ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Yuxuan Zhang,Jun Luo,Biao Feng,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Mu Naushad,Bin Gao,Hongqiang Ren
MXenes are considered as an emerging class of two-dimensional (2D) adsorbent for various environmental applications. In this work, two different morphologies of Ti 3 C 2 T x MXene (multilayer (ML-Ti 3 C 2 T x ) and delaminated titanium carbide (DL-Ti 3 C 2 T x )) were prepared through mild in situ HF etching and further delamination . The structural differences between the two were explored with a focus on their effects on the performance and mechanism of removing heavy metals from water. In comparison to ML-Ti 3 C 2 T x , DL-Ti 3 C 2 T x had more oxygen-containing functional groups, higher specific surface area (19.713 vs. 8.243 m 2 /g), larger pore volume (0.135 vs. 0.040 cm 3 /g), higher maximum Pb(II) adsorption capacity (77.0 vs. 56.68 mg/g), but lower maximum Cu(II) adsorption capacity (23.08 vs. 55.46 mg/g). Further investigation revealed that the removal of Pb(II) by the MXenes was mainly controlled through electrostatic attraction and surface complexation mechanisms, while Cu(II) was removed mainly through surface reduction by Ti-related groups. Because delamination of ML-Ti 3 C 2 T x increased the surface area and surface functional groups, DL-Ti 3 C 2 T x became a better sorbent for Pb(II) in water. During sonication, however, delamination inevitably led to partial oxidation of Ti 3 C 2 T x nanosheets and thus weakened the reducing ability of DL-Ti 3 C 2 T x for Cu(II) in water. Nevertheless, both ML- and DL-Ti 3 C 2 T x not only exhibited excellent heavy metal adsorption capacity under different solution conditions, but also showed good reusability. Findings of this study indicate that Ti 3 C 2 T x MXenes are promising adsorbents for treating heavy metal pollutants in water.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 24
·16438-16445
·
IF 3.3
Zhiwei Yang,Lijuan Dong,Qian Chen,Zeyi Wang,Jiacheng Cao,Mengwei Dong,Jian Wang,Jian Zhang,Xiao Huang
Although titanium-based MXenes have been widely reported for gas sensing, the effect of crystal stoichiometric variations on the sensing properties has been rarely reported. Herein, stoichiometric polymorphs of titanium carbide MXenes (i.e., Ti3C2Tx and Ti2CTx) loaded with Pd nanodots (NDs) prepared by photochemical reduction were investigated for room-temperature H2 sensing. Interestingly, we found that Pd/Ti2CTx exhibited greatly enhanced sensitivity to H2, along with faster response and recovery rates compared to Pd/Ti3C2Tx. The H2 adsorption induced resistance change in Pd/Ti2CTx was higher than that of Pd/Ti3C2Tx due to the more effective charge transfer at the heterointerface of Pd/Ti2CTx, which was confirmed by shifts of binding energies and theoretical calculation results. We hope this work could be helpful to design more high-performance MXene-based gas sensors.
研究领域:
材料科学
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传感器技术
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表面化学
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产品关联
DOI
PubMed
高影响因子
Journal of Advanced Dielectrics
·
2018
·
IF 0
Yi Tang,Chenhui Yang,Wenxiu Que
Herein, we report on a novel two-dimensional (2D) material application, which shows that an accordion-like layered Ti 3 C 2 nanomaterial (MXene) with an excellent adsorption capacity of Cr(VI) from aqueous solution was prepared by etching Al layer from Ti 3 AlC 2 phase in hydrofluoric acid (HF) solution. Ti 3 C 2 nanopowders were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the physical property of as-obtained samples was studied by UV–Vis diffuse reflectance spectra (DRS). After HF treatment, Ti 3 AlC 2 not only has a phase transition from one crystal to another, but surprisingly, its microstructure is also undergoing an obvious change. Ti 3 C 2 with product of change possesses an accordion-like multilayer structure, and a relatively higher specific surface area (SSA) than untreated Ti 3 AlC 2 . Then, accordion-like Ti 3 C 2 with a high SSA provides abundant active sites for pollutant removal and functionalization. Accordion-like Ti 3 C 2 nanomaterial exhibits a stable adsorption capacity, and 1 g as-prepared accordion-like Ti 3 C 2 powders can remove about 80 mg potassium dichromate. Therefore, the results suggest that 2D MXenes are promising as an effective nanoadsorbent in heavy metal removal from the wastewater.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Si Guo,Chao Deng,Gang Shi,Dawei Wang,Likui Wang
MXenes are emerging as highly promising materials for pseudocapacitive applications, offering exceptionally high specific capacitance. To date, over 30 distinct MXene compositions and nearly 20 solid solutions have been synthesized in the lab. However, research predominantly centers on Ti3C2Tx and a handful of other single-metal MXenes, with scant attention paid to solid-solution MXenes. Herein, a series of solid solution MAX phases (Nb1−yTiy)4AlC3 and corresponding (Nb1−yTiy)4C3Tx MXenes have been synthesized. The maximum proportion of Ti that can be incorporated into the M site has been examined. We found that the rate performance of MXenes improves with increasing Ti content. Especially, (Nb0.7Ti0.3)4C3Tx and (Nb0.6Ti0.4)4C3Tx retain 62.92% and 68.38% of their capacitances, when the scan rate is increased from 5 mV s−1 to 1000 mV s−1, respectively, compared to Nb4C3Tx's 13.88% retention. (Nb0.7Ti0.3)4C3Tx shows a specific capacitance of 311.06 F g−1 under a current density of 1 A g−1 and good cycling stability. This research demonstrates that the electrochemical characteristics of (Nb1−yTiy)4C3Tx solid solution MXenes can be manipulated by adjusting the ratio of transition metals.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 17
·期 1
·167
·
IF 2.468
Linfeng Jin,Liyuan Chai,Weichun Yang,Haiying Wang,Liyuan Zhang
Titanium carbides (MXenes) are promising multifunctional materials. However, the negative surface charge and layer-by-layer restacking of MXenes severely restrict their application in the field of anionic pollutants, including in hexavalent chromium (Cr(VI)). Herein, Ti3C2TxMXenes was functionalized through in situ polymerization and intercalation of poly(m-phenylenediamine) (PmPD), then Ti3C2Tx/PmPD composites were obtained. Delightedly, Ti3C2Tx/PmPD composites exhibited positive surface charge, expanded interlayer spacing, and enhanced hydrophobicity. Furthermore, the specific surface area of Ti3C2Tx/PmPD composite was five and 23 times that of Ti3C2Txand PmPD, respectively. These advantages endowed Ti3C2Tx/PmPD composite with an excellent adsorption capacity of Cr(VI) (540.47 mg g−1), which was superior to PmPD (384.73 mg g−1), Ti3C2TxMXene (137.45 mg g−1), and the reported MXene-based adsorbents. The Cr(VI) removal mechanism mainly involved electrostatic adsorption, reduction, and chelation interaction. This study developed a simple functionalization strategy, which would greatly explore the potential of MXenes in the field of anionic pollutants.Keywords:titanium carbides;functionalization;polymerization;hexavalent chromium;adsorption
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Tongkun Zhao,Jiakui Zhang,Zheng Du,Yahua Liu,Guoli Zhou,Jingtao Wang
Two-dimensional transition metal carbides, MXenes, with large surface area, excellent electrical conductivity and chemical stability, have proved promising for energy storage. However, the irreversible re-stacking and low capacity of MXenes restrict their development and practical applications. Here, the N-doped carbon decorated MXene (Ti 3 C 2 T x @NC) composites were synthesized via an in-situ self-polymerization of dopamine on the surface of Ti 3 C 2 T x followed by a carbonization process. The Ti 3 C 2 T x and Ti 3 C 2 T x @NC were systematically characterized, which have been manifested that NC were equably decorated on the surface and interlayer of Ti 3 C 2 T x sheets and a unique three-dimensional composited nanostructure was fabricated. Such nanostructure can confer both high surface area of NC layer and effective avoidance of the restacking of Ti 3 C 2 T x sheets, whilst, importantly, rendering the composites good conductivity and additional pseudocapacitance. As a result, the optimized Ti 3 C 2 T x @NC-2 composite exhibited a high specific capacitance of 442.2 F g −1 under a current density of 1 A g −1 , which is 281% higher than that of Ti 3 C 2 T x . As a further description, Ti 3 C 2 T x @NC achieved an excellent cycling stability with capacitance retaining 91.9% after 5000 cycles and a high rate capability of 92.5% at 10 A g −1 . Besides, the Ti 3 C 2 T x @NC-2-based symmetric supercapacitor presents a delighted energy density and power density. Therefore, the elaborately designed Ti 3 C 2 T x @NC composites provided a pregnant exploration for energy-related applications.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 33
·21600-21608
·
IF 4.036
Jinxin Cao,Yuru Wang,Bingqing Wei,Jiaxin Ye,Qing Zhang
Changing the morphology of two-dimensional materials often offers an efficient and effective means to exploit their electronic and mechanical properties. Two-dimensional materials such as graphene can be scrolled into one-dimensional fibers via simple sonication. Unfortunately, scrolling MXene nanosheets into fibers is quite challenging, especially Ti3C2Tx composed of three layers of titanium atoms and two layers of carbon atoms. Herein, we report a new method to fabricate MXene fibers via ascorbic acid (AA) induced scrolling of Ti3C2Tx nanosheets. An unusual AA-Ti3C2Tx interaction is discovered in that intercalated AA molecules bind to and interact with the Ti3C2Tx surface in the form of a hydrogen bonding-bonded assembly instead of as individual molecules, and a sheet-scrolling mechanism is proposed based on this interaction. The as-obtained MXene fibers exhibit a compact cross-section, and the diameter can be tailored from hundreds of nanometers to several micrometers through tuning the MXene/AA ratio. Moreover, the storage modulus of the MXene-fiber sponge attains its maximum value of ∼1 MPa when a unique morphology comprising both fibers and not-yet-scrolled sheets is presented. This work offers a new strategy of fiber-shaping MXenes for applications in structural composites and flexible electronics.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Processes
·
2024
·Vol. 12
·期 1
·102
·
IF 2.8
Tingting Lv,Fang Tian,Tu Hu
Titanium carbide has attracted widespread attention due to its excellent properties. This study investigates the process of carbon thermally reducing TiO2to prepare TiC through a combination of thermodynamic analysis and experiments. The effects of temperature, TiO2/C molar ratio, and time on the phase transformation and morphology evolution of the products are investigated. The synthesis of titanium carbide involves the main reduction path of TiO2–Magnéli–Ti3O5–Ti2O3–TiCxO1−x. With the increase in reaction temperature and TiC content, the microstructure transitions from a smooth disc-like structure to a loose and porous layered structure, while the particle size decreases significantly. The carburisation rate of the reduced product is more affected by temperature, according to chemical analysis. The carburisation rate increased from 18.37% to 36.09% for 2 h–10 h of holding time at 1400 °C, and from 51.43% to 77.57% for 2 h–10 h of holding time at 1500 °C. The quantification of the carburisation rate provides a valuable reference for the preparation of titanium carbide by TiO2.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Long Han,Mengmeng Xu,Hairui Wang,Hongyu Zhang,Jing Hua,Chengzhong Zong
The loading of antioxidants onto inorganic fillers is a vital method for preventing the migration of rubber antioxidants. However, the loading rate is not ideal, which has been a persistent problem for scholars in this field. In this work, the mussel-based strategy was used to coat titanium carbide (Ti 3 C 2 ) surfaces with polydopamine (PDA). The amino group on the antioxidant 4-aminodiphenylamine (RT) is opened with the epoxy group on the silane coupling agent KH560, while the phenol hydroxyl group of PDA condenses with the silanol group on KH560 to prepare titanium carbide-supported antioxidant molecules (Ti 3 C 2 -RT). The layered Ti 3 C 2 dispersed in the matrix material not only effectively prevents oxygen from entering, but also provides a large specific surface area for the supported antioxidant. At the same time, the introduction of high-functionality polyamines and silane coupling agents creates conditions for the preparation of inorganic fillers with high loading rates of antioxidants. The loading rate of Ti 3 C 2 -RT was evaluated by TGA, and the mass fraction of antioxidant RT on Ti 3 C 2 -RT was approximately 16.5%, which means that it has the highest loading rate in the field of inorganic fillers loaded with antioxidants. In addition, the mechanical properties of polybutadiene rubber before and after aging were also studied. The test results show that the new antioxidant Ti 3 C 2 -RT has good anti-aging effect and can effectively prevent antioxidant precipitation. Therefore, compared to organic antioxidants, the supported antioxidant Ti 3 C 2 -RT has a longer ability to scavenge free radicals, resulting in a longer service life of rubber products.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2019
·Vol. 125
·期 16
·
IF 2.328
Wang Zhiwei,Kou Zili,Zhang Yuanfen,Yang Ming,Gong Hongxia,Liang Hao,Huo Ruizhi,Guan Shixue,Yin Xiaoshuang,He Duanwei
The influence of sintering pressure on the mechanical properties of bulk titanium carbide (TiC) fabricated through work hardening at high pressure and high temperature is investigated systematically. A series of pure polycrystalline TiC samples are prepared by sintering micrometer-sized TiC powders at a pressure of 9.0–14.0 GPa and a temperature of 1500 °C. These samples are then characterized by various techniques for determining their residual stress, grain size, density, microstructural defects, hardness, and fracture toughness. The results demonstrate that the Vickers hardness H V and the fracture toughness K IC depend strongly on the sintering pressure. It is found that the mechanical properties of the sintered samples improve with increasing sintering pressure. The relative density increases with increasing sintering pressure, reaching near full density at 14.0 GPa. The hardness and fracture toughness of the sample sintered at 1500 °C at 14.0 GPa pressure are 31.2 GPa and 4.2 MPa m 1/2 , respectively. The high-pressure and high-temperature environment causes severe plastic deformation of the grains, as well as a high density of dislocations, resulting in a dislocation pileup. The latter, together with the production of defects such as sub-boundaries and stacking faults, provides strengthening and stabilizing effects and improves the material hardness.
研究领域:
材料科学
·
力学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yangyang Shi,Fengyi Yang,Li Tao
Developing electrocatalysts based on transition-metal carbides that can be utilized for commercial water splitting is a challenging endeavor. To address this challenge, we employed a novel approach that merged phase-inversion tape-casting and sintering, subsequently implementing a simple and efficient electrodeposition process, to synthesize Ni-activated and Ni–P-activated titanium carbide (Ni/TiC, Ni–P/TiC) ceramic electrodes as water splitting catalytic cathodes and anodes. These self-supported Ni/TiC and Ni–P/TiC electrodes are binder-free with abundant finger-like pores, which contribute to the formation of highly conductive skeleton and more exposed active sites for direct water splitting. These catalysts exhibit outstanding performance, superior to many reported bifunctional nickel-based catalysts supported on other substrates. Moreover, the exceptional electrocatalytic performance of the Ni/TiC and Ni–P/TiC catalysts is attributed to the synergistic effect between Ni oxides (phosphides) and TiC, as revealed by density functional theory (DFT) calculations. This self-template strategy paves the way for fabricating industrially applicable electrodes to generate hydrogen and oxygen through water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xue Gao,Zhong-Kun Li,Jian Xue,Yong Qian,Li-Zhi Zhang,Jürgen Caro,Haihui Wang
Highly effective air filters are needed because of the increasing harm caused by air particulate matter pollution. Herein, two-dimensional titanium carbide Ti 3 C 2 T x MXene nanosheets with active surface-terminating groups (O, OH and F) were used to modify the polyacrylonitrile (PAN) nanofiber filters to strengthen their interaction force with PM2.5 . These forces were measured quantitatively through the force-distance curve-based AFM showing that the MXene modification of the PAN fiber induces three times larger interaction forces than before. The obtained filters show high PM2.5 removal efficiency of ∼99.7% with a low pressure drop of ∼42 Pa. Moreover, the presence of MXene nanosheets strongly inhibits the propagation of bacteria (e.g. E. coli and S. aureus ) in the filters. Such filters can significantly improve air quality, especially in public places such as hospitals.
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）