Journal of Environmental Chemical Engineering
·
2021
·
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.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Xin-Hua Gao,Jing-Wen Wang,Da-Nian Liu,Xin-Zhu Wang,Hou-Qing Wang,Lei Wei,Hua Ren
Excellent dielectric properties are essential for electromechanical applications of dielectric elastomer. This work confirms that acrylic resin elastomer (AE)-based percolative composites using MXene (Ti 3 C 2 T x ) nanosheets modified with PANI (referred to as PANI-Ti 3 C 2 T x ) as conductive fillers exhibit improved dielectric performances. Ti 3 C 2 T x /AE and PANI-Ti 3 C 2 T x /AE composites with different filler contents were prepared, and their percolation threshold are 6.01 vol% and 6.43 vol%, respectively. The dielectric constant of 6.39 vol% PANI-Ti 3 C 2 T x /AE is 298 at 100 Hz, which 1.67 times that of 5.98 vol% Ti 3 C 2 T x /AE composites (178), and is 85 times that of the pure AE matrix (3.5). Moreover, the dielectric loss of 6.39 vol% PANI-Ti 3 C 2 T x /AE composite still maintains at a low level (0.29 at 100 Hz), which is lower than that of 5.98 vol% Ti 3 C 2 T x /AE composite (0.55 at 100 Hz). We suppose that the improved dielectric constant of PANI-Ti 3 C 2 T x /AE composites is attributed to the enhanced micro capacitors effect and Maxwell-Wagner-Sillars effect.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 7
·51627
·
IF 3.125
Tingting Wang,Jinqing Wang,Zhangpeng Li,Mingqiang Yue,Xiaoli Qing,Pengxia Zhang,Xiaozhu Liao,Zengjie Fan,Shengrong Yang
Conductive hydrogels with high flexibility, superior formability, good mechanical elasticity, and excellent biocompatibility have emerged as promising materials for broad applications in flexible/wearable electronic devices. In this work, a conductive dual-network PVA/SA/MXene hydrogel (PSM-h) composed of polyvinyl alcohol, sodium alginate, and MXene (Ti 3 C 2 T x ) is constructed by a green method without using chemical crosslinking agents. The resultant hydrogel with dual-network feature shows excellent cytocompatibility (no toxicity for human umbilical cord mesenchymal stem cells), high stretchability (up to 263%), and superior anti-fatigue ability (stretched up to 1000 cycles). More importantly, PSM-h based strain sensor presents good sensing sensitivity with a fast response time (62.5 ms) and a low detection limit even under a very slight strain of 0.2%. In terms of the practical application, the PSM-h based strain sensor can be applied to detect and distinguish various human motions.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Song Yang,Ding-Xiang Yan,Yue Li,Jun Lei,Zhong-Ming Li
Polymeric films with high electromagnetic interference (EMI) shielding effectiveness (SE) and polyfunctionality are highly desirable for wearable electronic devices. Herein, a sandwich-structured EMI shielding film with Joule heating performance composed of a poly(vinylidene fluoride) (PVDF) layer and a conductive filler layer (silver nanowire (AgNW) and MXene) was constructed by electrostatic spinning, vacuum-assisted filtration (VAF), and hot compression. An independent AgNW layer endowed the film with predominant EMI shielding performance at a low conductive filler content. A high EMI SE of 45.4 dB was obtained in the X band at a AgNW fraction of 1.28 wt %. The introduction of MXene improved the connection of the AgNW networks, thereby further enhancing the electrical conductivity and imparting the film with long-term stability. The as-obtained PVDF-AgNW/MXene film exhibited an outstanding EMI SE of 47.8 dB and only a slight decrease in EMI SE was detected after 2000 bending cycles. Besides, the PVDF-AgNW/MXene film exhibits excellent Joule heating performance. The surface temperature of the film could exceed 77 °C under an applied voltage of 2.5 V. Therefore, our sandwich-structured film with enhanced EMI shielding and Joule heating performance can be used for flexible electronic device applications in extreme conditions.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Yongqian Shi,Chuan Liu,Libi Fu,Yuezhan Feng,Yuancai Lv,Zixiao Wang,Minghua Liu,Zhixin Chen
A large number of toxic fumes evolved from polymeric materials are a great threat to human evacuation. The aim of this work is to dramatically reduce the generation of smoke and toxic gaseous products upon polymers burning. A highly efficient titanium carbide/nano-copper (Ti 3 C 2 T x /Nano-Cu) hybrid smoke suppressant was synthesized by interficial adhesion and then incorporated into thermoplastic polyurethane (TPU) to fabricate TPU nanocomposites. The Ti 3 C 2 T x /Nano-Cu hybrid was homogeneously dispersed in the TPU matrix and showed a strong interfacial interaction with the TPU host. Introducing the Ti 3 C 2 T x /Nano-Cu hybrid into TPU led to enhanced high-temperature stability. Furthermore, the smoke production rate, CO production rate and total CO yield of the TPU nanocomposite containing 2 wt% Ti 3 C 2 T x /Nano-Cu hybrid decreased by 66.7%, 51.8% and 52.9%, respectively, compared with those of pure TPU. The reduced fire hazards of the TPU were due to the physical barrier, the catalytic charring and the chemical conversion of Ti 3 C 2 T x /Nano-Cu hybrid.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xilu Hong,Zong Lu,Yali Zhao,Luxi Lyu,Li Ding,Yanying Wei,Haihui Wang
As one of the green, renewable, and clean energy resources, hydrogen is widely developed and utilized throughout the world. Highly efficient membrane separation for hydrogen production is required to give promising gas permeance with enough H 2 selectivity. The membranes are desired to be produced in large-scale, fast and facile methods. Here we report for the first time a kind of freestanding MXene-ZIF-8 dual-layered membrane for hydrogen separation. Fast synthesis of such membranes is realized by combining electrophoretic deposition (EPD) and fast current-driven synthesis (FCDS), achieving the assemble of MXene layer and growth of ZIF-8 layer, respectively, overcoming the traditional time-consuming vacuum filtration methods and solvothermal synthesis . The MXene-ZIF-8 dual-layered membrane prepared within 20 min exhibits significantly improved gas separation performance, whose H 2 /CO 2 selectivity increases from 44 for the pristine MXene membrane to 77 with H 2 permeance of 5.97 × 10 −8 mol m −2 s −1 Pa −1 . This concept of structure design of membrane can also be extended to other dual-layered membranes, including various 2D nanosheet layers combined with different MOF layers.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2019
·
IF 13.903
Zong Lu,Yanying Wei,Junjie Deng,Li Ding,Zhong-Kun Li,Haihui Wang
A 2D membrane-based separation technique has been increasingly applied to solve the problem of fresh water shortage via ion rejection. However, these 2D membranes often suffer from a notorious swelling problem when immersed in solution, resulting in poor rejection for the monovalent metal ion. The design of the antiswelling 2D lamellar membranes has been proved to be a big challenge for highly efficient desalination. Here a kind of self-crosslinked MXene membrane is proposed for ion rejection with an obviously suppressed swelling property, which takes advantage of the hydroxyl terminal groups on the MXene nanosheets by forming Ti–O–Ti bonds between the neighboring nanosheets via the self-crosslinking reaction (−OH + −OH = −O– + H2O) through a facile thermal treatment. The permeation rates of the monovalent metal ions through the self-crosslinked MXene membrane are about two orders of magnitude lower than those through the pristine MXene membrane, which indicates the obviously improved performance of the ion exclusion by self-crosslinking between the MXene lamellae. Moreover, the excellent stability of the self-crosslinked MXene membrane during the 70 h long-term ion separation also demonstrates its promising antiswelling property. Such a facile and efficient self-crosslinking strategy gives the MXene membrane a good antiswelling property for metal ion rejection, which is also suitable for many other 2D materials with tunable surface functional groups during membrane assembly.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ning-Ning Wang,Hao Wang,Yu-Ying Wang,You-Hao Wei,Jing-Yu Si,Anthony Chun Yin Yuen,Jin-Song Xie,Bin Yu,San-E Zhu,Hong-Dian Lu,Wei Yang,Qing Nian Chan,Guan-Heng Yeoh
Polyimide (PI) aerogels have attracted great attention owing to their low density and excellent thermal stability. However, hydrophobic surface modification is required for PI aerogels to improve their ability in oil/water separation due to their amphiphilic characteristic. Two-dimensional MXenes (transition metal carbides/nitrides) can be utilized as nanofillers to enhance the properties of polymers because of their unique layered structure and versatile interface chemistry. Herein, the robust, lightweight, and hydrophobic PI/MXene three-dimensional architectures were fabricated via freeze-drying of polyamide acid/MXene suspensions and thermal imidization. Polyamide acid was synthesized using N-N-dimethylacetamide and 4,4′-oxydianiline. MXene (Ti3C2Tx) dispersion was obtained via the etching of Ti3AlC2 and ultrasonic exfoliation. Taking advantage of the strong interaction between PI chains and MXene nanosheets, the interconnected, highly porous, and hydrophobic PI/MXene aerogels with low density were fabricated, resulting in the improved compressive performance, remarkable oil absorption capacity, and efficient separation of oil and water. For the PI/MXene-3 aerogel (weight ratio, 5.2:1) without any surface modification, the water contact angle was 119° with a density of 23 mg/cm3. This aerogel can completely recover to its original height after 50 compression–release cycles, exhibiting superelasticity and exceptional fatigue-resistant ability. It also showed high absorption capacities to various organic liquids ranging from approximately 18 to 58 times of their own weight. This hybrid aerogel can rapidly separate the chloroform, soybean oil, and liquid paraffin from the water–oil system. The thermally stable hybrid aerogel also exhibited excellent fire safety properties and outstanding reusability under an extreme environment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 19
·12095-12104
·
IF 10.733
Guozhen Liu,Jie Shen,Yufan Ji,Quan Liu,Gongping Liu,Jian Yang,Wanqin Jin
Two-dimensional (2D) material membranes have shown great potential for molecular separation. However, it remains challenging to controllably tune 2D material membrane structures with ordered nanochannels without non-selective defects. Herein, for the first time, 2D Ti2CTx MXene membranes were designed and fabricated for efficient solvent dehydration via a new strategy. Specifically, positively charged hyperbranched polyethylenimine was intercalated between negatively charged MXene nanosheets to assemble regular stacking structures via electrostatic interactions, followed by interfacial polymerization with trimesoyl chloride to seal possible non-selective defects. This strategy realized integrated Ti2CTx membranes as thin as ∼100 nm with highly ordered 2D nanochannels, thereby exhibiting outstanding separation performance: the water content was enriched to >99 wt% in permeate from 10 wt% water/isopropanol mixtures. Compared with commonly studied Ti3C2Tx MXene membranes prepared by the same approach, the Ti2CTx membranes showed higher selectivity with similarly high flux. The membrane fabrication approach developed herein offers a powerful platform for the rational design of 2D material thin films for precise molecular separation and other applications.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Menghui Li,Liang Fang,Hua Zhou,Fang Wu,Yi Lu,Haijun Luo,Yuxin Zhang,Baoshan Hu
In this paper, Nickel–Cobalt layered double hydroxide (NiCo-LDH) nanosheets were first in situ synthesized on MXene (Ti 3 C 2 ) via a simple hydrothermal method , then glucose sensing performance based on three-dimensional porous MXene/NiCo-LDH nanocomposite was explored. At a working potential of 0.45 V (vs. SCE), the glucose sensor exhibits a wide linearity range (0.002 mM–4.096 mM), a low limit of detection (0.53 μM) and a rapid response (<3 s). Moreover, good selectivity , reproducibility and stability were also obtained. And the excellent performance can attribute to large area of contact of materials surface with glucose, fast electron transfer rate and easy diffusion of electrolyte provided by the novel 3D porous NiCo-LDH nanosheets on the conductive MXene substrate. Therefore, MXene/NiCo-LDH composites will be a candidate for electrochemical detection of glucose.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 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）