JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Hongjun Fang,Yusong Pan,Minyun Yin,Linfeng Xu,Yuan Zhu,Chengling Pan
Ternary Ti 3 C 2 –OH/ln 2 S 3 /CdS composites with an efficient visible-light-driven photocatalytic performance have been prepared via a facile hydrothermal synthesis method. The photo-degradation experiments verified that Ti 3 C 2 –OH/ln 2 S 3 /CdS composite with a large surface area of 68.2 m 2 /g exhibited an enhanced photocatalytic activity and adsorption capacity towards Rhodamine B under visible light irradiation , which was higher than that of the naked CdS and ln 2 S 3 , respectively. Furthermore, Ti 3 C 2 –OH/ln 2 S 3 /CdS composite showed robust degradation efficiency for mixture dyes of RhB and Methyl Orange (MO), and its catalytic ability was superior to that of ternary GO/ln 2 S 3 /CdS composite. The trapping experiments for active species revealed that hole (h + ) and • O 2 − species played a critical role in the removal of organic pollutants. In summary, the enhanced photocatalytic performance of Ti 3 C 2 –OH/ln 2 S 3 /CdS photocatalyst was derived from an excellent charge carrier separation and transfer of Ti 3 C 2 –OH MXene and the synergistic effect between CdS and ln 2 S 3 which resulting in strong visible light response.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Ben Ren,Jiaqi Yang,Zhengtao Feng,Bihe Yuan
Developing thermoplastic polyurethane (TPU) composites with excellent fire-safe properties is greatly significant to expand the application fields. Two-dimensional MXene has been proven effective in reducing fire hazards of TPU whereas its poor dispersion in TPU is a serious concern. Herein, benzyl trimethyl ammonium chloride and victoria blue B modified Ti 3 C 2 were synthesized through interface engineering methods and TPU composites were prepared via severally introducing the two modified Ti 3 C 2 by solvent mixing and hot pressing measures. No apparent agglomeration is observed, suggesting uniform dispersion of functionalized Ti 3 C 2 in TPU. The TPU composites present superior performances in flame retardancy and smoke suppression, and the distinguished fire safety can be attributed to the physical barrier and catalytic charring effect of functionalized Ti 3 C 2 and TiO 2 . This research presents a convenient way to obtain functionalized Ti 3 C 2 , enriching the future applications of MXene as flame retardant and reducing the fire hazards of TPU.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Wen Xiao,Huan Yu,Chenghao Xu,Zhongyi Pu,Xiangyu Cheng,Fang Yu,Chao Liu,Qinfang Zhang,Zhigang Zou
Developing high-efficiency photocatalysts for tetracycline hydrochloride (TCH) degradation is of great significance to ecosystems and human beings. In this work, a two-step process of exfoliation and re-stacking was performed to prepare re-stacked HTiNbO 5 nanosheets (R-HTNS) and then coupled with Ti 3 C 2 MXene to construct Ti 3 C 2 MXene/R-HTNS (MX/RTS) with a 2D/2D Schottky heterojunction. These 2D/2D heterostructures between Ti 3 C 2 MXene and R-HTNS can produce an internal electric field and provide maximum interface area for efficient charge transfer across the intimate interface. The photocatalytic performance of samples was evaluated by TCH degradation under simulated sunlight. The MX/RTS composites, with an optimal sample of 3-MX/RTS, show enhanced photocatalytic activity for TCH degradation compared with R-HTNS. The characterization results reveal that the introduction of Ti 3 C 2 MXene can significantly increase specific surface area for providing more reactive sites and broaden the light absorption region. Besides, the incident light energy is absorbed by the Ti 3 C 2 MXene component in MX/RTS composites to generate photothermal energy (heat), which facilitates the charge carrier separation and surface reaction kinetics. Thus, the enhanced TCH photodegradation activity for MX/RTS composites is due to the introduction of Ti 3 C 2 MXene, which possesses the synergistic effect of the increased specific surface area, improved light-harvesting capacity, 2D/2D Schottky heterojunction, and photothermal energy effect. Additionally, the TCH photodegradation behavior is deliberated with a detailed discussion on various coexisting ions. During TCH photodegradation, the active radical species are determined for 3-MX/RTS. According to the characterization results, the possible TCH photodegradation pathway and mechanism over 3-MX/RTS are explored. This work may offer a novel insight for constructing MXene-based heterostructured photocatalysts with high efficiency.
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CHEMOSPHERE
·
2023
·
IF 8.8
Hao Cheng,Liwen Zhang,Jun Feng,Tingfan Tang,Danfeng Qin
A novel, sensitive Ti 3 C 2 MXene/Co 3 O 4 /carbon nanofibers (Ti 3 C 2 MXene/Co 3 O 4 /CNFs) composite was synthesized via a HF exfoliating Ti 3 AlC 2 strategy, followed by doping Co 3 O 4 and Ti 3 C 2 MXene into the CNFs via a combination electrospinning and thermal annealing process. Ti 3 C 2 MXene/Co 3 O 4 /CNFs composite exhibits higher catalytic effect, conductivity, chemical stability, and electrochemical performance than Co 3 O 4 and Ti 3 C 2 MXene in electrochemical impedance, differential pulse stripping voltammetry, chronocoulometry, and cyclic voltammetry tests. This Ti 3 C 2 MXene/Co 3 O 4 /CNFs hybrid modified electrode provides fast analysis of 4-aminophenol (4-AP) with ultrahigh sensitivity, enhanced reproducibility and strong anti-interference capability. Furthermore, the level of 4-AP was quantified by this electrode with a wide linear range from 0.5 to 150 μM (R 2 > 0.99) and a low detection limit about 0.018 μM was achieved. Finally, the fabricated electrode was used for fast and sensitive analysis of 4-AP spiked in tap water and blood serum samples. This work presents the new Ti 3 C 2 MXene/Co 3 O 4 /CNFs electrode provides a platform for 4-AP monitoring and has the advantages of high selectivity , accuracy, simplicity, and rapid analysis.
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PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Xiaomeng Li,Shuxue Zhou
Modification of MXene is usually necessary for their application in corrosion resistant coatings. Nevertheless, the influence of the grafting degree of modifier is not concerned in the past. In this work, modified Ti 3 C 2 nanosheets (G-Ti 3 C 2 ) with different grafting degree of (3-glycidyloxypropyl)trimethoxysilane (GPS) were obtained by changing GPS dosage, and further incorporated into waterborne epoxy resin coatings (WEP). GPS modification led to deteriorated dispersion in water but improved dispersion stability of Ti 3 C 2 nanosheets in waterborne epoxy resin at appropriate GPS-grafting degree presumably due to the interaction between the liquid epoxy resin droplet and G-Ti 3 C 2 nanosheets. The GPS grafting degree was also critical to get the corrosion resistant nanocomposite coatings . The best corrosion resistance, i.e., with impedance modulus four orders of magnitude higher than that of pure WEP after 30 days' immersion in salt solution as well as the lightest corrosion in salt spray test, was achieved using the Ti 3 C 2 nanosheets modified at the GPS-to-Ti 3 C 2 mass ratio of 30:1. Better dispersion of G-Ti 3 C 2 nanosheets and stronger interaction between epoxy resin matrix and G-Ti 3 C 2 nanosheets should be responsible for the excellent corrosion resistance of the coatings at optimum GPS grafting degree.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Jianfang Li,Zhenxing Yang,Chaofeng Wang,Shuilin Wu,Yufeng Zheng,Zhenduo Cui,Hui Jiang,Zhaoyang Li,Shengli Zhu,Liheng Feng,Xiangmei Liu
Photocatalytic materials are one of the most promising alternatives of antibiotics for wound disinfection, and the bacteria-killing efficacy is restrained by photocatalytic performance. Herein, Ti 3 C 2 MXene-anchored 2D metal-organic frame (MOF) nanosheets were constructed to enhance the photocatalytic performance through interface engineering strategy by in-situ growth of 2D MOF on Ti 3 C 2 nanosheets. On the one hand, the close contact between them decreased the bandgap of 2D MOF, improving the yield of photogenerated electrons. On the other hand, it not only provided a rapid electron transfer channel across the interface but also induced the formation of Schottky junction at the interface. Consequently, the separation efficiency of photo-generated electron-hole pairs was significantly enhanced by rapid transfer and inhibition of electron backflow. Thus, under 660 nm plus 808 nm light, MOF/Ti 3 C 2 killed 99.73 ± 0.12% of Staphylococcus aureus . This work will provide insights for designing photo-responsive materials through in-situ interfacial engineering strategies.
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ChemistrySelect
·
2023
·Vol. 8
·期 48
·e202303437
·
IF 2.1
Ms. Menghan Li,Xuan Luo,Tongming Su,Xinling Xie,Hongbing Ji,Zuzeng Qin
Graphical Preparation of NiZr/N-doped TiO 2 /Ti 3 C 2 catalyst for catalytic cinnamaldehyde (CAL) hydrogenation by KBH 4 reduction. N-doped TiO 2 on Ti 3 C 2 , and N-doping substituted O in the TiO 2 lattice to create oxygen vacancies on the surface, increase the surface acidity, and adsorb C=O bonds, which resulted in high cinnamaldehyde conversion and cinnamyl alcohol (COL) selectivity after reaction 8 h. An NiZr/N-doped TiO 2 /Ti 3 C 2 catalyst was prepared by KBH 4 reduction for cinnamaldehyde hydrogenation. Characterization results showed that the synthesis of N-doped TiO 2 on Ti 3 C 2 and the uniform dispersion of TiO 2 on the Ti 3 C 2 surface increased the specific surface area of NiZr/Ti 3 C 2 by 164.4 m 2 /g. N-doping at a level of 19.03 % was used to replace O in the TiO 2 lattice; the Ti−O−Ti peak in the XPS spectrum of the undoped catalyst was shifted by 0.3 eV in the spectrum of the doped catalyst; as a result, there was a 15.40 % increase in the number of surface oxygen vacancies of the NiZr/Ti 3 C 2 catalyst. The synthesis of N-doped TiO 2 on Ti 3 C 2 converted the moderately acidic sites of NiZr/Ti 3 C 2 to strong Lewis acid sites and increased the total number of acid sites by approximately 0.8-fold. The active Lewis acid sites on the surface of NiZr/N-doped TiO 2 /Ti 3 C 2 adsorbed only C=O bonds and inhibited the adsorption of C=C bonds, resulting in a high cinnamaldehyde conversion of 90.69 % and a cinnamyl alcohol selectivity of 91.87 %.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Chao Liu,Wen Xiao,Xingyu Liu,Qiang Wang,Jiawei Hu,Siyuan Zhang,Jianguang Xu,Qinfang Zhang,Zhigang Zou
As a highly toxic heavy metal, Cr(VI) reduction by developing high-efficiency photocatalysts is of great significance. Herein, we firstly design few-layer Ti 3 C 2 MXene (FTM) by the hand-operated shaking, showing dual advantages of structural stability and more exposed reactive sites. Then, a refluxed process is performed to fabricate FTM/CaIn 2 S 4 (FTC) composites, where 2D CaIn 2 S 4 (CIS) nanoplates are closely connected with 2D FTM to form Schottky junction. The optimal 1-FTC with the FTM/CIS mass ratio of 1 wt.% exhibits the highest activity toward photocatalytic Cr(VI) reduction under visible light. It is well elucidated that the broadened light absorption range and promoted charge carrier separation rate induced by the introduction of FTM are responsible for improving photocatalytic activity of CIS. During Cr(VI) photoreduction, 1-FTC possesses excellent photo-stability and reusability. The effects of catalyst mass, coexisting ions, water sources and pH values on the Cr(VI) photoreduction efficiency are investigated. Photogenerated • O 2 − and e − are the main radical species accounting for Cr(VI) photoreduction over 1-FTC. The photocatalytic mechanism along with Cr(VI) removal pathway is exploited. This work may provide some insights into constructing FTM-based Schottky junctions for the efficient water purification.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Fangxian Wang,Shihao Li,Junwen Liang,Yuwei Wang,Haoran Song,Junwei Yang,Xuelin Zou,Changping Li
The pollution of heavy metal ions in water seriously affects the ecosystem and human health. Here, an efficient synergetic photocatalytic-photothermal system is designed by combining a mildly oxidized Ti 3 C 2 (mo-Ti 3 C 2 ) with a super hydrophilic bamboo fiber (BF) membrane. The mo-Ti 3 C 2 heterojunction promotes the transfer and separation of photoinduced charges and thus enhances the photocatalytic reduction of heavy metal ions (Co 2+ , Pb 2+ , Zn 2+ , Mn 2+ and Cu 2+ ). The photoreduced metal nanoparticles with high conductivity and LSPR effect further accelerate the transfer and separation of photoinduced charges, and improve photothermal and evaporative performance. The mo-Ti 3 C 2 -2.4 @BF membrane in Co(NO 3 ) 2 solution can achieve an excellent evaporation rate of 4.6 kg·m −2 ·h −1 and a high solar-vapor efficiency of up to 97.5% under the light intensity of 2.44 kW·m −2 , which are 27.8% and 19.6% higher than those in H 2 O, respectively, demonstrating the reuse of photoreduced Co nanoparticles. No heavy metal ions are detected in any of the condensed water, and the Co 2+ removal rate in the concentrated Co(NO 3 ) 2 solution is up to 80.4%. The synergetic photocatalytic-photothermal approach on the mo-Ti 3 C 2 @BF membrane provides a new scope for the continuous removal and reuse of heavy metal ions, as well as for obtaining clean water.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yingnan Yang,Haifeng Yang,Pengfei Tang,Xiaodong Li,Weimiao Wang,Guangcheng Yang
Laser induced high temperature pulse (HTP) generation has been widely used in some high-immediacy applications requiring dramatic temperature changes. Recent years researchers put interest in light-to-heat (include photothermal, light induced exothermic reaction and combination of both) materials to reduce the initiating energy of the laser ignition. However, the laser energy for realizing sufficient light-to-heat conversion is still high. MXene exhibits excellent light absorption, high light-to-heat conversion efficiency and has abundant metastable atoms which trend to undergo exothermic chemical reactions, but its incomplete oxidation affects its total heat release when the laser power is relatively high. Herein, we have prepared a ZIF-67/Ti 3 C 2 MXene intercalated membrane. It is found that porous ZIF-67 exhibits a synergistic effect on MXene and can significantly improve its physical/chemical coupled HTP by enhancing its light absorption and subsequent energy release during its oxidation. ε 2,4,6,8,10,12-(hexanitrohexaaza) cyclododecane (ε-CL-20) laser ignition experiments prove that ZIF-67/Ti 3 C 2 MXene intercalated membrane exhibits better ignition performance than pure MXene membrane by reducing both ignition threshold (151.2 mJ) and ignition delay (21 ms) at a low laser power intensity (59.7 W/cm 2 ). This work can provide an insight for the structural design of new light-to-heat membranes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chao Liu,Wen Xiao,Guiyun Yu,Qiang Wang,Jiawei Hu,Chenghao Xu,Xinyi Du,Jianguang Xu,Qinfang Zhang,Zhigang Zou
Developing efficient heterojunction photocatalysts that have a high charge carrier separation rate and improved light-harvesting capacity is a crucial step in solving energy crisis and reducing environmental pollution. Herein, we synthesized few-layered Ti 3 C 2 MXene sheets (MXs) by a manual shaking process, and combined with CdIn 2 S 4 (CIS) to construct novel Ti 3 C 2 MXene/CdIn 2 S 4 (MXCIS) Schottky heterojunction through a solvothermal method. The strong interface between two-dimensional (2D) Ti 3 C 2 MXene and 2D CIS nanoplates led to enhanced light-harvesting capacity and promoted charge separation rate. Additionally, the presence of S vacancies on the MXCIS surface helped to trap free electrons. The optimal sample, 5-MXCIS (with 5 wt% MXs loading), exhibited outstanding performance for photocatalytic hydrogen (H 2 ) evolution and Cr(VI) reduction under visible light due to the synergistic effect of enhanced light-harvesting capacity and charge separation rate. The charge transfer kinetics was thoroughly studied using multiple techniques. The reactive species of • O 2 − , • OH and h + were generated in 5-MXCIS system, and e − and • O 2 − radicals were found to be the main contributors to Cr(VI) photoreduction. Based on the characterization results, a possible photocatalytic mechanism for H 2 evolution and Cr(VI) reduction was proposed. On the whole, this work provides new insights into the design of 2D/2D MXene-based Schottky heterojunction photocatalysts for boosting photocatalytic efficiency.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 13
·6934-6944
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IF 11.9
Yuxiao Yang,Jianyun Zhao,Jiuhong Wang,Yinhuan Li,Wei Yu,Shujiang Ding
Magnetic MXene-based composites have been extensively developed for highly effective electromagnetic (EM) wave absorption. However, previously reported studies neglected the influence of regulating primary dissipation sources and electron migration on absorption performance. This is probably due to the fact that the present modification methods frequently severely oxidize MXenes, obliterating the electron migration pathway. Here, a facile strategy is developed to create sandwich-like m-Ti3C2/Fe3O4 (MTF) composites by electrostatic assembly. The room temperature assembly process prevents oxidation and safeguards the in-plane electron migration path of m-Ti3C2. This makes it possible to reveal the mechanism by which increased Fe3O4 content inhibits electron migration, lowers attenuation capacity, and leads to increasing impedance-matching thickness. More importantly, we provide the first explanation of the absorption band transfer phenomenon. Additionally, at a thickness of 2.96 mm, the as-prepared MTF composites exhibit exceptional EM wave absorption capacity, reaching −77.5 dB with an effective absorption band of 3.0 GHz. The comprehensive insight presented in this work offers a solid theoretical foundation for an in-depth understanding of the influence of electron hopping behaviors on electromagnetic characteristics and, consequently, EM wave absorption performance, which further offers an essential roadmap to fabricate high-performance absorbers.
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