FUEL
·
2018
·
IF 4.908
Riyang Shu,Biqin Lin,Chao Wang,Jingtao Zhang,Zhengdong Cheng,Ying Chen
Noble metal catalyst has an outstanding catalytic activity on the hydrodeoxygenation (HDO) process, but its high cost limits large-scale application. Herein, we put forward a novel photochemical method to prepare the highly dispersed Pt/TiO 2 catalyst with a low metal loading. And it presented an efficient performance on the HDO of phenolic compounds and real bio-oil. Guaiacol could be converted into cyclohexane with 95.1% selectivity at 280 °C under 1 MPa H 2 atmosphere. Characterization results revealed that the high Pt dispersion was the critical factor for the high catalytic activity. And the photochemical method preferred to achieve high metal dispersion due to the room temperature condition. Other typical phenolic monomers and dimers were able to transform into hydrocarbons with most yield above 80%, wherein not only the deoxygenation step, but also the cleavage of ether bonds can be realized in one pot. This catalytic system was also effective on the upgrade of bio-oil derived from the pyrolysis of cotton straw. Hydrocarbon content increased to 33.80% from 11.33%. Alkylphenols content increased to 51.38% from 27.86%. These two products can be used as value-added fuels and chemicals, respectively. Guaiacols and syringols were completely converted into alkylphenols and hydrocarbon. The amount of other oxygenated compounds also decreased significantly. This simple and active catalytic system is potential to apply widely for the upgrade of raw bio-oil.
研究领域:
催化化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Mao-Jin Ran,Meng Wang,Zhi-Yi Hu,Yi-Fu Huang,Lin-Dong Wang,Lu Wu,Man-Man Yuan,Jian Zhang,Bei Li,Gustaaf Van Tendeloo,Yu Li,Bao-Lian Su
Constructing heterojunctions have received significant attention in photocatalysis because of their efficient separation of photogenerated carriers and improving light utilization efficiency. Bimetallic sulfides (e.g. NiCo 2 S 4 ) are applied in electrocatalysis and supercapacitors that can be coupled with TiO 2 to form a heterojunction . Owing to the staggered energy band arrangement between TiO 2 and NiCo 2 S 4 , the establishing of a Z-scheme heterojunction between them is expected to enhance the carrier separation efficiency and reduce the sulfide photo-corrosion. However, the application of NiCo 2 S 4 in photocatalysis and studies on the mechanism of the TiO 2 /NiCo 2 S 4 Z-scheme heterojunction have seldom been reported. In this work, we obtained a hollow core-shell TiO 2 /NiCo 2 S 4 Z-scheme photocatalyst through a solvothermal method for photocatalytic hydrogen evolution (PHE). The PHE rate of the optimized TiO 2 /NiCo 2 S 4 -0.3 is 8.55 mmol g − 1 h − 1 , approximately 34 times higher than pure TiO 2 , 94 times higher than pure NiCo 2 S 4 . The remarkable photocatalytic activity can be ascribed to the hollow structure and the in-situ constructed Z-scheme heterojunction. The photogenerated charge transfer mechanism is revealed by hydroxyl radical trapping experiments and electron paramagnetic resonance (EPR) characterization. The in-situ construction of the Z-scheme heterojunction not only enhances the efficiency of separating the photogenerated carriers but also reduces the photo-corrosion of NiCo 2 S 4 . This study proposes an effective strategy for the design of TiO 2 -based Z-scheme heterojunctions and the application of NiCo 2 S 4 in photocatalysis .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Meng-Jie Chang,Wen-Na Cui,Jun Liu,Kang Wang,Hui-Ling Du,Lei Qiu,Si-Meng Fan,Zhen-Min Luo
TiO 2 /Bi 4 Ti 3 O 12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations. However, the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity. Herein, a robust methodology to construct novel TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 core/shell structures as visible light photocatalysts is presented. Homogeneous bismuth oxyiodide (BiOI) nanoplates were immobilized on electrospun TiO 2 nanofiber surface by successive ionic layer adsorption and reaction (SILAR) method. TiO 2 /Bi 4 Ti 3 O 12 core/shell nanofibers were conveniently prepared by partial conversion of TiO 2 to high crystallized Bi 4 Ti 3 O 12 shells through a solid-state reaction with BiOI nanoplates, which is accompanied with certain transition of TiO 2 from anatase to rutile phase. Afterwards, MoS 2 nanosheets with several layers thick were uniform decorated on the TiO 2 /Bi 4 Ti 3 O 12 fiber surface resulting in TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 structures. Significant enhancement of visible light absorption and photo-generated charge separation of TiO 2 /Bi 4 Ti 3 O 12 were achieved by introduction of MoS 2 . As a result, the optimized TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 -2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO 2 /Bi 4 Ti 3 O 12 . This synthetic method can also be used to establish other photocatalysts simply at low cost, therefore, is suitable for practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Xiong-Fei Zhang,Zhongguo Wang,Yuxia Zhong,Jianhao Qiu,Xingguang Zhang,Yuan Gao,Xiaoli Gu,Jianfeng Yao
In this study, homogeneous alloy Au Pt nanoparticles were successfully immobilized on ultrathin TiO 2 nanorods via a facile photodeposition technique. The Au Pt/TiO 2 hybrid exhibited high photocatalytic activity and stability during the selective photosynthesis of benzaldehyde from benzyl alcohol under visible light . The optimal performance was obtained with the Au 1 Pt 1 /TiO 2 sample, which had a benzyl alcohol conversion rate of 65.3%. The engineered TiO 2 nanorods (304 m 2 /g) can be employed as a stabilizing matrix and an excellent dispersant for noble metal particles. Moreover, the formation of the alloy structure substantially enhances the photoinduced carrier separation efficiency compared with loading Au or Pt alone on TiO 2 . The bimetallic nanoparticles exhibited the properties related to the individual metals, as well as new properties due to synergistic effects of the electron-accumulating function of Pt and the surface plasmon resonance of Au.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 10
·338
·
IF 3.553
Xiaobo Pan,Xinyue Liang,Longfang Yao,Xinyi Wang,Yueyue Jing,Jiong Ma,Yiyan Fei,Li Chen,Lan Mi
TiO2nanoparticles modified with phthalocyanines (Pc) have been proven to be a potential photosensitizer in the application of photodynamic therapy (PDT). However, the generation of reactive oxygen species (ROS) by TiO2nanoparticles modified with Pc has not been demonstrated clearly. In this study, nitrogen-doped TiO2conjugated with Pc (N-TiO2-Pc) were studied by means of monitoring the generation of ROS. The absorbance and photokilling effect on HeLa cells upon visible light of different regions were also studied and compared with non-doped TiO2-Pc and Pc. Both N-TiO2-Pc and TiO2-Pc can be activated by visible light and exhibited much higher photokilling effect on HeLa cells than Pc. In addition, nitrogen-doping can greatly enhance the formation of1O2and •O2−, while it suppresses the generation of OH•. This resulted in significant photodynamic activity. Therefore, N-TiO2-Pc can be an excellent candidate for a photosensitizer in PDT with wide-spectrum visible irradiation.Keywords:titanium dioxide;phthalocyanine;reactive oxygen species;photodynamic therapy
研究领域:
材料科学
·
生物医学工程
·
化学
·
癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2017
·Vol. 2
·期 3
·616-625
·
IF 0
Bin Xue,Tongtao Li,Biwei Wang,Li Ji,Dong Yang,Angang Dong
Rational design of nanostructured anode materials is of importance for promoting the performance of lithium ion batteries (LIBs). Here the Fe3O4 nanoparticles (NPs) were controllably inserted into the matrix of TiO2 nanorods (NRs) to obtain doped-superparticles (SPs) by a facile colloidal self-assembly route and subsequent calcination. To justify the effects of the doping, the lithium storage performances of the doped-SPs were evaluated as anode materials for LIBs. The results indicated that even a slight doping of Fe3O4 NPs can effectively enhance the properties of the anode materials compared with raw TiO2 NR SPs. Additionally, the Fe3O4/(TiO2)70 SPs showed an optimal performance in term of specific capacity, rate capacity, and cycling stability, whose reversible capacity maintained around 550 mA h g−1 at a current density of 1000 mA g−1 after 400 cycles. The highly enhanced lithium storage of the Fe3O4 NP doped-TiO2 NR SPs can substantially be attributed to the synergism of the doped-superstructure, in which the individual merits of the Fe3O4 NPs and TiO2 NRs are fully played out. This work not only demonstrates the significant effects of Fe3O4 NP doping for TiO2 NR SP anode materials in LIBs, but also opens an avenue for the self-assembly synthesis of doped-SPs with extended applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 45
·21010-21023
·
IF 3.3
Taoming Yu,Li Liu,Yuehui Wang,Shiwen Zhang,Lili Li,Ce Liang
The construction of photocatalysts with a Z-scheme heterojunction is considered to be a superior strategy for improving photocatalytic activity. In this study, a photocatalyst (PI/TiC/TiO2) with a Z-scheme heterojunction was fabricated, in which polyimide (PI) and TiO2 were used as the organic/inorganic semiconductor photocatalyst and TiC acted as the transmission bridge for electrons between PI and TiO2. In the self-made air flow photocatalytic reactor, the photocatalytic degradation efficiencies of organic dyes by PI/TiC/TiO2 increased with the increase of both the concentration and diffusion rate of O2. The degradation efficiencies of RhB and MB by PI/TiC/TiO2 reached 93.87% and 90.96%, respectively, within 90 min of visible light exposure, showing its outstanding photocatalytic performance. The mechanism analysis indicated that the Z-scheme heterojunction in PI/TiC/TiO2 facilitated the separation and migration of photoexcited charges while retaining stronger redox capabilities for charge carriers. This study provides an insight into the construction of visible light responsive organic/inorganic photocatalysts with Z-scheme heterojunctions for organic pollution treatment applications.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Traditional bulk photocatalysts often experience serious charge recombination and poor visible-light capturing, resulting in inefficient photocatalytic activity. However, proper nanostructure design usually helps to increase the activity of composite photocatalysts. Here, hollow TiO 2 @g-C 3 N 4 /Co 3 O 4 core-shell microspheres are first reported. The hollow structure of the heterostructured will directionally separate the photogenerated carriers, and the photogenerated holes transferred to the surface will be further captured by Co 3 O 4 to achieve an exposed oxidized surface. The novel multi-stage hollow microspheres can simultaneously achieve effective transfer of photogenerated carriers and extended light absorption. Benefiting from these structural and compositional characteristics, the optimized TiO 2 @g-C 3 N 4 /Co 3 O 4 nanospheres have excellent photodegradation activity for tetracycline and MO. Under simulated sunlight, the degradation rates of TC (10 mg/L) and MO (25 mg/L) at 60 min are 91.6% and 97.8%, respectively. At the same time, high activity is maintained after multiple cycles of testing. Possible transfer paths for photogenerated carriers have also been proposed. This work will provide more inspiration for the design of multi-stage hollow photocatalytic systems.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2021
·Vol. 54
·期 2
·156-164
·
IF 1.607
Li Jian
The TiO 2 is grafted by triethylamine and is introduced on the surface of the carbon fiber, which improves the wettability and activity of the carbon fiber surface and at the same time strengthens the carbon fiber/polyimide composite. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the triethylamine grafting successfully on TiO 2 . Scanning electron microscope (SEM) results show that when the trimethylamine concentration is 1.0%, a uniform coating is formed on the surface of the carbon fiber. The interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) were increased by 32% and 69%, respectively.
研究领域:
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 15
·7465-7473
·
IF 6.97
Meng Zhang,Xuezhang Xiao,Xinwei Wang,Man Chen,Yunhao Lu,Meijia Liu,Lixin Chen
Transition metal compounds are one of the highly efficient types of catalyst for improving the reaction kinetics of hydrogen storage materials. Among all the transition metals, titanium and its compounds show great catalytic effects on magnesium hydride. In this study, for the first time, TiO2 nanosheets with exposed {001} facets were synthesized and doped into MgH2. The TiO2 nanosheet (NS)-doped MgH2 showed superior kinetic performance and the lowest desorption temperature. The onset temperature of MgH2 + 5 wt% TiO2 NS for the release of hydrogen was 180.5 °C and the corresponding peak temperature was 220.4 °C, which are much lower than those of pure MgH2 and also distinctly lower than those of MgH2 + 5 wt% TiO2 nanoparticles (NP). For the isothermal dehydrogenation analysis, the MgH2 + 5 wt% TiO2 NS could release 6.0 wt% hydrogen within 3.2 min at 260 °C and desorb 5.8 wt% hydrogen within 6 min at 240 °C. It is worth noting that the MgH2 + 5 wt% TiO2 NS can even release 1.2 wt% hydrogen at a temperature as low as 180 °C within 300 min. The hydrogenation kinetics of MgH2 + 5 wt% TiO2 NS is also greatly improved, which could absorb hydrogen within only a few seconds at mild temperature. It can take up 3.3 wt% hydrogen at 50 °C and 5.4 wt% at 100 °C within 10 s. It is demonstrated that the tremendous enhancement in reaction kinetics of MgH2 can be ascribed to the nanometer size and highly active {001} facets of anatase TiO2. The higher average surface energy can significantly reduce the hydrogen desorption activation energy of MgH2 to 67.6 kJ mol−1, thus easily improving the hydrogen desorption properties.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chenghong Qiang,Nan Li,Shixiang Zuo,Zhimin Guo,Wei Zhan,Zhengping Li,Jiangquan Ma
Seeking active and low-cost cocatalysts is a vital task for solving the sluggish kinetics of photocatalysis process in environmental management. Herein, we report a novel and high-efficiency crystallized RuTe 2 cocatalyst, and loaded it onto black TiO 2 to form photocatalytic heterostructure (denoted as RuTe 2 /B-TiO 2 ) for diclofenac (DCF) degradation. To the best of our knowledge, the RuTe 2 as a cocatalyst for photocatalysis based on swift electron capture has not been documented yet. The degradation efficiency of DCF over 0.5% RuTe 2 /B-TiO 2 reached 95.2% for 120 min, which is 1.2 times higher than that of pure B-TiO 2 . In addition, the effects of different calcination temperatures, catalyst amounts, DCF concentrations and solution pH of the as-prepared catalysts were also investigated in depth. Spectroscopy/electrochemistry showed that 0.5% RuTe 2 /B-TiO 2 exhibited a narrower band gap, more active sites and better electrical conductivity than pure B-TiO 2 . Experiments with trapping agents have shown that O 2 – was the main active substance under irradiation. Furthermore, intermediates for the photodegradation of DCF were detected by liquid chromatography mass system (LC-MS) and density functional theory (DFT) calculations. Finally, the degradation pathway was rationalized and a possible photocatalytic mechanism for 0.5% RuTe 2 /B-TiO 2 was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 14
·12045-12054
·
IF 2.324
Huang Zhaohui,Chen Hui,Zhao Lei,He Xuan,Fang Wei,Du Yingying,Li Weixin,Wang Guanghui,Zhang Fuqing
With increasing concern about the problems of environmental pollution and energy, the visible light photocatalytic for dye degradation is receiving considerable attention. CdSe quantum dot (CdSe QDs) sensitized MIL-125/TiO 2 @SiO 2 biogenic hierarchical materials (CMTS) has been fabricated through dual modification of CdSe with TiO 2 and MIL-125, that is the metal–organic framework (MOF) with Ti ions as metal centers and terephthalic acid as the organic ligand. The hierarchical porous heterostructured MIL-125/TiO 2 @SiO 2 composites are firstly obtained by a biogenic-templated method using rice husk as biomorphic. CdSe QDs as sensitizer is further deposited on MIL-125/TiO 2 @SiO 2 via a dipping method. This strategy applies CdSe, MIL-125, and TiO 2 undergo a two-level heterostructure, setting a stage for efficient charge separation. In addition, CMTS possesses a hierarchical porous structure in scale from micrometer to nanometer with high BET surface area. As a result, the CMTS can efficiently adsorption target, improving light harvesting and promoting degradation of organic waste from water. Meanwhile, Rhodamine B aqueous solution can be degraded more than 98% by CMTS in 100 min 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
危险品化学品经营许可证（带存储）