MICROCHEMICAL JOURNAL
·
2025
·
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.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiangyang Yao,Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, a composite material GQDs/Gd 2 O 3 :Er 3+ /TiO 2 , was prepared by polyol method and hydrothermal method to improve the catalytic performance of TiO 2 . The composite material is analyzed by XRD, SEM, TEM, XPS, RAMAN, UV–Vis and PEC electrochemical test, combined the DFT theoretical calculation simulation. SEM and TEM results show that spherical GQDs/Gd 2 O 3 :Er 3+ nanoparticles are covered on the surface of TiO 2 nanorods. UV–Vis absorption spectra indicates that GQDs/Gd 2 O 3 :Er 3+ broadens the wavelength range of TiO 2 in the wavelength range of 400–1000 nm. The photocurrent density and the applied bias light-electroconversion efficiency of the electrodes of GQDs/Gd 2 O 3 :Er 3+ /TiO 2 is 3.47 times and 7.6 times as that of pure TiO 2 , respectively. DFT calculations reveal that the band width of GQDs/Gd 2 O 3 :Er 3+ /TiO 2 is decreased by 2.647 eV compared to pure TiO 2 , resulting in an easier transition of electrons from valence band (VB) to conduction band (CB). Photocatalytic tests show that the degradating efficiency of methylene blue (MB) by GQDs can reach 68.52 %, which is higher than that of pure TiO 2 (61.68 %).
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ACS Catalysis
·
2025
·
IF 13.1
Jianhui Liu,Ruizhe Li,Yuan Li,Lina Guo,Zhengyang Xue,Hong Yuan,Shuxin Ouyang
The crystal phase of titanium dioxide (TiO2) has a significant influence on the physicochemical properties and catalytic activities of supported metal catalysts. Herein, we synthesized two catalysts consisting of metallic nickel dispersed on anatase- and rutile-phase TiO2 (a-TiO2 and r-TiO2) supports with a simple impregnation-reduction method and assessed their photothermocatalytic activity for CO hydrogenation. The Ni-loaded r-TiO2 (Ni-r-TiO2) catalyst achieved a CO conversion of 23.3% at a photothermal temperature of 180 °C, which was 5.7 times that of the Ni-loaded a-TiO2 (Ni-a-TiO2) catalyst; meanwhile, the Ni-r-TiO2 catalyst achieved an increased C2+ hydrocarbon selectivity of 73.0% compared with that of the Ni-a-TiO2 catalyst (50.1%). CO-temperature-programmed desorption (CO-TPD), CO pulse experiments, and apparent activation energies of CO revealed the improved CO adsorption and activation abilities of the Ni-r-TiO2 catalyst. In situ diffuse reflectance infrared Fourier transform spectra (in situ DRIFTS) disclosed that the Ni-r-TiO2 catalyst followed direct CO dissociation, which led to the formation of more CH2* intermediates, subsequently yielding C2+ hydrocarbons. This work provides insights into the support design for the preferential formation of value-added chemicals.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 17
·期 1
·563-574
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IF 4.198
Enyan Guo,Longwei Yin
We report on high-performance dye-sensitized solar cells (DSSCs) based on nitrogen doped anatase TiO2–CuxO core–shell mesoporous hybrids synthesized through a facile and controlled combined sol–gel and hydrothermal process in the presence of hexadecylamine as the structure-directing agent. The matching of band edges between CuxO and TiO2 to form a semiconductor heterojunction plays an important role in effective separation of light induced electrons and holes, providing a promising photoanode for DSSCs because of its wide absorption spectrum, high electron injection efficiency, and fast electron transference. DSSCs based on the mesoporous TiO2–CuxO core–shell hybrids show a high short-circuit current density of 9.60 mA cm−2 and a conversion efficiency of 3.86% under one sun illumination. While DSSCs based on the N-doped mesoporous TiO2–CuxO hybrids exhibit the higher short-circuit current density of 13.24 mA cm−2 and a conversion efficiency of 4.57% under one sun illumination. In comparison with un-doped TiO2–CuxO hybrids, the doping of nitrogen into the lattice of TiO2 can extend the light absorption in the ultraviolet range to the visible light region and effectively decrease the recombination rate of photo-generated electrons and holes. The presented N-doped mesoporous TiO2–CuxO hybrids as photoanodes could find potential applications for high performance DSSCs.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Peng Shi,Hongju Chen,Shenwen Fang,Rui Liu,Ming Duan
Hydraulic oil is essential for machine operation, but water contamination can impair its functionality and lead to mechanical damage. Traditional dehydration methods, such as evaporation, are energy-intensive and may degrade the oil's quality. While filtration has been used to reduce water content in light oils, its application to highly viscous hydraulic oil remains unexplored. This study introduces a novel filter fabricated using ZnO, TiO₂, and stearic acid (STA)-modified mesh via a hydrothermal approach. The filter demonstrated the ability to reduce the water content in 46# hydraulic oil from 25,000 mg/L to below 162 mg/L, irrespective of the presence of surfactants. Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and performance evaluations suggest that esterification between stearic acid and oxygen groups on the TiO₂ surface is the key mechanism driving the filter's dehydration efficiency. This work represents a significant advancement in the deep dehydration of viscous oils through filtration, offering a low-energy and effective solution for enhancing hydraulic oil performance.
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高影响因子
ACS Omega
·
2025
·
IF 4.3
Weiwei Kong,Shule Zhang,Qin Zhong
Developing facile TiO2 preparation methods is crucial for advancing the industrial implementation of a catalytic peroxone process for NO oxidation. In this study, three types of precursors, including titanium butoxide (Ti-BO), metatitanic acid (Ti-MTA), and titanyl sulfate (Ti-TOS), were used to synthesize TiO2. Remarkably, Ti-TOS and Ti-MTA exhibited enhanced activity compared to that of Ti-BO, with 93 and 87% NO oxidation efficiency (373 K, O3/NO = 0.4, H2O2/NO = 1.2, GHSV = 1.2 × 105 h–1), which is higher than that of Ti-BO (78%). Further investigations revealed that residual sulfate groups (SO42–) from precursors enhance Lewis acidity by withdrawing electrons from the Ti4+ sites, thereby facilitating H2O2 deprotonation and Ti-OOH formation. This accelerates radical generation for NO oxidation while inhibiting nitrate accumulation and weakening NO adsorption to optimize reaction kinetics. In addition, sulfates also inhibit the accumulation of oxidation product nitrates on the catalyst surface, thereby improving catalytic stability. This work reveals the promotion mechanism of SO42– on the catalytic peroxone process from multiple perspectives.
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PubMed
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RENEWABLE ENERGY
·
2025
·
IF 9.1
Pengpeng Huang,Zishuo Du,Zhihao Lv,Shuntao Liu,Xiyu Liu,Mingming Fan,Pingbo Zhang,Tengfei Niu,Yan Leng
The catalytic activity of metal nanoparticles is strongly correlated with reducible support, but scant knowledge exists on the effect of the crystal phase of the reducible support on the catalytic activity. Herein, we investigated the conversion of methyl laurate over NiRe/TiO 2 catalysts by modulating hydrochloric acid concentration to control crystal phase structures. The optimal NiRe/Mix-TiO 2 exhibited excellent catalytic performance with 100% yield of alkanes (240 °C, 3.5 MPa, 5 h) and 76.06% yield of fatty alcohol (180 °C, 2.5 MPa, 18 h). The effect of different crystal phases on the catalytic performance was unveiled via experiments, characterization and calculations. The results indicated that NiRe/A-TiO 2 with more alloyed NiRe nanoparticles contributed to hydrogen activation and dissociation, and enhanced hydrogen spillover (62 μmol/g). The NiRe/R-TiO 2 with oxygen-rich vacancies (19.6% O V ) contributed to the adsorption of methyl laurate. The synergistically enhanced NiRe/Mix-TiO 2 exhibited the most excellent catalytic performance, which was attributed to the highest oxygen vacancy concentration (39.1% O V ) and moderate hydrogen spillover (42 μmol/g). This work provided a feasible method to improve the alkanes and alcohol yield for mild-condition hydro-conversion of methyl laurate by crystal phase regulation engineering.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dan Zhong,Zhiyong Liu,Qifang Ruan,Kun Guo,Bing Xie,Pu Mao,Haijun Sun
High dielectric loss and temperature-dependent dielectric constant are the main obstacles limiting the application of giant dielectric materials in microelectronic devices. Here, (Nb 0.5 Bi 0.5 ) x Ti 1- x O 2 (NBTO- x ) ceramics modified by defect cluster synergistic interfacial effects were designed to improve the dielectric properties, and the mechanism of the giant dielectric behavior was thoroughly investigated. The defect clusters formed by co-doping of Bi 3+ and Nb 5+ ions confined the free electrons to a limited range of jumps, leading to a significant increase in the dielectric constant and a decrease in the dielectric loss of the NBTO- x ceramics. Defect clusters aggregated near grain boundaries accumulated free electrons and carriers, which formed an interfacial effect with insulating grain boundaries, further reducing the dielectric loss. Thus, a high dielectric constant of 10 5 and a low loss of 0.04 at 1 kHz with a temperature stability of Δ ε′ / ε′ 25 °C ≤ ±15% (-55 °C to 105 °C) was obtained in the NBTO-0.5% ceramic. This study offers a new approach to the design of high-performing giant dielectrics with excellent potential for application in microelectronic devices.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Fengyan Xie,Chunlei Huang,Guofa Dong,Minghui Wu,Kechen Wu,Shaowu Du,Yafeng Li,Mingdeng Wei
Perovskite solar cells (PSCs) fabricated of TiO 2 electron transporting material (ETM) have aroused tremendous attention, but their power conversion efficiency (PCE) needs further improvements. In this study, for the first time, zirconium (Zr)-doped brookite TiO 2 nanorods (ZTO) are synthesized by a facile route and subsequently employed as an ETM in PSCs which finally achieves a considerable PCE of 19.42 % by optimizing all operating conditions. Further characterizations have been undertaken to explore in detail the effects of Zr doping on the nature of the perovskite active layer and the photovoltaic performance. As a consequence, the enhanced PCE can be ascribed to the high quality perovskite crystals and a more favorable energy level alignment between the perovskite layer and ZTO mesoporous layer.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenqing Qin,Jiewei Xu,Xuyi Wei,Junwei Han
The closed pores and slow kinetics of conventional Ti-based adsorbents (HTO) hinder their industrial application in the selective adsorption of Li + from wastewater. Herein, a surface modification and spatial optimization strategy was developed to improve the adsorption performance of HTO for Li + . The strong hydrophilicity caused by high roughness of modified HTO increases the contact area between the Li + -containing solution and the absorbent, which shortens the diffusion path of Li + to the adsorbent surface and accelerates the migration of Li + to the adsorbent surface. The excellent lithium affinity of N heteroatom on the surface of modified HTO promotes the conversion of hydrated Li + into activated Li + , which can be easily captured by the adsorbent. The large specific surface area of modified HTO provides abundant absorption sites of Li + . The material with rich pores provides sufficient space to improve the adsorption capacity of Li + . The small particle size shortens the transport path of Li + from the adsorbent surface to its interior, thereby reducing the transport resistance, which accelerates the migration of Li + into the adsorbent and releases a large number of active sites on the surface. The experimental results show that the Li + adsorption rate is increased from 0.37 mg·g −1 ·min −1 to 0.82 mg·g −1 ·min −1 after modification. The adsorption capacity of the adsorbent is 49.05 mg·g −1 and it remains 96.7 % after 5 cycles, indicating excellent adsorption performance and recyclability. This study provides a strategy for effective extraction of Li + from low concentration solutions.
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LANGMUIR
·
2025
·
IF 3.9
Zewei Huang,Yingjie Wang,Meiying Ye,Heyong Cheng
Two TiO2 inverse opal films (F-TiO2-IOF and CO-TiO2-IOF) were synthesized on glass substrates by a limited planar rapid evaporation method, which was time- and reagent-saving, and it was easy to control their shape. The CO-TiO2-IOF displayed a smoother mophology and better photocatalytic efficiency and stability than F-TiO2-IOF. Over 95% of 5 mg L–1 rhodamine B (RhB) was degraded within 120 s in the IOF-modified microreactors. A higher photocatalytic efficiency could be achieved with the synergistic catalysis of H2O2 and CO-TiO2-IOF, based on which the online monitoring of RhB was realized within 2 min in the IOF-modified photocatalytic microreactor integrated with the flow cell of a UV–vis spectrophotometer. Other nitrogen-containing dyes like tartrazine and indigo carmine were also degraded in CO-TiO2-IOF-modified microreactors with degradation rates of 83–95%.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Aerzigu Xukeer,Jin Li
In this work, we synthesized the ternary nanocomposite of ZnO/TiO 2 /rGO and used as formaldehyde gas detection at room temperature (RT). The integration of rGO with the ZnO/TiO 2 heterostructure enhanced the composite’s responsiveness at RT. The presence of rGO enhanced conductivity, mechanical stability, and charge transfer, in addition to providing more active sites for CH 2 O molecule adsorption. Sensors based on ZnO/TiO 2 /rGO exhibited a response of 86 to 50 ppm formaldehyde, with response and recovery times significantly shortened to 11 s and 3 s, respectively. Additionally, the selectivity, stability, and repeatability of the sensors were also evaluated. Our method of sequentially combining ZnO with TiO 2 , followed by incorporating rGO to form a ternary heterostructure, effectively optimizes ZnO. This two-step approach addresses the limitations of slow desorption efficiency and low response associated with ZnO. We conducted first-principles computation to understand the sensing performance.
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