Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 28
·6806-6815
·
IF 5.066
Xufeng Dong,Chenguang Niu,Min Qi
As a composite, the particle/matrix interface may play an important role in the electrorheological (ER) performance of ER elastomers, which has been overlooked in previous studies. In this study, TiO2 particles and silicon rubber were used to prepare ER elastomers. To improve the interfacial bond strength, two coupling agents, 3-(trimethoxysilyl)propyl methacrylate (A174) and triethoxyvinylsilane (VTEO), were used to modify the surface of the TiO2 particles. Particle characterization results illustrate that the coupling agent modified TiO2 particles present little change in morphology but an increase in size with respect to the bare TiO2 particles. Compared with the bare TiO2 particle filled sample, the modified TiO2 particle filled elastomers present bridging structures between the particles and the matrix, enhanced mechanical properties, and a higher dielectric constant, indicating enhanced interfacial bond strength. The viscoelastic properties of the bare and the modified TiO2 particle filled elastomers were tested and compared. The results indicated that the ER performance, including the field-induced storage modulus and the storage modulus sensitivity, can be promoted by improving the bond strength between the TiO2 particles and the silicon rubber.
研究领域:
材料科学
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复合材料
·
界面工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Shuo Li,Jinyan Xiong,Mengjie Lu,Weijie Li,Gang Cheng
In terms of the traditional thermal transformation of TiO2 from protonic titanate, herein, we study the impact of the fabrication method of protonic titanate on photocatalytic hydrogen evolution of the derived TiO2 nanostructure. Present synthesis of TiO2 nanostructures involves the structure engineering of protonic titanate with four different synthesis strategies and a subsequent calcination process for conversion of TiO2 nanoflakes (hollow structure), nanorods, nanowires, and nanoflowers. Indeed, the TiO2 nanoflakes exhibit the highest H2 evolution rate of 3.63 mmol·g–1·h–1 among the four different TiO2 photocatalysts. With involvement of 3 wt % Pt, the corresponding H2 production rate of the TiO2 nanoflakes increases to 22.55 mmol·g–1·h–1, which is 3.18, 5.68, and 2.01 times higher than that of nanorods, nanowires, and nanoflowers, respectively. The band structure and photo/electrochemical analysis results propose that the negative conduction band position, fast photoinduced charge carrier separation, and abundant active sites contribute to excellent photocatalytic hydrogen evolution upon the TiO2 nanoflakes.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Qiuyan Tan,Kaining Li,Qing Li,Yaobin Ding,Jiajie Fan,Zhihua Xu,Kangle Lv
TiO 2 nanosheet is a fruitful paradigm for a wide variety of photocatalytic applications due to its characteristics of high photoactivity, robust stability, and environmental friendliness. However, its pragmatic utilization for visible light photocatalytic energy conversion still remains challenging owing to the wide bandgap. Herein, a 2D/3D TiO 2 /ZnIn 2 S 4 nanostructure was purposively constructed via a microwave-assisted synthesis, with ZnIn 2 S 4 functioned as a photosensitizer to overcome the lack of visible light response capacity for TiO 2 . The optimal TiO 2 /ZnIn 2 S 4 sample exhibits an excellent photocatalytic H 2 evolution activity with a rate of 1167.38 μmol/g/h under visible light illumination, far beyond that of pristine TiO 2 nanosheet (6.78 μmol/g/h) and ZnIn 2 S 4 (378.51 μmol/g/h). The enhanced photocatalytic performance can be attributed to synergy effects of the extended visible light response, compatible band alignment, and fast charge carrier separation. The in situ irradiated X-ray photoelectron spectroscopy (XPS) was used to systematically study the transfer behavior of photo-induced electrons; the results highlighted that the flow direction of photoexcited charges is from ZnIn 2 S 4 to TiO 2 nanosheets due to the strong interfacial contact. Then both ZnIn 2 S 4 and TiO 2 nanosheets can act as the active sites for proton reduction, which therefore boosts the hydrogen production under visible irradiation. This work opens a new venue for the development of flexible photosensitization systems for solar-driven energy conversion.
研究领域:
材料科学
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能源转换
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jiale Shen,Danyun Xu,Jian Ji,Qicheng Zhang,Xiaobin Fan
Sodium borohydride (NaBH 4 ) has been proposed to be a realizable hydrogen supplier for proton-exchange membrane fuel cell. Cobalt boride (CoB) is one of the most promising non-precious metal-based catalysts toward NaBH 4 hydrolysis. In this work, we develop a facile method to synthesize defects-rich TiO 2 supported CoB nanoparticles (CoB/TiO 2- x ). In this CoB/TiO 2- x , an electronic metal-support interaction is induced by transferring electrons from the defective TiO 2 to CoB to form electron-rich CoB particles, facilitating the hydrolysis of NaBH 4 . The as-synthesized CoB/TiO 2- x catalyst shows a good catalytic performance with hydrogen generation rate of 3070 mL min −1 g Co −1 and activation energy of 57.03 kJ mol −1 .
研究领域:
材料科学
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催化化学
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DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 20
·e202300434
·
IF 2.1
Lixin Zhang,Chumin Yan,Xiaoli Dong,Yu Wang,Nan Zheng,Hongchao Ma,Xiufang Zhang
Graphical In this work, the photocatalytic activity of TiO 2 with narrow band gap was successfully improved by a simple solvothermal method. Under visible-light illumination, TiO 2 sample after solvothermal treatment at 180 °C for 24 h (defined as TiO 2 -180-24) can be excited to produce photogenerated electrons and holes. Part of the electrons from the CB move to the catalyst surface and react with dissolved O 2 in solution to form ⋅O 2 − for the degradation of tetracycline (TC). Meanwhile, part of the holes from VB can also move to the catalyst surface and be directly used for the degradation of TC. In addition, the VB potential of TiO 2 -180-24 (E VB =0.56 V vs. NHE) is less positive than the oxidation potential of ⋅OH/OH − (2.38 V vs. NHE), indicating that photogenerated holes cannot oxidize OH − to generate ⋅OH. However, the results of radical capture experiments and ESR measurements indicated the presence of ⋅OH during photocatalytic degradation. Therefore, the further reduction of ⋅O 2 − can be considered as the source of ⋅OH in the photocatalytic degradation process. The generated ⋅O 2 − and ⋅OH together with h + as strong oxidants can react with TC, and finally oxidize TC into small molecular compounds such as CO 2 and H 2 O. Photocatalytic degradation of organic pollutants driven by visible-light is considered as a promising and effective water purification strategy. In this work, solvothermal treatment was carried out on visible-light-responsive TiO 2 samples in isopropyl alcohol to improve the photocatalytic degradation performance. The effects of solvothermal treatment on the microstructure, band structure, optical properties, photoelectrochemical properties and photocatalytic activity of the obtained TiO 2 samples were systematically investigated. The experimental results showed that the photocatalytic degradation performance of the treated TiO 2 samples was significantly improved. The TiO 2 sample treated for 24 h at 180 °C showed the optimal kinetic constant of photocatalytic degradation of tetracycline, which is 4.7 times that of pristine TiO 2 . This work provides some insight into the effect of solvothermal treatment on the photocatalytic properties of semiconductor photocatalysts.
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
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Fangxu Lu,Song Wen,Jie Jiang,Jinchong Zhao,Changsheng Zhang,Junjie Feng,Jing Zhang,Bing Sun,Wei Xu
It is generally acknowledged that the crystal structure of the support plays a crucial role in the catalytic performance, however, the exact role of crystal structure in the catalytic system remains controversial. The Pd/TiO2 catalysts designed in this study with different crystals (rutile (r) and anatase (a)) were employed to study the effects of the crystal structure via a probe reaction for oxygen removal under a hydrogen atmosphere. Under the same reaction conditions, the temperature to achieve 90% O2 conversion on Pd/a-TiO2 could reach up to 150 °C, which is ∼1.4 times (107 °C) that of the Pd/r-TiO2 catalyst. Based on the various characterization results, it is found that strong metal support interactions (SMSIs) are dominant on the Pd/r-TiO2 catalyst, which could facilitate the formation of oxygen vacancies and Pd2+ species in the active sites, resulting in excellent catalytic performance. This study not only improves the understanding of the distinctive structural properties of TiO2 crystal support but also offers an effective strategy to design efficient heterogeneous catalysts via tuning SMSIs.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Chemosensors
·
2025
·Vol. 13
·期 2
·45
·
IF 3.7
Wenhao Li,Bo Zhang,Xiangrui Dong,Qi Lu,Hao Shen,Yi Ni,Yuechen Liu,Haitao Song
In this work, WO3/TiO2core–shell (C-S) nanowires (NWs) were successfully synthesized by the coaxial electrospinning method and subsequent high-temperature calcination treatment. After some microscopic structural characterizations, although the prepared WO3–TiO2and TiO2–WO3C-S NWs displayed quite different surface morphologies, both of the shell coatings were uniform and their typical shell thicknesses were extremely close, with mean values of 22 and 20 nm, respectively. In gas sensing tests, WO3/TiO2C-S NWs exhibited good selectivity towards triethylamine (TEA) without significant interfering gases. Compared with bare WO3and TiO2NWs, WO3/TiO2C-S NWs showed better gas sensing performance. Specifically, the optimal operating temperature and response of TiO2–WO3C-S NWs to 100 ppm TEA were 130 °C and 106, which were reduced by 70 °C and increased by 5.73 times compared to bare WO3, respectively. Obviously, the C-S nanostructures contributed to improving the gas sensing performance of materials towards TEA. Finally, some hypothetical sensing mechanisms were proposed, which were expected to have important reference significance for the design of target products applied to TEA sensing.
研究领域:
材料科学
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纳米技术
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传感器技术
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Tong Wu,Jingyao Li,Meiqi Chang,Yanhua Song,Qi Sun,Fangke Wang,Haifeng Zou,Zhan Shi
Dual functional Sm 3+ ion doped SiO 2 @TiO 2 composites were designed to investigate their luminescence properties and photocatalytic activities under ultraviolet and simulated solar light excitation, respectively. The TiO 2 :Sm 3+ nanoparticles , SiO 2 @TiO 2 :Sm 3+ nanospheres and SiO 2 @TiO 2 :Sm 3+ nanorods were successfully fabricated via the solvothermal method followed by the calcination at 700, 800 and 900 °C, respectively. The effects of morphology and calcination temperature on photocatalytic activities and luminescent properties were studied. The results demonstrated that the SiO 2 @TiO 2 :Sm 3+ nanorods calcined at 700 °C exhibited the highest luminescence intensities. This was attributed to possess the least specific surface area, which decreased the quenching center of surface defects , as well as without rutile phase. Moreover, SiO 2 @TiO 2 :Sm 3+ nanorods annealed at 800 °C were the optimum for improving the photodegradation efficiency of hydrolyzed polyacrylamide (HPAM) under simulated solar light irradiation. The degradation experiments results confirmed that the synergistic effect of the crystallinity/Ti–O–Si bond was the main reason for excellent photocatalytic activities. As a result, SiO 2 @TiO 2 :Sm 3+ nanorods meet our requirements for better photoluminescence intensities and photocatalytic activities.
研究领域:
材料科学
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光学
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环境科学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 50
·31619-31627
·
IF 3.108
Yingqiao Xiang,Yingying Li,Xintong Zhang,Annan Zhou,Nan Jing,Qinghong Xu
A series of CuxO–TiO2 hollow nanospherical composites with different mass percents of copper were prepared by an impregnation method, and the TiO2 hollow nanospheres were prepared by hydrolysis of tetraethoxy titanium on the surface of spherical SiO2 nanoparticles and corrosion of SiO2 in NaOH solution. CuxO–TiO2 hollow nanospheres displayed higher photocatalytic activities towards acetaldehyde degradation to CO2 than TiO2@SiO2 nanospheres and TiO2 hollow nanospheres under UV and visible-light irradiation due to the narrowed band gap of TiO2 and enhanced charge separation after copper was introduced. In particular, the CuxO–TiO2 hollow nanospheres show high catalytic activities in degradation under visible-light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Binbin Jin,Xin Ye,Heng Zhong,Fangming Jin
Efficient conversion of CO2/bicarbonate into chemicals using solar energy as driving force is meaningful to alleviate global warming caused by excessive CO2 emission. In this work, a direct light-driven method of bicarbonate hydrogenation into formate over a nanocatalyst Pd/TiO2 is proposed. Formic acid has recently attracted increasing attention as a promising hydrogen storage carrier. By using the Pd/TiO2, the reaction system achieved a self-heating effect under irradiation, promoting the hydrogenation of bicarbonate. Owing to its extraordinary photothermal conversion ability and efficient light utilization, the 5 wt % Pd/TiO2 exhibited a high photothermal conversion efficiency of 30.9% under experimental illumination. The desirable performance of the Pd/TiO2 catalyst for hydrogenation of bicarbonate is attributed to the elevated temperature from the localized surface plasmon resonance effect of nano-Pd and the direct participation of photogenerated carriers in hydrogenation of bicarbonate. This study combined the merits of photocatalysis and thermocatalysis, providing a promising method for light-driven conversion of CO2 using the photothermal synergistic effect.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 18
·4477
·
IF 4.2
Fuhua Wei,Qin Zhang,Qinhui Ren,Hongliang Chen,Yutao Zhang,Zhao Liang
The Zn/Cr-MOFs/TiO2composites were synthesized using the solvothermal method. XRD, FTIR, and SEM techniques were utilized to characterize the Zn/Cr-MOFs/TiO2composites employed for simulating levofloxacin hydrochloride in wastewater. The impact of the mass of the Zn/Cr-MOFs/TiO2composite, concentration of levofloxacin hydrochloride, solution pH, and temperature on the adsorption performance was investigated. Experimental findings indicated that at pH 6, the maximum removal efficiency of levofloxacin hydrochloride by the Zn/Cr-MOFs/TiO2composite was achieved at 88.8%, with an adsorption capacity of 246.3 mg/g. To analyze the experimental data, both pseudo-first-order and pseudo-second-order kinetics models were applied, revealing that the pseudo-second-order model provided a better fit to the data. Additionally, Langmuir and Freundlich isotherm models were used to study equilibrium adsorption behavior and showed good agreement with both kinetic modeling and Langmuir isotherm analysis results. These observations suggest that monolayer adsorption predominates during the removal process of levofloxacin hydrochloride by Zn/Cr-MOFs/TiO2composites.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
POLYMERS & POLYMER COMPOSITES
·
2021
·
IF 2
Hailiang Hu,Minmin Chen,Mengye Cao
The eco-friendly functionalized TiO2/polymer antifouling (AF) coating was successfully synthesized by dispersing TiO2 nanoparticles in waterborne epoxy-modified tung oil resin. The AF effectiveness of coating was evaluated toward Staphylococcus aureus (S. aureus, ATCC6538), Escherichia coli (E. coli, ATCC8739) and diatom (Cyclotella sp., FACHB-1635). The nanoTiO2/polymer AF coating showed good antimicrobial activity both under the light and dark conditions by comparison with the pristine TiO2 nanoparticles and bulk polymer. Under light irradiation for 50 min, the AF coating showed only 8.4% and 8% survival rate for S. aureus and E. coli. In addition, The AF coatings exhibited favorable inhibition efficacy toward the growth and adhesion of Cyclotella sp., and the efficacy was enhanced with the increase of TiO2 content. It can be concluded that TiO2 nanoparticles endow the AF coatings with promoted fouling resistance properties.
研究领域:
材料科学
·
微生物学
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DOI
高影响因子
危险品化学品经营许可证（带存储）