CHEMPHYSCHEM
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2022
·Vol. 24
·期 7
·e202200505
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IF 3.52
Xujun Ma,Donghui Wang,Jianan Wu,Bin Zhao,Feng Chen
Graphical Fe 3+ doping was utilized to promote the formation of oxygen vacancies and improve the interaction between TiO 2 and atomic Pt. Single Pt atoms anchored on the oxygen vacancy sites of Fe−TiO 2 effectively modify the local energy band structure of TiO 2 , and thus significantly boost the catalytic performance of either the intrinsic or the sensitized photocatalytic process for Pt/Fe−TiO 2 . Single atomic site catalysts display the maximal atom-utilization efficiency, unique structural properties, and remarkable enhancements on catalytic activity. Herein, single Pt atoms loaded Fe−TiO 2 catalysts were prepared. Fe 3+ doping leads to the formation of oxygen vacancies and improve the interaction between TiO 2 and Pt. Single Pt atoms are thus anchored and effectively modify the local energy band structure of TiO 2 . The optimized local band structures improve the intrinsic photoexcitation of Pt/Fe−TiO 2 , promote the separation of photogenerated carriers, and extend the lifetime of photogenerated carriers. Meanwhile, the electrons transfer from the excited dyes to the conduction band edge of Pt/Fe−TiO 2 is also facilitated due to the shift-down of the conduction band edge. Therefore, with the increase of the Pt content (till up to 0.6 wt%), the photocatalytic performance of Pt/ Fe−TiO 2 with the confined single Pt atoms is significantly boosted in either the intrinsic or the sensitized photocatalytic process.
研究领域:
材料科学
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催化化学
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DOI
PubMed
高影响因子
International Journal of Nanomedicine
·
2018
·
IF 4.37
Wei Luo,Zhen Geng,Zhaoyang Li,Shuilin Wu,Zhenduo Cui,Shengli Zhu,Yanqin Liang,Xianjin Yang
Background Calcium sulphate cement (CSC) is widely used as an osteoconductive biomaterial in bone repair and regeneration.Purpose In this study, porous TiO2 microspheres were added to CSC to achieve a controlled and sustained drug (gentamicin) release.Methods Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and Brunauer-Emmett-Teller (BET) surface area analysis were conducted to analyse the morphology, phase composition, and surface area of the TiO2 micro-spheres and composite cements. In addition, the injection time, compressive strength, degradation behaviour, and antibacterial ability of the composite cements were examined during in vitro degradation. Gentamicin release profile was recorded using an ultraviolet spectrophotometer.Results The results revealed the excellent drug loading ability of the TiO2 microspheres. The addition of TiO2 microspheres improved the injectability and compressive strength of the composite cements, the maximum value of which was achieved at a TiO2 loading of 5 wt.%. When immersed in simulated body fluid (SBF), the composite cements doped with TiO2 microspheres were observed to release gentamicin in a stable and sustained manner, especially in the latter stages of in vitro degradation. During degradation, CSC doped with TiO2 microspheres exhibited a typical apatite-like behaviour. Further, antibacterial analysis showed that CSC doped with TiO2 microspheres exhibited long-term antibiotic activity.Conclusion Thus, as an effective sustained-release formulation material, TiO2 microspheres show a great potential for application in bone cements.
研究领域:
生物材料学
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药剂学
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骨科医学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Jiayi Li,Ying Huang,Minhua Su,Yuying Xie,Diyun Chen
Heterocyclic aromatic compounds such as malachite green can cause immense harm to the environment and mankind because of their toxic bio-accumulation and insufficient biodegradation. ZnFe 2 O 4 /TiO 2 (ZF-T) has attracted attentions as a visible-light-driven catalyst because it can break and mineralize benzene through photolysis. Compared with TiO 2 , which photodegrades only 53.5% malachite green, anatase TiO 2 loaded with ZnFe 2 O 4 has greater photocatalytic activity and can degrade up to 90.1% malachite green. Furthermore, a photocatalytic efficiency above 80% can be obtained through five consecutive cycles with a duration of 4 h. In this study, ZF-T was characterized, and its photolytic parameters, including dosage, pH, time, and ionic strength, were optimized. The photolytic products of malachite green were analyzed by ultraviolet–visible spectroscopy and liquid chromatography-mass spectrometry, which confirmed that ZF-T can drive visible light to produce •O 2 − and H + free radicals that can efficiently degrade heterocyclic aromatic hydrocarbons and cleave benzene rings. These outcomes deepen our understanding of the development and applications of visible-light-driven ZF-T composites in the field of wastewater purification.
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
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinwei Geng,Yongfeng Xia,Hanqin Liang,Dongxu Yao,Yu-Ping Zeng
Magnéli phases are an important class of transition metal oxides widely utilized in fields such as batteries, electrocatalysis , and photocatalysis . However, there are no reports on the use of Magnéli phases as additives in ceramic sintering. In order to explore the impact of the Magnéli phase as an additive on the sintering process, self-made Magnéli phase Ti 4 O 7 powder was added to the graded mixture of titanium dioxide (TiO 2 ) coarse powder and nanopowder , and sintered under atmospheric conditions in this study. The sintering characteristics, microstructure, and mechanical properties of TiO 2 ceramics with different content of Ti 4 O 7 were characterized. The results revealed that the addition of Ti 4 O 7 contributed to the reduction of the densification temperature of TiO 2 ceramics. Compared to the undoped sample, the addition of 1 wt% Ti 4 O 7 powder significantly improved the flexural strength and Vickers hardness of TiO 2 ceramics by 13.5% and 24.8%. According to the results of thermal analysis, UV–Vis–NIR, and XPS, the mechanism of Ti 4 O 7 in the sintering process of TiO 2 ceramics under atmospheric conditions was systematically discussed. This work not only obtained TiO 2 ceramics with improved performance but also showed the tremendous potential of Magnéli phases in the field of ceramic sintering.
研究领域:
材料科学
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陶瓷
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烧结技术
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机械工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yahui Zhou,Xiaohua Cheng,Zijian Duan,Xin Liu,Huiyu Yang,Bo Deng
Black TiO 2 microspheres photocatalysts with high light absorption intensity and photosensitive activity were prepared by a simple two-step method of flame-assisted combustion hydrolysis of tetrabutylorthotitanate (TBOT) and NaBH 4 reduction. The black TiO 2 microspheres photocatalysts were characterized by XRD, TEM, XPS, EELS , and UV-Vis absorption spectroscopy . The results show that the reduced TiO 2 exhibits a unique core-shell composite structure with a large number of oxygen vacancies and defects in the outer layer due to Ti 3+ , which effectively reduces the band gap of the photocatalyst. Compared with the commercial P25 catalyst, B-TiO 2 (1:7) showed higher removal of carbamazepine (CBZ) under visible light and its photocatalytic activity was 1.7 times higher than that of P25. This high photocatalytic activity is due to the efficient separation of electron-hole pairs, creating a greater number of active species. B-TiO 2 (1:7) maintained high activity after five repeated cycles and achieved 89.7 % removal of CBZ.
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
ACS Catalysis
·
2025
·
IF 13.1
Jinshi Dong,Ting Li,Shengtong Li,Panpan Chang,Qianqian Jin,Jiaqiang Yang,Zhuangzhuang Lai
CO and C3H8, as typical inorganic and organic gaseous pollutants, respectively, require distinct oxidation catalysts for efficient conversion due to their unique properties. In this work, Pt catalysts with different crystal phases of TiO2 (anatase and rutile) as supports were fabricated and investigated for CO oxidation and C3H8 combustion. The surface nature of TiO2 dramatically affects the local environment and electronic properties of supported Pt. Pt-TiO2(R) exhibited superior activity for CO oxidation, whereas Pt-TiO2(A) showed higher reactivity for C3H8 total oxidation. It is concluded that Pt-TiO2(R) contains more oxygen vacancies at the interfacial Pt perimeter sites than Pt-TiO2(A) after reduction pretreatments, which facilitates CO oxidation through the Mars–van Krevelen (MvK) mechanism. The electron-deficient Pt in Pt-TiO2(A) promotes the adsorption and activation of C3H8, and the amount of charge transfer between Pt and adsorbate intermediates during C3H8 oxidation determines the preference of C-C cleavage or dehydrogenation. Lower charge transfer in Pt-TiO2(A) makes C–C cleavage more efficient and contributes to the total oxidation of C3H8. This work emphasizes the importance of engineering material’s local environment and electronic structure to design high-performance oxidation catalysts.
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 9
·1-15
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IF 2.1
Yin Yanbing,Zhang Xueli,Jiang Bei,Wang Zhou,Feng Yongming,Li Xueying
Developing efficient catalysts for visible light reactions is vital in the field of photocatalysis. This study focuses on the synthesis of novel ternary composites (α-DMACoPc/TiO 2 /MIL-101 (Fe)) by leveraging the excellent adsorption properties of MIL-101 (Fe), the photosensitizing capabilities of phthalocyanine, and the photocatalytic potential of TiO 2 . The nanocomposites’ structural and optical attributes were thoroughly analyzed. X-ray powder diffraction (XRD) was utilized to showcase the crystalline nature of the composites. Furthermore, Fourier transform infrared (FT-IR) studies confirmed the formation of ternary nanocomposites. Optical absorption investigations demonstrated the tuning of the optical band gap from the UV to the visible range. The results indicated that nearly 94% of the organic material was decomposed after 150 min of exposure to simulated sunlight from a xenon lamp. This high efficiency can be attributed to the synergistic interaction among the composites, enhancing light absorption. The composite’s robust stability was evidenced through cyclic tests. Valuable information was provided to advance the design and synthesis of photocatalysts consisting of metal–organic frameworks synergized with semiconductors. Exploring the possibility of mesoporous materials was based on MOFs for photodegradation of organic pollutants. The photocatalytic degradation of organic pollutants by MOFs mesoporous materials was also investigated. The potential of composite materials in the field of dye degradation of industrial waste is confirmed. The good recycling photocatalytic reusability indicates the promising application of this photocatalyst. Graphical Abstract
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2025
·
IF 14.3
Martin C. Koo,Yu Zhang,Bo Cai,Chen-Ming Liang,Shao-Hang Shi,Hua-Long Peng,Shu-Hao Yang,Xiao-Bo Sun,Guang-Sheng Wang
Microwave-absorbing materials (MAMs) play an important role in reducing electromagnetic pollution. However, achieving a balance between low filler loading, low minimum reflection loss (RL min ) and wide effective absorption bandwidth (EAB) for efficient absorption of microwaves remains challenging. In this work, an innovative method of using CO 2 atmosphere annealed Ti 3 C 2 T x MXene (C/TiO 2 ) combined with nickel nanowires (NiNW) via ultrasonic treatment was performed to yield C/TiO 2 /NiNW (CTN) composites with abundant NiNW/TiO 2 contacts. The electromagnetic (EM) parameters of the as-synthesized composites were closely studied through a series of experiments and computed theoretical calculations. Through the establishment of built-in electric fields (BIEFs) at the NiNW/TiO 2 interface, the derived CTN composite demonstrated improved dielectric properties and impedance matching characteristics that are clearly reflected on the microwave absorption performance of our as-synthesized MAMs, with RL min improving by 127.9% from −31.93 dB to −72.77 dB, and widest EAB increasing by 25.9% from 4.25 GHz to 5.35 GHz, at a low filler loading of 10 wt.%. This work investigates the mechanisms by which BIEFs influence EM parameters, providing critical insights into improving microwave absorption performance via BIEF structural design.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2016
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IF 7.476
Zhenfei Gao,Liqiang Zhang,Chi Ma,Qidong Zhou,Yushu Tang,Zhiqiang Tu,Wang Yang,Lishan Cui,Yongfeng Li
TiO 2 modified Co 3 O 4 acicular nanotube arrays (ANTAs) have been fabricated in this study, showing a good performance in glucose detection. In the experiment, the precursor Co(CO 3 ) 0.5 (OH)·0.11H 2 O acicular nanowire arrays (ANWAs) was first grown on the fluorine doped tin oxide (FTO) substrate by a hydrothermal method . Thereafter, the uniform pink precursor Co(CO 3 ) 0.5 (OH)·0.11H 2 O ANWAs was completely converted to the black Co 3 O 4 ANTAs thin film by alkaline treatment . After the decoration of TiO 2 , the TiO 2 /Co 3 O 4 ANTAs electrode exhibits a much higher current response to glucose compared with the Co 3 O 4 ANTAs. Importantly, this neotype composite structure of Co 3 O 4 enhances the glucose sensing performance by increasing specific surface area, additional reactive sites and synergistic effect , which make the TiO 2 /Co 3 O 4 glucose sensor show a high sensitivity of 2008.82 μA mM −1 cm −2 , a fast response time (less than 5 s) and a detection limit as low as 0.3396 μM (S/N=3). The TiO 2 /Co 3 O 4 ANTAs modified electrode exhibits a high selectivity for glucose in human serum, against ascorbic acid and uric acid .
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Dongxing Tan,Jianling Zhang,Jinbiao Shi,Shaopeng Li,Bingxing Zhang,Xiuniang Tan,Fanyu Zhang,Lifei Liu,Dan Shao,Buxing Han
To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO2 conversion to CH4 under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO2 nanosheet for CO2 conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti3+ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO2 reduction. It was found that CO2 could be efficiently transformed to CH4 under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH4 can reach 79.0 μmol g–1 h–1. Moreover, the Ag/Pd bimetals supported on N-doped TiO2 nanosheet exhibit high selectivity to CH4. The as-synthesized photocatalyst can be well recycled for CO2 reduction.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·149-164
·
IF 2.064
Sun Jialin,Dai Jingtao,Liu Rui,Yang Xiaowei,Chen Jian
To improve the visible-light catalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal reduction method. Imidacloprid (IMI) was employed as the target pollutant to evaluate the critical impacts on the catalytic activity of as-prepared Ag/AgBr/TiO 2 , where the factors relating to the catalyst (composition, dosage, recycle and reuse) and solution chemistry (pH and concentration, simulated wastewater samples and floodwater of rice paddy field) were studied. The results suggested that benefitting from visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits superior visible-light photocatalytic activity and stability to Ag/AgBr and TiO 2 . The quenching tests with various scavengers indicate that · O 2 − and h + , and · O 2 − and · OH may be the key roles in IMI photo-degradation on Ag/AgBr and on Ag/AgBr/TiO 2 , respectively. Thus, the photocatalytic performance of Ag/AgBr/TiO 2 differs from that of Ag/AgBr. Furthermore, the contribution of such active species is clarified for quantitative mechanisms study. The photo-degradation conducted in the simulated wastewater and the floodwater of rice paddy field proves favorable anti-interference capacity of Ag/AgBr/TiO 2 . The tests conducted on real wastewater sample verified that Ag/AgBr/TiO 2 can mineralize IMI promptly and almost completely.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Jianxin Liu,Fangxia Xie,Rui Li,Tan Li,Zehui Jia,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
A novel TiO 2-x /Ag 3 PO 4 composite photocatalyst with controllable oxygen vacancies (V o ·) amount was designedly prepared to avoid the photocorrosion and promote reduction capacity of Ag 3 PO 4 photocatalyst. The V o · on TiO 2-x work as molecular oxygen activation center trapping electron and O 2 to form ·O 2 - , and then avoided the electrons combine with h + and/or Ag + . Compared with Ag 3 PO 4 , TiO 2-x , and TiO 2 /Ag 3 PO 4 , TiO 2-x /Ag 3 PO 4 showed obviously efficient visible light and natural indoor weak light photocatalytic activity and stability for the photodegradation of Bisphenol A (BPA). The photoelectric conversion spectra, Ag 3d XPS narrow scan spectra, ESR DMPO-·O 2 - species spectra revealed that the TiO 2-x /Ag 3 PO 4 had a higher photocurrent density, lower photocorrosion and more generation of superoxide radical than those of Ag 3 PO 4 . Interestingly, compare with single h + degradation pathway over Ag 3 PO 4 , the h + and ·O 2 - synergistic degradation pathway over TiO 2-x /Ag 3 PO 4 is more beneficial to the BPA degradation. This work highlights the relations between the photocatalyst structure, active species and pollutant degradation pathway.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）