ACS Applied Nano Materials
·
2022
·
IF 6.14
Chuanqi Pan,Huan Shen,Guoli Liu,Xiang Zhang,Xiaoxuan Liu,Huifeng Liu,Peiyan Xu,Wei Chen,Yuan Tian,Hongtao Deng,Hongwei Sun,Jinlong Wang,Zhu Luo,Lizhi Zhang,Yanbing Guo
Bacterial infection can induce a variety of deadly diseases that seriously threaten human life and health. TiO2 is extensively employed as a broad-spectrum antibacterial photocatalytic material for the inactivation of bacteria. However, a wide-band-gap nature has limited the effectiveness of TiO2 to only the UV-light range. In addition, photogenerated electrons and holes can recombine quickly, inducing low antibacterial efficiency. Here, we fabricated a CuO/TiO2 nanobelt by an impregnation method and introduced surface oxygen vacancies (Ov) to significantly improve their photocatalytic inactivation performance against Staphylococcus aureus. The CuO/TiO2–H2 catalyst contains more Ov and exhibits excellent antibacterial properties against S. aureus. The antibacterial efficiency is 32.2 and 99.4 times those of CuO/TiO2 and bare TiO2, respectively, under light irradiation. The photogenerated electron–hole pairs react with molecular oxygen (O2) and a surface hydroxyl group or water (OH– or H2O), resulting in the formation of an active hydroxyl radical (·OH) and a superoxide radical anion (·O2–). In addition, the surface Ov can effectively reduce the conduction band and act as an electron capture center, thereby promoting the adsorption and activation of O2 and generating more active ·O2– species. This work indicates the efficient antibacterial activity of a CuO/TiO2 nanobelt with Ov and provides a feasible approach for the development of highly efficient antibacterial nanomaterials in the medical field.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2023
·
IF 1.1
XINRU WANG,XUAN WANG,HAO DING,RUIXIN MA,YU TU,WEI LI
The goal of this paper is to improve the technical level of preparing composite photocatalysts with SiO 2 -supported nano-TiO 2 , expand the selection range of SiO 2 carriers, reduce expenses and understand the influence of SiO 2 crystallization behavior. Natural quartz (Q/SiO 2 ) powder was used as a carrier to prepare a Q/SiO 2 -TiO 2 composite photocatalyst by hydrolyzing a butyl titanate solution and performing high-temperature calcination of the hydrolysate. The performance, morphology, structure and mechanism were tested and characterized. In addition, the as-prepared photocatalyst was compared with other amorphous SiO 2 carrier composite photocatalysts. The results showed that the Q/SiO 2 surface of Q/SiO 2 -TiO 2 contained a uniform load of TiO 2 with a 26.98% proportion. Anatase-type TiO 2 was mainly present, and the size was 5–10 nm. Moreover, Q/SiO 2 and TiO 2 were firmly combined in the form of Si–O–Ti bonds between the interfaces. The degradation rate of Q/SiO 2 -TiO 2 to methyl orange solution was 99.59% under UV irradiation for 60 min, which was equivalent to that of pure nano-TiO 2 . The degradation performance remained stable after four cycles. Compared with other amorphous SiO 2 carriers, Q/SiO 2 exhibited a higher load of TiO 2 . Furthermore, Q/SiO 2 played a more significant role in inhibiting the phase transition of TiO 2 to rutile and improving the photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yaxiong Tian,Fangzhou Lu,Yun Wang,Ting Sun,Yuanli Liu
Heterogeneous materials combine the advantage of each component through the synergy effect to become promising electrode materials for lithium-ion batteries (LIBs). Designing heterojunctions with specific structures can better show their electrochemical performance. In this work, we fabricated VS 2 nanosheets perpendicular to the C/TiO 2 nanotube (VS 2 @C/TiO 2 ) composite with a “branch-leaf” structure by an electrospinning-carbonization-solvothermal method. Notably, the interior of the C/TiO 2 nanotube consists of small-sized TiO 2 nanoparticles , which guarantees high electrochemical reactivity. The presence of carbon not only accelerates charge transfer across the interface of carbon-TiO 2 but also serves as an anchor for the growth of VS 2 nanosheet by C S V bonding, thus enhancing the structural stability of the electrode. As anode for LIBs, the VS 2 @C/TiO 2 electrode exhibits a high reversible capacity of 748 mAh g −1 and 324.2 mAh g −1 at 100 mA g −1 and 1 A g −1 , respectively. This work highlights the unique “branch-leaf” design of VS 2 @C/TiO 2 , which offers a new prospect for developing high-performance heterogeneous electrodes for LIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
R. Lu,S.-Z. Zhao,Y. Yang,Y. Wang,H.-L. Huang,Y.-D. Hu,R.D. Rodriguez,J.-J. Chen
TiO 2 nanotubes decorated with Bi 2 O 3 /Bi 2 O 2.33 nanosheets were prepared through a facile avenue that combines sacrifice template and hydrothermal methods . The TiO 2 nanotube structure provided a large specific surface area, and the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterojunction broadened the light absorption range by reducing the bandgap to 2.746 eV. The TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure demonstrated high adsorption capability for methyl orange (100 mg/L) with a 70% adsorption rate after 60 min. The photocatalytic performance of the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure was evaluated through the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TCH). The removal rates of RhB (10 mg/L) and high concentration TCH (50 mg/L) could reach 93% and 96% after 60 min and 120 min of light irradiation, respectively. Theoretical calculations showed that the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) structure enhanced photogenerated charge separation, leading to improved degradation of organic pollutants. This study provides a facile way for designing and creating heterostructural nanotubes with enhanced performance for removing organic pollutants.
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
Nano Energy
·
2018
·
IF 13.12
Yi Lu,Xiu Cheng,Ge Tian,Heng Zhao,Li He,Jie Hu,Si-Ming Wu,Ying Dong,Gang-Gang Chang,Silvia Lenaerts,Stéphane Siffert,Gustaaf Van Tendeloo,Zhao-Fei Li,Ling-Ling Xu,Xiao-Yu Yang,Bao-Lian Su
Hierarchical semiconductors are the most important photocatalysts , especially for visible light-induced hydrogen production from water splitting. We demonstrate herein a hierarchical electrostatic assembly approach to hierarchical CdS/m-TiO 2 /G ternary photocatalyst, which exhibits high photoactivity and excellent photostability (more than twice the activity of pure CdS while 82% of initial photoactivity remained after 15 recycles during 80 h irradiation). The ternary nanojunction effect of the photocatalyst has been investigated from orbitals hybrid, bonding energy to atom-stress distortion and nano-interface fusion. And a coherent separation mechanism of charge carriers in the ternary system has been proposed at an atomic/nanoscale. This work offers a promising way to inhibit the photocorrosion of CdS and, more importantly, provide new insights for the design of ternary nanostructured photocatalysts with an ideal heterojunction .
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 18
·22910-22920
·
IF 2.478
Zhao Yuan,Zhang Mengqi,Wang Wei,Song Wenli,Jiang Kanrui,Zhang Xiaojuan
Ti 3+ /N-co-doped TiO 2 was successfully synthesized in situ by one-step hydrothermal method using tetrabutyl titanate (TBOT) as the titanium source and hydrazine hydrate as the reducing agent and nitrogen source. Afterward, the microstructure and physicochemical properties of the catalysts were characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Results indicated that nitrogen was effectively doped into the lattice of TiO 2 and Ti 3+ was stably presented in the prepared TiO 2 , which reduced the band-gap TiO 2 (2.96–2.75 eV) and enhanced photo-induced charge separation efficiency under visible light. In addition, the photocatalytic activity was evaluated by degradation of rhodamine B under xenon lamp with 420 nm filter. With the amount of hydrazine hydrate increased, the photocatalytic degradation performance of the sample increased first and then decreased. When the volume ratio of hydrazine hydrate to TBOT was 1:5, the sample showed the best photocatalytic performance.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Haihong Wang,Huiyan Ma,Yan Li,Lin Cheng,Jucai Yang,Juming Liu
Efficient, low-cost, and easily scalable wide-spectral-responsive TiO2 photocatalysts are still extremely desired in driving photocatalytic degradation toward practical applications. In this work, a modified TiO2 with a narrow band gap and low valence band (VB) (CC-OV-TiO2) was successfully synthesized based on a facile sol–gel and low-temperature carbonization process, which can be used for the photocatalytic degradation and mineralization of a wide range of phenols. The results show that the interstitial doping of carbonates and the modification of surface oxygen vacancy (OV) defects together contribute to the formation of the VB tail states, which substantially narrow the band gap of TiO2 and widen the photoresponse range. Meanwhile, the carboxylated carbon species induce a substantial downward shift of the VB edge through coordination of the electron-withdrawing carboxyl groups, which further enhances the oxidation ability of the photogenerated holes. Accordingly, CC-OV-TiO2 with a narrow band gap and low VB exhibits superior and stable photocatalytic performance.
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
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 16
·
IF 3.1
Du Luchao,An Jie,Katayama Tetsuro,Duan Menghan,Shi XiaoPing,Wang Yunpeng,Furube Akihiro
In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr 3 /TiO 2 composite systems with different Mn 2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn 2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn 2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn 2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn 2+ doping on the interface charge transfer process of the CsPbBr 3 /TiO 2 solar cell system.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Lina Lin,Xiaoyu Feng,Dengpeng Lan,Yuang Chen,Qilan Zhong,Chao Liu,Yan Cheng,Ruijuan Qi,Jianping Ge,Chengzhong Yu,Chun-gang Duan,Rong Huang
Interface structure plays an extremely important role in the charge-transfer and photocatalytic performances in plasmonic metal/semiconductor systems. Defect engineering by introducing an oxygen vacancy (Ovac) is an effective way to modulate the interface structure. Here, a representative photocatalyst system including TiO2, TiO2–x, Au-TiO2 and Au-TiO2–x as designed delicately to reveal the detailed mechanism of the plasmon-resonance-induced charge separation in interfacial defect structure from the nanoscale. The local charge transfer via a conducting amorphous-like interface layer is visualized as the arched valence change from Ti3+ to Ti4+ at the Au-TiO2–x interface after Schottky contact. This phenomenon eventually leads to the enhancement of localized surface plasmon resonance (LSPR) at 2.3 eV, and the introduction of Ovac reduces the Schottky barrier height of Au-TiO2–x by 5 mV compared with that of Au-TiO2. Under visible light, Au-TiO2–x excites the most photogenerated carriers to the surface, which is larger than that of TiO2–x and Au-TiO2. It can be concluded that the changes in electronic structure eventually promote charge transfer in visible light and explain the original reason that the coupling of Ovac and Au could improve the photocatalytic performance.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Feifei Wang,Xiaolin Yu,Maofa Ge,Sujun Wu
A series of TiO 2 and γ-Fe 2 O 3 co-doped graphene oxide (GO) nanosheets ( x TiO 2 /γ-Fe 2 O 3 /GO) were prepared by a facile self-assembly method. The characterization results show that the x TiO 2 /γ-Fe 2 O 3 /GO have the advantages of narrow band gap energies (<2.47 eV), and high structure stability. The incorporation of TiO 2 into γ-Fe 2 O 3 /GO composite dramatically enhances the catalytic activity, and the 0.03TiO 2 /γ-Fe 2 O 3 /GO composite exhibits the highest catalytic efficiency (99%) for ciprofloxacin (CIP) degradation (10 mg/L, 50 ml) within 140 min under visible light, which is ~1.5 times higher than that of γ-Fe 2 O 3 /GO composite without TiO 2 . Furthermore, the photo-Fenton like mechanism was proposed by quenching experiment and electrochemistry method. The intermediates of the CIP degradation were analyzed by the assistance of LC-MS technology, which provides insight into the pathway of CIP degradation.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 63
·36907-36914
·
IF 3.049
Xiongrui Jiang,Zhiyao Yan,Jing Zhang,Junzheng Gao,Wanxia Huang,Qiwu Shi,Hengzhong Zhang
Black TiO2 has received tremendous attention because of its lattice disorder-induced reduction in the TiO2 bandgap, which yields excellent light absorption and photocatalytic ability. In this report, a highly efficient visible-light-driven black TiO2 photocatalyst was synthesized with a mesoporous hollow shell structure. It provided a higher specific surface area, more reaction sites and enhanced visible light absorption capability, which significantly promoted the photocatalytic reaction. Subsequently, the mesoporous hollow black TiO2 with different lattice disorder-engineering degrees were designed. The structure disorder in the black TiO2 obviously increased with reduction temperature, leading to improved visible light absorption. However, their visible-light-driven photocatalytic efficiency increased first and then decreased. The highest value can be observed for the sample reduced at 350 °C, which was 2-, 1.4- and 5-fold that of the samples reduced at 320 °C, 380 °C and 400 °C, respectively. This contradiction can be ascribed to the varied functions of the surface defects with different concentrations in the black TiO2 during the catalytic process. In particular, the defects at low concentrations boost photocatalysis but reverse photocatalysis at high concentrations when they act as charge recombination centers. This study provides significant insight for the fabrication of high-efficiency visible-light-driven catalytic black TiO2 and the understanding of its catalysis mechanism.
研究领域:
材料科学
·
光催化技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2017
·
IF 4.52
Haoran Li,Yurong He,Ziyu Liu,Baocheng Jiang,Yimin Huang
Harvesting solar energy for steam generation has been widely applied in processes, such as sterilization, water purification , sea water desalination , and electricity generation . It has been found that a nanoparticle-modified membrane (NPM) can directly convert incoming solar energy into thermal energy in a short time period. In this work, broadband core–shell Ag@TiO 2 nanoparticles (NPs) having significant larger absorbance were synthesized. Flexible membranes using the deposition of the synthesized NPs were fabricated and floated on the surface of water to enhance the water evaporation. The effects of the density of deposited NPs and the solar irradiance on the evaporation performance were systematically investigated. Results showed that under 5 sun (1 sun = 1 kW/m 2 ) irradiation, the NPM obtained the highest evaporation capacity together with a considerable evaporation efficiency (52.7%) for NPs deposition of 1.0 g/m 2 . In addition, an evaporative efficiency of up to 68.6% was attained under the solar irradiance of 1 sun. On the other hand, most of the heat lost was transferred into the bulk water and gave rise to the enhancement of sensible heat energy, which can be further used in a volumetric absorption type solar collector.
研究领域:
材料科学
·
能源工程
✓ 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）