ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 413
·期 1
·193-203
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IF 3.637
Yang Liwei,Li Lele,Li Fen,Zheng Hejie,Li Tongtong,Liu Xiaoqiang,Zhu Jichun,Zhou Yanmei,Alwarappan Subbiah
Herein, a photoelectrochemical (PEC) aptasensing platform was designed by integrating surface oxygen vacancy (OV) defects, Ti 3+ self-doping, the heterojunction, and resonance energy transfer (RET) effect into one platform for the detection of diclofenac sodium (DCF). Briefly, OV defects were introduced on TiO 2 nanospheres with simultaneous Ti 3+ self-doping, followed by a well-separated deposition of FeVO 4 nanoparticles on TiO 2 to obtain a Ti 3+ -O-TiO 2 /FeVO 4 heterojunction. The surface modification of OVs, Ti 3+ doping, and deposition of FeVO 4 were confirmed by SEM, XPS, EPR, DRS, and PEC measurements. The surface OVs and doping of Ti 3+ species created a new donor (defect) energy level under the conduction band of TiO 2 , which minimized the bandgap and thereby improved the visible light absorption of TiO 2 . Moreover, the capture of photo-excited electrons by surface OVs could hinder the electron-hole recombination. Due to the intimate surface contact and perfect energy matching between TiO 2 and FeVO 4 , the formation of heterojunction decreased the bandgap and facilitated the electron-hole separation of TiO 2 . All these above events contributed to the enhancement of the PEC signals, which were then quenched by the RET effect between Ti 3+ -O-TiO 2 /FeVO 4 and Au nanoparticle (AuNP)–labeled cDNA that had been attached to its complementary DCF aptamer on Ti 3+ -O-TiO 2 /FeVO 4 |ITO. The addition of target-DCF detached AuNP-labeled cDNA from the electrode to recover the photocurrent, resulting in a “signal-on” PEC aptasensor that exhibited a 0.1–500-nM linear range and a detection limit of 0.069 nM for DCF, attributed to the excellent amplification of the proposed aptasensing platform.
研究领域:
分析化学
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环境科学
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材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Lei Dai,Peng Fu,Jieming Chen,Fazhe Sun
The band gap width has always been the main reason for the low photocatalytic performance of TiO 2 semiconductors. “Band gap engineering” is often used to change the band gap width of TiO 2 . On this basis, the impurity band gap was induced below the TiO 2 conduction band by regulating N element. What's interesting was that N element adjusted the valence state of adjacent Ti element and caused the generation of oxygen vacancy . This is due to the extraction of neutral oxygen atoms, resulting in electron transfer to the Ti cation band structure . The 300-N-T catalyst exhibited the best photocatalytic hydrogen production performance under visible light, which was 307.65 μmol/(g·h) and was 61.53 times higher than that of anatase. And the concentration of Ti 3+ defects and oxygen vacancy reduced with decreasing of N content in TiO 2 . According to Kubelke Munk formula, the band gap of 300-N-T photocatalyst was narrowed to 2.73 eV, which indicated that there are impurity energy levels near the CB and VB of TiO 2 material. The Ti 3+ ions as the active site of the photocatalytic reaction was confirmed by instantaneous photocurrent response and EIS characteristic. This study revealed the structure-activity relationship between the content of N element, Ti 3+ ions and oxygen vacancy in TiO 2 materials, as well as the decisive process of defect induced visible light catalysis.
研究领域:
材料科学
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催化
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光催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Yucheng Li,Jing Liu,Jing He,Luying Wang,Jiandu Lei
The effect of titanium as a promoter for the nickel-cobalt/silica-titania (NiCo/Si-Ti) catalyst in the hydrogenation of phenol was comparatively studied. In the phenol hydrogenation under mild reaction conditions (1 MPa H 2 pressure and 100 °C), the Ti-promoter induces the formation of the Co δ− −O V −Ti 3+ active sites and enhances the hydrogenation activity of the NiCo/Si catalyst to convert phenol to cyclohexanol. The catalytic hydrogenation with the optimal composition of the NiCo/Si-1.0Ti (Si:Ti ratio of 8.5:1) catalyst was completed within 1 h (conversion 98.2 % and selectivity >99 %), which was more efficiently than that with other Ti-doped catalysts and NiCo/Si as baseline, indicating a strong positive synergistic effect between the metal (Ni-Co) and support (Ti-Si) components of the catalyst in this reaction. Additionally, the kinetics, pathway and catalytic mechanism of the hydrogenation of phenol are also examined. Furthermore, the NiCo/Si-1.0Ti catalysts also showed a good performance at reducing the unstable oxygenated compounds in the bio-oil.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 38
·2302831
·
IF 13.3
Tianhao Yao,Hongkang Wang,Xin Ji,Deyu Wang,Qingmiao Zhang,Lingjie Meng,Jian-Wen Shi,Xiaogang Han,Yonghong Cheng
Titanium dioxide (TiO 2 ) is a promising anode material for sodium–ion batteries (SIBs), which suffer from the intrinsic sluggish ion transferability and poor conductivity. To overcome these drawbacks, a facile strategy is developed to synergistically engineer the lattice defects (i.e., heteroatom doping and oxygen vacancy generation) and the fine microstructure (i.e., carbon hybridization and porous structure) of TiO 2 -based anode, which efficiently enhances the sodium storage performance. Herein, it is successfully realized that the Si-doping into the MIL-125 metal-organic framework structure, which can be easily converted to SiO 2 /TiO 2–x @C nanotablets by annealing under inert atmosphere. After NaOH etching SiO 2 /TiO 2–x @C which contains unbonded SiO 2 and chemically bonded Si O Ti, thus the lattice Si-doped TiO 2–x @C (Si-TiO 2–x @C) nanotablets with rich Ti 3+ /oxygen vacancies and abundant inner pores are developed. When examined as an anode for SIB, the Si-TiO 2–x @C exhibits a high sodium storage capacity (285 mAh g −1 at 0.2 A g −1 ), excellent long-term cycling, and high-rate performances (190 mAh g −1 at 2 A g −1 after 2500 cycles with 95.1% capacity retention). Theoretical calculations indicate that the rich Ti 3+ /oxygen vacancies and Si-doping synergistically contribute to a narrowed bandgap and lower sodiation barrier, which thus lead to fast electron/ion transfer coefficients and the predominant pseudocapacitive sodium storage behavior.
研究领域:
材料科学
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能量存储
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纳米技术
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电池技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jingtao Zhang,Mengwan Zhai,Xueying Wang,Shurui Liu,Lijuan Zhang,Xing Liu,Yao Geng,Xiaodong Sun,Bingkun Liu
In the present work, Ti 3+ -self-doped TiO 2 heterostructure photocatalysts were prepared by coupling with different additions of palladium quantum dots by means of deposition-reduction methodology. The electron paramagnetic resonance (EPR) analysis indicated the existence of Ti 3+ in synthesized samples. The transmission electron microscopy (TEM) images presented the modification of TiO 2-x nanoparticles by coupling with nano palladium. Photoluminescence (PL) results demonstrated the lowest charge carrier recombination rate in 5% Pd/TiO 2-x composites. Photocatalytic performances of photocatalysts were evaluated by degrading Tetracycline (TC) and inactivating Escherichia coli ( E. coli ) and Fusarium oxysporum f. sp. Vasinfectum ( Fov ) with the presence of visible light , in which an enhanced photocatalytic degradation and inactivation activity was found in all Pd coupled composites with the highest efficiency in 5% Pd/TiO 2-x . The improved photocatalytic activity of Pd/TiO 2-x was associated to the generation of more hydroxyl radicals (•OH) and superoxide anions radicals (•O 2- ) during photocatalytic process which were demonstrated by the electron spin-resonance spectroscopy (ESR) technique. Moreover, 5% Pd/TiO 2-x composites were found to remain high photocatalytic properties in a circulating photo-disinfection system.
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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光催化
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水处理
✓ 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）