JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Peng Wang,Changchao Jia,Jia Li,Ping Yang
A high efficiency photocatalyst , TiO 2 (B)/anatase spheres consisted of nanosheets were prepared. Thioglycolic acid (TGA) was added into the precursor to control the hydrolysis process of titanium source (TiCl 3 ), which is a key to adjust the microstructure of products. The results indicated that TGA-modified samples revealed enhanced photocatalysis performance compared with the one without TGA. The photocatalysis performance of TGA-modified sample is about 15 times high compared with commercial P25. This is ascribed to mixed crystal phase and lattice distortion which resulted in more activity sites (e.g. Ti 3+ and oxygen defects). The loading of Au nanoparticles in different ways confirms that rich Ti 3+ -oxygen vacancies on the surface of samples caused super photocatalytic performance.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 6
·060535
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IF 3.1
Tianzi Liang,Yagang Yang,Hanqing Dong,Kai Yu,Qiushi Song,Zhiqiang Ning,Hongwei Xie
A simple synthesis for the Ti3+-doped, small Li4Ti5O12 is favorable for its application as an anode material of lithium-ion batteries. This study presents a direct synthesis method of high-performance Li4Ti5O12 (LTO-Ti) with the Ti3+ self-doped and uniformly small in size. It is carried out by the redox of an electrochemical electrode pair of Ti and Fe2O3 at a constant potential in molten KCl-LiCl salt with Li2CO3. The synthesis mechanism and the effect of synthesis conditions on the formation and properties of LTO-Ti were investigated in detail. The LTO-Ti with an average size of approximately 400 nm is prepared by the ionic level synthesis method, and exhibits a superior specific capacity of 130.5 mAh·g−1 at 10 C current density, which is 73.6% of its average specific capacity at 1 C. Moreover, it also shows good cycling stability with a specific capacity of 127.2 mAh·g−1 after 1000 cycles at 5 C (capacity retention of 96.9%). This synthesis is secure and prospective.
研究领域:
材料科学
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电化学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 39
·24144-24155
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IF 3.361
Xingdong Yang,Jiyan Qu,Linxi Wang,Jianhong Luo
In an attempt to realize the efficient treatment of NOx, a mixed catalyst of Ti3+ self-doped TiO2−x and γ-Al2O3 was constructed by reducing commercial TiO2. The degradation effect on NOx was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO2−x could achieve considerable degradation effects (84.84%, SIE = 401.27 J L−1) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO2 (73.99%) or a single plasma degradation process (26.00%). The presence of Ti3+ and oxygen vacancies in TiO2−x resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NOx to NO2− and NO3− during the plasma-induced “pseudo-photocatalysis” process. Meanwhile, the TiO2−x showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO2−x could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti3+ self-doped TiO2−x with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NOx.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Catalysts
·
2019
·Vol. 9
·期 11
·927
·
IF 3.444
Aiguo Han,Mei Li,Shengbo Zhang,Xinli Zhu,Jinyu Han,Qingfeng Ge,Hua Wang
In recent years, defective TiO2-based composite nanomaterials have received much attention in the field of photocatalysis. In this work, TiB2was used as a precursor to successfully prepare Ti3+defective TiO2(TiO2-B) with a truncated bipyramidal structure by a one-step method. Then, the SnS2nanosheets were assembled onto the as-prepared TiO2-B through simple hydrothermal reaction. TiO2-B exhibits strong visible light absorption properties, but the recombination rate of the photo-generated electron-hole pair was high and does not exhibit ideal photocatalytic performance. Upon introducing SnS2, the heterojunction catalyst SnS2-Ti3+defective TiO2(SnS2/TiO2-B) not only possesses the strong light absorption from UV to visible light region, the lowest photo-generated charge recombination rate but also achieves a more negative conduction band potential than the reduction potential of CO2to CO, and thereby, exhibits the significantly enhanced selectivity and yield of CO in photocatalytic CO2reduction. Notably, SnS2/TiO2-B produces CO at a rate of 58 µmol·h−1·g−1with CO selectivity of 96.3% under visible light irradiation, which is 2 and 19 times greater than those of alone TiO2-B and SnS2, respectively. Finally, a plausible photocatalytic mechanism on SnS2/TiO2-B was proposed that the electron transfer between TiO2and SnS2follows the Z-scheme mode. Our results present an effective way to gain highly efficient TiO2based photocatalysts for CO2reduction by combining different modification methods of TiO2and make full use of the synergistic effects.Keywords:photocatalytic CO2reduction;TiO2nanoplates;SnS2nanosheets;Ti3+defective TiO2
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 COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yujiao Zhang,Yan Wang,Zhao Hu,Jinshu Huang,Song Yang,Hu Li
Exploring the real force that drives the separation of Coulomb-bound electron-hole pairs in the interface of heterojunction photocatalysts can establish a clear mechanism for efficient solar energy conversion efficiency. Herein, the formation of oxygen vacancy (Ov) and isolated Ti 3+ was precisely regulated at the interface of g-C 3 N 4 /TiO 2 Z-scheme heterojunction (g-C 3 N 4 /Ov-Ti 3+ -TiO 2 ) by optimizing the opening degree of the calcination system, showing excellent production rate of CO and CH 4 from CO 2 photoreduction under visible light. This photocatalytic system also exhibited prominent stability. Combining theoretical calculation and characterization, the introduction of Ov and isolated Ti 3+ on the interface could construct a charge transfer channel to break the forbidden transition of n → π*, improving the separation process of photoexcited electron-hole pairs. The photoexcited electrons weakened the covalent interaction of C O bonds to promote the activation of adsorbed inert CO 2 molecules, significantly reducing the energy barrier of the rate-limiting step during CO 2 reduction. This work demonstrates the great application potential of reasonably regulating heterojunction interface for efficient photocatalytic CO 2 reduction.
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
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Ying Liang,Guohe Huang,Yongping Li,Yao Yao,Xiaying Xin,Xiang Li,Jianan Yin,Sichen Gao,Yuwei Wu,Xiujuan Chen,Renfei Feng
The challenge from pathogenic infections still threatens the health and life of people in developing areas. An efficient, low-cost, and abundant-resource disinfection method is desired for supplying safe drinking water . This study aims to develop a novel Ti 3+ doping TiO 2 nanoparticle decorated ceramic disk filter (Ti 3+ /TiO 2 @CDF) for point-of-use (POU) disinfection of drinking water. The production of Ti 3+ /TiO 2 @CDF was optimized to maximize disinfection efficiency and flow rate. Under optimal conditions, the log reduction value (LRV) could reach up to 7.18 and the flaw rate was 108 mL/h. The influences of environmental factors were also investigated. Natural or slightly alkaline conditions, low turbidity , and low concentration of humic acid were favorable for the disinfection of Ti 3+ /TiO 2 @CDF, while co-existing HCO 3 − ions and diatomic cations (Ca 2+ and Mg 2+ ) exhibited the opposite effect. Furthermore, the practicability and stability of Ti 3+ /TiO 2 @CDF was demonstrated. Ti 3+ /TiO 2 @CDF showed high disinfection efficiency for E. coli and S. aureus under a range of concentrations. Long-term experiment indicated that Ti 3+ /TiO 2 @CDF was stable. The underlying disinfection mechanisms were investigated and concluded as the combination of retention, adsorption, and photocatalytic disinfection. The developed Ti 3+ /TiO 2 @CDF can provide an effective and reliable disinfection tool for POU water treatment in remote area.
研究领域:
环境科学
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材料科学
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微生物学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 20
·6138-6144
·
IF 0
Hongye Zhang,Yanfei Zhao,Sha Chen,Bo Yu,Jilei Xu,Huanjun Xu,Leiduan Hao,Zhimin Liu
Ti3+ self-doped TiOx@anatase core–shell structures were prepared via hydrolysis of Ti2(SO4)3 around TiO particles, followed by post-calcination at temperatures from 723 to 823 K. The as-prepared TiOx@anatase was examined by means of transmission electronic microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. It was demonstrated that the samples displayed core–shell structures with the shell in the anatase form and the core in the anatase and rutile phases, and a large number of Ti3+ ions were present. Electron paramagnetic resonance analysis indicated that the Ti3+ ions were located throughout the whole sample, including the shell, the core and the interface between the core and the shell. The as-prepared TiOx@anatase core–shell catalysts can absorb visible light and showed good activity for catalyzing the degradation of Rhodamine B under visible light irradiation. In particular, the TiOx@anatase obtained at 773 K showed the best performance, due to the high concentration of well-dispersed Ti3+ ions in the sample.
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
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Siqi Yu,Bing Han,Yunchao Lou,Guodong Qian,Zhiyu Wang
The fabrication of heterojunctions or homojunctions between semiconductors is a controllable strategy to facilitate charge separation in photocatalysis. The homophase junctions exhibit atomic-level contact for the fast-speed charge transfer via inducing the built-in electric fields. Herein, a new concept of TiO2 quasi-core–shell homophase junction induced by a Ti3+ concentration difference for remarkably enhancing photocatalytic activity is proposed. Nano anatase TiO2 quasi-core–shell homophase junctions are constructed between the interior with high Ti3+ concentration (quasi-core) and the surface with no detected Ti3+ (quasi-shell). Diverse Ti3+ concentration differences are obtained via regulating the mass ratio of the Ti source. The nano anatase TiO2 quasi-core–shell homophase junctions exhibit improved photocatalytic hydrogen evolution compared with commercial anatase nanoparticles. To be specific, the maximum hydrogen evolution rate of 50.02 mmol/h/g is 25.4 times superior to that of commercial anatase nanoparticles under solar illumination. Besides, the photocatalytic activity remains stable (H2 evolution rate of 49.21 mmol/h/g, activity loss of <2%) after five cycles of catalytic test. The promoted photocatalytic activities are ascribed to the constitution of a built-in electrical field between the quasi-shell and quasi-core induced by the band bending, which accelerates the spatial charge separation and suppresses the recombination of carriers. Moreover, the atomic-level contact at the homophase junction interface provides smooth channels for carrier transfer, resulting in more effective separation and transfer of photogenerated electrons and holes. The synthesis of nano anatase TiO2 quasi-core–shell homophase junctions provides new insights into the efficient separation and transfer of photogenerated carriers for photocatalytic applications.
研究领域:
材料科学
·
光催化
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jiajie Xu,Guodong Dai,Biyu Chen,Donglin He,Yue Situ,Hong Huang
An efficient heterogeneous photocatalytic process coupling photocatalysis and Fenton-like process was carried out, where the Fenton-like cycle could be driven by self-produced H 2 O 2 rather than extra H 2 O 2 addition. It was revealed that C 3 N 4 por exhibited good performance at H 2 O 2 production in pure water, which was enhanced up to eight times than bare g-C 3 N 4 . Fenton-like cycle was constructed in Ti 3+ -TiO 2 -C 3 N 4 por as C 3 N 4 por severed as H 2 O 2 donator, while the Ti 3+ -TiO 2 was able to provide photoinduced electrons for the Fenton-like process, resulting in the generation of much more OH radical. In addition, ESR spectra were performed to confirm the promotion of the Fenton-like cycle and much more OH radical was detected in Ti 3+ -TiO 2 -C 3 N 4 por than Ti 3+ -TiO 2 -C 3 N 4 due to the great improvement in H 2 O 2 production of C 3 N 4 por. What’s more, the feasible photocatalytic mechanism of Ti 3+ -TiO 2 -C 3 N 4 por composite was also proposed.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
·
IF 4.2
Min Yuan,Ke Huang,Dongqing Dai,Hongfei Yin,Wei Zhao,Yixin Jiang,Yahui Feng
The integration of heterogeneous photocatalysts has emerged as a promising approach to boost the effectiveness of photocatalytic reactions for hydrogen evolution. In this study, we explore the synergistic effects of Ti 3+ -TiO 2 /P-doped g-C 3 N 4 heterojunctions on the enhancement of visible light-induced hydrogen generation efficiency. The photocatalytic hydrogen evolution performance of the as-prepared TPCN100 (280.38 μmol g −1 h −1 ) surpasses that of pristine P-doped g-C 3 N 4 (34.89 μmol g −1 h −1 ) and Ti 3+ -TiO 2 (39.71 μmol g −1 h −1 ) by factors of 8.0 and 7.1 respectively. Through a comprehensive investigation of the structural, electronic, and photocatalytic properties, the underlying mechanisms accountable for the observed enhancement in efficiency within the heterojunction system were elucidated. Based on the in-situ X-ray photoelectron spectrometer (XPS) examination, measurement of band edge, and electron paramagnetic resonance (EPR) analysis, the S-scheme photocatalytic mechanism was proposed. The integration of Ti 3+ -TiO 2 and P-doped g-C 3 N 4 offers new insights into the design of advanced photocatalytic materials for sustainable energy applications.
研究领域:
材料科学
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能源化学
·
环境科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yunfang Ji,Wei Guo,Huihui Chen,Longshuai Zhang,Song Chen,Mutian Hua,Yuhan Long,Zhuo Chen
Constructing unique nanocomposites to facilitate charge transfer and promote catalytic activity provides a promising approach for enhancing solar-to-hydrogen efficiency. However, revealing the catalytic surface state and understanding their roles in the photocatalytic process remain elusive. Here, we develop a facile and mild solution method for ultrathin TiO2 nanosheets with a large specific surface area and enhanced surface Ti3+ accumulation. Moreover, we demonstrate a hybrid nanosystem composed of ultrathin 2D TiO2 nanosheets directly coupled with 0D CdSe QDs for hydrogen generation. The 0D CdSe QDs increase visible light absorption ability after being coupled with the TiO2 nanosheets. Owing to the synergistic effect between the quantum dots and nanosheets, the apparent quantum efficiency increases to 45% at 380 and 450 nm, and the H2 evolution exhibits a 10-fold enhancement. EPR results indicate that the surface Ti3+ greatly promotes H free radical production due to the redox couple Ti3+/Ti4+ providing an efficient route for the photoexcited electron–hole separation. Our findings provide new insights toward understanding and exploiting highly efficient photocatalyst.
研究领域:
材料科学
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能源化学
·
光催化
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jie Xu,Hongji Li,Huimin Feng,Yuqin Ma,Dandan Wang,Jianwei Zhu
The removal of refractory organic contaminants in the environment is vital, but developing highly active catalysts with a simple synthesis process remains a challenge. Herein, NH 2 -MIL-125(Ti) (Ti-MOF) as a template, Ti 3+ -TiO x clusters of different quantities were embedded in the CdIn 2 S 4 nanosheets to construct Ti 3+ -TiO x /CdIn 2 S 4 (TiCIS) heterojunction by an in-situ self-assembly strategy, which had a hollow structure, strong visible light absorption, high separation rate of carriers, and more active sites. During the degradation experiment of Rhodamine B (RhB), TiCIS25 exhibited the best photocatalytic performance, and 98.0% of RhB was degraded within 60 min of visible irradiation. The intermediates in the RhB degradation and their ecotoxicity were analyzed, which revealed that RhB degradation was a detoxification process. The radical trapping experiments and electron spin resonance (ESR) tests indicated that e - , 1 O 2 , and ·O 2 - are the main active species for RhB degradation. Moreover, a possible photocatalytic mechanism was proposed based on electrochemical tests. The photodegradation performance of the as-prepared TiCIS catalyst under different reaction parameters (authentic water matrices, initial pH, coexisting anions, organic matter concentration, actual sunlight, reaction temperature, and multiple pollutants) and circulating experiments, as well as the photo-reduction process CO 2 , reflected that TiCIS25 possessed excellent practicability, cyclic stability, and universal applicability. Above all, TiCIS25 exhibited great potential in photocatalytic processes, and the work provided a feasible strategy for designing high-performance photocatalysts .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）