JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Xiao Yang,Minghui Feng,Jianfei Xia,Feifei Zhang,Zonghua Wang
A novel electrochemical biosensor based on AuNPs/Ti 3 C 2 MXene three-dimensional nanocomposite for sensitive miRNA-155 detection by exonuclease III (Exo III)-aided cascade target recycling is reported. Ti 3 C 2 MXene is synthesized and used as a support to immobilize Au nanoparticles (AuNPs) due to its special layered structure and metallic properties. The three-dimensional (3D) structure of the AuNPs/Ti 3 C 2 MXene nanocomposite for the biosensor platform leverages the integrated advantages of a large specific surface area, excellent electrical conductivity and electrocatalytic properties . AuNPs are used to immobilize capture DNA (C-DNA) by Au S chemical bonds. The C-DNA was modified with methylene blue (MB) at the 3′ end, resulting in an initial DPV electrochemical signal ( I d ). In the presence of target, miRNA-155 and C-DNA formed a double-stranded structure by complementary base pairing. Subsequently, Exo III digested the 3′ end of the C-DNA in the double-stranded structure and caused the electrochemical signal to “turn off” (the final signal denoted as I h ). By Exo III-aided cascade cleavage of the target, one miRNA-155 chain causes the release of several C-DNAs under certain conditions, which significantly amplifies the peak current difference on the fabricated biosensor (Δ I = I d ﹣ I h ). The electrochemical sensor achieved a detection limit of 0.35 fM (S/N = 3) with a linear range from 1.0 fM to 10 nM. This sensor also shows desirable stability, reproducibility and specificity.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wenqiang Liu,Meng Zhou,Heqing Fu
A ternary Ag@ZnO@Ti 3 C 2 MXene heterojunction (AZM) is synthesized by hybridizing ZnO and Ag nanoparticles with the MXene via a simple hydrothermal and chemical deposition method. The addition of ZnO and Ag can effectively compensate for MXene’s narrow bandgap property, promote charge carrier separation, and improve visible light absorption , thereby enhancing photocatalytic activity. The photocatalytic activity of the AZM is evaluated through the removal efficiency of methylene blue (MB) dye and levofloxacin (LVX) under visible light irradiation. The results show that the optimized ternary AZM heterojunction photocatalysts (AZM-15) possesses the maximum degradation of MB (90.54%) with a reaction rate constant of 0.0473 min −1 , while the maximum degradation of LVX (86.76%) has a reaction rate constant of 0.0408 min −1 . Moreover, the AZM composite exhibits excellent stability, which explains its MB removal rate of 83.59% and LVX removal rate of 80.03% after five cycles. The results of trapping experiments and EPR demonstrated that the main active species in the MB and LVX photodegradation process are·OH and·O 2 - . This work not only elucidates a possible mechanism of photocatalytic degradation of organic pollutants but also provides a pathway to design new bandgap photocatalysts for mitigating environmental pollution .
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FOOD CHEMISTRY
·
2024
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IF 8.5
Fei Wang,Yao Zhu,Long Qian,Yuhao Yin,Ziyu Yuan,Yuting Dai,Tao Zhang,Dongya Yang,Fengxian Qiu
Precisely detecting organophosphorus pesticides (OPs) is paramount in upholding human safety and environmental preservation, especially in food safety. Herein, an electrochemical acetylcholinesterase (AChE) sensing platform entrapped in chitosan (Chit) on the glassy carbon electrodes (GCEs) decorated with Pt/MoS 2 /Ti 3 C 2 MXene (Pt/MoS 2 /TM) was constructed for the detection of chlorpyrifos . It is worth noting that Pt/MoS 2 /TM possesses good biocompatibility, remarkable electrical conductivity , environmental stability and large specific surface area . Besides, the heterostructure formed by the composite of TM and MoS 2 improves the conductivity and maintains the original structure, which is conducive to improving the electrochemical property . The coordination effect between the individual components enables the even distribution of functional components and enhances the electrochemical performance of the biosensor (AChE-Chit/Pt/MoS 2 /TM). Under optimal efficiency and sensitivity, the AChE-Chit/Pt/MoS 2 /TM/GCE sensing platform exerts comparable analytical performance and a wide concentration range of chlorpyrifos from 10 −12 to 10 −6 M as well as a low limit of detection (4.71 × 10 −13 M). Furthermore, the biosensor is utilized to detect OPs concerning three kinds of fruits and vegetables with good feasibility and recoveries (94.81% to 104.0%). This work would provide a new scheme to develop high-sensitivity sensors based on the two-dimensional nanosheet/laminar hybrid structure for practical applications in environmental monitoring and agricultural product detection.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Lu Qian,Zuncai Gu,Mengting Liu,Tao Deng,Chenhao Zhang,Jing Qian,Xingyi Huang,Chengquan Wang
Heavy metals pose a significant threat to ecosystems and human health due to their toxicity and persistence. In this work, we developed a high-performance electrochemical sensor for simultaneous detection of Cd 2+ and Pb 2+ using a cost-effective pencil graphite electrode (PGE) modified with alkalized Ti 3 C 2 MXene (alk-MXene/PGE). Cyclic voltammetry and electrochemical impedance spectroscopy were utilized to examine the electrochemical characteristics of different PGEs. Studies revealed that the optimal PGE for subsequent application was the one with HB hardness and a diameter of 2 mm. Compared with bare PGE and Ti 3 C 2 MXene modified PGE, alk-MXene/PGE exhibited enhanced electrical conductivity and optimized electrochemical performance, enabling sensitive and simultaneous detection of Cd 2+ and Pb 2+ in a single run. Linear relationships were achieved for Cd 2+ in the range of 5.0 × 10 −4 ∼ 7.0 × 10 −2 mg/L and for Pb 2+ in the range of 2.0 × 10 −4 ∼ 8.0 × 10 −2 mg/L, with detection limits of 8.10 × 10 −6 mg/L and 9.12 × 10 −6 mg/L, respectively. The developed electrochemical sensor was successfully applied to scallop samples, demonstrating its good practicability. This study underscores the potential of alkalized Ti 3 C 2 MXene-modified PGEs in electrochemical sensing of Cd 2+ and Pb 2+ simultaneously, paving new avenues for food quality monitoring and environmental analysis.
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RENEWABLE ENERGY
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2025
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IF 9.1
Xu Ma,Wei-Wei Yang,Jia-Rui Zhang,Lan-Xin Liang
In this study, g-C 3 N 4 /Ti 3 C 2 MXene composite fabricated through covalent assembly is used as support material for dynamically trapping Co 0.1 Ce 0.1 Ni 0.8 trimetallic alloy (TA), with the goal of facilitating efficient interfacial reactions and ordered energy conversion for dry reforming of methane by photothermal coupling. By synergistically harnessing remarkable photothermal conversion efficiency of Ti 3 C 2 MXene and the robust light absorption capacity of g-C 3 N 4 , the proposed composite catalyst demonstrates a notable enhancement in methane conversion. At 600 °C, a high and stable methane conversion of over 71 % can be achieved under the same conditions. Also, the generalized hydrogen production rates are remarkably higher than those for other existing studies in published literature for temperature ranging from 400 to 600 °C. Besides, the distinctive characteristics inherent in the dynamic photo-thermal-electric-chemical conversion process of methane reforming are uncovered, and herein, the concept of a tri-interface dual-transport operational mechanism is introduced. The present findings can constitute a valuable reference for the gentle and efficient operation of methane reforming processes, as well as the elaboration and optimization of photothermal catalytic systems.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yitian Tang,Lu Qian,Chengquan Wang,Jing Qian,Yihan Wang
Accelerated industrialization has heightened heavy metal contamination in marine ecosystems, with filter-feeding bivalves like scallops accumulating these toxins, posing significant food safety risks. Conventional detection methods face limitations in cost and portability. In this work, we developed a novel in-situ growth strategy by utilizing alkalized Ti 3 C 2 MXene (alk-MXene) to enable the uniform formation of Bi nanobelts directly on its surface, a significant improvement over pristine Ti 3 C 2 MXene, attributed to the higher density of negatively charged hydroxyl groups on alk-MXene. On this basis, the in situ-grown Bi nanobelts on alk-MXene modified pencil graphite electrode (Bi@alk-MXene/PGE) was used for the electrochemical detection of Cd 2+ and Pb 2+ in a single run. Compared to the alk-MXene/PGE, the Bi@alk-MXene/PGE exhibited 1.4-fold and 1.2-fold higher peak current intensities for Cd 2+ and Pb 2+ , respectively, demonstrating its enhanced sensitivity for detection. Linear relationships were observed for Cd 2+ in the range of 1.0 × 10 −5 –5.5 × 10 −1 mg/L and Pb 2+ in 5.0 × 10 −4 –5.5 × 10 −1 mg/L, with detection limits of 1.72 × 10 −7 mg/L and 1.04 × 10 −6 mg/L based on S/N = 3, respectively. This sensor was successfully applied to scallop samples, validating its practicality for real-sample analysis. This work uniquely combined portability, affordability and ultra-sensitivity, offering an ideal solution to meet the growing demand for reliable heavy metal monitoring in food safety monitoring field.
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Small
·
2021
·Vol. 17
·期 50
·2103993
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IF 13.281
Zhaopu Yang,Xinliang Fu,Daichuan Ma,Yulin Wang,Liming Peng,Jiacheng Shi,Jiyu Sun,Xueqi Gan,Yi Deng,Weizhong Yang
Phototherapy has recently emerged as a competent alternative for combating bacterial infection without antibiotic-resistance risk. However, owing to the bacterial endogenous antioxidative glutathione (GSH), the exogenous reactive oxygen species (ROS) generated by phototherapy can hardly behave desired antibacterial effect. To address the daunting issue, a quad-channel synergistic antibacterial nano-platform of Ti 3 C 2 MXene/MoS 2 (MM) 2D bio-heterojunctions (2D bio-HJs) are devised and fabricated, which possess photothermal, photodynamic, peroxidase-like (POD-like), and glutathione oxidase-like properties. Under near-infrared (NIR) laser exposure, the 2D bio-HJs both yield localized heating and raise extracellular ROS level, leading to bacterial inactivation. Synchronously, Mo 4+ ions can easily invade into ruptured bacterial membrane, arouse intracellular ROS, and deplete intracellular GSH. Squeezed between the “ROS hurricane” from both internal and external sides, the bacteria are hugely slaughtered. After being further loaded with fibroblast growth factor-21 (FGF21), the 2D bio-HJs exhibit benign cytocompatibility and boost cell migration in vitro. Notably, the in vivo evaluations employing a mouse-infected wound model demonstrate the excellent photonic disinfection towards bacterial infection and accelerated wound healing. Overall, this work provides a powerful nano-platform for the effective regeneration of bacteria-invaded cutaneous tissue using 2D bio-HJs.
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PubMed
高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Jialin Pan,Meiling Zhang,Gege Fu,Li Zhang,Huimei Yu,Xu Yan,Fangmeng Liu,Peng Sun,Xiaoteng Jia,Xiaomin Liu,Geyu Lu
Although the advent of two-dimensional (2D) MXenes has substantially increased the family of 2D materials and diverse applications, the rational design of MXene-based composites and their specialized applications in theranostic biomedicine remain a challenge. In this work, we developed, for the first time, Ti3C2 MXene nanosheets for near-infrared (NIR)-IIb (1530 nm) and magnetic resonance (MR) imaging-guided photothermal therapy. Surface engineering and functionalization of 2D Ti3C2 MXene nanosheets with NaErF4:0.5%Tm@NaLuF4 (NaErF4) nanoparticles result in NaErF4@Ti3C2 composites that emit in the NIR-IIb region at 1530 nm under 808 nm excitation, conferring NIR-IIb imaging guidance and monitoring capabilities during tumor hyperthermia. Due to the inherent magnetic properties of the Er3+ ions, the NaErF4@Ti3C2 composite can also be used for efficient T2-weighted MR imaging. In particular, based on the high photothermal conversion capability (43.62% at 808 nm irradiation) and photothermal stability, the designed composites were further explored for efficient tumor ablation with an inhibition ratio of 92.9%, which was systematically demonstrated both in vitro and in vivo. No significant nanocomposite toxicity was observed at the injected dose. This work not only expands the performance of MXene-based multifunctional nanostructures but also highlights the promise of their versatile applications in cancer therapy.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Yuxuan Bai,Yu He,Manman Wang,Gongwu Song
Ti 3 C 2 MXene quantum dots (Ti 3 C 2 MQDs) are recognized as promising new nanomaterial recently, while the majority of the Ti 3 C 2 MQDs manifest limited maximum emission in the blue-light range. Herein, the green fluorescence nitrogen, phosphorus-doped Ti 3 C 2 MQDs (N, P-Ti 3 C 2 MQDs) were synthesized via facile microwave-assisted method, which greatly reduces the reaction time. The as-prepared N, P-Ti 3 C 2 MQDs showed excitation-dependent photoluminescence , anti-photobleaching, and favorable dispersibility . Interestingly, the fluorescence of N, P-Ti 3 C 2 MQDs can be quenched by 1,10-phenanthroline-Fe (II) complex (Phen-Fe 2+ ) via inner filter effect (IFE), accompanied by the increased orange color. After introduction of nitrite (NO 2 - ), owing to the redox reaction between NO 2 - and Fe 2+ , the fluorescence will be recovered and the color varies from orange to colorless gradually. Therefore, a colorimetric/fluorometric dual-modal recognition of NO 2 - was fabricated based on N, P-Ti 3 C 2 MQDs and Phen-Fe 2+ complex. Moreover, paper-based test trips were facilely made by the N, P-Ti 3 C 2 MQDs/Phen-Fe 2+ sensing system in response to ultrafast-response, real-time detection of NO 2 - with the assistant of smartphone. This study tendered a novel dual-channel method for real-time visual assay of NO 2 - as well as provided insightful research into functionalized Ti 3 C 2 MQDs regarding in food analysis.
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ChemSusChem
·
2021
·Vol. 15
·期 3
·e202102352
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IF 8.928
Gang Chen,Mingmei Ding,Kai Zhang,Zhen Shen,Yueting Wang,Jun Ma,Ao Wang,Yiping Li,Hang Xu
Graphical This is the way : Single-atomic Ru anchored on Ti 3 C 2 O substrate exhibits superior activity and selectivity toward electrocatalytic nitrogen reduction reaction (NRR) with an ammonia yield rate of 27.56 μg h −1 mg −1 and a faradaic efficiency of 23.3 %. Density functional theory calculations combined with physical characterization reveal that single Ru sites binding to four oxygen atoms are the main reaction centers that achieve a novel distal/alternating hybrid path, significantly promoting the NRR dynamics. Downsizing the catalyst to atom scale offers an effective way to maximize the atom utilization efficiency for electrocatalytic nitrogen reduction reaction (NRR). Herein, single-atomic ruthenium (Ru) anchored on a chemically activated Ti 3 C 2 with O-terminated groups (Ti 3 C 2 O) was designed to catalyze the NRR process. The catalyst achieved a superior activity and selectivity with ammonia yield rate of 27.56 μg h −1 mg −1 and faradaic efficiency of 23.3 % at a low potential of −0.20 V versus the reversible hydrogen electrode. According to the atomic resolution images from aberration-corrected scanning transmission electron microscopy, Ru sites on Ti 3 C 2 O achieved good dispersion on atomic scale. X-ray photoelectron spectroscopy analysis further demonstrated that the O-termination groups were successfully activated. Density functional theory calculations combined with experiments revealed that single Ru sites binding to four oxygen were the main reaction centers that permitted the hydrogenation of *NNH 2 to *NHNH 2 in a novel distal/alternating hybrid path while reducing the energy barrier of the potential-limiting step to 0.78 eV from 0.96 eV in the distal path alone or 1.18 eV in the alternating path alone, thereby significantly promoting the NRR dynamics.
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Nano Energy
·
2018
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IF 13.12
Jimei Huang,Ruijin Meng,Lianhai Zu,Zhijun Wang,Nan Feng,Ziyi Yang,Yan Yu,Jinhu Yang
Ti 3 C 2 MXene-based composites are emerging two-dimensional (2D) layered materials promising in electrochemical energy storage devices such as rechargeable ion batteries and supercapacitors . However, scalable preparation of Ti 3 C 2 MXene-based composites , especially, integrated with one-dimensional (1D) materials through a facile low-temperature strategy remains a considerable challenge. Herein, novel sandwich-like Na 0.23 TiO 2 /Ti 3 C 2 composites made of 1D amorphous Na 0.23 TiO 2 nanobelts growing on 2D Ti 3 C 2 nanosheets have been prepared through a one-step scalable transformation reaction of Ti 3 C 2 MXene . The sandwich-like Na 0.23 TiO 2 /Ti 3 C 2 composites comprising of 1D ultrathin nanobelts, 2D conductive nanosheets and 3D sandwich-like architecture with electrically connecting interfaces inside can effectively relieve strain of the electrode upon cycling, facilitate carrier transport dynamics and protect aggregation of the electrode material, favorable for high-performance rechargeable batteries. As a result, when employed as anodes in Li/Na-ion batteries, the Na 0.23 TiO 2 /Ti 3 C 2 electrodes exhibit superior long cycling stability (up to 4000 cycles at the high rates with respective capacity retention of over or nearly 100%), and remarkable rate capability. This work may open a new way for scalable synthesis of 2D layered MXene-based composites with desired architectures and properties for practical energy applications .
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Ning Qi,Lirong Mo,Yacen Tang,Youzhou He,Yuqing Wang,Xintong Shi,Yuyu Fang,Xingyan Liu,Siping Wei
Photocatalytic technology is widely used to solve environmental pollution problems, while most photocatalysts have a weak response to visible light, photogenerated charges are easy to recombine, and catalytic activity is limited. Herein, we used electrostatic self-assembly to tightly load Ti 3 C 2 MXene quantum dots (MQDs) onto Bi 2 WO 6 with oxygen vacancies (BWO) to obtain BWO@MQDs composite photocatalytic materials for the degradation of tetracycline (TC). The presence of oxygen vacancies in BWO provided more active sites, facilitating the reduction of O 2 to ·O 2 - by electrons. Moreover, MQDs and BWO could form a Schottky junction at the contact interface, and then the electrons on the BWO conduction band were transferred to MQDs, reducing the photogenerated electron-hole recombination. Under the optimal experimental conditions, the TC degradation efficiency of the BWO@MQDs photocatalyst was 88.12 %, which was 1.61 times that of original Bi 2 WO 6 , and the catalytic activity was well preserved after cycle stability testing. The possible photocatalytic mechanism and photodegradation pathway were revealed by UV–vis, XPS, ESR and LC-MS, the results indicated that ·O 2 - played the most dominant role in TC degradation and the final degradation products were mainly CO 2 and H 2 O. This study has important implications in oxygen vacancies and quantum dots co-modified bismuth-based materials for photocatalysis to solve water pollution problems.
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