Desalination and Water Treatment
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2024
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IF 1
Runlin Han,Yongli Xie
In this work, TiO 2 /MXene nanocomposites have been explored with hydrothermal synthesis during the dye photocatalytic degradation process. They worked as photocatalyst with high efficiency. The degradation of organic dye methyl orange with MXene under ultraviolet (UV) light and visible light was studied in detail. The methyl orange can be degraded efficiently especially at acid condition. When the nanocomposites/dye ratio was fixed at 5, most of the dye (close to 99.9%) was degraded under UV and visible light irradiation in 3 h. When MXene was recycled to treat methyl orange, the degradation rate was kept at 96% after 2 cycles under UV light. It was found that the composite material showed improved photocatalytic performance under long time ultraviolet treatment. Scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy characterizations of Ti 3 AlC 2 and MXene were carried to investigate the possible reasons for high degradation efficiency. MXene worked as a cocatalyst which enhanced the separation of electron hole pairs and catalytic performance.
研究领域:
材料科学
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光催化
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环境工程
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Yaxin Zhang,Zhuang Chen,Yimei Zhang,Wenwen Gu,Wendy Huang,Jiangshan Xi,Ting Cao,Yingjie Yu,Mingwang Yang,Luoyilang Ke
In this system, a highly-exposed TiO 2 photoanode was prepared as an effectively photoelectrocatalyst peroxymonosulfate (PMS) activator. Especially, we realize the highly-exposed TiO 2 grown on negatively charged MXene nanosheet which could provide dual active sites for stimulating PMS. The catalysts were characterized by XRD, XPS, SEM, UV–vis, Raman, TEM, and BET. The specific surface area for highly-exposed TiO 2 (S-400) is 10 times than Bulk catalyst (B-400), which is displayed in the BET result. The experimental results show that high exposure catalyst has excellent photoelectric activation performance. The degradation efficiency of the PEC + PMS system was 2.94 times higher than the EC + PMS and 2.76 times higher than the PC + PMS process. Compare with free PMS (1.36˚A), PMS adsorbed at the photoanode interface has a high bond angle (2.85˚A) easily to decompose into strong oxidizing SO 4 − . The electrochemical characterization results demonstrated that the highly-exposed TiO 2 had a higher separation rate of photogenerated carriers. From quenching experiments, the holes (h + ) contributed 80 % to BPA degradation in PEC + PMS system, the contribution order of other active radicals was O 2 − >SO 4 − > OH. It will help improving the control of the optimal free radical ratio. The probable mechanism and pathway of BPA degradation were suggested e − reacts with PMS and other substances to generate radicals. The research offers a new strategy for the effective activation about PMS to oxidation of the refractory organics. Besides, the results provide useful theoretical guidance for the development of new high-activity materials.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
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IF 6.6
Junqi Liu,Meng Wang,Saijin Wang,Yanli Zhao,Shi Zhou,Jinlian Li,Dongmei Wu
Oxygenated polycyclic aromatic hydrocarbons (OPAHs) present in the environment can enter the skin through direct contact and long-term exposure can increase the risk of skin inflammation, allergic reactions and skin cancer. In this study, a titanium dioxide-two-dimensional transition metal carbide/multi-walled carbon nanotubes/polydopamine/glassy carbon electrode (TiO 2 -MXene/MWCNTs/PDA/GCE) electrochemical biosensor was prepared to evaluate the cytotoxicity of OPAHs based on the changes in the content of xanthine/guanine (X/G) during cellular metabolism. The TiO 2 -MXene/MWCNTs/PDA/GCE exhibited excellent electrocatalytic activity and sensitivity. The surface morphology, structure and electrochemical properties of TiO 2 -MXene/MWCNTs/PDA composite material were characterized using scanning electron microscopy, X-ray diffraction and cyclic voltammetry. Human skin fibroblast cells (HFF-1) were used as model cells, and the cell viability was evaluated based on the electrochemical signal changes of X/G. When exposed to OPAHs for 30 h, the half-maximal inhibitory concentrations (IC 50 ) of 1,4-benzoquinone (1,4-BQ), 1,2-naphthoquinone (1,2-NQ), and 9,10-phenanthrenequinone (9,10-PQ) on HFF-1 cells were 291.88, 67.72, and 4.44 µmol·L −1 , respectively, which were lower than the IC 50 values of 1075.51, 113.96, and 9.63 µmol·L −1 obtained using the traditional MTT assay, indicating higher sensitivity of the sensor. This study achieved sensitive detection of purines in HFF-1 cells, providing a technical method for evaluating the cytotoxicity of persistent organic pollutants OPAHs in the environment.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Zhipeng Ren,Qian Zhu,Lei Cao,Lanlan Fan,Liang Xu,Shixian Xiong
Dopamine (DA) serves as a vital neurotransmitter involved in reward mechanisms, motor coordination, and cognitive processes, establishing the importance of its reliable detection for diagnosing associated neurological disorders. This study presents a microwave-assisted synthesis strategy for rapid fabrication of TiO 2 /MXene/rGO heterojunction nanomaterials, engineered for ultrasensitive electrochemical DA detection. The ternary composite demonstrated significantly enhanced electrocatalytic performance, attributable to the synergistic combination of abundant oxygen vacancies, exceptional electrical conductivity, and ultrahigh specific surface area. These characteristics collectively provide substantial active sites and enable efficient electron transfer during DA oxidation. As a result, the obtained TiO 2 /MXene/rGO electrode exhibits remarkable analytical performance with dual linear response ranges of 0.01–2.4 μM and 2.4–50 μM, a high sensitivity of 21.893 μA μM −1 , and an ultralow detection limit of 5.1 nM. The sensor also demonstrates excellent reproducibility, repeatability, and outstanding selectivity against interfering substances. Moreover, the sensor was applied to determine DA in real samples with satisfactory results.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Haiguang Gao,Rui Shi,Yuting Shao,Yana Liu,Yunfeng Zhu,Jiguang Zhang,Xiaohui Hu,Liquan Li,Zhixin Ba
Self-assembly of TiO 2 nanoparticles (M-TiO 2 , 15–20 nm in size) on few layer Ti 3 C 2 T x (FL-Ti 3 C 2 T x ) are conducted via simple one-step ultrasound method at room temperature, in which van der Waals interactions act as the driving force. After introduced into MgH 2 system, M-TiO 2 /FL-Ti 3 C 2 T x heterostructure with mass ratio of 60: 40 (6 M-TiO 2 /FL-Ti 3 C 2 T x ) shows the best catalytic activity. The one-step self-assembly preparation can alleviate the restacking of FL-Ti 3 C 2 T x and the agglomeration of M-TiO 2 nanoparticles to a certain extent, which can generate lots of interfaces between M-TiO 2 and FL-Ti 3 C 2 T x . The rich interfaces can not only act as hydrogen diffusion channels, but also the electron transfer on the interfaces can enhance the catalytic activity of the whole heterostructure. Besides, abundant electrons from multiple valence Ti (Ti 4+ , Ti 3+ , Ti 2+ , Ti 0 ) can effectively promote the reversible reaction between MgH 2 and Mg, H 2 . The facile preparation method facilitates the understanding of MXene heterostructure catalysts, without the influence of particle growth and impurities. These findings provide new insights to design heterostructure with high catalytic activity and guide the understanding of its catalytic mechanism.
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Richao Niu,Rubing Han,Shaochun Tang,Junwu Zhu
Graphene and MXenes, both as an emerging two-dimensional (2D) material, have become the predominant choice of electrochemical energy electrode materials owing to large surface-area-to-volume ratio and high electrical conductivity . However, severe restacking of such 2D ultrathin nanostructures largely lowers active surfaces and thus constrains their applications. Herein, we develop a microwave selective heating strategy that is highly efficient for ultrafast and scalable fabrication of novel coral-like porous MXene/graphene composite with high-quality graphene and well-dispersed TiO 2 nanocrystals . The MXene not only works as a source material but also serves as an excellent microwave absorbent, which leads to that reduction of graphene oxides can be completed within only 10 s under microwave irradiation at a much lower applied power of 200 W than the reported value of 1000 W. Especially the coral-like TiO 2 -MXene/graphene material with large porosity delivers much higher capacity (356 mAh g −1 at 50 mA g −1 ) and much better rate capability than those for pure graphene, MXene and other MXene/graphene composites. That is attributed to the composites avoids restacking, assures structural stability, and provides high specific surface area and excellent electrons/ions conductivity. This work provides a new route to large-scale and low-cost production of high-performance electrode materials for lithium-ion battery.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Chenyu Wu,Xiuzhen Wang,Ying Zhu,Lei Dong,Jingjing Xu
Titanium dioxide (TiO 2 ) shows promise as an anode material for Li/Na-ion batteries due to its low cost and good cycling stability. However, the limited rate capability and poor conductivity severely limit their practical application. Herein, the nitrogen-sulfur co-doping nano TiO 2 is in-situ constructed on the Ti 3 C 2 T x MXene substrate (SN-TiO 2 @MXene) via facile partial oxidation of MXene. The introduction of S-N heteroatoms, TiO 2 @MXene heterostructures and nanostructures can enhance electronic conductivity, improve ions diffusion kinetics and promote the contribution of pseudo-capacitance. Moreover, the employment of three-dimensional conductive layered MXene parent phase as a substrate material can not only construct the conductive network but also enhance the structural stability of the electrode. The SN-TiO 2 @MXene composite achieves an impressive reversible capacity of 306 mA/g after 1500 cycles at 500 mA/g, and 241.1 mAh/g after 2000 cycles even at a high current density of 2000 mA/g in LIBs. Furthermore, this electrode exhibits a discharge capacity of 105 mAh/g after 1000 cycles at 500 mA/g in SIBs. This study demonstrates that the three-dimensional layered SN-TiO 2 @MXene composites hold promising prospects as anode materials for ion batteries, and offer valuable insights for the fabrication of titanium matrix composites with exceptional electrochemical properties.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Mingmei Ding,Wang Ao,Hang Xu,Wei Chen,Lin Tao,Zhen Shen,Huihong Liu,Chunhui Lu,Zongli Xie
Photocatalysis and peroxymonosulfate (PMS) based advanced oxidation processes (AOP) are emerging technology for the degradation of refractory organic pollutant in the field of water treatment . Here we report a novel CoO@TiO 2 /MXene (CTM) hybrid through a facile sonication-hydrothermal method for efficient degradation of phenol via an integrated PMS activation-photocatalysis process. Benefiting from the proper position and superior suitability of the band structure, a dual interfacial charge transport channel was constructed, boosting the separation of photo-generated charge carriers and generating sufficient potential difference for redox reaction. Accordingly, the CTM hybrid not only possessed the outstanding photocatalytic activity but also dramatically accelerated PMS activation to generate considerable reactive radicals. As a result, over 96% phenol degradation was achieved in the 10% CTM/PMS/Vis system within 15 min. The radical quenching test and EPR analysis reveal that SO 4 •− , O 2 •− and 1 O 2 were predominant reactive species involved in the catalytic process. Moreover, the damaged chemical structure of CoO during PMS activation could be healed by the photo-actuated Co(II) regeneration to allow for continuous and stable catalytic process. This study offers a promising perspective for the rational design of competent and stable hybrid heterojunction catalyst to construct PMS activation-photocatalysis processes for the efficient degradation of organic contaminants .
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）