Crystals
·
2023
·Vol. 13
·期 7
·1005
·
IF 2.7
Zhiwei Liu,Guanlong Li,Yan Zhao,Xiangbao Chen
The rapid development of electronic technology has brought convenience and efficiency to the lives of modern people, while emphasizing the need for novel materials with designability and excellent dielectric properties at the same time. In this work, Ti3C2TxMXene nanosheets (MNSs) underwent NH3·H2O solvothermal treatment at temperatures of 40 °C, 60 °C, 80 °C, 100 °C, 120 °C, 140 °C, 160 °C, and 180 °C. The changes in the surface groups and dielectric properties after the solvothermal treatment were studied. The solvothermal treatment increased the proportion of surface -OH groups, which was beneficial to the permittivity of the MNSs. However, as the treating temperature increased, the amount of -OH on the surface of the MNSs showed a reducing trend, according to XPS spectra. As the treating temperature rose from 40 °C to 80 °C, the real part of the permittivity of MNS sample showed a significant decrease, eventually remaining approximately stable in the 80 °C to 180 °C samples. The results of electromagnetic characterization were in line with the group proportion, as determined via the XPS O1s spectra, supporting the previous conclusion that the -OH group played an important role in the permittivity.Keywords:NH3·H2O solvothermal;end groups;dielectric property;2D nanosheets
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ziquan Wang,Zheng Li,Bo Yong,Haiyan Huang,Lei Yao,Libo Deng
Membrane distillation (MD) is a promising technology with great potential to mitigate the crisis of water shortage. However, it still suffers from the low productivity due to that water vaporization on the membrane would reduce the transmembrane temperature and hence the permeate flux. Herein, an electrothermal membrane that can heat the feed solution on the membrane and hence enables the MD operation under a low electrical input was developed. This was achieved by coating a commercial PET-PTFE membrane with MXene nanosheets through a filtration method. The resultant MXene/PET-PTFE composite membrane could heat the surroundings (both air and brine) efficiently, showing a conversion efficiency of 73% at 1 W. Furthermore, it was shown that the composite membrane, while degrades rapidly in highly ionizable brine under a direct current (d.c.) input, could work stably over a long duration at high potential under high-frequency alternating current (a.c.) input. Systematic electrochemical impedance spectroscopic investigation suggested that the reciprocal vibration of ions under a high-frequency a.c. could inhibit the formation of electrical double layer, and thus depresses the electrochemical oxidation of MXene and water splitting. Furthermore, the composite membrane enabled efficient in-situ heating in a Joule heating MD (JHMD) system, delivering a permeate flux of 1.8 kg m −2 h −1 at an input power of 3 W, which is 333% higher than that based on the conventional MD process. Theoretical simulation of the temperature distribution by a finite element method (FEM) confirmed a higher transmembrane temperature in the JHMD system than in the conventional MD, which is responsible for the performance enhancement.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xuteng Xing,Yating Sui,Qiushi Li,Miao Yuan,Hantuo Zhao,Dan Zhou,Xiaomeng Chu,Shaojie Liu,Erjun Tang
Two-dimensional Ti 3 C 2 T x MXene is a promising anticorrosive filler for epoxy coating, but only passive protection makes Ti 3 C 2 T x -based composite coating unable to meet long-term anticorrosive requirements. For this reason, the ZnAl-NO 3 LDH layers and active corrosion inhibitor MoO 4 2- are introduced into Ti 3 C 2 T x MXene surface, where LDH layers cannot only be used as the acid response nanocontainer for MoO 4 2- , but also an additional active corrosion inhibitor, and a reservoir to trap Cl - . The obtained ZnAl-MoO 4 LDH@Ti 3 C 2 T x MXene composite corrosion inhibitor is an acid-response and active/passive protective dual-functional composite corrosion inhibitor. The ZnAl-MoO 4 LDH@Ti 3 C 2 T x MXene contained composite coating can exhibit the excellent anticorrosion performance and certain self-healing property, owing to the synergistic effect including the physical shielding effect of two-dimensional Ti 3 C 2 T x MXene, Cl - adsorption/capture effect of hydrotalcite, and inhibition membrane formation of Zn 2+ and MoO 4 2- in the composite corrosion inhibitor. This work is of great significance to the synthesis of multifunctional composite corrosion inhibitors and the application of Ti 3 C 2 T x MXene-based composite coatings in the field of corrosion protection.
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Materials Horizons
·
2023
·Vol. 10
·期 6
·2262-2270
·
IF 13.3
Renjie Ding,Jinhua Xiong,Qian Yan,Zhong Chen,Zonglin Liu,Xu Zhao,Qingyu Peng,Xiaodong He
Acid rain is a worldwide problem because of the emission of acidic gases into the atmosphere, leading to the acidification of first-order streams and aggravation of fresh water shortage. Therefore, it is of great importance to develop an environmentally friendly method for removing acid from water. Herein, an advanced technology that can achieve aqueous acid purification using solar energy is realized with Ti3C2Tx MXene/polyaniline (PANI) hybrid non-woven fabrics (MPs) through interfacial solar vapor generation, with PANI acting as an acid absorber through the doping process. Benefiting from the porous structure and crumpled micro-surface of MPs, a high evaporation rate of 2.65 kg m−2 h−1 with an efficiency of 93.7% can be achieved under one-sun illumination. Moreover, MPs present an even higher evaporation rate of 2.83 kg m−2 h−1 in high concentration aqueous acid and can generate clean water with a pH higher than 6.5. More importantly, thanks to the unique reversible doping process of PANI, when used as an aqueous acid purifier, MPs show good stability and reusability after dedoping. Our work sheds light on an efficient strategy for dealing with aqueous acid and acid rain.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Fan Chen,Jinhao Wang,Lijuan Chen,Haoliang Lin,Dongxue Han,Yu Bao,Wei Wang,Li Niu
Wearable, noninvasive sensors enable the continuous monitoring of metabolites in sweat and provide clinical information related to an individual’s health and disease states. Uric acid (UA) is a key indicator highly associated with gout, hyperuricaemia, hypertension, kidney disease, and Lesch–Nyhan syndrome. However, the detection of UA levels typically relies on invasive blood tests. Therefore, developing a wearable device for noninvasive monitoring of UA concentrations in sweat could facilitate real-time personalized disease prevention. Here, we introduce 1,3,6,8-pyrene tetrasulfonic acid sodium salt (PyTS) as a bifunctional molecule functionalized with Ti3C2Tx via π–π conjugation to design nonenzymatic wearable sensors for sensitive and selective detection of UA concentration in human sweat. PyTS@Ti3C2Tx provides many oxidation–reduction active groups to enhance the electrocatalytic ability of the UA oxidation reaction. The PyTS@Ti3C2Tx-based electrochemical sensor demonstrates highly sensitive detection of UA in the concentration range of 5 μM–100 μM, exhibiting a lower detection limit of 0.48 μM compared to the uricase-based sensor (0.84 μM). In volunteers, the PyTS@Ti3C2Tx-based wearable sensor is integrated with flexible microfluidic sweat sampling and wireless electronics to enable real-time monitoring of UA levels during aerobic exercise. Simultaneously, it allows for comparison of blood UA levels via a commercial UA analyzer. Herein, this study provides a promising electrocatalyst strategy for nonenzymatic electrochemical UA sensor, enabling noninvasive real-time monitoring of UA levels in human sweat and personalized disease prevention.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Miao Lei,Junpeng Guo,Qinkai Chen,Chang Liu,Bolin Li,Ye Li
There are abundant uranium resources in salt lake brines, but the high salinity background brings huge challenges to the selective extraction of uranyl. In this work, a novel Ti 3 C 2 T x nanocomposite was constructed by the intercalation of guanidine phosphate (GP) to achieve the selective and effective uranyl extraction. Characterization analyses showed that the intercalation of GP was driven by ion exchange or electrostatic interaction. At the temperature of 35 °C, the adsorption of GP-Ti 3 C 2 T x quickly reached equilibrium after 2 h (q max = 270.7 mg/g). Mechanism investigations showed that the adsorption of uranyl on GP-Ti 3 C 2 T x mainly included electrostatic attraction of oxygen-containing functional groups, chemical reduction by GP, and the coordination of phosphate and guanidine groups. Noteworthy, the adsorption capacity of GP for trace uranium (296.3 ± 13.8 μg/L) in actual brine was 806.3 μg/g. Even if the concentrations of coexisting Na + , K + , Mg 2+ , Ca 2+ , VO 4 3− and SO 4 2− far exceeded the concentration of salt lake sample, GP-Ti 3 C 2 T x exhibited satisfactory selectivity. Overall, this novel Ti 3 C 2 T x nanocomposite provides new insights into the extraction of uranium from salt lake brines.
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TALANTA
·
2024
·
IF 5.6
Haozi Lu,Junhua Wang,Ziyi Wu,Meiqing Yang,Wei Zhou,Ye Li,Huimin Li,Yang Zhang,Jifei Yang,Gang Yu,Song Liu
Sweat lactate levels are closely related to an individual's physiological state and serve as critical indicators for assessing exercise intensity, muscle fatigue, and certain pathological conditions. Screen-printed electrodes (SPEs) offer a promising avenue for the development of low-cost, high-performance wearable devices for electrochemical sweat analysis. The material composition of SPEs significantly impacts their detection sensitivity and stability. In this study, we designed a screen-printed carbon electrode (SPCE) modified with Ti 3 C 2 T x Polydopamine (PDA), and silver nanoparticles (AgNPs) (Ti 3 C 2 T x -PDA-AgNPs) for lactate detection in sweat. The accordion-like structure of Ti 3 C 2 T x provides a large specific surface area and exceptional electrical conductivity. PDA, acting as both a reducing agent and binder, supports the in-situ formation of AgNPs on the Ti 3 C 2 T x nanosheets. These AgNPs prevent the restacking of Ti 3 C 2 T x layers, further improving conductivity. The sensor exhibited sensitivities of 0.145 μA mM −1 , with limit of detection (LOD) of 0.181 mM (S/N = 3) in phosphate-buffered saline (PBS), meeting the requirements for for sweat lactate detection. The sensor was integrated into a wearable micro-electrochemical platform paired with a custom Android application for real-time sweat analysis. Testing on human sweat demonstrated the platform's potential for practical fitness monitoring and healthcare diagnostics applications.
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ACS Nano
·
2017
·
IF 13.942
Li Zhao,Biliang Dong,Shaozhou Li,Lijun Zhou,Linfei Lai,Zhiwei Wang,Shulin Zhao,Min Han,Kai Gao,Min Lu,Xiaoji Xie,Bo Chen,Zhengdong Liu,Xiangjing Wang,Hao Zhang,Hai Li,Juqing Liu,Hua Zhang,Xiao Huang,Wei Huang
Two-dimensional (2D) metal–organic framework (MOF) nanosheets have been recently regarded as the model electrocatalysts due to their porous structure, fast mass and ion transfer through the thickness, and large portion of exposed active metal centers. Combining them with electrically conductive 2D nanosheets is anticipated to achieve further improved performance in electrocatalysis. In this work, we in situ hybridized 2D cobalt 1,4-benzenedicarboxylate (CoBDC) with Ti3C2Tx (the MXene phase) nanosheets via an interdiffusion reaction-assisted process. The resulting hybrid material was applied in the oxygen evolution reaction and achieved a current density of 10 mA cm–2 at a potential of 1.64 V vs reversible hydrogen electrode and a Tafel slope of 48.2 mV dec–1 in 0.1 M KOH. These results outperform those obtained by the standard IrO2-based catalyst and are comparable with or even better than those achieved by the previously reported state-of-the-art transition-metal-based catalysts. While the CoBDC layer provided the highly porous structure and large active surface area, the electrically conductive and hydrophilic Ti3C2Tx nanosheets enabled the rapid charge and ion transfer across the well-defined Ti3C2Tx–CoBDC interface and facilitated the access of aqueous electrolyte to the catalytically active CoBDC surfaces. The hybrid nanosheets were further fabricated into an air cathode for a rechargeable zinc–air battery, which was successfully used to power a light-emitting diode. We believe that the in situ hybridization of MXenes and 2D MOFs with interface control will provide more opportunities for their use in energy-based applications.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Kai-Ning Zhang,Ze-Le Lei,Qiu-Feng Lü
The intensification of industrial production has led to a sharp increase in the discharge of toxic organic chemicals and wastewater from printing and dyeing industry. In this study, flower-like ZnO modified TiO 2 @Ti 3 C 2 T x composites (ZnO/TiO 2 @Ti 3 C 2 T x ) were prepared by in-situ oxidation solvothermal method from zinc nitrate hexahydrate and tetramethylammonium hydroxide intercalated Ti 3 C 2 T x . During the solvothermal processes, sodium hydroxide acted as an etchant to further exfoliated the accordion-like Ti 3 C 2 T x into single or few-layer; and at the same time, TiO 2 was formed in-situ on the surface of Ti 3 C 2 T x with simultaneous deposition of flower-like ZnO. The layer structural Ti 3 C 2 T x facilitates the loading and dispersion of ZnO and TiO 2 on its surface. After the in-situ oxidation by solvothermal method, TiO 2 was evenly distributed on the surface of Ti 3 C 2 T x , adjusting the functional groups on the surface of the ZnO/TiO 2 @Ti 3 C 2 T x composite, and improving its adsorption performance. ZnO/TiO 2 @Ti 3 C 2 T x can be used as an efficient adsorbent for malachite green with a high maximum adsorption capacity of 1232.7 mg g −1 , which is higher than that of TiO 2 @Ti 3 C 2 T x (628.57 mg g −1 ). Moreover, a superhydrophilic and underwater superoleophobic ZnO/TiO 2 @Ti 3 C 2 T x @PU sponge was prepared by loading ZnO/TiO 2 @Ti 3 C 2 T x onto polyurethane (PU) sponge. The introduction of ZnO enhances the surface roughness of the ZnO/TiO 2 @Ti 3 C 2 T x @PU sponge, which can effectively separate six oil-water mixtures, and has a high separation flux of 171784 L m −2 h −1 and separation efficiency of 99.6% for cyclohexane-water mixture.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Xu Yuying,Chen Lijuan,Guo Xiaohui,Zhang Jian,Guo Xiaobing,He Ziqian,Zhang Jiani,Han Dongxue
A label-free photoelectrochemical (PEC) biosensing strategy was constructed based on a Cu 2 MoS 4 @Ti 3 C 2 T x MXene heterojunction for the sensitive detection of tetracycline (TC) in milk. The Cu 2 MoS 4 @Ti 3 C 2 T x MXene heterojunction substantially facilitates the separation of photogenerated electron–hole pairs, a key element in enhancing the photocurrent response. Cu 2 MoS 4 , renowned for its visible-light absorption and photocatalytic properties, is combined synergistically with Ti 3 C 2 T x MXene, contributing a large surface area and outstanding electrical conductivity. The heterojunction not only elevates photocatalytic efficiency but also provides abundant π–π stacking sites on the surface of Ti 3 C 2 T x MXene. These sites enable the direct immobilization of the TC aptamer without chemical modification, thereby minimizing marker interference and improving the detection accuracy. Furthermore, the heterojunction structure broadens the light-absorption spectrum and enhances charge-transfer efficiency, resulting in a higher photocurrent response. The proposed PEC aptasensor demonstrates a favorable linear response to TC within the concentration range 5 to 300 nM, with a detection limit of 1.24 nM. These results are comparable to those achieved by high-performance liquid chromatography. This study is expected to pioneer a novel approach for the design of a label-free PEC aptasensor applicable to the bioanalysis of food samples. Graphical abstract
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
Dong Chaoyang
To improve anti-icing traits of outdoor coatings, a synergy between photothermal and hydrophobic anti-icings was utilized to fabricate copolymer/Ti 3 C 2 T x MXene composite coatings with good transparency and adhesion. MXene contributes to photothermal trait from local surface plasmon resonance effect. Copolymer enables hydrophobicity from perfluoroalkyls-induced low surface energy and high surface roughness. An increase in MXene dose results in an increased surface roughness. With 140.0 ± 2.2° of water contact angle and 70% of light transmittance, the optimal film bears 2 wt% of MXene. High MXene dose results in large temperature-increase of film under sunlight. After 15 min of sunlight exposure, the temperature of optimal film surface in icing simulation increases from − 18 ℃ to 7.2 ℃. After 48 h of acid immersion, the temperature-increase of optimal film surface based on 300 s of sunlight irradiation reaches 28.7 ± 1.2 ℃. After 48 h of ultraviolet irradiation, the temperature-increase of optimal film surface is 30.7 ± 0.8 ℃. This surface has a water contact angle of 132.7 ± 1.1° after 48 h of acid immersion. This study gives impetus to a preparation of various composite coatings for outdoor anti-icing/deicing.
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Materials Today Sustainability
·
2024
·
IF 7.1
Wentao Huang,Jie Xia,Zhigang Li,Xiaoshuan Zhang
The pursuit of simple, cost-effective, and efficient flexible ammonia sensors is an area of keen interest. This study aimed to create a highly sensitive, affordable flexible sensing patch (FDP) for immediate ammonia and impedance monitoring. Using a laser direct writing technique, symmetrical graphene patterns were crafted onto commercial kapton tape. These patterns were folded in half, allowing the lower layer to serve as an impedance sensor and the upper layer as an electrode for ammonia detection. The modified Ti 3 C 2 T x MXene solution was introduced as the sensitive layer in response to ammonia gas, and we also explored how varying thicknesses of this sensitive layer affected the response results. Notably, the results highlighted that FDPs with two thicknesses (50 μL solution) offered optimal ammonia detection. With a detection limit of 150 ppb, impressive sensitivity (18.08%/ppm), exceptional linearity (0.996), and stability within the 0.5 ppm–20 ppm range, the overall performance of the FDP surpassed that of most reported ammonia sensor devices based on graphene materials. FDP was able to better characterize the shelf life of lamb at a cost of no more than $1.5. This study provides solutions for rapid ammonia detection and food quality assessment .
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