosity and segregation. The dielectric spectra, impedance analysis, XPS and DC bias results show that the colossal permittivity (CP) properties could be attributed to EPDD polarization. With the increase of doping concentration (>1%), the hopping polarization occurs, resulting in a slight increase in dielectric loss. These results indicate that TiO 2 crystal materials with lower dielectric loss are good candidates for dielectric materials. Taking TiO 2 crystal as the research object, we can have a clearer understanding of the origin of TiO 2 dielectric properties and the influence of doping ion content, which is of great significance to the development of TiO 2 -based dielectric materials.
研究领域:
材料科学
·
介电材料
·
晶体生长
·
固体物理
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Liuyang Yang,Zhichun Si,Duan Weng,Youwei Yao
Porous WO 3 /TiO 2 hollow microspheres were prepared by a spray drying method for photodegradation of methylene blue and phenol . The catalysts were characterized by X-ray diffraction, Field Emission Scanning Electron Microscope , High Resolution Transmission Electron Microscope , N 2 adsorption–desorption measurements, Raman spectrometer, UV–Vis Diffuse Reflectance Spectroscopy and Zeta-Meter measurements. The results showed that the tungsten oxides mainly existed in highly dispersed amorphous form on anatase when the loading amount of tungsten oxide was below 3 mol%. The improved photocatalytic activity under UV light irradiation of the WO 3 /TiO 2 catalyst mainly arises from the enhanced charge separation efficiency rather than the improved light absorbance by highly dispersed amorphous tungsten oxides. Highly dispersed amorphous WO x can form a shallowly trapped site due to its similar band structure with TiO 2 . The strongly electron-withdrawing of tungsten oxide in highly dispersed state facilitates the electron transition between titanium and WO x , and consequently improves the charge separation. The enhanced acidity of catalyst by WO x in reactant environment also improved the charge separation efficiency due to the timely transition of holes and electrons accumulated on TiO 2 and WO x , respectively. However, the improved photocatalytic activity under visible light irradiation of the WO 3 /TiO 2 catalyst mainly arises from light harvest. TiO 2 containing 3 mol% WO 3 displayed the highest photocatalytic activity under UV light irradiation while that containing 4 mol% WO 3 present highest activity under visible light irradiation.
研究领域:
材料科学
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光催化
·
环境化学
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纳米材料
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无机合成
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qi Yan,Shuyao Li,Xinglin Tao,Tao Wang,Xiyan Xu,Xingling Wang,Hexing Li,Xiangyu Chen,Zhenfeng Bian
With the rapid development of triboelectric nanogenerators (TENGs) for flexible wearable devices and electronic skins, challenges have gradually emerged related to the electrification surface, such as pollutant contamination and sophisticated surface adaptability. Hence, we report a simple spraying method to produce a shape-adaptive photocatalytic (SAP) triboelectric material with both self-cleaning and shape-adaptive functions. By spraying the polyvinyl alcohol solution with TiO2 photocatalysts and pre-drying cyclic, the SAP film can be adapted to a varied and intricate substrate. The highest transferred charge density of the SAP film reaches 197.5 μC/m2, when it contacts with the PTFE film. At the same time, it can degrade 74.4% of simulated pollutants under sunlight illumination, and 97% of the transferred charge density can be maintained after the degradation process, indicating good self-cleaning function and stable electrical output. Moreover, the spraying method of this allows it to have shape-adaptive functions. Accordingly, the SAP film can be deposited on the rectangular pyramid and hemispherical surface for fabricating TENGs with special shapes. This low-cost and simple spraying method further promotes the commercialized application of TENGs in the field of wearable devices and skin sensors.
研究领域:
纳米技术
·
能量收集
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材料科学
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可穿戴电子学
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环境功能材料
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DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 37
·期 6
·1105-1113
·
IF 1.6
Tang Hailong,Wang Min,Ju Tangtong,Dai Yue,Wang Meiling,Ma Yongqing,Zheng Ganhong
TiO 2 /graphene composite was synthesized in the vapor environment of isopropanol. In order to improve the properties of composite, N-doped of TiO 2 /graphene with different N/Ti molar ratio was prepared in the vapor environment of deionized water and used urea as the source of nitrogen. The N-doped occupies in the interstitial sites of TiO 2 lattice, substitutes for O element in TiO 2 and for C element in graphene, and simultaneously changes the chemical states of Ti and O elements in TiO 2 . N-doped changes the morphology of TiO 2 from nano-sheets to nanoparticles, accompanying with the decrease in specific surface area of the composites, first increases the particle size of TiO 2 and then decreases, and alters the vibration modes of Ti-O-Ti. The composite with R N/Ti =2 exhibits the enhanced photocatalytic degradation performance to methylene blue, and the degradation rate increases from 7.7×10 −2 min −1 for the undoped composite to 9.6×10 −2 min −1 .
研究领域:
材料科学
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纳米技术
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光催化
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复合材料
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环境工程
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 86
·期 12
·3133-3152
·
IF 2.43
Liu Gen,Lin Yingzi,Li Siwen,Shi Chunyan,Zhang Daihua
Hierarchical porous TiO 2 photocatalytic nanomaterials were fabricated by impregnation and calcination using a peanut shell biotemplate, and TiO 2 /BiFeO 3 composite nanomaterials with different doping amounts were fabricated using hydrothermal synthesis. The micromorphology, structure, element composition and valence state of the photocatalyst were analyzed using a series of characterization methods, including X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), BET surface area (BET), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance (UV-vis), fluorescence spectroscopy (PL) and other technological means. Finally, the degradation mechanism and efficiency of BiFeO 3 composite photocatalyst on the target pollutant triclosan were analyzed using a xenon lamp to simulate sunlight. The results showed that TiO 2 /BiFeO 3 catalyst fabricated using a peanut shell biotemplate has a specific surface area of 153.64 m 2 /g, a band gap of 1.92 eV, and forms heterostructures. The optimum doping amount of TiO 2 /BiFeO 3 catalyst was 1 mol/mol, and the degradation rate was 81.2%. The main active substances degraded were ·O 2 − and ·OH. The degradation process measured is consistent with the pseudo-first-order kinetic model. TiO 2 loading can increase the specific surface area and empty volume of BiFeO 3 and provide more active sites. Through total organic carbon analysis, the mineralization rate of total organic carbon of TiO 2 /BiFeO 3 photocatalyst is 58.9%. h+ and ·OH are the active substances for degradation of triclosan. Relatively speaking, · OH has more obvious inhibition on triclosan and is the main active oxidizing substance.
研究领域:
环境科学
·
材料科学
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光催化
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纳米材料
·
污染物降解
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DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 45
·24644-24650
·
IF 11.9
Dongrun Xu,Weiye Qu,Junhong Liu,Junxiao Chen,Xue Fang,Liwei Chen,Zhen Ma,Xi Liu,Xingfu Tang,Yaxin Chen
Selective catalytic reduction (SCR) is the most effective technology to control NO emission using commercial V2O5–WO3/TiO2 catalysts, but the nature of active catalytic sites remains under debate. Here we provide evidence demonstrating that dinuclear vanadium–tungsten sites are the most active catalytic sites of conventional V2O5–WO3/TiO2 catalysts, inconsistent with a prevailing view that dimeric vanadium sites are the active sites. The dinuclear vanadium–tungsten sites have inherently stronger acidity than the dimeric vanadium sites, favoring NH3 adsorption. Meanwhile, the vanadium 3d electrons of the dinuclear vanadium–tungsten sites are richer than those of the dimeric vanadium sites, facilitating O2 activation in SCR. Hence, the dinuclear vanadium–tungsten sites have higher SCR activity than the dimeric vanadium sites under identical reaction conditions. This work settles a long dispute on the identification of active sites of conventional V2O5–WO3/TiO2 SCR catalysts, thus having implications for a unified explanation of disparate SCR reaction mechanisms and rational design of improved SCR catalysts.
研究领域:
催化化学
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环境化学
·
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·509
·
IF 2.8
Li Chang,Fu Zhifen,Chen Chen,Cheng Qing
In this paper, Li 2 O–MgO–TiO 2 (1: x :1, x = 1, 2, 3, 4 and 5) ceramic systems were prepared by solid-state reaction sintering. The effects of extra magnesium content on the phase evolution, crystal structure and microwave dielectric characteristics of Li 2 O–MgO–TiO 2 ceramics were systematically investigated. The Li 2 MgTi 3 O 8 , Li 2 Mg 3 TiO 6 , and (Li 2 TiO 3 ) 10.667 coexisted at x = 1 and 2. When x augmented to 3, the pure Li 2 Mg 3 TiO 6 -like phase was obtained with the increase of magnesium content. All specimens showed porous structure and clear grain boundaries. The microwave dielectric characteristics are extraordinary dependent on chemical component and densification. The Li 2 O–4MgO–TiO 2 ceramics sintered at 1350 °C possessed preeminent comprehensive performance of ε r = 13.95, Q × f = 119,072 GHz and τ f = − 40.9 ppm/°C.
研究领域:
材料科学
·
陶瓷
·
微波介质
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DOI
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2017
·Vol. 2017
·期 1
·2562968
·
IF 1.277
Gang Lu,Fengqin He,Shangzheng Pang,Haifeng Yang,Dazheng Chen,Jingjing Chang,Zhenhua Lin,Jincheng Zhang,Chunfu Zhang
Organometal halide perovskite as a promising absorber in solar cells has caught tremendous attention in the past few years. Herein, a hydrophobic PCBM layer was introduced into planar heterojunction perovskite solar cells to form the TiO 2 /PCBM double blocking layer. The bilayer structure assures the formation of a dense, smooth, and pinhole-free blocking layer. And the PCBM layer can also be in favor of larger grain size perovskite film and further passivate the TiO 2 blocking layer. Scanning electron microscope, atomic force microscope, and X-ray diffraction (XRD) results suggest the formation of a uniform and compact CH 3 NH 3 PbI 3− x Cl x perovskite layer on the PCBM-modified TiO 2 blocking layer. The solar cell has reached a PCE up to 16.37%, which is greatly larger than the control device with a PCE of 10.81%.
研究领域:
光伏技术
·
材料科学
·
纳米技术
·
能源材料
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 10
·7863-7872
·
IF 3.086
Xin Li,Huiming Lin,Xiang Chen,Hao Niu,Ting Zhang,Jiuyu Liu,Fengyu Qu
TiO2/porous carbon nanofibers (TiO2/PCNFs) were prepared for visible photocatalysis for dye degradation. PCNFs were synthesized via an electrospinning technique, exhibiting a highly porous structure and large surface area. After hydrothermal treatment, TiO2 nanorods were deposited onto the PCNFs to obtain a TiO2/PCNFs heterostructure. By adjusting the amount of Ti source material, the amount of TiO2 nanorods could be easily controlled. Congo red (CR), methylene blue (MB), methyl orange (MO) and eosin red (ER) were adopted as the model dye molecules, and the adsorption and visible photocatalysis studies were carried out in depth. All of the TiO2/PCNFs exhibit an enhanced visible photocatalytic efficiency and good recyclability due to the large surface, improved visible light absorption and high separation efficiency of the photogenerated electron/hole. In particular, TiO2/PCNFs-4 possesses the ability to efficiently decolor MB solution even with a high concentration (120 mg L−1, 70 min), ascribed to the high adsorption capacity derived from the strong electrostatic interaction and structure match between TiO2/PCNFs-4 and MB. These TiO2/PCNF heterostructures exhibit the great potential for practical application to eliminate organic pollutants from wastewater.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
光催化
·
废水处理
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DOI
高影响因子
危险品化学品经营许可证（带存储）