Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Chaofan Deng,Chun Cai
Achieving direct cleavage of CO bonds in biomass under mild conditions to generate high-value-added products via catalytic hydrogenation remains a substantial challenge. We developed a Pd–Fe bimetallic catalyst supported on oxygen vacancy (Ov)-enriched TiO2 for the direct cleavage of CO bonds, and as a result, up to 99% yield of 2-methoxy-4-methylphenol (MMP) was achieved from the conversion of vanillin (VAN) at 140 °C under atmospheric H2 pressure. This study utilizes Ov to enhance hydrogen spillover levels during the reaction process and proposes a novel reaction pathway that avoids the formation of alcohol intermediates. Mechanistic investigations reveal that surface Ov facilitates hydrogen spillover, enabling active hydrogen migration from Pd–Fe sites to TiO2 to form Ti–H species. Through synergistic Pd–Fe bimetallic effects and metal–support interfacial interactions, direct hydrodeoxygenation (HDO) of VAN is achieved, ultimately generating MMP with high selectivity. The catalyst demonstrates excellent stability and broad substrate suitability, maintaining uncompromised activity after five catalytic cycles.
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产品关联
DOI
高影响因子
Journal of Mechanics in Medicine and Biology
·
2022
·
IF 0.883
ZHENHUA WANG,ZHIWEI ZHOU,YIFAN LI,WANQIONG NIU,LIJUAN REN
Purpose: To explore the improvement of its low temperature aging resistance by co-doping oral 3Y-TZP with TiO 2 and GeO 2 . Methods: After the samples of 3Y-TZP co-doped with GeO 2 and TiO 2 were prepared by mechanical ball milling, drying, and pressureless sintering, the microstructure was studied by scanning transmission electron microscope, energy spectrometer, and high angle annular dark field detector. After treatment in the autoclave, the conversion of all samples was measured by XRD. Results: After mechanical ball milling for 24 hours, the particle size of the composite powder of 3Y-TZP co-doped with GeO 2 and TiO 2 is uniform, distributed at about 50 nm, the particle shape is basically spherical, the dispersion is good, but there is a small amount of agglomeration; Tetravalent stabilizers (Ge 4 + , Ti 4 + ) can inhibit the low-temperature aging effect of zirconia materials. With the increase of germanium oxide doping, the hydrothermal degradation resistance of zirconia can be improved. GeO 2 doped 3Y-TZP has better low temperature aging resistance than TiO 2 doped 3Y-TZP. With the increase of dopant content, the degree of grain boundary segregation increases, but even if the doping amount of Ge 4 + is small, the degree of grain boundary segregation can be comparable to that of Ti 4 + with a large doping amount. Conclusion: In this paper, the composite powder of 3Y-TZP co-doped with GeO 2 and TiO 2 with uniform particle size and good dispersion was prepared by mechanical ball milling. The preparation process is simple, the energy consumption is low, and the cumbersome processes of the co-precipitation method and liquid-phase method are avoided. On the other hand, adding GeO 2 and TiO 2 can enhance the low-temperature aging resistance of 3Y-TZP ceramics. GeO 2 is superior to TiO 2 in low-temperature degradation resistance, which can be used as the first choice. This study contributes to the research on doping cations of dental zirconia and provides a reference for dentists to choose a reasonable zirconia material.
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yu Jiang,Yu Shang,Wei Zhang,Xiangling Zhang,Jiangyun Li,Senlin Shao
The widely used SiO 2 and TiO 2 nanoparticles (NPs) can accumulate in industrial wastewaters , thereby posing challenge to biological wastewater treatment processes. In this work, the performance of aerobic granular sludge (AGS) reactors fed with wastewater containing 50 mg L −1 SiO 2 and TiO 2 NPs were investigated. The results showed that the granules could resist the NPs in wastewater (no disintegration of granules was observed). SiO 2 NPs had a negative effect on the settleability of granules, with the SVI 30 increased by 64.5% and protein secretion decreased by 29.9%. To the contrary, the settleability of granules was improved in the presence of TiO 2 NPs due to the increase of the protein secretion. Possibly because of the compact and layered structure of granules, in the presence of both types of NPs, no obvious reduction of the overall removal efficiency of organics was found, and nanoparticle-resistant strains were enriched. The overall nitrification and denitrification efficiencies were hardly affected by SiO 2 NPs while significantly inhibited by TiO 2 NPs. Some functional genera, such as Hyphomicrobium and Acidovorax , showed growth inhibition with TiO 2 NPs, which might be responsible for the reduction of nitrification and denitrification efficiencies.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·Vol. 44
·期 12
·14811-14816
·
IF 3.057
Yudong Sui,Lina Han,Yehua Jiang
In this study, the effect of Ta 2 O 5 addition on the phase evolution and mechanical properties of sintered (1600 °C, 4 h) TiO 2 -added yttria-stabilized zirconia-toughened alumina (ZTA) ceramic composites was investigated. The scanning electron microscopy and X-ray diffraction results revealed the formation of a new tantalum zirconium oxide, TaZr 2.75 O 8 , with a block-like morphology at Ta 2 O 5 contents higher than 1 wt%. The grain sizes of both the Al 2 O 3 and yttria-stabilized zirconia phases first increased and then decreased with an increase in the Ta 2 O 5 content. The relative density, Vickers hardness , and fracture toughness of the composites were found to be strongly dependent on their grain sizes, relative densities, and the formation of the TaZr 2.75 O 8 secondary phases. The composite with 3 wt% Ta 2 O 5 showed the highest relative density (99.3%), Vickers hardness (1932 HV), and fracture toughness (8.21 MPa m 1/2 ).
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Sheng Feng,Guiliang Zhu,Lili Cao,Runbai Wang,Shuguang Liu
In the work, the layered TiO 2 NS/UiO-66/GO composites were successfully prepared through an in-situ method. Two-dimensional TiO 2 NS combined with UiO-66/GO to form a layered structure. The prepared samples were characterized by X-ray diffraction, thermogravimetric analysis, Brunauer–Emmett–Teller test, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, UV–Vis DRS and PL spectra. TiO 2 NS/40%UiO-66/GO exhibited the most efficient adsorption (20 and 1.3 times those of TiO 2 NS and UiO-66/GO, respectively) through absorbing Congo red (CR). It also displayed the strongest photocatalytic activity (29 and 2 times those of TiO 2 NS and UiO-66/GO, respectively) for degrading CR dye under visible-light irradiation (λ ≥ 420 nm). The removal rate of CR was nearly 100%. Besides, TiO 2 NS/40%UiO-66/GO showed excellent stability even after four cycling runs of adsorbing and photodegrading CR. The results showed that TiO 2 NS/UiO-66/GO composites were highly efficient adsorption and catalytic bifunctional materials. TiO 2 NS/UiO-66/GO composites provide an important basis for combining metal organic frameworks/GO with photocatalytic semiconductors to improve absorption and photocatalytic performance to better treat organic wastewaters.
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DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 37
·19718-19725
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IF 5.968
Xiao Zhao,Jianbing Zhu,Liang Liang,Jianhui Liao,Changpeng Liu,Wei Xing
The development of advanced support materials displays the potential for both reducing the cost and simultaneously increasing the activity of catalysts. In the current work, a novel N-doped carbon coated hydrophilic titanium dioxide (TiO2@N-doped C) nano-composite, constructed by the procedure of an in situ polymerization and subsequent pyrolysis, was utilized to support Pt nano-crystals for the methanol oxidation reaction (MOR). The as-prepared Pt/TiO2@N-doped C catalyst generated 1.74-fold higher activity, 2.08-fold higher stability and much better resistance to CO poisoning than a commercial state-of-the-art Pt/C catalyst. The enhanced catalytic performance was ascribed to the improved CO tolerance and the catalyst–support interaction due to the utilization of the TiO2@N-doped C nano-composite, which not only provides rich active –OH groups to promote CO oxidation via the bifunctional mechanism, but also modifies the electronic structure of the Pt NPs to improve the intrinsic kinetics of MOR. The as-developed TiO2@N-doped C nano-composite is a highly promising catalyst support material for use in fuel cell technology.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 4
·9416-9427
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IF 5.19
Zhu Dandan,Shi Linan,Li Haoming,Zhang Jinyi,Zhang Jiupeng,Wei Cundi
In this study, TiO 2 /MSGM composite material with adsorption-photocatalytic properties was prepared by extracting mesoporous silica glass microsphere (MSGM) from coal gasification fine slag (CGFS) as a novel TiO 2 carrier. The results of characterization and properties of the composite showed that MSGM could improve the adsorption capacity and photocatalytic activity of the composite by improving the pore structure of the composite, hindering the growth of TiO 2 particles, increasing the phase transition temperature of TiO 2 , enhancing the dispersion of TiO 2 particles. The sample 1:3-TiO 2 /MSGM-2–500 prepared under the optimized conditions possesses satisfactory morphology characteristics, high adsorption capacity, and photocatalytic activity to rhodamine B (RhB). The synergistic effects of adsorption and photocatalytic significantly increase the total removal rate of RhB. This study not only provides a new direction for high-value-added resource utilization of CGFS but also gives a new kind of low-cost carrier material with adsorption property for TiO 2 loading to remove organic dye pollutants.
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DOI
高影响因子
Science China-Materials
·
2016
·Vol. 59
·期 10
·833-841
·
IF 0
Shen Ting,Tian Jianjun,Li Bo,Cao Guozhong
TiO 2 nanocrystals are widely used in photoanodes for quantum dot solar cells (QDSCs) owing to their chemical stability and suitable energy band structure. However, surface defects and grain boundaries of TiO 2 nanocrystals photoanodes allow high surface charge recombination, which limits the performance of QDSCs. In this work, an ultrathin TiO 2 layer is introduced to the surface of TiO 2 photoanodes by atomic layer deposition (ALD). The ultrathin layer not only reduces the surface defects of TiO 2 nanoparticles and strengthens the connection between adjacent nanoparticles to suppress the charge recombination for improving the electron collection efficiency (η cc ), but also increases the surface energy of photoanodes to load more quantum dots (QDs) for enhancing the light harvesting efficiency (LHE). As a result, the solar cell based on CdS/CdSe QDs with ALD treatment exhibits an efficiency of 5.07% that is much higher than that of the cells without modification (4.03%).
研究领域:
材料科学
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纳米科技
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能源化学
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光伏技术
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表面工程
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半导体物理
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光电转换
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DOI
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jingying Xu,Teng Hou,Jing Zhou,Hao Ye,Yaru Wang,Lvzhu Cheng,Xianglong Li,Bin Yang
Photocatalytic fibrous membranes are regarded as one of the most proficient materials for environmental remediation because of their excellent photocatalytic activity, porous structure, and outstanding recyclability. However, the poor dispersion performance of photocatalysts in the polymer matrix and the low migration ability to the surface constrain the development of this technology. In this study, a versatile strategy was developed to facilitate the design of hydrophilic nanofibrous membranes with promising photocatalytic activity and robust recyclability by combining the loaded rare earth element La 3+ modified TiO 2 photocatalyst, introducing hyperbranched polymers as dispersants within electro-centrifugal spinning, and applying post-treatment to construct hydrophilic sites. Significantly, the removal efficiency of the fibrous membrane materials on the dye wastewater was as high as 89.34 %, and the treatment efficiency can still reach 81.68 % after five cycles. In addition, the photocatalytic mechanism for the degradation of organic pollutants was also analyzed. This work provides a new method for building advanced photocatalytic nanofibrous membranes, which is expected to be used in the treatment and remediation of environmental wastewater.
研究领域:
环境科学
·
材料科学
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纳米技术
·
化学工程
·
光催化
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高分子材料
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水处理技术
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DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Xinbo Zhao,Jianhong Zhao,Jingcheng He,Bo Li,Yumin Zhang,Jicu Hu,Huapeng Wang,Dongming Zhang,Qingju Liu
Fully printable, hole-conductor-free, carbon-based perovskite solar cells are attractive and promising for industrial production due to their low cost and high stability. However, the efficiency of this type of device is difficult to improve due to the undesirable interfacial contact during the printing process compared to the spin coating process and the higher recombination ratio than the devices with a hole conductor. Herein, a porous anatase nanocrystal (Nano-TiO2) derived by MIL-125, a type of titanium-based metal–organic frameworks (MOFs), was used as the electron transporting material (ETM). The Nano-TiO2 can be conveniently covered on a substrate by screen-printing and still maintain the cakelike morphology, which is beneficial to large-scale production. Moreover, the cakelike morphology composed of nanocrystals is more favorable for the crystallization of perovskites than commercial TiO2 (P25) and can reduce the recombination of photogenerated electron–hole pairs to improve device performance. The device based on Nano-TiO2 shows a VOC of 0.907 V and a fill factor of 68.14% at the forward scan, which is higher than that of the devices based on P25 (0.853 V and 52.95%). It paves a promising way for carbon-based printable perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
能源工程
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DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Yuqing Xiao,Changlei Wang,Kiran Kumar Kondamareddy,Nian Cheng,Pei Liu,Yunhang Qiu,Fei Qi,Sen Kong,Wei Liu,Xing-Zhong Zhao
Nanoporous submicron TiO2 spheres of diameters around 200 nm are synthesized by a hydrothermal process and used as a scaffold layer for improving light absorption, charge transportation, as well as photovoltaic performance in hole-transport-layer free perovskite solar cells employing carbon counter electrodes. The TiO2 submicron spheres show a porous feature with high specific surface area, which is essential for perovskite infiltration, charge extraction, and transportation in mesoscopic perovskite solar cells. Furthermore, big spheres exhibit better light scattering property compared to traditional TiO2 nanoparticles, thus enhancing light absorption in corresponding devices. The present perovskite solar cells employ a TiO2 scaffold layer of optimized thickness of about 600 nm and show an average power conversion efficiency of 13.46 ± 0.41%, which is 18.4% higher than that of counterparts based on TiO2 nanoparticle (11.37 ± 0.40%). The champion cell exhibits an impressive efficiency of 14.3%, which is very competitive in perovskite solar cells without a hole transport layer using a carbon electrode. Moreover, our carbon based perovskite solar cell shows excellent long-term stability against moisture and heat with negligible degradation for 210 days of storage under ambient conditions.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
能源工程
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DOI
International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 12
·11987-11996
·
IF 1.5
Ju Rong,Meng Kun,Xiaohua Yu,Zhang Yannan
In order to increase the cycling performance and reversible capacity of Co 3 O 4 electrode materials, TiO 2 /Co 3 O 4 anode materials were prepared by a two-step hydrothermal method. The phase composition, structure and morphology of the TiO 2 /Co 3 O 4 anode materials were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The electrode performance of the materials was tested by a battery discharge and charge tester and an electrochemical workstation. The results shows that the TiO 2 /Co 3 O 4 nanostructured materials consist of a new type of nest-like nanostructure, formed by an external mechanical force. A single nest-like TiO 2 /Co 3 O 4 nanostructure is composed of the monoclinic TiO 2 -B and cubic Co 3 O 4 phases. The nanostructured materials have excellent electrochemical performance, with a capacity of 650 mAh/g and a current density of 33.5 mA/g after 100 cycles.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
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DOI
高影响因子
危险品化学品经营许可证（带存储）