JOURNAL OF THE ENERGY INSTITUTE
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2022
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IF 6.47
Pijun Gong,Feng He,Junlin Xie,Haitao Wu
Zn species that exist in the flue gas are dangerous toxicants for SCR catalysts, which will seriously damage its catalytic activity and service life. Hence, the multi-layered nanosheets γ-Al 2 O 3 with (110) facets were introduced into the CeTiOx catalyst to improve the Zn-poisoning resistance performance. Benefiting from the structural and compositional merits, as well as the superior reducibility, abundant acid sites, and chemisorbed oxygen, the 3%Zn–Ce 0.3 -Al 0.4 -Ti catalyst with multi-layered nanosheets structure exhibits excellent NH 3 -SCR activity, over 90% NO conversion between 240 °C and 340 °C. In addition, in situ DRIFTS results suggest the SCR reaction mainly follows L-H and E-R mechanisms on 3%-Ce 0.3 -Al 0.4 -Ti samples, result from the multi-layered nanosheets γ-Al 2 O structure improves the BET specific surface area and Ce 3+ , promotes the adsorption/activation of more NH 3 and NOx species. More interestingly, compared with CeO 2 and TiO 2 the Zn species prefer to absorbed on nanosheets γ-Al 2 O 3 with (110) facets, so it can effectively protect CeO 2 from poisoning as a sacrificial agent .
研究领域:
环境科学
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催化材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hongmin Dai,Xuan He,Xing Du,Weixin Li,Daheng Wang,Hui Chen,Wei Fang,Lei Zhao
Applying piezoelectric effect on modulating charge transport behavior was considered as one efficient strategy to make feasible charge separation in photocatalysts towards boosting hydrogen evolution performance. Here, with employing corona-poling treatment, SrTiO 3 is converted to be a piezoelectric component in the constructed type II NH 2 -MIL-125(Ti)/SrTiO 3 heterojunction . Since the piezoelectric field could tilt the band bending to a degree to be convenient for the charge transfer from SrTiO 3 to NH 2 -MIL-125(Ti), it is also favorable to offer additional active sites on SrTiO 3 to form dual reduction sites for the following piezo-photocatalytic reaction. Both the ameliorated surficial polarization and charge transfer trajectory in NH 2 -MIL-125(Ti)/SrTiO 3 type II heterojunction are devoted to the boosted hydrogen production rate for NH 2 -MIL-125(Ti)/SrTiO 3 -0.1 (NM/STO-0.1), that is up to 1562.3 μmol h −1 g −1 , 1.79 times higher than that of unpolarized NM/STO-0.1 (871.6 μmol h −1 g −1 ) and 2.35 times higher than that of NH 2 -MIL-125(Ti) (663.8 μmol h −1 g −1 ), respectively. This research reported initially the assistant of SrTiO 3 with piezoelectric feature for enhanced performance photocatalytic hydrogen evolution, which could be one prominent strategy to achieve the reasonable design of efficient photocatalytic system.
研究领域:
材料科学
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纳米技术
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催化
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能源材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 6
·3535-3544
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IF 2.302
Gao Xiufeng,Chen Shaoping,Dong Feng,Hu Lifang,Yang Renyao,Wang Wenxian,Munir Zuhair A.
The diffusion bonding between Ti and Ni was investigated in the presence and absence of an imposed electric current. Bonding was carried out over the temperature range of 873–1123 K and the current density range of 255–350 A/cm 2 . The formation and sequence of evolution of the three intermetallic phases, TiNi 3 , TiNi, and Ti 2 Ni, were investigated and discussed in light of calculations of Gibbs free energies of formation and interfacial energies associated with their nucleation. Within the experimental times and in the presence of a current, the growth of the three phases was parabolic. The evolution of the TiNi phase required an incubation period, while the relatively high growth rate of TiNi 3 suggests the possibility of another mechanism. The growth of all phases was enhanced by the application of a direct current, with no apparent dependence on its direction.
研究领域:
材料科学
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冶金学
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电化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 23
·11341-11349
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IF 3.925
Chentao Hou,Xiaoping Yuan,Miaomiao Niu,Yijie Li,Liping Wang,Mingyuan Zhang
The in situ synthesis method was used to grow Co-based one-dimensional MOF Co-PYDC (CP) on a pre-synthesized TiO2/TiOF2 (TOF) material which was used to treat tetracycline antibiotic wastewater. Through the degradation of tetracycline hydrochloride (TCH) under simulated sunlight, the photocatalytic activity of the synthesized samples was investigated. The results showed that the 5% CP/TOF photocatalyst exhibited the best photocatalytic performance on tetracycline hydrochloride degradation. The adsorption efficiency of TCH was 48% in the dark reaction for 0.5 h, and the removal efficiency reached 85% under 1.5 h simulated sunlight, which was much higher than those of TOF and CP monomers. Among them, the prepared 5% CP/TOF nanocomposite had a lower bandgap energy (2.63 eV), a larger specific surface area (52.01 m−2 g−1) and a lower electron–hole recombination rate. The synthesized CP/TOF photocatalyst showed promising application potential in antibiotic wastewater treatment. Moreover, the detected superoxide radical was the main active species, which further explained the degradation pathway and catalytic mechanism of the CP/TOF photocatalytic degradation of TCH, following the z-type heterojunction model. In this study, a CP/TOF composite material for photocatalytic degradation of tetracycline wastewater was designed and developed, which provided experimental methods and ideas for the practical treatment of wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 15
·43702-43713
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IF 5.8
Guo Jin,Sun Yihua,Luo Qiuzi,Zhang Jiangyu,Fang Liang
Innovative solar-driven heterostructure photocatalysts are promising for removing the organic contaminants in the water environment. In this work, a sequence of well-defined Z-scheme Ti-Ga co-doped ZnO/g-C 3 N 4 (TGZ/CN) heterostructure photocatalysts were developed via a simple sol–gel method and the single-phase dispersion method in order to realize the cooperative improvement from the Ti/Ga co-doping and construction of heterostructure. The synthesized samples were analyzed by a variety of characterization techniques, and the photocatalytic activity was assessed by photodegradation of methylene blue (MB) under visible light irradiation. Compared to the ZnO and g-C 3 N 4 , the TGZ/CN composite demonstrated higher photocatalytic performance for the degradation of MB indicating an efficient photocatalytic degradation rate of 95.4% in 105 min under visible light. Moreover, the TGZ/CN photocatalyst exhibited excellent stability after five cycles of MB photodegradation. Furthermore, the as-prepared composites’ possible photocatalytic mechanism was discussed in detail. The improved photocatalytic performance primarily resulted from the effectively reduced band gap of ZnO after Ti/Ga co-doping and the facilitated separation of photoexcited e − /h + pairs caused by the construction of Z-scheme heterojunction. This work offers novel insights in developing hybrids with highly efficient photocatalytic activity towards future environmental applications. Graphical abstract
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
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaohui Wu,Jingkang Xu,Yulan Jing,Yuanxun Li,Hua Su
The increasing demand for miniaturized electronic devices requires the development of advanced medium-high K materials. In this work, novel (Ti 1/2 W 1/2 ) 5+ -substituted LiNb 0.6- x (Ti 1/2 W 1/2 ) x Ti 0.5 O 3 (LNT- x TW, 0 ≤ x ≤ 0.12) ceramics were successfully prepared by the solid-state method. The increase in TW content led to the formation of LNT-0.08 TW ceramic with medium-high K and high Q × f after sintering at 1050 °C. This ceramic also recorded improved characteristics with ε r ∼53.84, Q × f ∼7482 GHz and τ f ∼43.43 ppm/°C related to ionic polarizability, large grains, high densification, and [Ti 2 O 3 ] 2+ / N layers. In addition, Li 2 O–B 2 O 3 –SiO 2 –CaO–Al 2 O 3 (LBSCA) used as an effective sintering aid, improved densification and promoted sintering by not only decreasing the temperature to 900 °C, but also enhancing the microwave dielectric properties with ε r ∼49.46, Q × f ∼8149 GHz, and τ f ∼12.04 ppm/°C. The Q × f value was estimated to 1.15 ∼ 2-fold higher than other LNT-based ceramics within stable τ f . More encouragingly, the LNT-0.08 TW ceramic also showed good chemical match with Ag, suggesting usefulness for miniaturized LTCC devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Luyan Yao,Changming Ke,Jinhua Zhang,Yuanbing Li,Bingqiang Han,Jingran Wang
Ti–Si–Fe alloys extracted from high-titanium blast furnace slag were utilized to replace part of the silicon powders, and then nitride/oxynitride bonded SiC ceramics were prepared by reactive sintering in graphite bed. Ti–Si–Fe alloys could react with CO/N 2 at a low temperature (1200 °C), and the addition of Ti–Si–Fe alloys could reduce the nitriding temperature of Si. Density functional theory calculations suggested that Ti–Si–Fe alloys enhanced reaction activity via weakening the strength of C O and N N bonds. The regional equilibrium phase diagrams of Si–C–N–O and Ti–Si–C–N–O under CO/N 2 atmosphere were calculated by thermodynamics. The change of whiskers morphology was observed by scanning electron microscope. Furthermore, the bulk density, the cold modulus of rupture, and the cold compressive strength improved with Ti–Si–Fe alloys content. The results showed that the addition of Ti–Si–Fe alloys not only significantly promoted nitriding of Si and formation of Si 3 N 4 whiskers, but also improved the mechanical properties of the samples.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
Energy Storage Materials
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2021
·
IF 17.789
Linlin Ma,Li-Juan Yu,Jingchong Liu,Ya-Qiong Su,Shuai Li,Xiaohuan Zang,Tao Meng,Shuaihua Zhang,Jianjun Song,Jiangyan Wang,Xiaoxian Zhao,Zhimin Cui,Nü Wang,Yong Zhao
As the desired sulfur host of lithium-sulfur battery, the strong polarity and fast electron migration capability are indispensable for achieving effective adsorption and conversion of lithium polysulfides (LiPSs), that is, restricting the shuttle effect. Herein a porous microdisk Ti 4 O 7 /TiN/C heterojunction with strong polar N-Ti-O covalent bonds is precisely constructed. Compared with O-Ti-O or N-Ti-N bond in single Ti 4 O 7 or TiN , the N-Ti-O bond with stronger polarity could adsorb and bond with S and Li atoms in LiPSs, which is beneficial for LiPSs adsorption. Beside, the Ti 4 O 7 /TiN heterostructure favors the electron transfer , which could promote the conversion of LiPSs. The design strategy is to construct abundant polar N-Ti-O bonds at Ti 4 O 7 /TiN heterogeneous interface that would realize the associative process of LiPSs adsorption, trapping, and conversion, thereby restraining the shuttle effect efficiently. In the current study, as the host of the sulfur cathode, the porous microdisk TiN/Ti 4 O 7 /C heterojunction exhibits a high specific capacity of 1204.5 mAh g −1 at 0.2 C, and a high specific capacity of 616.5 mAh g −1 at an ultrahigh current density of 4 C. In addition, 86.4% and 116.9% capacity are retained over 1000 cycles at 1 C and 2 C, respectively. This strategy provides an insight into developing lithium-sulfur battery with extraordinary performance, and opens promising routes to design the next-generation electrochemical energy storage devices.
研究领域:
材料科学
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电化学能源存储
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
·
IF 6.364
Qin Sun,Ludong Yang,Wanchun Yang,Hongjun Ji,Mingyu Li,Yufeng Li
Ceramics and metal joinings have been widely employed in aerospace, dental implants , and the electronic packaging industry for fabricating multifunctional components. In this study, the 35Bi 2 O 3 -50B 2 O 3 -15ZnO (mol.%) glass has been employed for joining the ZrO 2 ceramic and Ti-6Al-4V alloy. The effect of brazing temperature on the microstructure evolution, mechanical properties , and bonding mechanism of brazed joints has been analyzed. The microstructure of the ZrO 2 /glass/Ti-6Al-4V joints and the content of Bi 4 B 2 O 9 , Bi 2 O 3 and Bi 24 B 2 O 39 precipitated crystals in glass were found to be dependent on the brazing temperature. The reaction product of Bi 4 Ti 3 O 12 was identified in the glass/Ti-6Al-4V interface because of the chemical reaction between the oxidized layer of Ti-6Al-4V alloy and glass. A maximum shear strength as high as 48.8 ± 5.2 MPa was obtained. Our work, thus, demonstrates that the 35Bi 2 O 3 -50B 2 O 3 -15ZnO glass is an effective bonding material for joining ZrO 2 ceramic and Ti-6Al-4V alloy under low temperature in an ambient atmosphere.
研究领域:
材料科学
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焊接工程
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Chunying Dong,Yuang Pang,Yan Chen,Zhan Gao,Meiqiang Cai,Micong Jin,Zongsu Wei
Sludge based catalysts (SBCs) has been considered as a promising and viable approach to sludge reclamation. Herein, we fabricated bimetallic Fe-Ti doped SBCs via a facile synthesis with sludge containing polyacrylamide (PAM) as N-precursor. The adsorption capacity and degradation efficiency of as-synthesized SBCs were assessed using tetracycline (TC) as a target pollutant, in which PAM in sludge played a dual role by promoting porosity, active sites, and structural defects beneficial for persulfate (PS) activation. Fe-Ti doping induced the activation of PS by a fast redox cycle of Fe 3+ /Fe 2+ associated with the coexistence of Ti 4+ /Ti 3+ , which enabled an efficient electron transfer between the catalyst and PS. The synergistic effect of PAM-derived N doping and Fe-Ti bimetals resulted in prevention of iron leaching and enhanced catalyst stability over a wide pH range. The surface SO 4 •− was the primary oxidant in the TC degradation process based on free-radical quenching experiments, and degradation pathways of TC were proposed given the intermediate evidence from UPLC-HRMS analysis. This study promotes the reclamation of PAM-containing sludge providing an eco-friendly and efficient process to activate PS for wastewater treatments .
研究领域:
环境科学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Liu,Jia-Ji Liang,Wei-Ming Guo,Chao Chang,Xiao-Ming Duan,De-Chang Jia,Hua-Tay Lin
High-temperature thermal stability plays a crucial role in the structural application of pressureless liquid-phase sintered SiC (PLS-SiC) ceramics. In this paper, a PLS-SiC ceramic processed with CeO 2 –Al 2 O 3 as sintering additives with excellent high-temperature thermal stability was achieved by incorporating (Hf, Zr, Ta, Nb, Ti)B 2 (HEB) particles. Results showed that PLS-SiC ceramics with HEB-free underwent a structural change from dense to porous microstructure after annealing at 1800 °C/1 h. Conversely, PLS-SiC ceramics with the addition of 10 vol% HEB exhibited excellent thermal stability, as evidenced by the retention of their dense microstructure after exposure to annealing at 1800 °C/1 h. The possible primary reasons for this significantly different response to the thermal stability could be probably attributed to fact that HEB reacted with CeAlO 3 and SiC to form solid-phase products, subsequently inhibiting the formation of gas-phase products after decomposition of CeAlO 3 alone in a high-temperature vacuum environment. In addition, the formation of a compact protective outer layer containing Hf–Ta containing diboride in PLS-SiC ceramics during the annealing process could effectively hinder the volatilization of volatile substances at a high temperature.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ni Xiong,Rui Bao,Jianhong Yi,Dong Fang,Jingmei Tao,Yichun Liu
CNTs/Cu-Ti composites were fabricated successfully by spray pyrolysis , low energy ball milling and subsequent hot pressing (HP). Microstructure and mechanical properties of the composites were characterized by SEM, EDS, HRTEM , XRD, hardness and tensile tests. The results reveal that in situ generated nano-TiC particles, as a transition phase from CNTs to Cu-Ti matrix, which played a “rivet” role in enhancing the interfacial bonding between the CNTs and Cu-Ti matrix is formed in the composites. Consequently, mechanical properties of the CNTs/Cu-Ti composites are enhanced compared with alloy matrix, and an optimal balance between elevated ultimate tensile strength and impressively larger plastic deformation is achieved by adding 0.4 wt% CNTs in the composites. (ultimate tensile strength (UTS) 352 MPa, elongation 28.2%, the UTS is 39% higher than that of the Cu-Ti alloy, and the ductility increased significantly by 62%.) Finally, strengthening and toughening mechanisms are discussed. This study provides new insights into the interface structure and strength-ductility in metal-matrix composites.
研究领域:
材料科学
·
力学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）