SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yiling Zheng,Hongli Zhang,Shuwen Yu,Hongwei Zhou,Weixing Chen,Jie Yang
Two-dimensional (2D) MXene-based membranes combine unique atomic thickness, well-arranged interlayer channel, and have received growing attention in molecular/ion separation and transport. The low permeability and instability of MXene-based membranes in water purification enable it difficult to be utilized in practical processing. Here, we present a high water-permeability and long-lived MXene membrane by assembling 2D heterostructured MXene/COF flakes on macroporous polymeric support. The intercalation of COFs into the interlayer of Ti 3 C 2 T x nanosheets not only increases the adjacent interlayer space , but also provides abundant molecular sieving pores, thereby enhancing the permeability of MXene membrane. While being applied in removal of organic dyes, the MXene/COF hybrid membrane exhibits a superior water permeance (up to ∼ 300 L m −2 h −1 bar −1 ), and several satisfactorily rejections for different dyes (98.2% for congo red, 98.7% for chrome black T, 96.4% for methyl blue, and 97.2% for methyl orange) are simultaneously achieved. Additionally, the covalent anchoring of COFs on MXene surface can greatly improve the stability. The reduction of hydrophilicity of MXene surface mitigates water molecular absorption on the fluid channel wall and endow the membrane with well swell tolerance in aqueous environment. Such high performance MXene/COF hybrid membrane is mainly caused by the physical sieving mechanism supported by the repulsive interaction, as well as adsorption capability originating from porous COFs. This work provides an alternative approach for the fabrication of high performance MXene-based membranes used for highly effective dye wastewater treatment , and extends the application of 2D membranes in desalination , pollutant treatments, and resource recovery.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chunyu Li,Mengqing Zhou,Congling Shi,Xiaodong Qian,Lian Yin,Keqing Zhou
It remains a huge challenge to clean leaks of oil and various organic solvents quickly and efficiently, especially for special conditions such as high-viscosity oils, corrosion from acid/alkali solutions, high-temperature damage, and fire risk. The adsorbents with a three-dimensional porous structure and excellent resilience have been recognized as prospective candidates for dealing with oil–water separation problems. In this study, solar responsive and multifunctional polyurethane foams were successfully fabricated by compounding photothermal and hydrophobic components by both internal and external means. Due to the interface adhesion, polydopamine/MXene nanosheet/polyaniline/polydimethylsiloxane polyurethane (PMPP–PU) foams prepared by introducing PDA/MXene nanoparticles and phytic acid (PA)/PANI micronano coatings exhibited a high adsorption capacity up to 61.4 g/g for different kinds of low-viscosity organic solvents. Driven by 1 kW/m2 illumination intensity, the adsorption capacity of PMPP–PU for high-viscosity oil increased to 29.4 g/g, realizing a 203% rise compared to pure PU. Also, the modified foams achieved rapid extrusion and cyclic adsorption of adsorbed solvents, and PMPP–PU showed an adsorption efficiency of close to 90% after 20 cycles. Besides, the prepared adsorbent foams remained persistent and maintained stable hydrophobicity under extreme environmental conditions and were not significantly damaged even by fire attack. This work presents a competitive strategy for the separation and recovery of low-viscosity organic solvents and high-viscosity oils.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Zhuo-Hao Wu,Meidi Wang,Yu-Xin Ren,Shuang Li,Xing-Yu Liu,Yu Cao,Xue-Qian Wu,Guangtong Hai,Zhongyi Jiang,Dong-Sheng Li
Covalent organic framework (COF) membranes are envisioned as promising materials for precise molecular separations. The manipulation of interlayer spacing to offer additional mass transfer channels in COF membranes may be an effective way towards high-flux separation processes but still challenging. Herein, the COF membranes with 1D/2D mixed-dimensional channels are explored by the intercalation of MXene for high-flux dye separations. Thereinto, porous TpPa-SO 3 H nanosheets offer the 1D in-plane channels, and smaller-sized Ti 3 C 2 T x -NH 2 nanosheets serve as the intercalators to generate 2D interlayer channels. By tuning the content of Ti 3 C 2 T x -NH 2 , the interlayer spacing is enlarged from 0.32 nm to 0.46 nm, affording low diffusion energy barrier and ultrafast diffusion kinetics. Compared to the pristine TpPa-SO 3 H membrane, the COF/Mx-8 membrane exhibits an 90 % increase in water flux to 375.8 L m −2 h −1 bar −1 , while maintaining high rejections toward various dye molecules. The strategy of MXene-intercalated mixed-dimensional channels is suitable for diverse types of 2D COF membranes.
研究领域:
材料科学
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分离技术
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
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IF 4.326
Haiyang Li,Xuanhe Ru,Ying Song,Huanping Wang,Chenhui Yang,Shuirong Zheng,Lei Gong,Xiaoguang Zhang,Hongji Duan,Zhenguo Liu,Qiuyu Zhang,Yanhui Chen
There is a pressing demand for efficient electromagnetic interference (EMI) shielding materials with strong electromagnetic wave absorption and low reflection for the protection of next-generation communication technologies and wearable electronic devices. In this work, silicone rubber/MXene/Fe3O4 (SRMF) composites with a sandwich-like structure were fabricated using vacuum-assisted dipping and curing. The top and bottom layers of the SRMF composites are magnetic layers containing Fe3O4 particles and silicone rubber (SR), while the middle layer is a 3D conductive network of MXene aerogel film and SR. This sandwich-like structure enables the composites to effectively shield incident electromagnetic waves and improve the absorption of electromagnetic waves through a mechanism of “absorption–reflection–reabsorption”. The electromagnetic shielding performance of a sandwich-structured SR composite containing 1.2 wt % MXene and 20 wt % Fe3O4 reached 55.5 dB, which was higher than that of a blended SRM1.2F20b composite containing the same proportion of MXene and Fe3O4 (23.1 dB), while the power coefficient of reflectivity was 0.65. The SRMF composites also retained their EMI shielding performance after 1000 bending cycles and displayed good tensile strength. These flexible SRMF composites have broad application prospects in the field of electromagnetic protection of wearable 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
Materials Research Express
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2025
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IF 2.2
Jiale Huang,Zhiyin Cai,Jingjin Cai,Chengming Yu,Shanglin Xiang,Dongyu Cai
Printing technologies have enabled the low-cost and large-scale production of MXene-based transparent
conductive electrodes. Fabrication of inks with MXene monolayers in liquid phase for printing requires
bespoke centrifugation separation, and yield is low. MXene sediment, a byproduct of the centrifugation
separation process, is a rich source for creating concentrated MXene inks. However, removing impurities,
particularly lithium fluoride, from sediment remains a significant challenge for producing high-quality
inks. This study reported the first purification route for removing lithium fluoride from sediment by
controlling the addition of lithium fluoride during the etching of MAX precursors. This resulted in a
concentrated ink that produced large MXene monolayers. The vacuum filtered film had an ultra-high
conductivity of over 20000 S/cm. Gravure printing produced a TCE with a low sheet resistance of 560
Ω/sq and 84% transmittance, eliminating the need for annealing post-treatment.
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 COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yousen Wu,Ying Wang,Guozhe Sui,Dongxuan Guo,Dawei Chu,Guang Xu,Jinlong Li,Yue Li,Dong-Feng Chai
Nowadays, the inherent re-stacking nature and weak d-p hybridization orbital interactions within MXene remains significant challenges in the field of electrocatalytic water splitting, leading to unsatisfactory electrocatalytic activity and cycling stability. Herein, this work aims to address these challenges and improve electrocatalytic performance by utilizing cobalt nanoparticles intercalation coupled with enhanced π-donation effect. Specifically, cobalt nanoparticles are integrated into V 2 C MXene nanosheets to mitigate the re-stacking issue. Meanwhile, a notable charge redistribution from cobalt to vanadium elevates orbital levels, reduces π*-antibonding orbital occupancy and alleviates Jahn-Teller distortion. Doping with tellurium induces localized electric field rearrangement resulting from the changes in electron cloud density. As a result, Co-V 2 C MXene-Te acquires desirable activity for hydrogen evolution reaction and oxygen evolution reaction with the overpotential of 80.8 mV and 287.7 mV, respectively, at the current density of −10 mA cm −2 and 10 mA cm −2 . The overall water splitting device achieves an impressive low cell voltage requirement of 1.51 V to obtain 10 mA cm −2 . Overall, this work could offer a promising solution when facing the re-stacking issue and weak d-p hybridization orbital interactions of MXene, furnishing a high-performance electrocatalyst with favorable electrocatalytic activity and cycling stability.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 18
·e202305086
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IF 1.9
XuKun Qian,ZeFeng Zhao,RuiHua Zhang,ChangBai Yu
Graphical The adsorption capacity of Pb(II) ion for accordion-like Ti 3 CN Mxene is significantly increased after alkalization treatment. The maximum adsorption capacity of the alkalized Ti 3 CN MXene is up to 87.4 mg ⋅ g −1 , and the adsorption ratio reaches 96.6 %. The adsorption process is mainly controlled by chemical adsorption and belongs to surface monolayer adsorption. The presence of poisonous Pb(II) ions in water resources has raised global health concerns. Herein, the adsorption performance of accordion-like Ti 3 CN MXene for Pb(II) ions was investigated for the first time. Batch experiments were carried out by varying modifications, pH values, initial Pb(II) concentrations, adsorption time and temperatures. The results prove that the alkalized-Ti 3 CN shows enhanced adsorption performance. Although the temperature effect is insignificant, the Pb(II) adsorption is strongly pH-dependent. The maximum Pb(II) adsorption capacity of alkalized −Ti 3 CN is about 2.5 times higher than that of activated carbon. The adsorption ratio of Pb(II) is up to 96.6 %. The adsorption capacity increases with increasing the initial concentration of Pb(II). The alkalized-Ti 3 CN adsorbs Pb(II) very quickly and the adsorption equilibrium is nearly achieved within 70 minutes. The adsorption follows the quasi-second-order kinetic model as well as the Langmuir model, and is mainly controlled by chemical adsorption. It is preliminarily concluded that Pb(II) replaces Na(I) of the −ONa functional groups on the alkalized-Ti 3 CN surfaces. This study proves the alkalized-Ti 3 CN MXene has potential application for the purification treatment of wastewater contaminated with Pb(II) ions.
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
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Bingbing Xu,Yue Zhang,Jia Li,Boxiang Wang,Ruoxin Li,Dehong Cheng,Guangtao Chang
Conductive hydrogels have attracted intensive attention for their promising applications in flexible electronics, sensors, and electronic skins. However, extremely poor adaptability under cold or dry environmental conditions along with inferior repairability seriously hinders the development of hydrogels in wearable electronics. Here, a triple network conductive hydrogel (PBCP A -MXene) was prepared by proportionally mixing polyvinyl alcohol (PVA), borax, chitosan (CS), phytic acid (PA), and MXene. The prepared triple network hydrogels composed of robust chitosan polysaccharide as the first network, tough PVA biopolymer gel as the second network, and MXene nanosheets as the third network. Facilitated by triple networks, multiple hydrogen bonds, and electrostatic interactions of CS and PA, the obtained hydrogels not only exhibited outstanding mechanical properties (tensile strain of ∼1580 %, stress of ∼280 kPa) and electrical properties (∼ 2.72 S/m), but also possessed excellent self-healing, self-adhesion, anti-freezing and anti-drying properties. This work presents a strategy for the development of biopolysaccharide hydrogels for applications in the field of sensors.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Lu Tang,Kechen Zhou,Huiyu Su,Jiahong Tang,Qirui Wu,Lingfei Luo,Xiang Guo,Dawen Zeng
Detecting nitrogen dioxide (NO2) at room temperature (RT) is crucial for advancing environmental monitoring technologies, enabling efficient and practical air quality assessment. Two-dimensional (2D) MXene nanomaterials, recognized for their large specific surface area (SSA), abundant functional groups, and tunable electrical properties, have attracted considerable attention as promising candidates for room temperature gas-sensing applications. However, despite their potential, challenges, such as low gas adsorption efficiency, limited sensitivity, and poor selectivity, hinder their broader application and development, highlighting the need for further research. Here, we introduce a zero-dimensional (0D)/2D heterojunction gas-sensitive structure by synthesizing SnS2 quantum dot (QD)-sensitized Ti3C2Tx MXene nanocomposites via a hydrothermal method. The carefully designed gas sensor exhibits a significantly enhanced response value (RV) of 5.83% for 10 ppm of NO2 and a low detection limit of 500 ppb at RT, achieving an RV that is 5.8 times higher than that of pure Ti3C2Tx. Additionally, the sensor demonstrates high sensitivity (0.76 ppm–1 in the 0.5–5 ppm range), excellent selectivity, and outstanding stability, with a performance degradation of only 3.2% over 4 weeks. The exceptional performance arises from the synergistic effects of the quantum confinement properties of SnS2 QDs and the superior conductivity of Ti3C2Tx, which together provide abundant active sites for gas adsorption and facilitate efficient charge transfer pathways. Furthermore, the formation of the heterojunction modulates the resistance, enhancing room temperature sensing capabilities. The synthesized nanomaterials offer significant potential for advancing the design of heterostructures that integrate 0D QDs with 2D nanomaterials, paving the way for highly efficient NO2 detection at RT. Moreover, maintaining an optimal operating temperature further enhances the accuracy and reliability of real-time NO2 monitoring systems.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2024
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IF 3.8
Chengzhi Liang,Zaiwei Fan,Yudan Zhu,Yuan Cao,Jiawei Kang,Jun Tao
Introduction: Two-dimensional (2D) MXene, recognized for its outstanding physical and chemical properties,has gained attention as a promising material in the biomedical field. However, its potential in tissue engineering applications remains underexplored. This study focuses on synthesizing SF-MXene composite electrospun fibers and evaluating their suitability for biomedical applications.Methods: SF-MXene composite electrospun fibers were prepared through electrospinning. The fibers were characterized using field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), mechanical testing, thermogravimetric analysis (TGA), and contact angle measurements.Protein adsorption capacity and biomineralization potential were assessed. Biocompatibility was evaluated using fibroblasts (L929) and preosteoblasts (MC3T3-E1), with alkaline phosphatase (ALP) activity measured in MC3T3-E1 cells to determine osteogenic potential.Results: The SF-MXene composite fibers exhibited well-defined morphological and structural properties, as confirmed by FE-SEM, FTIR, XRD, and TGA analyses. Mechanical testing revealed enhanced mechanical stability. The fibers showed high protein adsorption and potential biomineralization activity. Both L929 and MC3T3-E1 cells displayed high viability on the composite fibers, with significantly increased ALP activity in MC3T3-E1 cells, indicating osteogenic potential.Discussion: The findings demonstrate that SF-MXene composite fibers possess excellent structural, mechanical, and biological properties suitable for tissue engineering. The fibers’ ability to support cell viability, protein adsorption, and osteogenic activity highlights their potential in biomedical applications, particularly in bone tissue regeneration. These results suggest that MXene-based composites could be developed further for broader biomedical uses.
研究领域:
生物材料学
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组织工程学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Yan Huang,Zhangpeng Li,Kaiming Hou,Shuwen Liu,Qiulong Gao,Xiaonan Miao,Jinqing Wang,Shengrong Yang
In this study, a polydopamine (PDA)-modified MXene-PNIPAM (pMP) hydrogel is prepared using a soap-free emulsion polymerization method, which shows enhanced anti-oxidative, photo-thermal, and tribological properties. The introduction of PDA not only inhibits the oxidation of MXene but also enhances the photo-thermal conversion efficiency of the hydrogel. Even after 50 days, it can still maintain good photo-thermal conversion performance. Moreover, compared with PNIPAM hydrogel, the friction coefficient (COF) and wear volume of pMP hydrogel as lubricant were reduced by 33% and 85%, respectively. Interestingly, the control of COF with excellent reversibility and durability is achieved using pMP hydrogel modulated by near-infrared light. The pMP composite hydrogel exhibits promising prospects in the fields of intelligent robots and biomedical devices.
研究领域:
材料科学
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智能材料
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生物医学工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Min Wang,Shu Zhang,Qi Li,Yuanpeng Li,Enzhe Duan,Caimei Wen,Shujun Yu,Xiangxue Wang
Extracting uranium from seawater not only reduces radioactive contamination in seawater but also provides a source of uranium energy. However, due to the low concentration of uranium in seawater and the high salinity of seawater, extraction of uranium from seawater is challenging. In this work, we demonstrated a simple strategy to synthesize Fe-doped MXene (Fe@Ti 3 C 2 T x ) via a hydrothermal method and applied for uranium enrichment in seawater. The Fe@Ti 3 C 2 T x exhibited excellent adsorption performance in high salinity environments. The removal capacity of Fe@Ti 3 C 2 T x was determined to be 526.6 mg/g for UO 2 (CO 3 ) 2 2− at 328 K with quick reaction equilibrium (∼ 30 min). Kinetic and thermodynamic analyses of UO 2 (CO 3 ) 2 2− elimination process on Fe@Ti 3 C 2 T x surface revealed it to be a spontaneous and endothermic single-phase elimination process. FT-IR and XPS analyses further indicated that the removal mechanism of UO 2 (CO 3 ) 2 2− by Fe@Ti 3 C 2 T x was surface complexation. Our study suggests that Fe@Ti 3 C 2 T x can provide a feasible solution for uranium enrichment in seawater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）