QUIMICA NOVA
·
2024
·
IF 0.5
Yu Yang,Shen Guoliang,Xu Tie jun,Wen Ruiyang,Wang Yong jie,Huo Yue,Xu Shi jie
Silicon catalysts have very low catalytic activity in polyester (PET). However, titanium catalysts have high catalytic activity in polyester. The simultaneous use of titanium and silicon catalysts is effective in reducing the activity of a single titanium catalytic base agent. In addition, the glycol salts of titanium and silicon (Ti-EG and Si-EG) prepared in the present invention for use in the polyester catalytic process can avoid the introduction of other groups of impurities during the polyester catalytic process, which would lead to premature capping of the polyester in the process of polycondensation and chain building and make it difficult to increase the molecular weight, and thus affect the quality of the polyester. It has been verified that the ratio of Ti:Si is 1:1 (mol), and total amount added to the catalyst is 0.15% of the raw material amount, and the polycondensation temperature was 260-280 °C for 60 min. Compared with the single Ti-EG catalyst, the b* value of the synthesized PET was significantly reduced, and the molecular weight and other indexes did not change too much. In addition, at the end of catalysis, the catalyst was uniformly dispersed in the reaction system, which could be used as a matting agent for PET.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Li Danni,Guo Xin,Shao Xiang,Zhou Anhui,Zhu Lin,Zhang Yuting,Li Binbin,Du Yan,Cao Limei,Yang Ji
The electrochemical advanced oxidation process (EAOP) has shown significant promise in the field of refractory organic wastewater treatment due to its high efficiency and environmentally friendly nature. In this study, Ti/Sb-SnO 2 electrodes with varying proportions of Hf were prepared using the sol–gel method. The addition of Hf transformed the original collapsing and broken surface into a flat and regular surface. The results demonstrated that Ti/Sb-SnO 2 -Hf electrode doped with 6% Hf exhibited a higher oxygen evolution potential (OEP) and excellent stability. The OEP increased from 2.315 V without Hf-doping to 2.482 V, and the corresponding actual life was 321.05% higher than that without Hf. The current density (5–40 mA·cm −2 ), electrolyte concentration (0.02–0.2 mol·L −1 ), pH (3–11), and initial pollutant concentration (5–80 mg·L −1 ) were evaluated to confirm the tetracycline (TC) degradation characterization of Ti/Sb-SnO 2 -6%Hf electrodes. It was concluded that under the optimal degradation conditions, the removal rate of TC could reach 99.66% within 2 h. The degradation of TC follows first-order reaction kinetics. The oxidative degradation of TC was achieved through indirect oxidation, with ·OH playing a dominant role. TC’s electrochemical oxidation degradation pathway has been proposed: Based on LC–MS results, three main pathways are speculated. During the electrocatalytic oxidation process, decarboxylation, deamidation, and ring-opening reactions occur under ·OH attack, producing intermediate compounds with m/z values of 427, 433, 350, 246, 461, 424, 330, 352, 309, 263, and 233. These intermediates are further oxidized to intermediate compounds with an m/z value of 218. This work introduces a new efficient anode electrochemical catalyst for the degradation of TC, providing a strategy for industrial applications.
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DOI
PubMed
AICHE JOURNAL
·
2024
·
IF 3.5
Nan Wang,Yi Li,Xiujie Cheng,Ruiqi Zhang,Qing Zhou,Jiayu Xin,Dongxia Yan,Junli Xu,Xingmei Lu
This study employed titanium catalysts to degrade low-quality PET (polyethylene terephthalate) bottle flakes and subsequently re-polymerized the degradation solution to investigate whether the titanium catalyst could restore the physical and chemical properties of the degraded PET bottle flakes. The reaction process of property restoration was characterized using GPC, DSC, ICP, NMR, and so forth. The mechanism of titanium catalyst-catalyzed PET polymerization was explored through simulation calculations. The results indicate that the waste PET bottle flakes have been restored to the standard of first-grade PET bottle flakes under the degradation and re-polymerization processes with the aid of dibutyl ethylene glycol titanate catalysts. The Ti ion in the recycled PET is stable and the metal ion leached from the restored PET in the strong acid environment meets food-grade safety requirements. This study is expected to provide a new way for recycling waste PET bottle flakes.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Qian Wang,Tingting Wang,Yongwei Huang,Liang Cheng,Ting Yang,Yali Ma
The modulation of the crystal phase structure can change the band gap and chemisorbed oxygen content of the metal oxide semiconductors (MOSs) materials, thereby optimizing the gas sensing properties of the material. Herein, the effect of TiO 2 with different crystal phase structures derived from MIL-125 (Ti) calcined at different temperatures on the gas-sensitive properties of acetone is investigated. The study indicates that despite anatase TiO 2 -400 (derived from MIL-125 (Ti) under calcination at 400℃) having a large specific surface area and abundant oxygen vacancies, rutile TiO 2 -700 (derived from MIL-125 (Ti) under calcination at 700℃) exhibits superior gas sensitive performance with the high sensitivity, good selectivity, fast response times, and an ultra-low detection limit (200 ppb) for acetone (biomarker of diabetes). In-depth discussion shows that the excellent sensing performance can be attributed to the regulation of the crystal phase structure of TiO 2 that is favorable for narrowing of band gap, the increase of chemisorbed oxygen content and adsorption energy of acetone molecules. In addition, TiO 2 -700 has excellent properties for diabetes detection in simulation. Our findings help to understand the effect of the crystal phase structure of the material on gas sensitive performance, paving the way for designing excellent TiO 2 -based gas sensors.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·
IF 3
Feng Tianxu,Shan Wei,Zhang Yongzhou,Huang Haibo,Tang Hua
Solar photocatalytic degradation and adsorption using metalorganic frameworks (MOFs) offer safe and energy-efficient remediation for water contaminated with small organic pollutants, leveraging their semiconductor-like tunable band structures and inherent porosity. This study reports the de novo synthesis of a visible-light-responsive Ti@Ce MOF heterojunction composite for synergistic photocatalytic degradation and adsorption of recalcitrant organic contaminants. An in-situ growth strategy deposited NO.-functionalized UiO-66(Ce) onto NH 2 -modified MIL-125, forming an S-scheme heterojunction engineered for efficient visible-light-driven hydrogen peroxide (H 2 O 2 ) generation. This in-situ photogenerated H 2 O 2 acts as a potent oxidant, effectively degrading tetracycline. A significantly enhanced photocatalytic degradation rate constant ( k ) for tetracycline was observed, indicating boosted catalytic activity. Mechanistic analysis underscores the critical role of the S-scheme heterojunction in promoting charge carrier separation and enhancing H 2 O 2 production, thereby efficiently driving organic pollutant oxidative degradation. This work provides a novel strategic framework for designing multifunctional MOF composites, advancing high-performance, sustainable water purification technologies.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kui Tang,Xiaoyuan Chen,Zhenhua Tang,Zhao Qin,Kangzhen Xu,Ruiqi Shen,Tuan Zhao,Suhang Chen
The microwave ignition holds potential in the ignition of weapons due to its simple structure, non-contact property, and simultaneous ignitions of large area. However, the long ignition delay time of the current ignition agents cannot meet the microwave weaponry advancements. To address the issues, a microwave sensitive oxide-CuFe 2 O 4 (CUFO) which was firstly discovered to be easily ignited by microwaves compared many ferrites, was coupled with Ti nanoparticles (n-Ti) to form Ti/CUFO microwave ignition agents by electrostatic spray granulation. The characterization of microwave ignition, volumetric combustion, burning rate and DSC were used to determine its ignition delay time and the energy release properties. It indicates that the microwave sensitivity, maximum peak pressure and pressure pressurization rate of Ti/CUFO first increases and then decreases with the promoting content of n-Ti. The Ti/CUFO at Φ = 3.5 exhibits the lowest ignition delay time by 79.24 ms compared to the 98.7 ms of n-Ti, meanwhile, its maximum peak pressure and pressurization rate reach the highest by 338.54 kPa and 8.57 kPa/ms, respectively. The DSC results indicate that Ti/CUFO exhibits much lower reaction peak temperature by 320–335 °C compared to 488 °C of n-Ti, which suggests Ti-CUFO reaction maybe much easier be activated. The dielectric loss of n-Ti and CUFO under strong electric field transfer the energy of microwaves to heat, reaching to its reaction temperature. The XPS and XRD results of CUFO after microwave radiation disclosing the crystal transition, formation of divalent iron and oxygen vacancies , as well as the released bright light under microwave radiation , suggest the thermal breakdown mechanism of CUFO. When Ti/CUFO exposes into microwaves, CUFO generates oxygen vacancies due to heat loss and n-Ti is dielectric heated, followed by the generated oxygen reacting with n-Ti, improving the combustion performance of n-Ti. This result provides new insight for the designing of microwave ignition.
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高影响因子
ACS Omega
·
2023
·
IF 4.1
Xiaodong Hu,Jiaqi Zhong,Haiyong Ao,Xinhui Wu,Yujiong Chen,Zhaoxiang Peng
This study presents a novel approach to mitigating bacterial infections and antibiotic resistance in medical implants through the integration of iodine-doping and 3D printing techniques. Iodine, with its potent antibacterial properties, and titanium alloy (Ti), a popular metal for implants due to its mechanical and biological properties, were combined via electrodeposition on 3D-printed titanium alloy (3D-Ti) implants. Scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy confirmed the successful creation of iodine-doped titanium implants with improved iodine content due to the rough surface of the 3D-printed material. In vitro studies revealed that these implants significantly inhibited bacterial adhesion and biofilm formation and showed favorable release kinetics for iodine ions. Biocompatibility tests demonstrated no cytotoxic effects and good hemocompatibility. The implants demonstrated enhanced antimicrobial efficacy against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria strains. The findings imply that the integration of iodine-doping and 3D printing technologies is a promising strategy for treating postoperative infections associated with medical implants, consequently bettering the prognosis for patients. Future investigations are encouraged to delve into the long-standing impacts and prospective clinical utility of this groundbreaking methodology.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Zheng Wang,Li Mei,Xinqiang Liu,Qihui Zhou
Titanium (Ti) is widely applied as bone-anchoring implants in dental and orthopedic applications owing to its superior mechanical characteristics, high corrosion resistance, and excellent biocompatibility. Nevertheless, Ti-based implants with the deficiencies of insufficient osteoinduction and associated infections can result in implant failure, which significantly limits its applications in some cases. In this work, hierarchically hybrid biocoatings on Ti implants are developed by gradual incorporation of polydopamine (PDA), ZnO nanoparticles (nZnO), and chitosan (CS)/nanocrystal hydroxyapatite (nHA) via oxidative self-polymerization, nanoparticle deposition, solvent casting and evaporation methods for enhancing their antibacterial activity and osteogenesis. The modification of PDA on porous reticular Ti substrates greatly reduces the surface roughness, wettability, protein adsorption, and provides high adhesion to the deposited nZnO. Further, incorporating nZnO on PDA-coated Ti surfaces affects the surface structure and wettability, significantly inhibits the growth of both Staphylococcus aureus and Escherichia coli . Moreover, the CS/nHA-doped coating on the nZnO-modified Ti surfaces remarkably improves cytocompatibility and enhances the osteogenic differentiation of MC3T3-E1 cells by upregulating the protein expression of alkaline phosphatase. This work offers a promising alternative for developing Ti implants with long-lifetime bioactivity to achieve strong antibacterial ability and enhanced bone formation for potential dental/orthopedic applications.
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DOI
PubMed
高影响因子
ANALYST
·
2012
·Vol. 138
·期 2
·569-575
·
IF 4.23
Chunyan Chen,Shaolei Yang,Di Pan,Yiming Long,Zhihong Yan,Qingyun Cai,Shouzhuo Yao
An octadecyl-functionalized solid-phase microextraction (SPME) fiber was prepared by sol–gel technology with an anodized Ti wire as the substrate and dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (C18-TMS) and tetraethoxysilane (TEOS) as sol–gel precursors. The anodized Ti wire has high mechanical strength and has numerous titanol groups on its surface for sol–gel reactions, consequently offering better performances than the commercial fragile fused silica substrate. The C18-TMS/TEOS sol–gel coated fiber has good thermal stability and stability against organic solvents. There is no loss in the performance after 100 cycles of exposure to acetonitrile and high temperature (300 °C) in turn. The developed fiber with a very thin (ca. 2 μm) coating thickness exhibits comparable or even superior extraction capability relative to the commercial 100 μm polydimethylsiloxane (PDMS) fiber. Under optimized conditions, the detection limits for the polycyclic aromatic hydrocarbons are in the range of 0.003 to 0.025 μg L−1 with a linear range from 0.01 to 20 μg L−1. The proposed method was successfully applied in the analysis of environmental water samples with the recoveries ranging from 85.3 to 101.8%.
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高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 10
·105316
·
IF 1.449
Ruoyu Liu,Chuanbing Huang,Lingzhong Du,Hao Lan,Shige Fang,Weigang Zhang
Aluminium/polyimide (Al/PI) powders were prepared via in situ. Al/PI composites were fabricated by hot pressing technology at 723 K for 30 min under Ar. The microstructure, thermal stability and tribological properties of Al/PI composites were investigated. SEM images showed that Al particles were wrapped in the composite with no gap. According to the TG analysis, 15Al/PI composite showed excellent thermal stability up to 773 K. Meanwhile, 15Al/PI composites exhibited excellent tribological behaviour at high temperature, especially at 773 K. The friction coefficient of 15Al/PI composite at 773 K was about 0.28 which was lower than that of pure PI (about 0.41). The wear rate of 15Al/PI composite at 773 K was about 65 × 10−5 mm3 Nm−1. The tribological properties of Al/PI composites was improved at high temperature. In the process of sliding tests, Al particles were transferred to the Ti-6Al-4V alloy's surface and PI particles were pressed on the composite's surface. The transfer of Al can protect Ti-6Al-4V alloy from wear and reduce the friction coefficient during the sliding test.
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高影响因子
Advanced Energy and Sustainability Research
·
2021
·Vol. 2
·期 6
·2000095
·
IF 0
Jun Pan,Nana Wang,Dan Lv,Wujie Dong,Jian Yang,Fuqiang Huang
Sodium-ion batteries (SIBs), as next-generation energy storage devices, can be made by a similar production process to lithium-ion batteries (LIBs). The key to accelerating their commercialization is to discover appropriate high-performance electrode materials with low cost, nontoxicity, and simple synthetic features. Herein, layered-structure Na 2 Ti 3 O 7 , with the advantages of appropriate charge/discharge plateaus, superior stability, environmental friendliness, and ease of preparation using cheap raw materials, is selected for assembly in full-cell battery packs to evaluate its suitability for practical application. When evaluated in a coin cell, it has a capacity of 77.2 mAh g −1 at 1 A g −1 after 10 000 cycles with capacity retention of 99.9%, demonstrating its excellent stability. In the case of a soft-pack battery, it retains 22.3 mAh g −1 at 0.1 A g −1 and 18.1 mAh g −1 at 0.05 A g −1 after 50 cycles. After cycling, there is no sodium dendrite formation or active material shedding, further confirming its safety in practical application. Therefore, Na 2 Ti 3 O 7 as another intercalation/deintercalation mechanism material has application potential in the future.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
电池技术
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DOI
JOURNAL OF CLUSTER SCIENCE
·
2026
·Vol. 37
·期 6
·139
·
IF 4.1
Chen Hechang,Wu Fei,Zhu Yufu
Titanium microspheres served a dual role in this study. First, they acted as supporting materials for TiO 2 /BiOBr photocatalysts. Second, they provided a low-cost precursor for titanium dioxide preparation. The growth of core-shell structured Ti@TiO 2 microspheres was realized using a hydrothermal method in NaOH solution. By varying the concentration of NaOH solution, TiO 2 nanowires with different morphologies were fabricated. A comprehensive characterization of the samples using field-emission scanning electron microscopy, X-ray diffraction measurements, and energy-dispersive X-ray analysis revealed that TiO 2 nanostructures formed a well-coated layer on titanium microspheres, demonstrating an anatase crystal structure. The photocatalytic performance of the obtained core-shell structured Ti@TiO 2 microspheres was studied through the photocatalytic degradation of Rhodamine B (RhB) solution. The results demonstrated that the sample prepared in NaOH solution with the concentration of 7 M exhibited the best photocatalytic performance, achieving an RhB removal efficiency of nearly 100% within 100 min under simulated light irradiation. In order to further improve the photocatalytic performance of the prepared samples, BiOBr was loaded on the surface of TiO 2 nanowires via a solvothermal method, yielding core-shell structured Ti@TiO 2 /BiOBr heterojunction photocatalysts, consisting of a metallic Ti core and a composite TiO₂/BiOBr shell. The catalysts demonstrated a significant enhancement in photocatalytic performance compared with core-shell structured Ti@TiO 2 microspheres, achieving nearly complete degradation of RhB solutions within 30 min. Furthermore, the photocatalyst maintained 91.92% of its activity after three consecutive cycles.
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高影响因子
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