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.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Jinglun Guo,Zhenling Shang,Yue Sun,Chenghao Li,Jianyi Xia,Yuxin Zou,Kang Du,Guoqiang Liu,Feng Zhou,Weimin Liu
Perfluoropolyether (PFPE) lubricant is widely used in plenty of cutting-edge technologies because of its extraordinary properties. However, poor boundary lubrication and creep limit their further applications. Here, we demonstrated a PFPE supramolecular gel with surface-functionalized Ti 3 C 2 T x as additives for highly efficient boundary lubrication and prevention of creep. It turned into an oily liquid at 124.5 °C, accompanied by a rapid decrease in viscosity. Additionally, the phase transition could be achieved by shear stress. This kind of gel reduced wear volume by 90.75% compared with pure PFPE oil. Its friction coefficient (∼0.113) varied slightly with time. Notably, its load-bearing capacity exceeded 1500 N. This work puts forward an approach to the preparation of PFPE-based supramolecular gel lubricant with surface-functionalized Ti 3 C 2 T x additive.
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Wenhu Jia,Huaijie Cao,Tiange Wang,Yulin Min,Qunjie Xu
Two-dimensional (2D) materials show potential applications in anti-corrosion on metals in aggressive medium. However, it remains a challenge in uniform dispersion, complex functionalization, and structure control of 2D nanosheets in composite coatings . Herein, a Ti 3 C 2 T x /layered double hydroxide (LDH) heterostructured coating for corrosion protection on Al alloy is proposed by in situ growth and dip coating process . Without complex functionalization, dispersion, and structure control, the heterostructured coating provides an enhanced corrosion resistance confirmed by electrochemical tests and microstructure characterization . As a result, the incorporation of Ti 3 C 2 T x MXene can decrease the corrosion current density by ~40-fold and increase the coating resistance by 54-fold compared to bare Al alloy. Furthermore, the Ti 3 C 2 T x /LDH coating still exhibits a self-healing ability after immersion in 3.5 wt% NaCl solution over 3 days, thereby providing long-term corrosion protection on Al alloy for 30 days. The protective behavior is attributed to the blocking effect and the feature of participating in electrochemical corrosion reaction and losing electrons of 2D MXene prior to the metal. This strategy provides a facile and effective approach to designing 2D materials-based anticorrosion coatings on Al alloy used in aggressive environments.
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Haifeng Bian,Yanyan Du,Yilun Ren,Hao Wu,Yujie Ma,Beibei Yang,Shaochun Tang,Duan Bin,Hongbin Lu,Xiangkang Meng
Polypyrrole (PPY) coating is promising for the anticorrosion of stainless steel (SS) bipolar plates (BPs) in virtue of its good conductivity and corrosion resistance . However, the poor adhesion and pore defects of pure PPY coating limit its application. In this work, a PPY/Ti 3 C 2 T x MXene composite coating was synthesized on 304SS BPs by one-step electrodeposition , which is a facile method to realize the polymerization of PPY and the doping of MXene at the same time. The PPY/MXene coating exhibits better long-term immersion stability in simulated proton exchange membrane fuel cell (PEMFC) environment than pure PPY. The enhanced corrosion resistance is mainly benefited from the enhanced barrier effect, anodic protection effect and adhesion by the introduction of MXene. Meanwhile, the introduction of MXene significantly improves the conductivity of the coating and decreases the interfacial contact resistance at 1.4 MPa from 108.16 mΩ·cm 2 to 55.24 mΩ·cm 2 .
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 2
·849-858
·
IF 3.094
Fang Xu,Dainan Zhang,Yulong Liao,Gang Wang,Xiaolei Shi,Huaiwu Zhang,Quanjun Xiang
Plasma processing technology, as a promising method to enhance photocatalytic activity of catalyst, is gradually attracting extensive interest from researchers. However, the main mechanism of plasma-treated photocatalyst on hydrogen production is not clear. In this work, 2D Ti 3 C 2 T x MXene is selected as a co-catalyst of graphitic carbon nitride (g-C 3 N 4 ), which carries out a plasma treatment (500°C) under N 2 /H 2 atmosphere. Due to plasma treatment, there is a higher proportion Ti–O functional groups on surface of layered Ti 3 C 2 T x MXene, especially for Ti 4+ . The obtained g-C 3 N 4 /p-Ti 3 C 2 T x photocatalyst with sandwich-like structure shows an enhanced photocatalytic activity. The rate of hydrogen generation of CN/pTC3.0 sample without Pt co-catalyst is 25.4 and 2.4 times that of pure g-C 3 N 4 and CN/TC3.0 samples, respectively. The improved photocatalytic activity is attributed to presence of Ti 4+ due to plasma treatment, which can capture photo-induced electron from g-C 3 N 4 and improve the separation of electrons and holes after visible light irradiation. The cyclic hydrogen production of the photocatalyst demonstrates good photocatalytic stability. In addition, this method of plasma treatment under N 2 /H 2 atmosphere is feasible to develop a high-performance co-catalyst, which can be extended to other photocatalysts with two-dimensional structure for photocatalytic water-splitting applications.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 46
·1905694
·
IF 15.621
Lin Yang,Chunxiang Dall'Agnese,Yohan Dall'Agnese,Gang Chen,Yu Gao,Yoshitaka Sanehira,Ajay Kumar Jena,Xiao-Feng Wang,Yury Gogotsi,Tsutomu Miyasaka
MXenes are a large and rapidly expanding family of 2D materials that, owing to their unique optoelectronic properties and tunable surface termination, find a wide range of applications including energy storage and energy conversion. In this work, Ti 3 C 2 T x MXene nanosheets are applied as a novel type of electron transport layer (ETL) in low-temperature processed planar-structured perovskite solar cells (PSCs). Interestingly, simple UV-ozone treatment of the metallic Ti 3 C 2 T x that increases the surface Ti O bonds without any change in its bulk properties such as high electron mobility improves its suitability as an ETL. Improved electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency (PCE) from 5.00% in the case of Ti 3 C 2 T x without UV-ozone treatment to the champion PCE of 17.17%, achieved using the Ti 3 C 2 T x film after 30 min of UV-ozone treatment. As the first report on the use of pure MXene layer as an ETL in PSCs, this work shows the great potential of MXenes to be used in PSCs and displays their promise for applications in photovoltaic technology in general.
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POLYMER COMPOSITES
·
2019
·Vol. 41
·期 1
·210-218
·
IF 2.268
Ying Pan,Li Fu,Qingwei Zhou,Zhenan Wen,Cheng-Te Lin,Jinhong Yu,Weiming Wang,Hongting Zhao
Herein, Ti 3 C 2 T x (MXene) was synthesized and mixed with polyvinyl alcohol (PVA) to fabricate PVA/MXene nanocomposites. The results confirmed that delaminated MXene was successfully synthesized. The nanocomposites were obtained via casting/evaporation method. The thermal stability was evaluated by thermogravimetric analysis (TGA). For the PVA composites with content of 2 wt% MXene (PVA-MXene2), the thermal decomposition was retarded by approximately 20°C when the temperature was lower than 350°C compared with that of pure PVA. Moreover, the evolved gas products of the PVA/MXene composite were lower than those of pure PVA. For the first time, the flame retardancy of PVA/MXene nanocomposite was investigated using a microscale combustion calorimeter. The peak heat release rate (PHRR) and total heat release of the PVA composite were reduced by 25.7% and 25.5%, respectively, with 1 wt% of MXene. The temperatures at PHRR of PVA/MXene composites were improved with the addition of MXene. Moreover, the addition of MXene resulted in PVA composites with a higher tensile strength and elongation at break than those of a pure PVA film. The improvements in the flame retardancy, thermal and mechanical properties of PVA/MXene composites should enable a wide range of potential applications of MXenes in polymer matrices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Meihong Fan,Lijia Liu,Yue Li,Fengyun Gu,Xingquan He,Hui Chen
The industrialization of hydrogen production technology through polymer electrolyte membrane water splitting faces challenges due to high iridium (Ir) loading on the anode catalyst layer. While rational design of oxygen evolution reaction (OER) electrocatalysts aimed at effective iridium utilization is promising, it remains a challenging task. Herein, we present exfoliated Ti 3 C 2 T x MXene as a highly conductive and corrosion-resistant support for acidic OER. We develop an alcohol reduction method to achieve uniform and dense loading of ultrafine Ir nanoparticles on the MXene surface. The IrO 2 /TiO x heterointerface is formed in situ on the Ir@Ti 3 C 2 T x MXene surface, acting as a catalytically active phase for OER during electrocatalysis. The electron interactions at the IrO 2 /TiO x heterointerface create electron-rich Ir sites, which reduce the adsorption properties of oxygen intermediates and enhance intrinsic OER activity. Consequently, the prepared Ir@Ti 3 C 2 T x exhibits a mass activity that is 7 times greater than that of the benchmark IrO 2 catalyst for OER in acidic media. In addition, the /Ti 3 C 2 T x MXene support can stabilize the Ir nanoparticles, so that the stability number of Ir@Ti 3 C 2 T x MXene is about 2.4 times higher than that of the IrO 2 catalyst.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Xu-Han Chen,Cheng-Zhen Wang,Qiu-Feng Lü
The rapid growth of industries and population has led to severe water pollution, especially from the oil and dyes pollution. Recently, MXene with hydrophilicity layer structure and excellent adsorption capacity has been regarded as a promising material for high efficiency dye adsorption and oil–water separation. In this study, aminated-SiO 2 nanorods and monolayer Ti 3 C 2 T x MXene were combined by a facile self-assembly method to prepare a new composite (NS x /MXene) for dye adsorption and oil–water separation. The results show that the adsorption capacity of the NS x /MXene composite was enhanced due to the introduction of aminated-SiO 2 nanorods with more active sites. Especially, the NS 2 /MXene composite has a maximum adsorption capacity up to 4532.5 mg g −1 for AB74 dye, which is attributed to the electrostatic interaction between NS 2 /MXene and AB74 dye molecules. In addition, NS 2 /MXene modified polyurethane sponge (NS 2 /MXene@PU) was prepared by immersing dried polyurethane (PU) sponge in the NS 2 /MXene suspension. The NS 2 /MXene@PU sponge has a characteristic of superhydrophilicity in air and superoleophobicity in water, and shows a high separation flux of 27.44 × 10 4 L m −2 h −1 for a cyclohexane-water mixture. After 30 cycle experiments, the separation flux of NS 2 /MXene@PU for the cyclohexane-water mixture can still be 21.66 × 10 4 L m −2 h −1 , indicating an excellent cycling stability of NS 2 /MXene@PU. Hence, this new NS 2 /MXene material has excellent application prospects in dye adsorption and oil–water separation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xuan Ding,Tingxi Li
Because of electromagnetic wave pollution, there is a growing need for electromagnetic wave absorption materials. An effective strategy is to optimize their microstructure and composition. In this study, hollow polypyrrole (PPy) nanocubes (HP) are synthesized using zeolitic imidazolate frameworks (ZIFs) as sacrificial templates. Subsequently, HP/Ti 3 C 2 T x MXene (HPM) composites are fabricated through electrostatic self-assembly and freeze-drying methods. The resulting 3D conductive network and numerous heterogeneous interfaces enhance interfacial polarization, and the hollow morphology facilitates electromagnetic wave multiple reflections, thereby significantly improving electromagnetic wave absorption performance. HPM-2 realizes a minimum reflection loss (RL min ) of −53.45 dB and an effective absorption bandwidth (EAB) of 6.52 GHz at 1.84 mm. HPM-3 achieves a RL min of −72.28 dB at 2.75 nm and an EAB of 4.7 GHz at 1.61 mm. Moreover, the simulation procedures are applied to investigate the radar cross-section (RCS) attenuation. It is worth noting that with a detection angle (θ) of 0°, HPM-3 possesses a maximum RCS reduction of 35.19 dB m². This work presents a straightforward method for preparing HPM composites and lays the foundation for exploring the efficient electromagnetic wave absorption properties of conducting polymer and MXene-based composites and their derivatives.
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ACS Nano
·
2025
·
IF 16
Ruosong Li,Youpeng Huangfu,Lulu Liu,Jiashun Hu,Dan Zeng,Yichen Wang,Daidi Fan,Rui Zhang,Biao Zhao
Interlayer and defect engineering significantly affects the electrical conductivity and electromagnetic interference (EMI) shielding of Ti3C2Tx MXene. Previous studies have prioritized the size of the intercalant over its synergy with chemical affinity, limiting the elucidation of the intercalation mechanism and the precise control of the interlayer spacing (d-spacing). Herein, we synthesize MXene aerogels with a tunable d-spacing and defect density using a series of amine molecules of different sizes and chemical affinities as intercalants and cross-linkers. Particularly, the intercalation of p-phenylenediamine (PPD) increases the d-spacing of MXene from 0.960 to 1.642 nm. Simultaneously, the increased d-spacing contributes to an increased defect density within the Ti–Ti layer. Hence, the PPD@MXene aerogel exhibits reduced surface electric field intensity and increased internal polarization loss, resulting in absorption-dominated EMI shielding. The absorptivity reaches 0.92, far exceeding the reported shielding materials, with a shielding effectiveness of 50.4 dB. This study provides a theoretical foundation and preliminary guidance for the development of interlayer-engineered MXene shielding materials.
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2025
·
IF 2.9
Yang He,Guowei Chen,Yiping Zhao,Li Chen
The hydrophilicity of two-dimensional (2D) transition-metal carbides, carbonitrides, and nitrides (MXene) nanochannels plays a critical role in water transport during filtration, yet its specific effects on MXene membranes remain inadequately understood. Herein, we systematically investigated water transport through Ti3C2TX MXene nanochannels using molecular dynamics simulations coupled with experimental validation, addressing a significant knowledge gap in MXene-based separation membranes. Our simulations demonstrated that strong interactions between water molecules and hydrophilic nanochannel MXene surfaces (Ti3C2(OH)2 MXene or Ti3C2(NH)2 MXene) facilitated the formation of ordered molecular arrangements, substantially improving water permeability. Conversely, hydrophobic nanochannels (Ti3C2O2 MXene or Ti3C2F2 MXene) exhibited disordered water molecule distributions, leading to reduced permeability. Experimental validation corroborated these simulation results, demonstrating a direct correlation between the hydrophilicity of the Ti3C2TX surface and the water flux. The highly hydrophilic Ti3C2(OH)2 MXenes exhibited water flux maximum, whereas the more hydrophobic Ti3C2F2 MXenes had the lowest water flux. By integrating molecular dynamics simulations with experimental analyses, we gained comprehensive insights into the influence of nanochannel hydrophilicity on water transport mechanisms in MXene membranes. These findings provide critical guidelines for designing high-performance MXene-based membranes for advanced water treatment and separation applications.
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