Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Qingquan Lin,Yongcong Liu,Guangyong Zeng,Xiaoke Li,Bin Wang,Xiaojie Cheng,Arijit Sengupta,Xiaojun Yang,Zhenhua Feng
Membrane separation technology has been widely used in the field of industrial dye wastewater treatment . In this work, a series of new composite membranes were fabricated by modifying MXene two-dimensional (2D) materials with polydopamine (PDA) from the mussel biological inspiration via vacuum filtration on cellulose acetate (CA) support. Scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), X-ray diffraction technique (XRD), energy spectrum analysis (EDS), have been utilized to evident the successful synthesis of MXene and the modification of MXene by PDA. The resultant PDA@MXene/CA membrane was found to have good hydrophilicity, and the pure water flux reached up to 271.2 L·m −2 ·h −1 , which was 277% more than the unmodified membrane. An improvement in dye separation capability has also been noticed using PDA@MXene/CA membranes. The rejection ratio of direct red 28 reached 88.9%, and that of direct black 38 reached 88.6%. Moreover, a strong anti-fouling characteristic with good antibacterial ability of resultant membrane was demonstrated. Therefore, the new modified membrane showed the potential for good application prospects in the field of small molecule separation.
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Advanced Materials Technologies
·
2021
·Vol. 6
·期 11
·2100394
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IF 7.848
Fengxiao Niu,Zhen Qin,Lizhen Min,Biao Zhao,Yuhuan Lv,Xiaohui Fang,Kai Pan
3D aerogel-based piezoresistive sensors have attracted tremendous attention due to their high sensitivity and excellent mechanical properties. Here, a novel piezoresistive sensor with ultrahigh linear sensitivity is tactfully designed and prepared based on nanofiber-reinforced MXene–reduced graphene oxide aerogel. The presence of MXene endows the piezoresistive sensor with high conductivity. Besides, the nanofibers can act as a scaffold to improve the compression resilience of the aerogel significantly by penetrating the entire aerogel network. Furthermore, due to the synergy effect among the multiple components, the prepared piezoresistive sensor exhibits outstanding performance, including high linear sensitivity (331 kPa −1 from 0 to 500 Pa, 126 kPa −1 from 500 Pa to 7.5 kPa), fast response time (load 71 ms, recovery 15 ms), and low detection limit (1.25 Pa). More importantly, it can maintain stable signal output even after 17 000 compression cycles. Furthermore, the prepared sensor can efficiently detect breathing, heartbeat, and vocalization of the human body in real time. Based on these advantages, the prepared sensor is expected to show significant potentials in future flexible wearable electronic devices.
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MATERIALS LETTERS
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2020
·
IF 3.204
Qiuguo Wang,Xiangyue Xiao,Xinwen Hu,Liangbin Huang,Ting Li,Minghui Yang
Molecularly imprinted electrochemical sensor for ascorbic acid (AA) detection was prepared based on MXene modified glassy carbon electrode (MIPs/MXene/GCE). MXene with layered structure was synthesized by chemical etching method and the o-phenylenediamine (o-PD) polymer was electrochemically polymerized onto MXene modified electrode surface. With the binding of AA molecules onto electrode, the current response of the sensor was decreased. Under the optimized experimental conditions, the current response change of the sensor was in linear with the concentration of AA in the range from 0.5 μM to 10 μM with detection limit of 0.27 μM. The sensor has good selectivity, which was applied to the determination of AA in vitamin C tablets.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chao Peng,Xi Xie,Wenkang Xu,Tao Zhou,Ping Wei,Jianbo Jia,Kun Zhang,Yonghai Cao,Hongjuan Wang,Feng Peng,Rui Yang,Xiqiang Yan,Hui Pan,Hao Yu
Steering charge kinetics is one of the most urgent unsolved issues in photocatalysis. The effective spatial separation of photogenerated electron-hole pairs is particularly important in the design and controllable preparation of nano-photocatalysts. Herein, one-dimensional Nb 2 O 5 nanorod arrays with [0 0 1] orientation were grown in-situ on two-dimensional Nb 2 CT x MXenes through a facile hydrothermal method for the first time. Ag nanoparticles were then photodeposited on the Nb 2 O 5 nanorods to form hierarchical 0D/1D/2D nanohybrids. It was experimentally demonstrated that OH is predominantly adsorbed on Nb 2 CT x as termination groups, which resulted in a low work function (2.7 eV). Thanks to the unique structure, the highly active [0 0 1] Nb 2 O 5 nanorods afford high-efficiency photogeneration of electron-hole pairs, while the low-work-function OH terminated Nb 2 CT x allows for trapping holes, and Ag nanoparticles act as electron reservoir and sites of hydrogen evolution reaction (HER). The ternary Ag/Nb 2 O 5 @Nb 2 CT x nanohybrids reached a record HER activity (682.2 and 824.2 μmol·g -1 h −1 use methanol and glycerol as sacrificial agents, respectively) among the niobium-based photocatalysts, demonstrating the potential of MXenes as a platform for the synthesis of high-performance heterojunction structures, where the tunable electronic property is a key factor.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Daozheng Yang,Bing Zhou,Gaojie Han,Yuezhan Feng,Jianmin Ma,Jian Han,Chuntai Liu,Changyu Shen
Flexible transparent heaters based on photothermal energy conversion are highly desired for next-generation electronic devices. However, how to balance the photothermal conversion efficiency and transparency is still a huge challenge. In this work, we demonstrate a flexible polycarbonate (PC) film with balanced photothermal energy conversion performance and transparency obtained from the spraying polypyrrole (PPy)-modified Ti3C2Tx MXene (MXene@PPy) layer. Due to the synergistic light-to-heat effects of MXene and the attached PPy nanoparticles, the resulted transparent film heater (MP-PC) can obtain a satisfying photothermal conversion performance (47.5 °C at 100 mW/cm2) at a low spraying density of MXene and thus show an effective transmittance of 51.61%, simultaneously. Moreover, the photothermal conversion performance reveals an outstanding stability without significant deterioration after exposing to an outdoor environment for seven months. Besides, arising from the excellent surface electrical resistance (413 Ω/sq), the MP-PC film also exhibits an effective Joule heating capacity with a high heating temperature of 108 °C at 24 V input voltage. As one of the promising applications, the MP-PC film exhibits the effectiveness and feasibility as a light-triggered thermal therapy film for human skin in cold environments.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Enxiang Jiao,Kun Wu,Yingchun Liu,Maoping Lu,Hangzhen Zhang,Haoting Zheng,Chang-an Xu,Jun Shi,Mangeng Lu
A flexible cellulose nanofibers/MXene@Ag film with nacre-like structure is constructed by a facile vacuum-assisted filtration process. The composite film shows an outstanding thermal conductivity of 22.43 W m −1 K −1 at 30 wt% MXene@Ag loading, which enhances 769% relative to the pure CNFs film. This is mainly due to the bridging effect of silver nanoparticles can greatly reduce the interface thermal resistance between MXene nanosheets in the CNFs matrix. Particularly, the CNF/MXene film present a typical biomimetic nacre-like structure, which resulting in the satisfactory mechanical properties with a tensile strength of 71.4 ± 2.8 MPa and a toughness of 1.0 ± 0.06 MJ m −3 . Moreover, the composite film exhibits excellent photothermal properties that the surface temperature of the CNF/MXene@Ag film can rose to ~48 °C after 210 s of 55 W light irradiation. Hence, our work provides a facial method for preparation of multifunctional thermal management film.
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COMPOSITES PART B-ENGINEERING
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2020
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IF 7.635
Chuan Liu,Wei Wu,Yongqian Shi,Fuqiang Yang,Minghua Liu,Zhixin Chen,Bin Yu,Yuezhan Feng
Developing highly effective flame retardant polymeric materials with the release of low toxic fumes during burning still keep a huge challenge. In this work, we demonstrated successful synthesis of titanium carbide-reduced graphene oxide (Ti 3 C 2 T x -rGO) hybrid via hydrogen bonding induced assembly of Ti 3 C 2 T x and rGO, which was utilized to improve the thermal and fire safe performances of thermoplastic polyurethane elastomer (TPU). The results indicated that the Ti 3 C 2 T x -rGO hybrid showed a strong adhesion and good compatibility with TPU host. Furthermore, as-prepared Ti 3 C 2 T x -rGO hybrid was homogeneously dispersed in the TPU matrix due to the mutual intercalation of rGO and Ti 3 C 2 T x preventing the re-aggregation. The thermal stability of TPU was dramatically improved after the introduction of Ti 3 C 2 T x -rGO. With addition of 2.0 wt% Ti 3 C 2 T x -rGO, the peak of smoke production rate and total smoke release of TPU nanocomposite were remarkably decreased by 81.2% and 54.0%, respectively. In addition, the TPU/Ti 3 C 2 T x -rGO-2.0 showed distinct reductions in the peak of carbon monoxide production rate (54.1%) and total carbon monoxide yield (46.2%). The physical barrier effect, the catalytic charring of Ti 3 C 2 T x -rGO hybrid and the chemical transformation of Ti 3 C 2 T x were responsible for the excellent fire resistance of TPU/Ti 3 C 2 T x -rGO systems. This work provides a novel strategy to significantly reduce the fire hazards of TPU, thus broadening its industrial applications.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Sainan Zhang,Ying Liu,Min Feng,Bowen Zhang,Tongtong Yu,Shiwei Xu,Guoyun Sun,Daoai Wang
In this study, a new photoelectrochemical material is fabricated by loading two-dimensional leaf-like Ti 3 C 2 MXene nanosheets into the TiO 2 nanorod array to form Ti 3 C 2 nanosheets/TiO 2 nanorod (Ti 3 C 2 /TiO 2 NR) composite photoanode materials. The unique two-dimensional/one-dimensional (2D/1D) composite photocatalytic materials enhance the photoelectrochemical water splitting performance under simulated solar light (100 mW cm −2 ) and yield a high photocurrent density of 1.41 mA cm −2 at 1.23 V vs . reversible hydrogen electrode (V vs. RHE ) and photoconversion efficiency of 0.46% at 0.78 V vs. RHE , which are almost 3.13 and 5.82 times higher, respectively, than those of the pure rutile TiO 2 NRs. The enhanced photoelectrochemical performances are attributed to the photogenerated electrons produced by TiO 2 NR which could be quickly transported by Ti 3 C 2 nanosheets due to their good electrical conductivity and increased specific surface area, which improve the separation efficiency of electrons and holes. These Ti 3 C 2 /TiO 2 NR, as new photocatalytic materials, have promising potential applications in the fields of photoelectrochemical water splitting, solar cells, and other photocatalytic devices.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 4
·1772-1784
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IF 3.502
Jinxue Ding,Fengbo Chen,Jianxin Chen,Jin Liang,Jie Kong
Demand for high-performance electromagnetic (EM) wave absorbing materials with high-temperature resistance is always urgent for application in a harsh environment. In this contribution, two-dimensional material, Ti 3 C 2 T x MXene, was introduced into a hyperbranched polyborosilazane. After pyrolyzation, the as-prepared TiC/SiBCN ceramics present excellent EM wave absorption in X-band. The TiC nanograins appearing after annealing provide multilevel reflection and interface polarization. Dipole polarization formed at interface defects, in company with interfacial polarization, also makes a great contribution to enhanced EM wave absorption. The TiC/SiBCN nanocomplex prepared with 5 wt% Ti 3 C 2 T x MXene possesses a minimum reflection coefficient of −45.44 dB at 10.93 GHz and abroad bandwidth 8.4 and 12.4 GHz, almost covering the entire X-band. Tuning the thickness in the range of 2.35-2.54 mm, the effective absorption band can achieve the entire X-band. And the EM wave absorbing performance has been maintained to a large extent at 600°C with the minimum reflection coefficient of −26.12 dB at 12.13 GHz and the effective absorption bandwidth of 2 GHz. Last but not the least, TiC/SiBCN ceramics offer a good thermal stability in argon as well as in air atmosphere, making it possible to serve in high-temperature detrimental environments. This study is expected to provide a new perspective for the design of high-performance absorbing materials that are able to be used in harsh environments, especially in high temperatures.
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APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Feitian Ran,Tianlin Wang,Siyu Chen,Yuyan Liu,Lu Shao
2D transition metal carbide (MXene) based flexible films have received increasing attention in the application of energy storage for portable and wearable electronic devices. However, the self-restacking caused by Van der Waals interactions between the layers lead to insufficient access to allow the electrolyte ions to contact the active material. Herein, we rationally utilized the freeze-drying technique to prepare MXene film electrode for alleviating its self-restacking and improving the electrochemical performances. Through freeze-drying treatment, the frozen solvent molecules were removed by sublimation, and alleviating the adverse effect of van der Waals forces and contributing to the enlarged layer space. The constructed freeze-dried MXene (f-MXene) films generate unique porous architecture, which can provide highly efficient ion diffusion and transport channels. Consequently, the typical f-MXene-10 film exhibit good specific capacitance (341.5 F g −1 /922.1 F cm −3 at 1 A g −1 ) and desired capacitance retention of 60.4% from 1 to 10 A g −1 . Moreover, the assembled asymmetric device delivered a maximal gravimetric energy density of 6.1 Wh Kg −1 , volumetric energy density of 16.4 Wh L −1 and a good capacitance retention of 89.3% after 10,000 cycles. The rationally designed synthesizing route has attractive promise to promote MXene materials for diverse energy and environmental applications.
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ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Chang Ma,Qi Yuan,Haishun Du,Ming-Guo Ma,Chuanling Si,Pengbo Wan
Over the past few years, wearable electronics and smart textiles have seen tremendous growth in both academia and industries. However, it is still a challenge to prepare robust, flexible, wearable, and multiresponsive textile electronics. A newly blooming two-dimensional (2D) transition-metal carbide/nitride (MXene) is regarded as an ideal active material to build multifunctional electronics due to its intriguing properties. Herein, a hydrophobic and multifunctional textile composite (Si-MAP) was prepared by decoration of conductive MXene nanosheets onto air-laid paper, followed by wrapping with poly(dimethylsiloxane) (PDMS). These obtained smart textiles exhibited excellent electronic/photonic/mechanical triresponsive properties: Si-MAPs could reach high equilibrium temperatures (104.9 and 118.7 °C) under quite low power illumination (1.25 W cm–2) and working voltage (4 V). The Si-MAP pressure sensor exhibited high sensitivity and rapid response time (30–40 ms), which can capture a wide range of human movements. Moreover, the thin PDMS layer not only rendered the textile composites hydrophobic but also improved the stability and adaptation for daily use. Remarkably, the hydrophobic Si-MAPs have maintained the advantages of breathability and washability, which make them suitable for wearing. Thus, this smart Si-MAP textile provides a reference for the study of the next generation of light, portable, and wearable textile-based electronic devices.
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