Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Xian Zeng,Yuchen Wang,Xinyi He,Caocong Liu,Xi Wang,Xinpeng Wang
Being one of the most toxic pollutants commonly present in wastewater as soluble hexavalent chromium (Cr(VI)) specie, its concomitant adsorption and chemical reduction to relatively insoluble and less poisonous Cr(III) would be an effective strategy for remediation of Cr-polluted water. As such, a novel MXene-polyelectrolyte nanocomposite was typically synthesized for enhanced Cr(VI) removal. In detail, we applied polyethylenimine (PEI) to modify the Ti 3 C 2 T x surfaces and synthesized Ti 3 C 2 T x /PEI nanocomposites. The as-prepared composites were characterized by various methods such as SEM-EDX, N 2 sorption-desorption isotherm, XRD, FTIR, and XPS. Further, the Ti 3 C 2 T x /PEI was used to adsorb Cr(VI) for clarifying the kinetics, isotherms, and the effects of solution pH and coexisting ions on Cr(VI) removal by batch experiments. Our results show that coating of Ti 3 C 2 T x nanosheets with PEI regulates surface charge of the as-synthesized adsorbent and creates it with a three-dimensional network, allowing the fast electrostatic adsorption of Cr(VI) anions to positively charged surface over wide pH range of 1–10 and promoting to achieve improved removal capacity maximum up to 186.5 mg/g. The Cr(VI) adsorption data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm models. In addition, Ti 3 C 2 T x /PEI also exhibits excellent selectivity for Cr(VI) anions over competing ones such as NO 3 − , Cl − , ClO 4 − , and SO 4 2− . Time-dependent reaction routes of Ti 3 C 2 T x /PEI nanocomposite toward Cr(VI) was studied by XPS, which confirmed the slow reduction of all sorbed Cr(VI) to Cr(III) in the dozens of hours and final in-situ Cr(III) immobilization, clarifying the sorption-reduction mechanism for Cr(VI) elimination. All these results suggest that Ti 3 C 2 T x /PEI nanocomposite prepared by reported surface-modification approach available for developing other functionalized adsorbents, may be a potential candidate for decontamination of Cr(VI)-polluted wastewater.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xin-Jie Luo,Lulu Li,Hao-Bin Zhang,Sai Zhao,Yu Zhang,Wei Chen,Zhong-Zhen Yu
To diversify the motion modes of multifunctional soft robots capable of shape programming, we fabricate a biomimetic and programmable Ti3C2Tx MXene/low-density polyethylene (LDPE) bilayer actuator by spraying an aqueous dispersion of MXenes onto a plasma-activated LDPE film, followed by optimal thermal regulations. Because of the eminent light absorption and photothermal/electrothermal features of MXenes and the extremely mismatched thermal expansion coefficients between the two layers, the MXene/LDPE actuator can be sensitively driven by many stimuli of near-infrared light, electricity, and heat. The initial configuration of the bilayer actuator can be programmed by tuning the thermal regulation temperature, thereby assembling multiple actuation units to achieve biomimetic functions, such as artificial iris, mechanical arms, and flying birds. More importantly, in virtue of free shape cutting and programmable configuration, the MXene/LDPE bilayer actuator can perform untethered locomotion including crawling, rolling, and sailing. The soft robots can not only move on the ground in different forms but also sail on water along any designated routes and complete the surface cargo transportation driven by a near-infrared laser via the photothermal Marangoni effect. The shape-programmable methodology for the three amphibious motion modes lays foundations for wide applications of the MXene-based soft robots.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Luyang Liang,Gaojie Han,Yang Li,Biao Zhao,Bing Zhou,Yuezhan Feng,Jianmin Ma,Yaming Wang,Rui Zhang,Chuntai Liu
Electromagnetic (EM) pollution affecting people’s normal lives and health has attracted considerable attention in the current society. In this work, a promising EM wave absorption and shielding material, MXene/Ni hybrid, composed of one-dimensional Ni nanochains and two-dimensional Ti3C2Tx nanosheets (MXene), is successfully designed and developed. As expected, excellent EM wave absorption and shielding properties are obtained and controlled by only adjusting the MXene content in the hybrid. A minimum reflection loss of −49.9 dB is obtained only with a thickness of 1.75 mm at 11.9 GHz when the MXene content is 10 wt %. Upon further increasing the MXene content to 50 wt %, the optimal EM shielding effectiveness (SE) reaches 66.4 dB with an absorption effectiveness (SEA) of 59.9 dB. Mechanism analysis reveals that the excellent EM wave absorption and shielding performances of the hybrid are contributed to the synergistic effect of conductive MXene and magnetic Ni chains, by which, the dielectric properties and electromagnetic loss can be easily controlled to obtain appropriate impedance matching conditions and good EM wave dissipation ability. This work provides a simple but effective route to develop MXene-based EM wave absorption and shielding materials. A universal guideline for designing the absorbing and shielding materials for the future is also proposed.
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Results in Physics
·
2019
·
IF 3.042
Dongyong Shan,Jun He,Lianwen Deng,Shuoqing Yan,Heng Luo,Shengxiang Huang,Yunchao Xu
Incorporation of magnetic loss component is more favorable to high-performance microwave absorbing materials. In this paper, the NiFe 2 O 4 -decorated Ti 3 C 2 T x MXene composites were synthesized by the in-situ chemical co-precipitation method. The magnetic NiFe 2 O 4 nanoparticles were attached on the surfaces or inserted into the interlayers of Ti 3 C 2 T x MXene. Interestingly, we reduced effectively complex permittivity and enhanced magnetic loss by increasing the NiFe 2 O 4 content on Ti 3 C 2 T x MXene. Stronger electromagnetic attenuation ability and preferable impedance matching property were achieved and considered to be responsible mainly for improving absorbing peaks as well as bandwidth of the NiFe 2 O 4 -Ti 3 C 2 T x MXene composite. In particular, the NiFe 2 O 4 -Ti 3 C 2 T x -20 sample exhibited an optimal effective absorption bandwidth ( RL < −10 dB) of 7.68 GHz with the material thickness of only 1.5 mm. These findings are believed to pave the way of further promoting microwave absorption performance of Ti 3 C 2 T x MXene from magnetic functionalized decoration of view.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Tian Zhang,Limei Pan,Huan Tang,Fei Du,Yanhua Guo,Tai Qiu,Jian Yang
Herein, enhanced exfoliation and large-scale delamination of two-dimensional (2D) Ti 3 C 2 T x MXene using etchant of HCl + LiF, instead of HF, in which both etching and intercalation were achieved in exfoliation process, were thoroughly investigated with the focus on the effects of two critical factors, reaction temperature and washing solution. Increasing etching temperature promotes the exfoliation process, i.e., the transformation from Ti 3 AlC 2 to multilayer Ti 3 C 2 T x MXene, whereas simultaneously results in an aggravated surface oxidation of MXene layers formed after the extraction of Al. As a result, delamination ratio increases firstly and then decreases, and the samples etched at 35 °C show the highest delamination ratio. Compared with the distilled water, washing the exfoliation products using ethanol significantly improves the delamination ratio of Ti 3 C 2 T x MXene by co-intercalation of larger alcohol molecule and more impurity ions and a large scale delamination of Ti 3 C 2 T x MXene with a delamination ratio as high as 29.2% was obtained by simple sonication for 1 h, without additional intercalation step required, after washing using ethanol. The possible exfoliation reactions by HCl + LiF solution were proposed. Using the as-fabricated stable suspensions of delaminated Ti 3 C 2 T x flakes, flexible, free-standing Ti 3 C 2 T x papers with tailored thickness, hydrophilic surface and excellent conductivity, typically 2 × 10 5 S/m at 5 μm in thickness, were prepared. As anode for lithium ion batteries , the delaminated Ti 3 C 2 T x MXene obtained reversible capacities of 226.3 mAh g −1 , 137.9 mAh g −1 ,102.0 mAh g −1 and 47.9 mAh g −1 respectively at the current density of 100, 300, 1000 and 3000 mA g −1 , which are superior to those of the Ti 3 C 2 MXene prepared by conventional HF process.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 17
·6086-6097
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IF 5.7
Yuanhao Ning,Shuang Yang,Xianxian Sun,Shasha Wang,Lei Liang,Yuanjing Cheng,Ye Yuan,Yibin Li
Transition metal carbides and nitrides (MXenes) with excellent properties have broad prospects in electromagnetic wave absorption (EMA). In this paper, a unidirectional freeze-casting method was utilized to design a double-layer MXene absorber with orthogonal microstructures. The perpendicular and parallel samples (associated with the unidirectional freeze-casting direction), perform their respective roles in the designed double-layer absorber. The perpendicular sample with various attenuation techniques is employed as an electromagnetic wave attenuation layer, while the parallel sample with good impedance matching conditions is utilized as an impedance matching layer. Consequently, the entire absorber exhibits favorable EMA characteristics. Upon incidence of electromagnetic waves onto the parallel terminus, it is observed that the sample measuring 4.6 mm in thickness exhibits a minimal reflection loss (RLmin) of −60.8 dB at a frequency of 6.63 GHz, with a parallel end thickness accounting for 25%. In addition, the sample with a thickness of 2.6 mm displays a noteworthy maximal effective absorption bandwidth (EAB) amounting to 9.4 GHz, given a parallel end thickness of 20%. A thorough analysis of the impedance matching conditions and electromagnetic wave attenuation mechanisms of each sample reveals that the double-layer MXene absorbers with orthogonal microstructures can significantly increase the viability of MXenes in EMA.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jingxuan Cui,Jiao Wu,Aihu Feng,Yang Yu,Le Mi,Yun Yu
As a novel material with low infrared emissivity, Ti 3 C 2 T x MXene is promising in infrared stealth. However, the problem that MXene is easily oxidized poses a great challenge to its practical applications. In this paper, a tannic acid (TA) enhanced MXene oxidation stability composite film with low infrared emissivity is reported. TA effectively diminishes the pore size within the MXene film and leads to a tight and orderly arrangement of nanosheets, maintaining the low emissivity properties of Ti 3 C 2 T x MXene itself. In addition, TA reacts preferentially with H 2 O/O 2 entering the film to consume the oxidizing source, while also being able to form coordination with Ti atoms for protection against oxidation, resulting in the composite film exhibiting excellent oxidation resistance. Remarkably, there is no formation of TiO 2 and the emissivity only rises from 0.16 to 0.18 after 72 h in the humid heat environment. Even after prolonged exposure to 20-day humid heat, it still maintains exceptional infrared emissivity (0.24) and stealth performance (reducing the radiant temperature of the object from 94 °C to 47.4 °C, △T = 46.6 °C). In contrast, the original Ti 3 C 2 T x MXene film has lost its infrared stealth performance after 10-day humid heat (△T = 5.3 °C) with an infrared emissivity of 0.76. This paper provides a new strategy to solve the problem of MXene performance stability in humid and oxidizing environments.
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MICROCHIMICA ACTA
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2024
·Vol. 191
·期 8
·1-10
·
IF 5.3
Feng Lei,Chen Junji,Yang Min,Wang Juan,Yin Shougen,Zhang Deliang,Qin Wenjing,Song Jibin
Ti 3 C 2 T x MXene/Cu x O composites were prepared by acid etching combined with electrochemical technique. The abundant active sites on the surface of MXene greatly increase the loading of Cu x O nanoparticles, and the synergistic effect between the different components of the composite can accelerate the oxidation reaction of glucose. The results indicate that at the working potential of 0.55 V (vs. Ag/AgCl), the glucose sensor based on Ti 3 C 2 T x MXene/Cu x O composite presents large linear concentration ranges from 1 µM to 4.655 mM (sensitivity of 361 µA mM −1 cm −2 ) and from 5.155 mM to 16.155 mM (sensitivity of 133 µA mM −1 cm −2 ). The limit of detection is 0.065 µM. In addition, the sensor effectively avoids the oxidative interference of common interfering species such as ascorbic acid, dopamine and uric acid. The sensor has good reproducibility, stability and acceptable recoveries for the detection of glucose in human sweat sample (97.5-103.3%) with RSD values less than 4%. Based on these excellent properties it has great potential for the detection of glucose in real samples. Graphical abstract
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ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Leikai Zhao,Rui Zhang,Guixin Yang,Yuhang Wang,Shili Gai,Xin Zhao,Mengmeng Huang,Piaoping Yang
Foreseen as foundational in forthcoming oncology interventions are multimodal therapeutic systems. Nevertheless, the tumor microenvironment (TME), marked by heightened glucose levels, hypoxia, and scant concentrations of endogenous hydrogen peroxide could potentially impair their effectiveness. In this research, two-dimensional (2D) Ti3C2 MXene nanosheets are engineered with CeO2 nanozymes and glucose oxidase (GOD), optimizing them for TME, specifically targeting cancer therapy. Following our therapeutic design, CeO2 nanozymes, embodying both peroxidase-like and catalase-like characteristics, enable transformation of H2O2 into hydroxyl radicals for catalytic therapy while also producing oxygen to mitigate hypoxia. Concurrently, GOD metabolizes glucose, thereby augmenting H2O2 levels and disrupting the intracellular energy supply. When subjected to a near-infrared laser, 2D Ti3C2 MXene accomplishes photothermal therapy (PTT) and photodynamic therapy (PDT), additionally amplifying cascade catalytic treatment via thermal enhancement. Empirical evidence demonstrates robust tumor suppression both in vitro and in vivo by the CeO2/Ti3C2-PEG-GOD nanocomposite. Consequently, this integrated approach, which combines PTT/PDT and enzymatic catalysis, could offer a valuable blueprint for the development of advanced oncology therapies.
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JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Hua Tian,Zhiwei Guo,Wenjun Zhao,Lin Wang,Deqi Kong,Yanyan Wang,Lixin Zhang,Lingyu Li,Ran Sun,Ruohan Li,Jian Song
Hybrid layers composed of polyacrylic acid and Ti 3 C 2 T x MXene are coated on the surface of Zn foils via electrophoresis deposition processes , realizing the construction of an artificial protective coating with the pre-introduction of excess Zn 2+ towards suppressing Zn 2+ 2D diffusion of Zn deposition behavior . In this case, the abundant carboxyl groups of polyacrylic acid benefit to the fast transport of Zn 2+ in addition to the shield of anions and oxidants, restraining the corrosion and passivation of Zn metal anodes. Moreover, the appearance of Ti 3 C 2 T x MXene with two-dimensional arrangements strengthens the structure stability and improves the hydrophilicity of hybrid layers so as to restrict the dendrite growth of Zn metal anodes. Accordingly, polyacrylic acid/Ti 3 C 2 T x MXene hybrid layer coated Zn electrodes in symmetric cells achieve a lifespan of over 1000 h at a current density of 3 mA cm −2 and an areal capacity of 3 mAh cm −2 , superior to pristine Zn electrodes (107 h) and polyacrylic acid layer coated Zn electrodes (401 h). The full cell based on polyacrylic acid/Ti 3 C 2 T x MXene hybrid layer coated Zn anodes and Na 0.33 V 2 O 5 cathodes also exhibits a high capacity retention of 98.6 % after 1000 cycles at a current density of 5 A g −1 .
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2024
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IF 8.1
Hang Jia,Cheng Liu,Yu Zhang,Yue Qiao,Wenqi Zhao,Xi Chen,Xigao Jian
Electrophoretic deposition (EDP) is a novel and promising technique for surface modification, however, the adsorption of Ti 3 C 2 T x MXene or graphene oxide (GO) onto the basalt fiber (BF) surface by EPD and its effects on the mechanical performance of basalt fiber reinforced high-performance thermoplastic (BFRHPTP) composite have yet to be investigated. Here, the mechanical and interfacial properties of the modified BF/PPENK were explored. The influence of the brittle/tough nanostructures in interphase on the mechanical performance of BF reinforced poly(phthalazinone ether nitrile ketone) (BF/PPENK) was elucidated. The results indicated that the thermal reduction of GO contributed even more to enhancing the tensile, flexural, interlaminar shear, and interfacial shear strength of BF/PPENK compared to the heat oxidation of MXene. Particularly, these properties of BF-NH 2 @GO3/PPENK were improved by approximately 84%, 43%, 60%, and 118% in comparison to BF-Desized/PPENK. This work may provide some guidance on the interfacial modification of the BFRHPTP composites.
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Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-15
·
IF 23.2
Bi Xiaoyu,Shi Yang,Ge Shengbo,Xu Ben Bin,Li Xia,He Ximin,Huang Runzhou
Reduced graphene oxide (rGO) and MXene have garnered significant attention due to their exceptional pseudocapacitance and electrical conductivity that are viable in energy storage applications. Nevertheless, the challenge of self-restacking between the 2D material surfaces and the tendency of MXene to oxidise has posed obstacles to their further utilisation. This prompted researchers to use cellulose nanofibre (CNF) as a prospective “bridge” to connect the two materials. This approach has been shown to prevent MXene from oxidising while facilitating GO conversion into rGO via reduction. Consequently, 3D macroporous Ti 3 C 2 T x MXene/cellulose nanofibres/reduced graphene oxide (MCG) aerogels have been successfully prepared. A breakthrough in solving the self-stacking problem and creating a sensibly designed 3D macroporous electrode structure has yielded excellent electrochemical capabilities for MCG aerogel electrodes. Specifically at 1.0 mW cm −2 power density, these electrodes have demonstrated an outstanding performance in 5000 cycles with 79.4% retention rate, favourable areal specific capacitance of 671 mF cm −2 and unparalleled energy density of 60.9 mWh cm −2 . Overall, this study offers significant perspectives on the possible uses of 2D materials, especially in terms of adjusting their structure and functionality.
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