CHEMICAL ENGINEERING JOURNAL
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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
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环境科学
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光催化技术
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产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 41
·17488-17495
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IF 7.394
Zuyang Zheng,Zhibin Fang,Xinxin Ye,Xiaobin Yao,Xianzhi Fu,Sen Lin,Ping Liu
Surface oxygen vacancy has been investigated extensively due to its great influence on photocatalysis in recent years. Among these investigations, the location of surface defects is found to be a key factor during the photocatalytic procedure. Especially when a crystal facet is involved, the synergistic action between these two factors may greatly increase the photocatalytic efficiency. Location of defects would greatly help in understanding the mechanism of this coupling action. Without an available technique, however, it is very difficult to gain the position information directly. In this paper, we provide a low-cost and visualized method to solve this problem via in situ reduction of Au. TiO2 with surface oxygen vacancy on a specific area is synthesized via a photochemical reaction. Then the Au ion was reduced at the place where oxygen vacancy exists on the TiO2 surface. Hence, the localization of surface vacancy will be determined by examining the location of Au particles. Moreover, application of this method can be extended to other surface defects such as oxygen vacancy on oxide semiconductors, Ti3+ in TiO2, Zn vacancy on ZnO, etc. This technique is helpful for understanding how surface defects affect the properties of semiconductors.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
ENERGY
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2017
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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
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能源工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 21
·10191-10200
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IF 3.925
Fang-Di Wu,Jyh-Cherng Chen,Zi-Tao Yang
A C/Ho co-doped TiO2 catalyst was prepared by the precipitation–calcination method using Ti3C2Tx as the precursor and carbon source. X-ray diffractometry, transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption isotherms, UV-Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and photoelectrochemical measurements were used for characterization. The C doped anatase TiO2 prepared by calcining Ti3C2Tx maintained the two-dimensional lamellar structure of the Ti3C2Tx precursor, and the carbon dopant was present on the surface of TiO2 in the form of C–O and CO, whereas Ho3+ was mainly doped into the lattice of TiO2, forming Ho–O bonds with oxygen instead of Ti4+. The band gap of the C/Ho co-doped TiO2 photocatalyst was reduced as compared to that of pristine TiO2, which can improve the utilization efficiency of visible light. When the doping ratio of Ho was 5% (CHT-0.05), the photocatalyst had the highest photocurrent and degradation efficiency of tetracycline hydrochloride (86.4%). The reaction mechanism for the photocatalytic degradation of TCH by the C/Ho co-doped TiO2 photocatalyst was investigated and showed that superoxide radicals (˙O2−) and holes (h+) were the main species that influenced the results. The prepared photocatalyst had good catalytic performance over four cycles, and it was stable and suitable for wastewater treatment.
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
CHEMOSPHERE
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2023
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IF 8.8
Lei Han,Liguo Shen,Hongjun Lin,Zhengyi Huang,Yanchao Xu,Renjie Li,Bisheng Li,Cheng Chen,Wei Yu,Jiaheng Teng
The oily water treatment is becoming one of the hottest topics due to that increase of offshore oil transportation and the various accident oil leakages . In this study, a functional TiO 2 -ABS composite membrane was generated through the three-dimensional (3D) printing strategy for the first time and was conducted to simulated oily water treatment . The TiO 2 -ABS composite membrane demonstrated a significant promotion in hydrophilicity and oleophobicity which were evidenced by the water contact angle of 14.8° and the underwater oil contact angle of 144.7°, respectively. The optimal modified membrane had both exceedingly high flux (1.8 × 10 5 L m −2 ·h −1 ) and oil rejection rate (99.5%). Moreover, the results of filtration cycles of 10 days and extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory demonstrated that the modified membranes took possession of excellent stability and antifouling property. What was more, the TiO 2 -ABS composite membrane revealed over 99% rejection to all five types of oil/water systems. The interestingly experimental results indicated that the prepared membrane possessed a broad development trend and application prospect in the field of oily water treatment.
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
ACS Applied Energy Materials
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2023
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IF 6.4
Ke Wei,Jiu-Xiang Yang,Fang-Yuan Bai,Yuan-Sheng Shen,Kai Liu,Jing Liu,Li-Hua Chen,Yu Li,Bao-Lian Su
Ti3C2 MXene has been extensively studied in the field of photocatalytic hydrogen production since its discovery due to the large specific surface area and adjustable surface groups. However, the weak interaction at the interface of Ti3C2-based composites leads to a high energy barrier, which is not conducive to carrier transport. Herein, we propose the construction of a sandwich Ti3C2/R-TiO2 composite photocatalyst by in situ growing rutile TiO2 (R-TiO2) nanoneedles in Ti3C2 MXene through NaOH oxidation treatment and the microwave hydrothermal method. This in situ synthesis can make Ti3C2 MXene and TiO2 nanoneedles closely link together, which is conducive to carrier transport and material stability. The best Ti3C2/R-TiO2 composite achieves an excellent hydrogen production rate of 1.62 mmol g–1 h–1, as endowed by the 2D nanosheet-constructed sandwich structure, an increased specific surface area, and improved charge carrier separation and transport.
研究领域:
材料科学
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能源科学
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纳米技术
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产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2015
·Vol. 31
·期 3
·519-526
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IF 0.852
YU Jian-Hua,FAN Min-Guang,LI Bin,DONG Li-Hui,ZHANG Fei-Yue
A series of composites consisting of anatase-rutile TiO2 and graphene (TrG) were synthesized by a hydrothermal route. The influence of the amount of graphene oxide on the photocatalytic activity during the degradation of methyl blue was studied. The photocatalysts were characterized
by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET)
specific surface area measurements. The results show that as-prepared TiO2 formed in the anatase and rutile phase with a bar structure and it dispersed uniformly over the surface of the graphene sheets. The composites possess higher catalytic activity because of the strong absorption
capacity of graphene, the establishment of heterojunctions between rutile and anatase TiO2, the remarkable electrical transport between TiO2 and graphene and the high specific surface areas. The photodegradation performance of methyl blue by the TrG composites under UV
light was studied. Our results indicate that the photocatalytic activities of titanium dioxide-graphene composites were higher than those of pure TiO2. We also found that the TrG composites prepared with a loading of 0.8%(mass fraction, w) graphene oxide had the best photocatalytic
activity.
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
SENSORS
·
2024
·Vol. 24
·期 8
·2604
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IF 3.4
Zhihua Zhao,Zhenli Lv,Zhuo Chen,Baocang Zhou,Zhigang Shao
Metal oxide semi-conductors are widely applied in various fields due to their low cost, easy processing, and good compatibility with microelectronic technology. In this study, ternary α-Fe2O3/TiO2/Ti3C2Txnanocomposites were prepared via simple hydrothermal and annealing treatments. The composition, morphology, and crystal structure of the samples were studied using XPS, SEM, EDS, XRD, and multiple other testing methods. The gas-sensing measurement results suggest that the response value (34.66) of the F/M-3 sensor is 3.5 times higher than the pure α-Fe2O3sensor (9.78) around 100 ppm acetone at 220°C, with a rapid response and recovery time (10/7 s). Furthermore, the sensors have an ultra-low detection limit (0.1 ppm acetone), excellent selectivity, and long-term stability. The improved sensitivity of the composites is mainly attributed to their excellent metal conductivity, the unique two-dimensional layered structure of Ti3C2Tx, and the heterojunction formed between the nanocomposite materials. This research paves a new route for the preparation of MXene derivatives and metal oxide nanocomposites.
研究领域:
材料科学
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传感器技术
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纳米技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2015
·
IF 6.723
Shuanglong Ma,Sihui Zhan,Yanan Jia,Qixing Zhou
Fe3O4-TiO2 nanosheets (Fe3O4-TNS) were synthesized by means of lamellar reverse micelles and solvothermal method, which were characterized by TEM, XRD, XPS, BET, and magnetic property analysis. It can be found that Fe3O4-TNS nanosheets exhibited better photocatalytic antibacterial activity toward Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus than pure Fe3O4 and TNS, and the antibacterial efficiency could reach 87.2% and 93.7% toward E. coli and S. aureus with 100 μg/mL Fe3O4-TNS after 2 h of simulated solar light illumination, respectively. The photocatalytic destruction of bacteria was further confirmed by fluorescent-based cell live/dead test and SEM images. It was uncovered that Fe3O4-TNS inactivated G- E. coli and G+ S. aureus by different mechanisms: the destruction of outer membranes and ruptured cell bodies were responsible for the bactericidal effect against E. coli, while the antibacterial effect toward S. aureus were due to the fact that the cells were adsorbed in form of clusters by massive Fe3O4-TNS, which could restrict their activities and cause malfunction of the selective permeable barriers. Furthermore, the antibacterial mechanism was studied by employing scavengers to understand exact roles of different reactive species, indicating the key roles of h+ and H2O2. The recovery and reusability experiments indicated that Fe3O4-TNS still retained more than 90% bacteria removal efficiency even after five cycles. Considering the easy magnetic separation, bulk availability, and high antibacterial activity of Fe3O4-TNS, it is a promising candidate for cleaning the microbial contaminated water environment.
研究领域:
材料科学
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环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2015
·
IF 2.489
Yupeng Gao,Libo Wang,Aiguo Zhou,Zhengyang Li,Jingkuo Chen,Hari Bala,Qianku Hu,Xinxin Cao
TiO 2 /Ti 3 C 2 nanocomposites with high photocatalytic activity were successfully fabricated via a hydrothermal process. The microstructure and phase composition of these composites were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). The photocatalytic performance of pure TiO 2 and TiO 2 /Ti 3 C 2 nanocomposites were evaluated by photodegradation of methyl orange (MO) under ultraviolet light irradiation. Photodegradation tests results revealed that TiO 2 /Ti 3 C 2 have much better photocatalytic activity than pure TiO 2 nanomaterials . And it was suggested that the TiO 2 /Ti 3 C 2 exhibited more effective electron–hole separation than pure TiO 2 and Ti 3 C 2 under UV light irradiation.
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
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Meiqi Chang,Yanhua Song,Jie Chen,Lei Cui,Ye Sheng,Zhan Shi,Haifeng Zou
SiO2@TiO2:Eu3+ core–shell structure was synthesized by a surfactant-free solvothermal method, and its luminescence intensities were increased through a coating SiO2 layer. Furthermore, SiO2@TiO2:Eu3+@SiO2 core double-shell structures with different coating thicknesses have been prepared to examine the relationship between luminescence intensity and thickness. In addition, luminescence enhancement mechanisms including the surface repair effect and excitation/emitted light absorption effect were proposed. Moreover, the luminescence properties and photocatalytic behaviors of SiO2@TiO2:Eu3+ core–shell structure and its derivatives SiO2@TiO2:Eu3+ yolk–shell structure and TiO2:Eu3+ hollow structure have been investigated in detail. It is worth mentioning that yolk–shell and hollow structures could be obtained by changing the order of the calcination and etching process of the SiO2@TiO2:Eu3+ core–shell structure. Herein, the hollow structure showed the highest luminescence intensity, and the core–shell structure exhibited excellent photocatalytic efficiency for the degradation of methyl orange.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2014
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IF 2.726
Pin Lv,Wuyou Fu,Yannan Mu,Hairui Sun,Shi Su,Yanli Chen,Huizhen Yao,Dong Ding,Tie Liu,Jun Wang,Haibin Yang
TiO 2 film materials have very wide applications in photovoltaic conversion techniques. And, TiO 2 nanotubes array film with nanowires directly formed on top (denoted as TiO 2 NTWs) was prepared by the anodization method. CdS and PbS quantum dots (QDs) were firstly cosensitized on the TiO 2 NTWs array (denoted as (CdS + PbS)/TiO 2 NTWs) by novel successive ionic layer adsorption and reaction (N-SILAR), which only needed a cation mixed solution containing Cd 2+ and Pb 2+ and an anionic solution containing S 2− . This N-SILAR method can not only effectively shorten the experimental time, simplify the experiment procedure and reduce the experiment cost, but also make the material of (CdS + PbS)/TiO 2 NTWs possess the advantages of improving electron transport and reducing chemical erosion. Moreover, the photocurrent of (CdS + PbS)/TiO 2 NTWs was 4.1 mA/cm 2 under an illumination of 100 mW/cm 2 . The most eye-popping part was that the result was 8 times higher than that of the bare TiO 2 NTWs array. The result of photoelectrochemical measurements indicated that this novel material had a potential application in photovoltaic devices.
研究领域:
材料科学
·
光电子学
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DOI
高影响因子
危险品化学品经营许可证（带存储）