Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 8
·2042-2053
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IF 6.331
Xiaolu Guo,Changchun Wen,Qianxin Xu,Changping Ruan,Xing-Can Shen,Hong Liang
The second near-infrared (NIR-II) window (1000–1350 nm) usually offers further improved light penetration, a higher maximum permissible exposure (MPE), and a lower background signal. Development of NIR-II optical diagnosis and phototherapy technologies is of great significance for precise, efficient tumor therapy. In this work, a new type of Ti-based targeting agent (B-TiO2@SiO2–HA) nanotheranostic system with strong NIR-II absorption was designed and fabricated for the first time. Oxygen vacancies were formed in B-TiO2 and its band gap was narrowed, resulting in nanotheranostic systems with full-spectrum responses to stimulation with light. The experimental results showed that B-TiO2@SiO2–HA not only can enable high NIR-II photothermal conversion and provide excellent reactive oxygen species (ROS) production capacity, but also can enable high-resolution photoacoustic imaging (PAI) under NIR-II laser irradiation. Moreover, HA modification gives the nanotheranostic systems the useful ability to target high-CD44-expression tumor cells and tissues. In vitro and in vivo experiments demonstrated that B-TiO2@SiO2–HA exhibited a targeted photothermal/photodynamic (PTT/PDT) effect that produced tumor-cell ablation and apoptosis under the guidance of real-time NIR-II PA imaging. B-TiO2@SiO2–HA exhibits precise nanotheranostic potential for PAI-guided tumor-targeting phototherapy.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xilin Liao,Ting-Ting Li,Hai-Tao Ren,Zhiyong Mao,Xuefei Zhang,Jia-Horng Lin,Ching-Wen Lou
A BiFeO 3 /TiO 2 p-n heterojunction photocatalyst with ferroelectric synergistic effect under visible-light irradiation was developed through facile hydrolysis and precipitation by forming nanospheres of TiO 2 on BiFeO 3 nanocube to improve the photocatalytic efficiency. Analyses of the microstructure, optical properties , and photoelectrochemical performance indicate the formation of a core–shell heterostructure of BiFeO 3 /TiO 2 with excellent energy band matching. The BiFeO 3 /TiO 2 p-n heterojunction has enlarged specific surface area, higher sensitivity to visible-light, and improved separation and transfer efficiency of photoelectron-hole pairs than single TiO 2 and BiFeO 3 . Moreover, the composite exhibits superior photocatalytic degradation performance for methylene blue (MB) and common antibiotic tetracycline (TC) under UV and visible-light irradiation. The MB degradation rate within 180 min reaches 78.4% and 90.4% under UV and visible-light irradiation, respectively. Furthermore, the enhanced photocatalytic mechanism of BiFeO 3 /TiO 2 is explored by photoluminescence (PL), electrochemical impedance spectroscopy (EIS), transient photocurrent analysis, radical quenching, and band structure characterization.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yan Sun,Lu Xu,Pengkang Jin,Xue Bai,Xin Jin,Xuan Shi
It is well known that pristine titanium dioxide (TiO 2 ) is unable to absorb and utilize visible light to degrade organics and reduce hexavalent chromium (Cr(VI)). However, for the first time, this research found that when some organic compounds were mixed with hexavalent chromium, titanium dioxide could not only degrade organic compounds but also reduce hexavalent chromium synchronously under the drive of visible light. The pristine TiO 2 exhibited excellent simultaneity removal of bisphenol A (BPA) and Cr(VI) under visible light irradiation, and almost 100% BPA (50 mg/L) and 100% Cr(VI) (10 mg/L) were removed just within 60 min. Photoluminescence (PL), electrochemical characterization and chemical quenching studies suggested that the reaction mechanism is similar to dye sensitization and electron transfer is responsible for the superior recation. Influences of different reaction conditions were systematically investigated, such as the initial concentration of BPA, the crystal structure of TiO 2 , the catalyst dosage, the initial pH value, and the common inorganic anions. Compared to the rutile, anatase exhibited the most remarkable performance for BPA degradation and Cr(VI) reduction under visible light irradiation. In addition, many other typical refractory organics, such as acetaminophen and tetracycline, have been successfully applied in this photocatalytic system of TiO 2 under visible light irradiation (TiO 2 /Vis system) to synergistically remove self-contamination and Cr (VI) pollution. The findings of the present study provide a valuable insight for sewage treatment, especially the composite wastewater containing organic pollutants and the hexavalent chromium.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yongshan Xu,Lingli Zheng,Chen Yang,Wei Zheng,Xianghong Liu,Jun Zhang
Constructing heterostructures with efficient modulation of electron transfer at the heterointerface affords great opportunity for electronic devices. Herein, a high performance nanosensor based on core-shell ZnO@TiO 2 nanorods is successfully realized for n-butanol detection. The n-n heterointerface formed between TiO 2 and ZnO allows for vast variation of conductivity due to electron confinement induced by their different works functions and enhances the response on exposure to gaseous molecules. Studies reveals that the shell thickness of TiO 2 has a great impact on the sensor performances, and the sensor based on ZnO@TiO 2 nanorods with 6.4 nm-thick TiO 2 shell delivers outstanding gas sensing properties in terms of high sensitivity, low detection limit (133 ppb), fast response-recovery, and excellent selectivity towards n-butanol detection. The mechanism for the improved gas sensing function is ascribed to the heterojunctions of core-shell nanostructure, the enhanced oxygen adsorption due to the TiO 2 shell and the fully electron-depleted TiO 2 shell layer with a thickness comparable to the Debye length. The strategy presented here is generally applicable and can provide some hints to design efficient electronic sensors with optimized performances.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xianwei Geng,Ruowei Yi,Xiangfei Lin,Chenguang Liu,Yi Sun,Yingchao Zhao,Yinqing Li,Ivona Mitrovic,Rui Liu,Li Yang,Cezhou Zhao
Lithium-sulfur (Li–S) batteries have attracted more and more attention in recent years, as their theoretical capacity is several times larger than conventional lithium-ion batteries and they have a high energy density in secondary battery systems. In our work, a titanium carbide - titanium dioxide/single-walled carbon nanotube/sulfur (TiC–TiO 2 /SWCNT/S) cathode with high conductivity and effective polysulfides adsorption is prepared by a facile method for fabricating Li–S batteries. The batteries with this composite cathode show a good performance at 0.1 C due to relatively high utilization of sulfur, reaching 1338.6 mAh·g −1 specific capacity at first cycle and retaining 802.5 mAh·g −1 after 100 cycles. Meanwhile, it presents an excellent rate performance with 711.2 mAh·g −1 at 4 C, and recovers to 1006.9 mAh·g −1 when the current returns to 0.1 C. Also a slow capacity decay (0.045% decay rate per cycle) is observed at 1 C. These results suggest that a small amount of SWCNT can increase the conductivity of the whole composite to a great extent, and the strong adsorption ability of TiO 2 increases the cycle life. This work offers an efficient and low-cost strategy to obtain high performance batteries with great potential for commercial applications.
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ACS Applied Nano Materials
·
2020
·
IF 0
Yuan Wang,Yan Zhang,Tian C. Zhang,Gang Xiang,Xinlong Wang,Shaojun Yuan
Efficient removal of trace arsenites [As(III)] in groundwater is a big challenge worldwide. In this study, magnetic Fe3O4@poly(p-phenylenediamine)@TiO2 (Fe3O4@PpPDA@TiO2) core–shell nanoparticles were synthesized for As(III) ions removal via the photocatalytic oxidation–adsorption process. Under dark conditions, the As(III) adsorption on the as-synthesized core–shell nanoparticles obeyed the pseudo-second-order kinetic model and reached adsorption equilibrium within 45 min with a removal efficiency of 36.5%. Under visible-light irradiation, approximately 92% of As(III) ions were transformed into relatively low-toxic As(V) ions via the Fe3O4@PpPDA@TiO2 core–shell nanoparticles, and the arsenic removal efficiency increased dramatically to about 81% owing to As(V) ions being simultaneously adsorbed on the nanocomposite surfaces. The photocatalytic oxidation mechanisms were attributed to the synergism of photogenerated holes, hydroxyl radicals, and superoxide radicals. The as-synthesized Fe3O4@PpPDA@TiO2 core–shell nanoparticles are potentially useful in purifying the trace As(III)-contaminated groundwater owing to their easy magnetic separation, high optical quantum efficiency, and visible-light photocatalytic activity.
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Catalysts
·
2020
·Vol. 10
·期 5
·539
·
IF 3.52
Lan Luo,Tingting Zhang,Xin Zhang,Rongping Yun,Yanjun Lin,Bing Zhang,Xu Xiang
Hydrogen production by photoreforming of biomass-derived ethanol is a renewable way of obtaining clean fuel. We developed a site-specific deposition strategy to construct supported Au catalysts by rationally constructing Ti3+defects inTiO2nanorods and Cu2O-TiO2p-n junction across the interface of two components. The Au nanoparticles (~2.5 nm) were selectively anchored onto either TiO2nanorods (Au@TiO2/Cu2O) or Cu2O nanocubes (Au@Cu2O/TiO2) or both TiO2and Cu2O (Au@TiO2/Cu2O@Au) with the same Au loading. The electronic structure of supported Au species was changed by forming Au@TiO2interface due to the adjacent Ti3+defects and the associated oxygen vacancies while unchanged in Au@Cu2O/TiO2catalyst. The p-n junction of TiO2/Cu2O promoted charge separation and transfer across the junction. During ethanol photoreforming, Au@TiO2/Cu2O catalyst possessing both the Au@TiO2interface and the p-n junction showed the highest H2production rate of 8548 μmol gcat−1h−1under simulated solar light, apparently superior to both Au@TiO2and Au@Cu2O/TiO2catalyst. The acetaldehyde was produced in liquid phase at an almost stoichiometric rate, and C−C cleavage of ethanol molecules to form CH4or CO2was greatly inhibited. Extensive spectroscopic results support the claim that Au adjacent to surface Ti3+defects could be active sites for H2production and p-n junction of TiO2/Cu2O facilitates photo-generated charge transfer and further dehydrogenation of ethanol to acetaldehyde during the photoreforming.Keywords:ethanol reforming;hydrogen production;Au catalyst;Ti3+defect;site-specific deposition
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhuang Wang,Asad Mahmood,Xiaofeng Xie,Xiao Wang,Hanxun Qiu,Jing Sun
For the oxide-based photocatalysts, polyoxylic acid modification can affect their adsorption/desorption properties and further regulate photocatalytic reaction pathway, which is crucial for enhancing photocatalytic activity and selectivity. Herein, phosphoric acid modified TiO 2 was synthesized by a facile impregnation-calcination method for photocatalytic degradation of gaseous o-xylene. According to FTIR, XPS, and EDS analysis, phosphoric acid was anchored on the surface of TiO 2 successfully. The surface P atomic percentages for PT1 was 2.45%. The as-prepared phosphoric acid modified TiO 2 (PTx) had a photocatalytic performance superior to that of commercial TiO 2 and unmodified TiO 2 (PT0), with increasing by 2.2 times at most. Interestingly, the phosphoric acid molecules strongly adsorbed on anatase TiO 2 surface by forming H–O 2C and =O–Ti 5C chemical bonds according to the first principle calculations, which changed TiO 2 surface properties (specific surface area and surface negative electrostatic field) and further improved adsorption and charge carrier separation and transfer, thus improving the photocatalytic activity. Additionally, according to the intermediates results, the relative abundance of intermediates shows obvious difference. Acetone was detected as the most abundant intermediates during o-xylene degradation for PT0, whereas that was o-methyl benzaldehyde for PT1, which could be ascribed to the difference of surface adsorption configuration of o-xylene. According to the temperature-programmed desorption (TPD) results, the surface modified by phosphoric acid could change the o-xylene adsorption configuration to favor its methyl oxidation (standing configuration), whereas the unmodified surface could be more favorable to the benzene ring-open reaction (lying configuration). This work will deepen the understanding of the relevance of surface modification and surface photocatalytic reaction, which also provides a feasible strategy to improve photocatalytic selectivity.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qiong Sun,Songhao Wu,Kaijing Li,Bing Han,Yingjie Chen,Beili Pang,Liyan Yu,Lifeng Dong
The improved photocatalytic activity of TiO 2 with the addition of spinel CoFe 2 O 4 as an effective catalyst for O 2 reduction reaction (ORR) is studied and proved in this study. CoFe 2 O 4 -TiO 2 heterostructure nanoparticles are prepared by a reflux condensation and two-step hydrolysis-hydrothermal method. The addition of trace CoFe 2 O 4 onto TiO 2 can improve its affinity to O 2 , generate a faster transportation of photo-induced carriers, but hardly affect band structure. With an appropriate amount of CoFe 2 O 4 to TiO 2 , a remarkable acceleration occurs in photocatalytic decolorization of dye wastewater, and the calculated apparent kinetic constant ( k app ) of the composite (0.020 min −1 ) is 2.4 and 5.6 times of pure TiO 2 (0.0085 min −1 ) and CoFe 2 O 4 (0.0036 min −1 ), respectively. Quenching experiments with different radical scavengers show that O 2 –∙ is the key oxidative radical in all photocatalytical reactions. Meanwhile, the rapid growth of O 2 –∙ production by CoFe 2 O 4 -TiO 2 is proved to be a major cause for photocatalytic performance improvement. Furthermore, an improved electrochemical ORR catalytic ability by CoFe 2 O 4 -TiO 2 is verified and the 2-plus-2 electron route generates the same product (H 2 O 2 ) as the photocatalytic process. Therefore, the synergistic operation of photocatalytic and catalytic ORR process by CoFe 2 O 4 -TiO 2 resulted in a rapid degradation of dye wastewater.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 4
·1161-1170
·
IF 5.721
Huiyu Yang,Lisha Zhai,Ke Li,Xin Liu,Bo Deng,Weilin Xu
A nano-graphite-doped TiO2 composite, C-TiO2, was fabricated by atomic layer deposition (ALD) of TiO2 onto carbon fiber fabrics (CFFs), followed by calcination. The morphology and structure of the C-TiO2 composite were characterized by various techniques. The photocatalytic activity of C-TiO2 was compared with that of commercial P25. Results revealed that the nano-graphite/TiO2 “islands” with diameters of ∼5.5 nm were uniformly embedded inside the graphite “sea”. Nano-graphite sheets closely contacted with TiO2, which formed Ti–O–C bonds between nano-graphite and TiO2. The as-prepared C-TiO2 showed 2.1-fold higher photocatalytic activity than that of P25 and the reported C-TiO2 composite under visible light. C-TiO2 could effectively degrade MB at a removal rate of up to 93.1% even after 6 cycles of repeated usage.
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RSC Advances
·
2020
·Vol. 10
·期 2
·1181-1190
·
IF 3.119
Weidong Peng,Chun Yang,Jiang Yu
A facile and feasible method was successfully utilized to incorporate Bi2O3 and g-C3N4 quantum dots on TiO2 surface to synthesize a novel composite g-C3N4/TiO2/Bi2O3. The photocatalytic activity of the composite g-C3N4/TiO2/Bi2O3 for degradation of dyes under sunlight and UV light irradiation was evaluated. It possessed the higher photocatalytic performance than that of pristine TiO2 or g-C3N4 under the same conditions. Under sunlight irradiation, the reaction rate constants of the g-C3N4/TiO2/Bi2O3 was about 4.2 times and 3.3 times higher than that of TiO2 and g-C3N4, respectively. The promising photocatalytic performance was attributed to the broader light absorption range and efficient separation of photoinduced carriers. Moreover, based on the TEM, XPS, XRD, UV-vis spectrum, radicals scavenging test and Mott–Schottky analysis systematic mechanism for photodegradation process was proposed. This work provides a promising strategy for the modification of TiO2-based semiconductors by incorporating different quantum dots and promoting the efficiency of the photocatalysts in practical application.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jingjing Xu,Wenting Li,Zhenhao Cao,Yapei Jiao,Xue Li
In this work, a poly(ethylene glycol)-b-poly(1H,1H,7H-dodecafluoroheptyl methacrylate) (PEG- b -PDFMA) block copolymer was first synthesized by the reversible addition−fragmentation chain transfer (RAFT) polymerization. Then a novel facile approach was developed to fabricate oval cuboid TiO 2 particles with mesoporous structure by using the PEG- b -PDFMA block copolymer as a template and titanium tetrabutoxide (TBOT) as a precursor, followed by evaporation-induced self-assembly (EISA) process and calcination process. The results show that the PEG- b -PDFMA block copolymer can control the oriented assembly of nanoparticles and act as templates for the formation of a mesopore. It is found that the mass ratio of TBOT/PEG- b -PDFMA and water content in the solution have a significant influence on the morphology of TiO 2 particles. When the mass ratio of TBOT/PEG- b -PDFMA is 0.25/1, oval cuboid TiO 2 particles with mesopores are obtained, which exhibits a high photocatalytic activity for the degradation of methylene blue (MB) dye under UV light irradiation.
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