ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Mufan Wang,Shiying Fan,Xinyong Li,Jugong Shi,Yan Mao,Yaqi Yang,Gao Li
Efficiently upgrading 5-hydroxymethylfurfural (HMF) into high-value-added products, such as 2,5-diformylfuran (DFF) and 2,5-furan dicarboxylic acid (FDCA), through a photocatalytic process by using solar energy has been incessantly pursued worldwide. Herein, a series of transition-metal (TM = Ni, Fe, Co, Cu) single atoms were supported on Ti4+αTi3+1-αO2−δ nanofibers (NFs) with certain defects (Ov), denoted as TM SAC-Ti4+αTi3+1-αO2−δ NFs (TM = Ni, Fe, Co, Cu), aiming to enhance the photocatalytic conversion of HMF. A super HMF conversion rate of 57% and a total yield of 1718.66 μmol g–1 h–1 (DFF and FDCA) surpassing that of the Ti4+αTi3+1-αO2−δ NFs by 1.6 and 2.1 times, respectively, are realized when TM is Co (Co SAC-Ti4+αTi3+1-αO2−δ NFs). Experiments combined with density functional theory calculation (DFT) demonstrate that the TM single atoms occupy the Ti site of Ti4+αTi3+1-αO2−δ NFs, which plays a dominant role in the photo-oxidation of HMF. Raman, X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) characterizations confirm the strong electron local exchange interaction in TM SAC-Ti4+αTi3+1-αO2−δ NFs and demonstrate the substitution of Ti by the TM SACs. The projected density of states and charge density difference reveal that the strong interaction between metal-3d and O-2p orbitals forms Ti–O–TM bonds. The bonds are identified as the adsorption site, where TM single atoms on the surface of Ti4+αTi3+1-αO2−δ NFs reduce HMF molecule adsorption energy (Eads). Furthermore, the TM single atom modulates the electronic structure of TM SAC-Ti4+αTi3+1-αO2−δ NFs through electron transfer, leading to narrow band gaps of the photocatalysts and enhancing their photocatalytic performance. This study has uncovered a newer strategy for enhancing the photocatalytic attributes of semiconducting materials.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 6
·1302
·
IF 3.057
Danning Kang,Jun Li,Yuyao Zhang
Titanium dioxide (TiO2), as a potential anode material applied for lithium-ion batteries (LIBs), is constrained due to its poor theoretical specific capacity (335 mAh·g−1) and low conductivity (10−7-10−9S·cm−1). When compared to TiO2, NiO with a higher theoretical specific capacity (718 mAh·g−1) is regarded as an alternative dopant for improving the specific capacity of TiO2. The present investigations usually assemble TiO2and NiO with a simple bilayer structure and without NiO that is immersed into the inner of TiO2, which cannot fully take advantage of NiO. Therefore, a new strategy was put forward to utilize the synergistic effect of TiO2and NiO, namely doping NiO into the inner of TiO2. NiO-TiO2was fabricated into the nanofibers with a higher specific surface area to further improve their electrochemical performance due to the transportation path being greatly shortened. NiO-TiO2nanofibers are expected to replace of the commercialized anode material (graphite). In this work, a facile one-step electrospinning method, followed by annealing, was applied to synthesize the Ni-doped TiO2nanofibers. The Ni doping content was proven to be a crucial factor affecting phase constituents, which further determined the electrochemical performance. When the Ni doping content was less than 3 wt.%, the contents of anatase and NiO were both increased, while the rutile content was decreased in the nanofibers. When the Ni doping content exceeded 3 wt.%, the opposite changes were observed. Hence, the optimum Ni doping content was determined as 3 wt.%, at which the highest weight fractions of anatase and NiO were obtained. Correspondingly, the obtained electronic conductivity of 4.92 × 10−5S⋅cm−1was also the highest, which was approximately 1.7 times that of pristine TiO2. The optimal electrochemical performance was also obtained. The initial discharge and charge specific capacity was 576 and 264 mAh·g−1at a current density of 100 mA·g−1. The capacity retention reached 48% after 100 cycles, and the coulombic efficiency was about 100%. The average discharge specific capacity was 48 mAh·g−1at a current density of 1000 mA·g−1. Approximately 65.8% of the initial discharge specific capacity was retained when the current density was recovered to 40 mA·g−1. These excellent electrochemical results revealed that Ni-doped TiO2nanofibers could be considered to be promising anode materials for LIBs.Keywords:electrospinning;Ni doping;TiO2nanofibers;phase transition;lithium ion battery
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
CHEMICAL PHYSICS
·
2020
·
IF 1.771
Yuejun Li,Tieping Cao,Zemin Mei,Xiaoping Li,Dawei Sun
Among tremendous efforts for enhanced photocatalysis, construction of heterojunction has been deemed as an effective means. In comparison with type II heterojunction, type I heterojunction receives less attention due to accumulation and increased recombination of charge carriers in one side of heterojunction. Herein, we take NaBi(MoO 4 ) 2 /Bi 2 MoO 6 as an example of type I heterojunction and explore means to improve the photocatalytic performance of NaBi(MoO 4 ) 2 /Bi 2 MoO 6 heterojunction. We employ TiO 2 electrospun nanofibers as substrates and separately grow NaBi(MoO 4 ) 2 and Bi 2 MoO 6 nanostructures on the skeleton of TiO 2 . The characterization results show that TiO 2 changes type I heterojunction into multiheterojunction integrating two type II heterojunctions. Photocatalytic tests demonstrate that as-constructed multi-heterojunction is of higher activity than that of single type I or II heterojunction, respectively, where photogenerated electrons are accumulated on the surface of TiO 2 and photogenerated holes are accumulated on NaBi(MoO 4 ) 2 and Bi 2 MoO 6 , respectively. This study highlights the potential application of TiO 2 electrospun nanofibers in the construction of multiheterojunction for enhanced visible light photocatalysis.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Catalysis Science & Technology
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2021
·Vol. 11
·期 12
·4181-4195
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IF 6.119
Fan Fu,Yufan Zhang,Yan Zhang,Yuyue Chen
In this experiment, Mn@TiO2 nanofibers in the form of membranes were fabricated by ordinary electrospinning and a higher temperature calcination process. Field-emission scanning, X-ray diffraction analysis, X-ray photoelectron spectroscopy, Raman spectra, UV-visible diffuse spectra, UV-visible spectroscopy, and Brunauer–Emmett–Teller (BET) evaluation were used to characterize the resulting samples. The study revealed that, upon the addition of the manganese ion, the continuous and mechanical properties of the nanofibers and nanofilms were substantially enhanced. Notably, after 60 minutes, the Mn@TiO2-0.10 degradation efficiency reached 94.92% under ultraviolet light, which was 5 times greater than that for TiO2 nanofibers. It was due to the controlled mixture phase and palpable raised specific surface area, which ensured a pronounced enhanced photocatalytic activity of the nanofibers. In addition, the application of nanofibers on the capacitor aspect was explored by electrochemical workstations. The highest photoactivity sample performed mass-specific capacity as high as 5.09 F g−1. Such efficient capacity and higher photoactivity of the photocatalyst shed light on the preparation of soft inorganic materials and their application in energy conversion.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2016
·
IF 4.012
Wenwen Ma,Yan Xu,Kaiwen Ma,Hong Zhang
H 3 PW 12 O 40 /TiO 2 (abbreviated PW 12 /TiO 2 ) nanofibers catalysts have been successfully prepared via calcinating off the respective electrospun PVP/[PW 12 + Ti(OC 4 H 9 ) 4 ] composite nanofibers for the first time and they show ultra-deep desulfurization catalytic performance in mild conditions. PW 12 /TiO 2 nanofibers consist of anatase phase TiO 2 and Keggin structure PW 12 , the diameter of which is approximately 100 nm. Compared with PW 12 /TiO 2 nanoparticles, 40 wt.% PW 12 /TiO 2 nanofibers (the weight percentage of PW 12 loading on TiO 2 nanofibers was 40%) exhibited the higher catalytic activity under the same conditions. DBT could be removed completely within 30 min at 70 °C using 0.02 g 40 wt.% PW 12 /TiO 2 nanofibers as catalysts, when ionic liquid (IL) [Bmim]PF 6 was as extraction agent. Additionally, sulfur removal of different substrates decreased in the following orders: DBT > BT > 4,6-DMDBT under the same conditions. Even after 5-times recycling, the catalytic activity of 40 wt.% PW 12 /TiO 2 nanofibers was not significant decreased. As a total result, these novel PW 12 /TiO 2 nanofibers can be used to deeply desulfurize in the industry.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2018
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IF 2.593
He Lian,Zhaoxu Meng
Over the past years, the high catalytic property of electrospun nanofibers attracted more attention in the field of catalysis. Titanium dioxide (TiO 2 ) electrospun nanofibers and their modifications have become the focus of the photocatalysis research owing to their high surface to volume ratio, high porosity and non-toxicity. So far, however, it has not been applied in the photocatalytic devices because the bad self-supporting is still the main drawback to prevent their practical application. Here, a novel three-dimensional porous membrane of hybrid TiO 2 /bioglass, which could be adhered on different carriers as “wallpaper” only by a short time of heating, has been fabricated in this work. Though microfluidic electrospinning, the hybrid nanofibrous membrane could be divided into three thin layers according to the components of the fiber. The top layer of the hybrid nanofibrous membrane, containing 90% TiO 2 in the fiber, would maintain three-dimensional interconnected porous structure with the increasing of its thickness, revealing highly photocatalytic activity . In addition, the bottom bioglass (70SiO 2 ·25CaO·5P 2 O 5 ) nanofibrous layer of the hybrid TiO 2 /bioglass membrane made the membrane adhere on different carriers firmly through heating within 5 s. The hybrid membrane exhibited higher photocatalytic efficiency than the thin film of TiO 2 , which would be expected to be used in the preparation of photocatalytic devices.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2022
·
IF 2.042
Houkui Gong,Qichang Zhou,Feilin Lin,Wenqi Qin,Siqi Zhang,Shujuan Yang,Jiacheng Li,Yuhong Feng
Control over the self-assembly of micro- and nano-scopic building blocks is highly important but very challenging in the fabrication of many hierarchical composite materials. We prepared a novel electrospun nanofiber on the basis of Pickering emulsion synergy-stabilized by titanium dioxide/modified sodium alginate/polyoxyethylene(TiO2/Ugi-Alg/PEO). The emulsion stability was evaluated using turbiscan stability index, rheology and confocal laser scanning microscope. The results showed that TiO2/Ugi-Alg/PEO could form a relatively thick interfacial particle film at the oil-water interface, which was helpful to reduce the extent of agglomeration among droplets due to the steric hindrance mechanism. Pickering emulsion was utilized as a template to prepare nanofibers with uniform and orderly distribution of TiO2 by electrospinning technology, which had a good photodegradation effect on pesticide lambda-cyhalothrin residues. The self-assembly of nanoparticles at the oil-water interface and its combination with electrospinning technology to prepare nanofibers containing TiO2 photodegradation activity are expected to be a new strategy to avoid pesticide long persistence period in the soil environment.
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Yuzhou Wu,Jiawei Wu,Chuang Zhu,Liang Zhang,Jianhua Yan
Continuous TiO 2 nanofibers (NFs) with the merits of high photochemical activity, adjustable active sites, and easy to recycle have triggered a huge interest in the catalysis fields. Nevertheless, they are easy to break due to the intrinsic brittleness of ceramic TiO 2 . Here, we report a Mxene-intercalation toughening strategy to fabricate flexible TiO 2 NF films with a sol–gel electrospinning method followed by a low-temperature calcination. The in-situ doping of MXene (Ti 3 C 2 T x ) nanosheets in TiO 2 NFs reduces the grain sizes and introduces 2D defective MXene-derived TiO 2 planes, the former creates sinuous grain boundaries that can reduce crack propagation, while the latter generates elastic brick–mortar structures of allomorph junctions that can absorb more external work. The dual functions remarkably enhance the breaking strength of TiO 2 NFs from 0.06 to 0.16 MPa. Fascinatingly, this strategy reduces the bandgap of TiO 2 and more efficiently conduct photogenerated carriers. The evolution rate of photocatalytic CO 2 reduction into CH 4 reaches 31.6 μmol/g/h without using sacrificing agents and photosensitizers. The reported facile strategy simultaneously enhances the flexibility of TiO 2 nanofibers and photocatalytic efficiency.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Lei Cui,Siliang Liu,Fangke Wang,Jingyao Li,Yanhua Song,Ye Sheng,Haifeng Zou
In this work, uniform g-C 3 N 4 shells have grown on the surface of electrospinning TiO 2 nanofibers to form one dimensional core/shell structured TiO 2 /g-C 3 N 4 nanofibers by a facial melamine-involved vapor deposition approach. During the heat treatment process in a simple setup, the TiO 2 nanofibers served as supports to prevent the collapses and aggregations of g-C 3 N 4 while forming heterojunctions with g-C 3 N 4 at the interface. The as prepared heterogeneous TiO 2 /g-C 3 N 4 photocatalyst exhibited remarkably enhanced visible light photocatalytic activity for RhB degradation by maxing heterojunctions at the core/shell interface. The photodegradation reaction rate constant of the obtained heterojunction is 0.064 min −1 , which is 4.0 times that of pure g-C 3 N 4 (0.016 min −1 ). To reach higher RhB degradation efficiency (>90%), TiO 2 /g-C 3 N 4 shortened the irradiation time by 60 min compared with individual components (pure g-C 3 N 4 or TiO 2 nanofibers). The remarkably high photocatalytic performances are mainly ascribed to the synergetic effect of efficient photogenerated charge separation properties and decreased electron transfer resistance of the heterojunctions formed between g-C 3 N 4 and TiO 2 . We believe the proposed simple method and setup is an attractive strategy for constructing one dimensional g–C 3 N 4 –based nano-heterojunctions with excellent photocatalytic properties.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2013
·
IF 0
Meng Wang,Ming Hao Fang,Chao Tang,Zhao Hui Huang,Yang Ai Liu,Xiao Wen Wu
Er3+ doped ZnO-TiO2 nanofibers with diameter of 100～200 nm were prepared by electrospinning mothed after calcined at high temperature, using polyvinylpyrrolidone(PVP), Zn(NO3)2·6H2O, Er(NO3)3·5H2O, Ti(OC4H9)4 as raw materials. The composite nanofibers were characterized by XRD, SEM, and UV-V respectively. Effects of different calcined temperatures on structure and photocatalytic degradation were investigated. The results indicated that the crystallinity becomes better with the increasing of calcination temperature. The composite nanofibers had the best effects of photocatalytic degradation of methylene blue, when Er3+ doping content was 0.3 wt.% and calcined temperature was 500 °C.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Cheng Rong,Xia Jin-cheng,Shen Liang-jie,Shen Zhi-peng,Shi Lei,Zheng Xiang,Zheng Jian-zhong
Photocatalytic disinfection is a promising technology with low cost and high efficiency. However, most of the current studies on photocatalytic disinfection ignore the widespread presence of natural organic matter (NOM) in water bodies, so the incomplete conclusions obtained may not be applicable. Herein, this paper systematically studied the influence of humic acid (HA), one of the most important components of NOM, on the photocatalytic inactivation of bacteriophage f2 with electrospinning Cu-TiO 2 nanofibers. We found that with the addition of HA, the light transmittance of the solution at 550 nm decreased from 94 to 60%, and the band gap of the photocatalyst was increased from 2.96 to 3.05 eV. Compared with reacting without HA, the degradation amount of RNA of f2 decreased by 88.7% after HA was added, and the RNA concentration increased from 1.95 to 4.38 ng·μL −1 after the reaction. Hence, we propose mechanisms of the effect of HA on photocatalytic disinfection: photo-shielding, passivation of photocatalysts, quenching of free radicals, and virus protection. Photo-shielding and photocatalyst passivation lead to the decrease of photocatalyst activity, and the reactive oxygen species (ROSs) (·OH, ·O 2 − , 1 O 2 , H 2 O 2 ) are further trapped by HA. The HA in water also can protect the shape of phage f2 and reduce the leakage of protein and the destruction of ribonucleic acid (RNA). This work provides an insight into the mechanisms for the influence of HA in photocatalytic disinfection process and a theoretical basis for its practical application.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
PubMed
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
·
IF 4.706
Nan Zhang,Feng Li,Yanyang Yin,Jing Han,Xin Li,Caixia Liu,Jingran Zhou,Shanpeng Wen,Samira Adimi,Yu Chen,Xin Song,Shengping Ruan
WO 3 -TiO 2 heterostructural nanofibers (HNFs) were prepared by a simple two-step process. The structures, chemical constitutions and morphologies of the samples were characterized by various kinds of techniques, including XRD, XPS, EDX, SEM and TEM. The results suggested that WO 3 nanocubes with a size range of 80–120 nm were decorated uniformly on the surface of TiO 2 nanofibers in the WO 3 -TiO 2 samples. XPS results confirmed the existence of W 5+ and the increased amount of both chemisorbed oxygen species and oxygen vacancies after the WO 3 nanocubes were decorated on the surface of TiO 2 nanofibers. Compared with the pure materials, the WO 3 -TiO 2 HNFs exhibited higher response, better selectivity and lower limit detection to xylene. The improvement of the performance can be attributed to the formation of heterojunction between TiO 2 and WO 3 and the conversion between W 6+ and W 5+ . The sensing mechanism of the enhanced gas sensing properties was also discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）