CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yang Xu,Dong Lin,Ze Zong,Qiuming He,Zhe Ma,Xuliang Deng,De Chen,Chaohe Yang,Xiang Feng
Demetalation-metalation method has gained prominence for its higher metal loading, efficiency and shortened synthetic period, particularly in the incorporation of metal atoms with large radii into zeolite framework in recent years. An ammonia-regulated approach has been developed for selectively evolved deep-substituted Ti precursors in dealuminized beta zeolites, which enables a controlled promotion of metalation of Ti atoms. Additionally, this ammonia-regulated approach could also enhance 1-hexene kinetic adsorption by constructing mesopores, which is demonstrated by the lower reaction order of 1-hexene. The synthesized ammonia-regulated N-Ti-beta exhibits rich framework Ti species and a high specific surface area, leading to significantly improved 1-hexene epoxidation performance (conversion of 61%, selectivity of 98%, and a high H 2 O 2 utilization efficiency of 93%). This study not only provides a new strategy to dynamically regulate evolution of Ti precursors by ammonia but also holds promise for advancing related industrial processes in demetalation-metalation methods.
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高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 2
·1-18
·
IF 2.4
Xu Lingling,Pan Xiaomei,Gao Lijing,Wei Ruiping,Li Jihang,Wen Xiu,Li Yuanzhuang,Xiao Guomin
UiO–66–NH 2 (Ti/Zr) modified by Ti metal oxide (TiO 2 ) was used to catalyze the hydrolysis of cellulose to prepare 5-HMF. Under the optimal reaction conditions of H 2 O(NaCl)/THF(1/4 mL), 190 °C, 2 h and 50 mg UNT-3(Ti/Zr) (TiO 2 and UiO–66–NH 2 with mass of 1.5 and 0.1 g, respectively), the yield of 5-hydroxymethylfurfural reached 59.88%. UiO–66–NH 2 (Ti/Zr) nanocomposites with different mass ratios were successfully prepared by simple solvent evaporation method. SEM and TEM have shown that the modified UiO–66–NH 2 (Ti/Zr) are wrapped into sphere by TiO 2 densely attached to the surface of UiO–66–NH 2 , which provides favorable conditions for the uniform dispersion of TiO 2 and coordination of the Lewis acidic site of UiO–66–NH 2 . NH 3 –TPD results confirmed the existence of super-strong, strong, middle and weak acid sites in UiO–66–NH 2 (Ti/Zr), and Py-FTIR confirmed the existence of Brønsted and Lewis acids. After four cycles, the yield of 5-HMF and FUR decreased slightly from 59.88 to 51.89% and 9.11 to 7.66%, respectively, and the yield of 5-HMF could still remain above 50%. The results showed that the modified composite treatment of TiO 2 with rich Lewis acid/base and UiO–66–NH 2 could provide a certain idea for the extensive application of biomass research in the future. Graphic
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Weijia Guo,Yutian Lu,Chongyang Zhang,Zhenxing Yue
Low-loss (high- Q × f , where Q = 1/tan δ ) dielectric ceramics can help achieve efficient microwave signal transmission and reduce heat generation. In the traditional Ca-Ln-Ti-O perovskite system (where Ln = rare earth) with the general formula of Ca 1– x Ln 2 x /3 TiO 3 (CST x ), the sharp decline in the Q × f value when x > 0.5 remains unexplained, posing a challenge for designing low-loss ceramics. In this study, CST x ceramics ( x ≤ 0.7) are synthesized via the solid-state reaction method, with a focus on their structure, defects, and broadband dielectric properties. A significant discrepancy between the Q × f values in the microwave and terahertz bands is found when x ≥ 0.6, suggesting the presence of additional loss mechanisms in the microwave band beyond ion displacement depolarization. Meanwhile, the low-frequency dielectric spectra show a weak dielectric relaxation in the low-temperature region, attributed to the partially ordered A -site vacancies. Therefore, this relaxation can act on the microwave frequency band at room temperature, resulting in a sharp decline in Q × f values. Such low-frequency and low-temperature dielectric relaxation should not be ignored in the research of microwave dielectric ceramics. These findings provide a crucial theoretical reference for developing low-loss microwave dielectric ceramics.
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WATER RESEARCH
·
2025
·
IF 12.4
Lingyu He,Xin Zhang,Yang Lei
This study proposes a hybrid electrochemical oxidation-coagulation (EOC) system that integrates a Ti₄O₇ anode with a cathode fabricated from waste aluminum cans, enabling the simultaneous degradation of phosphonates and removal of hardness ions from cooling water. Compared to standalone electrooxidation (EO) and conventional chemical coagulation (CC), the EOC system achieved 41.9% Ca²⁺ removal, 91% total soluble phosphorus (TSP) elimination, and 67.2% conversion of phosphonate to phosphate within 2 hours. Mechanistic studies revealed that the hybrid EOC system performs a synergistic effect, including anodic oxidation of antiscalant (nitrilotris methylene phosphonic acid, NTMP), and the cathodic dissolution of aluminum, generating coagulants that facilitate the concurrent removal of hardness ions and residual phosphorus. The presence of chloride ions enhanced NTMP degradation via the generation of reactive chlorine species (RCS) without impacting Ca²⁺ removal efficiency, whereas the presence of magnesium ions promoted Ca²⁺ removal via Mg(OH)₂ formation, which provides nucleation sites for co-precipitation. On top of mechanical insights, practical validation with real cooling water confirmed the practical effectiveness and robustness of the EOC system. Moreover, energy consumption analysis revealed that the EOC system significantly reduced energy demand for calcium and TSP removal by 91% and 76%, respectively, compared to the EO system. Overall, this work underscores an efficient and cost-effective electrochemical approach for industrial cooling water treatment, establishing foundational insights for scalable implementation.
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PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Wenping Cao,Jiabin Tu,Nuo Xu,Zhuang Wang,Xinyan Xiong,Qianru Lin,Jiazhi Wang,Nan Zhang,Jie Sheng,W.L. Li
Optimizing energy storage performance often involves increasing the discrepancy between maximum polarization and remanent polarization ( P max - P r ) and breakdown strength ( E b ). Here, aging treatment in acceptor doped NBT-based film is taken for increasing both E b and P max - P r by constructing ordered defect dipoles. Enhanced P max - P r value of 80.6 μC/cm 2 and high E b of 2630 kV/cm are obtained in the aged (Na 0.5 Bi 0.5 ) 0.55 Sr 0.45 Ti 0.99 Mn 0.01 O 3 thin film, which can be attributed to the reversible domain switching caused by ordered defect dipoles and low oxygen vacancies concentration. Accordingly, an energy density of 72.4 J/cm 3 with an efficiency of 76.8 % was achieved simultaneously in the aged film, which are approximately raised by 80.6 % and 45.2 %, respectively, compared with the unaged state. The stable energy storage performances are achieved within the scope of operating temperatures (20–200 ◦ C) and frequencies (0.2–10 kHz). These results provide a new route to take usages of aging process for optimizing the energy performance of NBT-based thin films.
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 6
·1441-1450
·
IF 7.2
Chen Xunlei,Chen Lin,Tian Jiang,Xu Cheng,Liao Jiaxin,Li Tianyu,Wang Jiankun,Feng Jing
Thermal and mechanical properties of yttrium tantalate (YTaO 4 ), a top coat ceramic of thermal barrier coatings (TBCs) for aeroengines, are enhanced by synthesizing Y 1− x Ta 1− x M 2 x O 4 (M = Ti, Zr, Hf; x = 0.06, 0.12, 0.18, 0.24) medium-entropy ceramics (MECs) using a two-step sintering method. In addition, the thermal conductivity, thermal expansion coefficients (TECs), and fracture toughness of MECs were investigated. An X-ray diffraction study revealed that the Y 1− x Ta 1− x M 2 x O 4 MECs were monoclinic, and the Ti, Zr, and Hf doping elements replaced Y and Ta. The variations in atomic weights and ionic radii led to disturbed atomic arrangements and severe lattice distortions, resulting in improving the phonon scattering and reduced thermal conductivity, with Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) exhibiting the lowest thermal conductivity of 1.23 W·m −1 ·K −1 at 900°C. The introduction of MO 2 increased the configurational entropy and weakened the ionic bonding energy, obtaining high TECs (10.4 × 10 −6 K −1 at 1400°C). The reduction in the monoclinic angle β lowered the ferroelastic domain inversion energy barrier. Moreover, microcracks and crack extension toughening endowed Y 1− x Ta 1− x M 2 x O 4 MECs ( x = 0.24) with the highest fracture toughness of (4.1 ± 0.5) MPa·m 1/2 . The simultaneous improvement of the thermal and mechanical properties of the MO 2 (M = Ti, Zr, Hf) co-doped YTaO 4 MECs can be extended to other materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 22
·36739-36745
·
IF 5.6
Peilin Qing,Ning Guan,Yang Yang,Huizi Qiu,Weishuang Fang,Huaicheng Xiang,Ying Tang,Jie Li,Liang Fang
Crystal structure refinement and Raman spectroscopy were performed on Ca 3 M 2 Ga 2 GeO 12 (M = Ti, Sn, Zr) garnet-structured ceramics to explore the relationships between crystal structure, phonon modes, and microwave dielectric properties . The Ca 3 Ti 2 Ga 2 GeO 12 , Ca 3 Sn 2 Ga 2 GeO 12 , and Ca 3 Zr 2 Ga 2 GeO 12 ceramics were obtained by sintering at 1325–1475 °C for 6 h, and good microwave dielectric properties were achieved: ε r = 15.04, 9.53, and 11.89; Q × f = 59,515 GHz, 49,355 GHz, and 45,587 GHz; and τ f = −47.3 ppm/°C, −52.3 ppm/°C, and −43.0 ppm/°C, respectively. M 4+ (M = Ti, Sn, Zr) cations entirely occupied the octahedral site, leading to an average underbonding between cations and anions, a weak rattling effect, and measured ε r values deviating from theoretical values. The packing fraction and Raman FWHM (A 1g mode) correlated highly with the Q × f values. The negative τ f values were derived from the large positive temperature coefficient of permittivity ( τ ε ) and the temperature coefficient of ionic polarizability ( τ αm ).
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Xiaomin Hu,Zhe Chen,Jiayou Ji,Liang Li,Huabo Huang,Shidi Wei
Fiber-shaped supercapacitors (FSCs) serve as optimal energy storage components in wearable platforms. However, traditional fiber materials suffer from poor interfacial cross-linking, disordered microstructures, insufficient active sites, and low electrical conductivity. To overcome these challenges, this research develops Zn-MoO₃/Ti₃C₂Tₓ hybrid fibers via wet-spinning technology employing glacial acetic acid as a coagulation bath, with MoO₃ quantum dots intercalated into Ti₃C₂Tₓ interlayers and Ti₃C₂Tₓ nanosheets cross-linked by Zn 2+ . The resulting hybrid fibers feature expanded interlayer spacing, a large ion-accessible surface area, abundant porous channels, exceptional electrical conductivity, and excellent mechanical properties, delivering an exceptional volumetric capacitance of 2078.2 F cm −3 at 2 A cm −3 with 75.0 % capacitance retention at 20 A cm −3 . Furthermore, the constructed FSCs achieve a substantial energy density of 55.6 mWh cm −3 at a power density of 400 mW cm −3 , with 94.7 % capacitance retention after 5000 cycles, and successfully power an electronic timer, demonstrating their potential for wearable applications.
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2025
·
IF 1.6
Zelong Liu,Peihang Shen,Chunlai Liu,Na Wang,Jianglei Hu,Yibo Zhang
In this work, Ti-Mesoporous silica (Ti@SBA15)-supported phosphomolybdic acid (HPMo) composites, HPMo/Ti@SBA15, were synthesized by a one-pot hydrothermal method. The physical and chemical properties of the composites were characterized by XRD, N2 adsorption-desorption, FT-IR spectroscopy, TEM, SEM, and XPS. The results showed that the pores and surface of SBA-15 were loaded with HPMo and Ti(IV), and the dual active sites were well dispersed without agglomeration. The HPMo/Ti@SBA15 composite exhibited better performance than the single active site catalysts, HPMo@SBA15 and TiO2@SBA15, with high catalytic activity and stable reusability during oxidative desulfurization. The dispersion of the dual active components within the SBA-15 cages and synergistic catalytic effects between the two gave the composites catalytic activity and stability in the desulfurization experiments with different sulfur-containing substrates.
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高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·123012
·
IF 2.142
Junze Zhang,Hongning Wang,Ruoyu Chen
During the electrochemical preparation process, the electron transport rate in the PbO2 active layer could be greatly increased resulting from reduction in the oxidation of the Ti substrate, which effectively improved the service life and catalytic degradation efficiency of the PbO2 Dimension Stable Anode (PbO2 DSA) electrode. Through adding nano-acetylene black (ACET) and polyvinyl pyrrolidone (PVP) into the plating solution, an ACET doped Ti/PbO2 electrode was successfully prepared via an anodic oxidation method. Results of field emission scanning electron microscope (FESEM), diffraction of X-rays (XRD), transmission Electron Microscope(TEM) and X-ray photoelectron spectroscopy (XPS) characterization indicated that 2.10 ∼ 2.75 wt% of ACET doping amount hardly changed the morphology and lattice constant of the PbO2 electrode. With electrochemical alternating current impedance spectroscopy (EIS) and cyclic voltammetry (CV), it confirmed that ACET reduced the charge transfer impedance (Rct) of the PbO2 electrode up to 95%, and restrained the potential of oxygen evolution reaction(OER). With the increase of electron transport rate, the generation rate of hydroxyl radicals (·OH) on the electrode surface was enhanced significantly. Compared with the Ti/PbO2 electrode, the ACET-doped Ti/PbO2 electrode exhibited higher electrocatalytic efficiency to phenol degradation. During the degradation process, the consumption of time and energy could be reduced by 33% and 34%, respectively. At the same current density, the required voltage for preparing the ACET-modified Ti/PbO2 electrode was much lower. In the assistant of lower deposition voltage, the ACET-doped Ti/PbO2 electrode possessed a stronger binding force to Ti substrate, and meanwhile obtained a longer lifespan.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yanhong Gu,Jianguo Zhao,Weiying Zhang,Haiwu Zheng,Laimei Liu,Wanping Chen
Sm and Ti co-doped BiFeO 3 (BFO) ceramics with Fe vacancies—Bi 0.86 Sm 0.14 FeO 3 , Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 , and Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 —were prepared by a solid-state method using a rapid liquid process. X-ray diffraction indicated that all samples exhibited a rhombohedral structure with a minor secondary phase. The structural transformation from a rhombohedral (space group: R 3 c ) to orthorhombic structure (space group: Pnma ) was observed in the sample of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , which was also confirmed by Raman scattering spectra. Microstructural investigations with scanning electron microscopy showed a reduction in grain size with doping of BFO. The dielectric loss of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 reaches 0.05 (at 100 Hz) owing to the introduction of Ti and Fe vacancies. Ferroelectromagnetic measurements revealed the existence of ferroelectricity with a remanent polarization of 0.24 µC/cm 2 in Bi 0.86 Sm 0.14 FeO 3 , paraelectricity in Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , and weak ferromagnetism with a remanent magnetization of 0.2 emu/g in Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 . The two composition-driven phases exist simultaneously and the different coercive field might be related to the jumps in the ferromagnetic hysteresis loops. Both the ferroelectric and magnetic properties were shown to correlate with the composition-driven structural evolution.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 10
·1-6
·
IF 2.175
Zhang Ying,Chen Yu,Zhang Yupeng,Cong Huahua,Fu Bo,Wen Shanpeng,Ruan Shengping
A novel porous nanosized humidity-sensing material of amine-functionalized titanium metal organic framework (MOF), NH 2 -MIL-125(Ti), was investigated. NH 2 -MIL-125(Ti) nanoparticles with high phase purity and good physicochemical property were synthesized by a simple hydrothermal method. The nanosized MOF was characterized by X-ray diffraction and scanning electron microscope. The average size of the MOF nanoparticles is around 300 nm. Then NH 2 -MIL-125(Ti) humidity sensor was fabricated by coating the nanosized materials on interdigitated electrodes. The humidity sensor based on NH 2 -MIL-125(Ti) shows good linearity of RH (11–95 % RH), as well as fast response and recovery time. The RH detecting range is from 11 to 95 % RH at 100 Hz. The response and recovery time are about 45 and 50 s, respectively. Moreover, the sensing mechanism was discussed by complex impedance analysis in detail. These results indicate the potential application of NH 2 -MIL-125(Ti) in humidity sensors.
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高影响因子
危险品化学品经营许可证（带存储）