CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 8
·10845-10851
·
IF 3.45
Yuhan Yao,Ju Rong,Jing Feng,Yannan Zhang,Xiao Wang,Xiaohua Yu,Zhaolin Zhan
The modification of TiO 2 is a vigorous and challenging research field. In the present study, TiO 2 /CuO composite nanofibers , designed by considering the thermodynamics of nanocrystals , have been synthesized by an electrospinning and hydrothermal method . The results showed that the grain growth of uniform and highly active CuO was driven by the surface drag force of TiO 2 nanofibers. TiO 2 /CuO showed an alternating current impedance as low as 2.874 Ω, and the Li + diffusion rate was increased tenfold compared to that of bare TiO 2 nanofibers. Equally importantly, the electron diffusion kinetics was also explored, which revealed that the band gap was reduced by 1.14 eV compared to that for bare TiO 2 nanofibers. In addition, TiO 2 /CuO exhibited satisfactory stability and electrochemical performance. Its initial discharge capacity was 540 mAh·g −1 , and that after discharge over 400 cycles at 0.1 C was 174 mAh·g −1 . The design method may be more broadly applied to various nanostructured TiO 2 materials.
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高影响因子
Materials
·
2019
·Vol. 12
·期 6
·896
·
IF 2.972
Zhu Zhu,Ye Zhang,Yibo Zhang,Yanli Shang,Xueji Zhang,Yongqiang Wen
Ethylene causes faster deterioration of perishable crops during postharvest transportation and storage. The present study aimed to develop TiO2-coated nanofibers with efficient photocatalytic activities to enhance the degradation of fruit-emitted ethylene. The consecutive electrospinning of polyacrylonitrile (PAN) and TiO2deposition was successfully performed to produce PAN@TiO2nanofibers. The scanning electron microscopy results indicate the uniform distribution of TiO2nanoparticles on the surface of the PAN nanofiber. The PAN@TiO2composite nanofibers exhibited enhanced photocatalytic activity for ethylene degradation under low-intensity UV light irradiation. Furthermore, a tomato fruit-ripening test confirmed the effectiveness of the PAN@TiO2nanofibers. The PAN@TiO2nanofibers exhibited effective ethylene degradation and slowed the color shift and softening of the tomatoes during storage. The results suggest great potential for use of the PAN@TiO2composite nanofibers as ethylene scavenging packaging material for fresh fruits and vegetables.
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高影响因子
Metals
·
2019
·Vol. 9
·期 2
·171
·
IF 2.259
Zhengyu Cai,Hui Kong
TiO2nanoparticles and Mg alloy were added to molten steel in sequence to investigate the inclusion and microstructure characteristics. Compared with a non-treated sample, these additives resulted in the formation of Ti–Mg-bearing inclusions, which proves that the additives were valid. The size evolution from nanometer-scale TiO2to micrometer-scale oxides hints at the agglomeration and growth of the TiO2nanoparticles, which is due to the possible formation of a liquid-capillary force, the decomposition reaction of TiO2, and the higher Gibbs free energy of the nanoparticle. Furthermore, the statistical analysis of the oxides indicated that with the addition of the TiO2nanoparticles and Mg alloy, the oxides were refined and their density was higher. Few pure MnS were observed in the treated sample. This is due to the fact that most oxides separated out in the liquid region at 1873 K based on the oxide composition and the calculated Al2O3–Ti3O5–MgO phase diagram. Thus, MnS preferred to segregate on them during solidification. After etching, it was found that the Ti–Mg-bearing oxide can induce the nucleation of intragranular acicular ferrites. The appearance of these acicular ferrites was not observed in the non-treated sample. This comparison indicates the effectiveness of the external adding method in oxide metallurgy.
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高影响因子
MATERIALS LETTERS
·
2012
·
IF 2.307
Shiguo Chen,Yujuan Guo,Shaojun Chen,Zaochuan Ge,Haipeng Yang,Jiaoning Tang
Incorporation of nanoparticles is becoming a new strategy for improving antibacterial activity . In this paper, Copper (Cu)/titanium dioxide (TiO 2 ) (CTD) nanocomposite was easily prepared by photocatalytic reduction, and its structure as well as antibacterial activity in the absence of light was investigated in detail. The results show that the CTD nanocomposite exhibits good antibacterial activity even in the absence of light. The minimal inhibition concentration against Escherichia coli and Staphylococcus aureus is 21.4 μg/mL and 14.3 μg/mL, respectively, which are much lower than that of pure silver, Cu and TiO 2 nanoparticles . In addition, the enhanced antibacterial effect of the CTD nanocomposite may be explained by synergistic antibacterial effect.
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高影响因子
SYNTHETIC METALS
·
2013
·
IF 2.109
Yakupjan Osman,Ruxangul Jamal,Adalet Rahman,Feng Xu,Ahmat Ali,Tursun Abdiryim
The poly(3,4-propylenedioxythiophene)/TiO 2 nanocomposites (PProDOT/TiO 2 ) were synthesized by using mechanochemical solvent free and common chemical solution method. The structure and physicochemical properties of the PProDOT/TiO 2 nanocomposites were compared with that of pure PProDOT. The results of FTIR and UV–vis spectra showed that the PProDOT/TiO 2 nanocomposites and pure PProDOT prepared by mechanochemical method displayed higher oxidation degree and conjugation length than the samples prepared by chemical method. The XRD and morphological analysis indicated that the TiO 2 had no effect on the crystallinity of PProDOT from both methods, and the TiO 2 well embedded in polymer matrix. Moreover, the results of the electrochemical performances showed that the PProDOT/TiO 2 nanocomposites and pure PProDOT synthesized by mechanochemical method had higher electrochemical activity than the samples from chemical method. The highest specific capacitance of 219 Fg −1 is obtained in the case of the mechanochemically synthesized PProDOT/TiO 2 nanocomposites.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Siyu Gong,Ting Zhang,Bingguo Liu,Peng Liu,Yifan Niu,Zhenxing Yang,Yuhao Jin,Wang Chen,Guangxiong Ji,Shenghui Guo,Libo Zhang
The study introduces a microwave-assisted rutile seed crystal (RS) method to synthesise mixed-phase TiO 2 nanoparticles, controlling the rutile TiO 2 (TiO 2 -R) phase content ( γ R ) from 33.0 % to 99.3 % by adjusting the doping level of RS to 20.0 wt% in the metatitanic acid (MA). The sample, designated as MA-20, with the highest oxygen vacancy (O v ) concentration of 38.56 %, demonstrated over 99 % microwave absorption (minimum reflection loss ( R L ) −56.8 dB) and a heating rate of 0.836 °C/s under 2000 W and 20 g. RS enhanced the dielectric property of MA, facilitating phase transition from anatase TiO 2 (TiO 2 -A) to TiO 2 -R above 600 °C, with critical temperatures between 800 and 1000 °C. MA-20, with a surface area of 1.9226 m 2 /g and pore size distribution of 9.0851 nm, showed that higher RS doping levels promoted phase transition and grain growth, thereby enhancing the crystallinity and charge transfer efficiency. More than 50 % of MA-20 particles were under 10 nm, and 94 % were below 100 nm, confirming the synthesis of TiO 2 nanomaterials. MA-20 exhibited excellent electromagnetic wave storage and conversion properties. Adjusting microwave parameters and RS levels controls γ R , offering an efficient approach for preparing mixed phase TiO 2 catalysts, essential for semiconductor photocatalysis and overcoming TiO 2 -A limitations.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Jihong Jiang,Han Wang,Junlin Lin,Zhiyong Liu,Laibo Li,Yali Li,Zongjin Li,Lingchao Lu,Yunjian Li,Zeyu Lu
Previous studies primarily considered TiO 2 as a nano-filler to accelerate cement hydration due to the nucleation site effect. However, hydroxyl free radicals (•OH), released from TiO 2 under UV irradiation, also exhibit great potential to accelerate cement hydration owing to their high nucleophilicity arising from unpaired electrons. This study is the first to reveal the accelerating mechanism of •OH generated by photoexcited nano-TiO 2 on cement hydration. Current experimental results indicated that 5.0 wt% addition of photoexcited nano-TiO 2 (under 6 h of UV irradiation during the early curing stage) improved the dissolution rate of tricalcium silicate (C 3 S) by 30 %, followed by a 35 % increase in the hydration degree of cement paste. More importantly, the polymerization degree and high-density content of C–S–H gels were also improved by 26 % and 13 %, accompanied by a 46 % reduction in porosity of the composites. All the aforementioned improvements were attributed to the presence of •OH generated by photoexcited nano-TiO 2 , which significantly accelerated cement hydration by accelerating C 3 S dissolution, facilitating faster nucleation and growth of C–S–H gels. In addition, the Density Functional Theory (DFT) calculations revealed that the accelerating effect of •OH on cement hydration may stem from the stronger interaction between •OH and the Ca ion on the C 3 S surface compared to the water molecule, and the increased surface nucleophilicity due to the dispersion of unpaired elections from •OH to all the O ions in the surface layer. These findings provide a high-efficiency approach to accelerate cement hydration by photoexcited nano-TiO 2 , thereby paving the way for the development of advanced and sustainable cement-based materials.
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产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yixin Ji,Zhongmin Su,Xiaochun Cui,Zhi Geng,Chi Wang
In recent years, nanofiltration (NF) membranes have garnered significant attention for water treatment and reuse applications, owing to their high separation efficiency, surface charge characteristics, and other advantages. However, the conventional support layer structures in NF membranes exhibit high permeation resistance, limiting their overall performance. To address this issue, an ideal through-hole structural support layer effectively minimizes resistance to water infiltration. The advent of advanced high-precision 3D printing technology facilitates the fabrication of such structures. In this study, a support layer with a straight-through pore structure was fabricated using advanced high-precision 3D printing technology, and the PES-COOH active layer was attached to the surface of the support layer via hydrogen bonding, resulting in the PES-COOH@3DP NF membrane. This innovation substantially reduced the permeation resistance, thereby enhancing the permeation flux of the NF process. The permeability of the PES-COOH@3DP NF membrane reached 6.64 L·m −2 ·h −1 ·bar −1 , which is double that of the PES-COOH@UF NF membrane. By incorporating varying concentrations of TiO 2 nanoparticles (0.5 %, 1 %, 1.5 %) into the photosensitive resin material, a hydrophilic support layer doped with TiO 2 nanoparticles was printed using a 3D printer. This improved the NF membrane's hydrophilicity, thereby enhancing its permeation flux. When the feed solution contained 1000 mg·L −1 Na 2 SO 4 , the [email protected] % TiO 2 3DP NF membrane exhibited a permeability of 8.56 L·m −2 ·h −1 ·bar −1 , 1.5 times that of the PES-COOH@UF NF membrane and 22 % higher than the commercial NF90 membrane, while retaining 98.76 % salt and demonstrating strong chlorine resistance. This study underscores the significant potential of advanced high-precision 3D printing technology, establishing it as a strong contender for next-generation NF membrane desalination development.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 4
·1-12
·
IF 3.8
Liu Yonghong,Yang Xiaoxiao,Wang Ning,Wang Quanhong
While high-efficiency photocatalysts have been extensively researched, there is still a scarcity of reports focusing on enhancing the practical application conditions of low-cost engineering photocatalysts. In this study, a 13.8-L continuous streamer catalytic reactor was developed utilizing low-cost self-made TiO 2 /ACF photocatalyst. Employing the Box-Behnke response surface method, the study assessed the reactor’s efficiency in treating organic wastewater using methylene blue (MB) as the model pollutant. The TiO 2 /ACF photocatalysis was characterized by XRD, EDS, and SEM, and the results showed that the nano-TiO 2 was uniformly loaded with the surface of activated carbon fibers in a lamellar form. Results indicated that with a single cycle time of 134 min and a catalyst amount of 95 cm × 95 cm, the average decolorization rate for 3 mg/L MB wastewater was 90.63%, following quasi-second-order kinetics. The MB wastewater’s decolorization efficiency swiftly reached 89.8% within the initial 120 min, maintaining around 90% during continuous 600-min treatment. The optimal catalyst condition was identified, enhancing photodegradation efficiency of MB organic molecules. The developed photocatalytic equipment exhibited high efficiency and stability in degrading low-concentration organic molecules.
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Food Bioscience
·
2025
·
IF 5.9
Yang Song,Tianyu Zhang,Xinyu Wang,Yuhe Zhang,Tinghuan Chang,Yang Li
A novel photoelectrochemical (PEC) biosensor of ZnS quantum dots (ZnS QDs) sensitized TiO 2 nanoparticles (TiO 2 NPs) was created for the detection of phosphatidylcholine (PC) in plant oil. The photocurrent intensity generated by the PEC biosensor in the presence of PC is fourfold that in the absence of PC. Electrochemical deposition of ZnS QDs effectively improves the photoelectric conversion performance of indium tin oxide (ITO)/TiO 2 NPs. The immobilization of phospholipase D (PLD) and choline oxidase (ChOx) on a photosensitive electrode achieved specific recognition of PC, and also played a role in amplifying photocurrent signals. This PEC biosensor exhibits a broad linear range between 0.003 mM and 7 mM, with a detection limit of just 0.4 μM. The PEC biosensor showed efficient selectivity to PC. Furthermore, the PEC biosensor has been proven to be demonstrated for PC in plant oil samples, with a recovery rate ranging from 96.6 % to 112 %.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Xi Liu,Yanhong Ji,Yinjie Sun,Ming Jing,Zunbo Han,Yunfei Song,Yangzhen Liu,Haoran Chen,Benqiao He
Biodegradable membranes can be decomposed after use, aligning seamlessly with the principles of eco-friendly environmental conservation prevalent in modern society. In this study, poly(butylene succinate) (PBS)/TiO 2 hybrid membranes have been prepared by adding nano-TiO 2 into biodegradable PBS. The impact of nano-TiO 2 on the structure, properties, and degradability of membrane are investigated. The incorporation of nano-TiO 2 has a favorable influence on the mechanical properties of membrane, with tensile strength increased by 80.37 %. When the TiO 2 content is 3 wt%, the hybrid membrane demonstrates a significant enhancement in pure water flux, reaching 56.41 L·m −2 ·h −1 . This flux is 6 times greater than that of pure PBS membrane. Meanwhile, the BSA rejection remains at approximately 95 %. Moreover, the flux recovery of membrane increases from 71.52 % to 96.19 %, and total fouling decreased from 57.09 % to 38.05 %. In long-term use, the permeation flux remains stable between 52.14 and 59.76 L·m −2 ·h −1 , and the BSA rejection is about 93.49 %. Consequently, the membrane maintains its fundamental performance. After service, hybrid membranes can be degraded immediately in alkali solution. This study provides a feasible solution for the development of green, efficient and degradable membranes for wastewater treatment, and opens up a new way for circular economy in membrane technology.
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Small
·
2024
·
IF 13
Li Luo,Kui Liang,Zeba Khanam,Xincheng Yao,Muhammad Mushtaq,Ting Ouyang,M.-Sadeeq Balogun,Yexiang Tong
Flexible lithium-ion batteries (FLIBs) are intensively studied using free-standing transition metal oxides (TMOs)-based anode materials. However, achieving high areal capacity TMO-based anode materials is yet to be effectively elucidated owing to the poor adhesion of the active materials to the flexible substrate resulting in low active mass loading, and hence low areal capacity is realized. Herein, a novel monolithic rutile TiO 2 microparticles on carbon cloth (ATO/CC) that facilitate the flower-like arrangement of TiO 2 nanowires (denoted ATO/CC/OTO) is demonstrated as high areal capacity anode for FLIBs. The optimized ATO/CC/OTO anode exhibits high areal capacity (5.02 mAh cm −2 @0.4 mA cm −2 ) excellent rate capability (1.17 mAh cm −2 @5.0 mA cm −2 ) and remarkable cyclic stability (over 500 cycles). A series of morphological, kinetic, electrochemical, in situ Raman, and theoretical analyses reveal that the rational phase boundaries between the microparticles and nanowires contribute to promoting the Li storage activity. Furthermore, a 16.0 cm 2 all-FLIB pouch cell assembled based on the ATO/CC/OTO anode and LiNiCoMnO 2 cathode coated on ATO/CC (ATO/CC/LNCM) exhibits impressive flexibility under different folding conditions, creating opportunity for the development of high areal capacity anodes in future flexible energy storage devices.
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PubMed
高影响因子
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