MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Zhiyao Yan,Wanxia Huang,Xiongrui Jiang,Junzheng Gao,Yiwen Hu,Hengzhong Zhang,Qiwu Shi
Black TiO 2 has attracted great attentions due to its wide application potentials in visible-light photocatalysis , solar-thermal conversion for water evaporation, photothermal therapy and so on because of its controllable band gap using lattice disorder engineering. In this work, we proposed the design of microporous hollow structure in black TiO 2 with thickness-controllable nano-shells to further optimize its photocatalytic ability. The hollow shells were produced from the evaporation-induced self-assembly (EISA) followed by NaBH 4 reduction, and the shell thicknesses could be adjusted from ~20 to ~145 nm. The prepared microporous hollow shells showed excellent light absorption and enhanced photocatalysis performance with decreased shell thickness. Under visible light irradiation, the photocatalytic efficiency of the 20-nm shells was ~8 times higher than that of the 145-nm shells, revealing the strong promotion effect of the nano-shell design on the photocatalytic activity of hollow black TiO 2 . This great effect can be attributed to the higher surface area, more catalytic active sites and less diffusing distance in pore channels of the thinner shells. Our work demonstrates a scheme for the porous hollow structural design of black TiO 2 with ultrathin nano-shell, and provides significant insights for its applications in higher efficiency of visible-light utilization and photocatalysis.
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
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Penghui Shao,Jiayu Tian,Zhiwei Zhao,Wenxin Shi,Shanshan Gao,Fuyi Cui
Visible light photocatalytic activity of amorphous TiO 2 doped with carbon is prepared by a facile sol-gel route for the first time. The most active sample with mesostructure of amorphous phase, high surface area (273 m 2 g −1 ) and large pore volume (0.33 cm 3 g −1 ) is identified by X-ray diffractometer, Raman spectrometer, transmission electron microscope and N 2 adsorption–desorption isotherms. In addition, the most active sample is characterized by Fourier transform-infrared spectrometer, X-ray photoelectron spectrometer, UV–vis diffuse reflectance spectrometer and luminescence spectrometer. The results show that the most active sample with oxygenic groups has a narrower bandgap and lower recombination of electron–hole, due to the carbon doping and phase of amorphous. Effective photodegradation capability and stability of rhodamine B and colorless 4-chlorophenol are verified by photocatalytic tests under visible light irradiation. A possible mechanism of amorphous TiO 2 doped with carbon for visible light photocatalysis is proposed. The findings of this paper will provide new insights to design visible light-induced photocatalyst based on amorphous TiO 2 for organic removal.
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
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Wenwen Ma,Yan Xu,Kaiwen Ma,Hong Zhang
H 3 PW 12 O 40 /TiO 2 (abbreviated PW 12 /TiO 2 ) nanofibers catalysts have been successfully prepared via calcinating off the respective electrospun PVP/[PW 12 + Ti(OC 4 H 9 ) 4 ] composite nanofibers for the first time and they show ultra-deep desulfurization catalytic performance in mild conditions. PW 12 /TiO 2 nanofibers consist of anatase phase TiO 2 and Keggin structure PW 12 , the diameter of which is approximately 100 nm. Compared with PW 12 /TiO 2 nanoparticles, 40 wt.% PW 12 /TiO 2 nanofibers (the weight percentage of PW 12 loading on TiO 2 nanofibers was 40%) exhibited the higher catalytic activity under the same conditions. DBT could be removed completely within 30 min at 70 °C using 0.02 g 40 wt.% PW 12 /TiO 2 nanofibers as catalysts, when ionic liquid (IL) [Bmim]PF 6 was as extraction agent. Additionally, sulfur removal of different substrates decreased in the following orders: DBT > BT > 4,6-DMDBT under the same conditions. Even after 5-times recycling, the catalytic activity of 40 wt.% PW 12 /TiO 2 nanofibers was not significant decreased. As a total result, these novel PW 12 /TiO 2 nanofibers can be used to deeply desulfurize in the industry.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2016
·
IF 1.34
Ya-hui YANG,Ren-rui XIE,Hang LI,Can-jun LIU,Wen-hua LIU,Fa-qi ZHAN
A novel WO 3– x /TiO 2 film as photoanode was synthesized for photoelectrocatalytic (PEC) reduction of CO 2 into formic acid (HCOOH). The films prepared by doctor blade method were characterized with X-ray diffractometer (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The existence of oxygen vacancies in the WO 3– x was confirmed with an X-ray photoelectron spectroscopy (XPS), and the accurate oxygen index was determined by a modified potentiometric titrimetry method. After 3 h of photoelectrocatalytic reduction, the formic acid yield of the WO 3– x /TiO 2 film is 872 nmol/cm 2 , which is 1.83 times that of the WO 3 /TiO 2 film. The results of PEC performance demonstrate that the introduction of WO 3– x nanoparticles can improve the charge transfer performance so as to enhance the performance of PEC reduction of CO 2 into formic acid.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Liangfan Qu,Guiyun Chen,Shuang Dong,Yaoxing Huo,Zhonglin Yin,Shuhong Li,Ye Chen
Highly dispersible TiO 2 nanoparticles were prepared through the hydrolysis of titanium alcohol, and a series of TiO 2 -modified zein/chitosan (CS) films were prepared through a process involving blending, solution casting and evaporation. The mechanical properties and the antibacterial capacity of the zein/CS/TiO 2 films were characterized to explore the effects of different TiO 2 nanoparticle contents. Results showed that the addition of nanoscale TiO 2 remarkably improved the mechanical properties and thermal stability of the zein/CS/TiO 2 film. The tensile strength of the zein/CS/TiO 2 films significantly increased (p<0.05) with the increasing TiO 2 loadings in films, reaching a maximum of 28.33 ± 1.53 MPa at 0.15 wt % TiO 2 nanoparticles. The antibacterial effect of the composite films on Gram-positive bacteria ( S. aureus ) was more significant than that of Gram-negative bacteria ( E. coli and S. enteritidis ), and the antibacterial effect of UV light was better than that of dark conditions. In particular, the inhibition zones of zein/CS/TiO 2 (0.15%) film against E. coli , S. enteritidis and S. aureus under UV light condition increased by 21.78%, 21.45%, and 26.44%, respectively, compared with the control. This study suggested that adding highly dispersible TiO 2 nanoparticles is an effective method for improving the mechanical and antimicrobial properties of zein/CS films for various applications, such as medical and food packaging.
研究领域:
材料科学
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生物学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jun Li,Xiangbin Sun,Yaping Zhang,Tingjun Lu,Zeyuan Wang,Yufeng He,Rongmin Wang
Organic dyes pollution (especially methylene blue) in wastewater has seriously affected the livelihood and health of human beings. To address this issue, in this study, loess-based N-doped TiO 2 (NTiO 2 @ALS) photocatalysts were fabricated through in situ deposition of N-doped TiO 2 (NTiO 2 ) nanoparticles on the surface of acidified loess (ALS) particles by sol-gel method. The characterization was performed by XRF, SEM, FT-IR, XRD, XPS, UV–Vis DRS and BET, and small nanoparticles of NTiO 2 were found to be perfectly bound to the surface of the ALS particles. In addition, what factors affecting the photocatalytic activity were explored and it was found that calcination at 450 °C for 2 h was the best condition, under which the samples possessed the highest degradation efficiency under visible light irradiation. Furthermore, NTiO 2 @ALS was applied to the degradation of methylene blue (MB) and the mechanism of pre-adsorption and photocatalytic degradation was also investigated. Surprisingly, methylene blue (MB) could be degraded by 99.6% post pre-adsorption. This excellent result was attributed to the existence of dual coordination between catalytic active center (NTiO 2 ) and support (ALS) in NTiO 2 @ALS. Most significantly, the introduced ALS particles achieved the effective dispersion of small NTiO 2 nanoparticles and increased the specific surface area of materials, which greatly improved photocatalytic performance and adsorption properties. In brief, NTiO 2 @ALS holds promising application potential for the removal and degradation of organic dyes from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Yuxin Gu,Lixin Wei,Chao Liu,Xinlei Jia,Weining Qin,Lijun Shi,Lin Zhang
In order to solve the problem of demulsification of oil-water emulsion, a new type of highly efficient and recyclable magnetic fluorine-containing polyether composite demulsifier (Fe3O4@Ti-F) was synthesized. Fe3O4@Ti-F was prepared by one-pot method to combine magnetic nanomaterial TiO2 with Fe3O4 and graft fluorinated polyether. The successful synthesis of Fe3O4@Ti-F was confirmed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and X-ray diffraction (XPS). The demulsification performance of Fe3O4@Ti-F was evaluated by using the self-made crude oil emulsion as the experimental object. The demulsification mechanism of the demulsifier and the influence of external factors such as temperature and pH on the demulsification performance of the demulsifier were discussed, and the amount of TiO2 in the preparation process was determined. The results show that the demulsification efficiency of 50:50 (v/v %) W/O emulsion can reach 90.83% when the dosage of Fe3O4@Ti-F is 600 mg/L, the temperature is 65 °C and the time is 30 min. In the neutral acid environment, the demulsification rate of the demulsifier is above 80%. In addition, Fe3O4@Ti-F has been proved to have good magnetic effect. Under the action of external magnetic field, it can be recovered and recycled from the two-phase system for 4 times, and its demulsification efficiency is still above 60%. Fe3O4@Ti-F will have broad application prospects in the field of oil-water separation in an energy-saving way.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Liuqing Li,Yaping Wang,Yu Ruan,Tiefeng Xu,Shaoyi Wu,Wangyang Lu
The photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is important to facilitate the conversion of biomass into high-value compounds under mild conditions. This study developed Au/TiO 2 catalysts through the urea deposition method, subsequently integrating them with iron phthalocyanine (FePc) via ball milling, resulting in FePc/Au-TiO 2 . These catalysts were calcined at various temperatures. The results indicated that Au nanoparticles are uniformly dispersed on TiO 2 , and Fe in FePc/Au TiO 2 calcined at 410 °C mainly exists in the form of ferrosoferric oxide (Fe 3 O 4 ). FePc/Au-TiO 2 with 30 % FePc which calcined at 410 °C demonstrated outstanding photocatalytic activity, achieving a 97 % yield of FDCA. The effects of various experimental parameters on the conversion of HMF to FDCA were investigated, such as the calcination temperatures, the FePc amount, base, and catalyst dosage. Electron paramagnetic resonance and active species capture tests revealed the catalyst can convert O 2 into •O 2 – and 1 O 2 through excited electrons and photogenerated holes. This study highlights the role of interfacial coupling interactions in boosting catalytic performance, offering a novel approach for photocatalyst development in converting HMF to FDCA.
研究领域:
化学工程
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Huiqin Wang,Xiaolin Liu,Xinlin Liu,Pengwei Huo,Qingfeng Guan
Polypyrrole–TiO2 composited photocatalysts have been prepared by sol–gel method. The as-prepared photocatalysts were characterized by scanning electron microscopy, X-ray diffraction, and FT-IR. The results showed that the polypyrrole–TiO2 consists of well-defined hollow tubes with the size of inner diameter 0.5–1 μm, and the hollow tubes exhibited non-crystal phase and it was well-formed anatase phase at high temperature treatment. The performances of polypyrrole–TiO2 were tested by adsorption and degradation of salicylic acid. The adsorption equilibrium data, at different temperatures, were described by the Langmuir, Freundich, Temkin and Dubinin–Radushkevich isotherm models. The results showed that the Langmuir model was well fit to the equilibrium adsorption data, and the adsorption capacities could reach 32.4 mg g−1. The photocatalytic degradation activity of salicylic acid with polypyrrole–TiO2 was investigated under visible light irradiation. It was revealed that the degradation rate of salicylic acid with the polypyrrole–TiO2 which synthesized at 5°C without heat treatment could reach 48.6%. And the kinetics of photocatalytic degradation obeyed second-order kinetics.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Carbon Letters
·
2024
·
IF 5.5
Liu Rui,Zhang Xin,Han Xue,Sun Yuan,Jin Shuang,Liu Ri-jia
Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst has been fabricated using a simple ultrasonic method with high photocatalytic activity. The morphology, structure and optical properties of Fe 3 O 4 /g-C 3 N 4 /TiO 2 were systematically investigated by a variety of characterization techniques. The optimum degradation conditions were investigated by degrading tetracycline (TC) under visible light irradiation. The results showed that the degradation efficiency was the highest when the initial TC concentration was 5.0 mg/L, the pH value was 11 and the catalyst dosage was 1.0 g/L. After 100 min of visible light irradiation, the degradation efficiency of TC achieved at 73.61%, which was 1.64 and 1.19 times that of g-C 3 N 4 and Fe 3 O 4 /g-C 3 N 4 , respectively. Moreover, Fe 3 O 4 /g-C 3 N 4 /TiO 2 had good stability and recyclability. The results of capture experiments showed that ‧O 2 − and ‧OH were the main active species during the photocatalytic process, and a possible photocatalytic reaction mechanism of Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst was proposed. This study provides a new way to improve the photocatalytic performance of g-C 3 N 4 , which has great potential in degrading pollutants such as antibiotics in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 47
·期 5
·1666-1673
·
IF 4.029
Yan Lv,Lin Yue,Qian Li,Baoyi Shao,Sen Zhao,Haitao Wang,Shijia Wu,Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol–gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB). Most importantly, the obtained materials exhibit remarkable magnetic properties because of the addition of a magnetic component (Fe3O4), therefore, the photocatalysts possess desired recyclability and reusability, which is significant for actual applications. Finally, the possible photocatalysis mechanism of the nanohybrids is discussed and hydroxyl radicals (OH˙) are confirmed as the main reactive species.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Lihuan Mo,Peiqi Lyu,Zhen Yang,Jie Gong,Kai Liu,Jun Li
Bagasse pulp wastewater has restricted and disturbed the bagasse pulp industry all the time. In this paper, photocatalytic oxidation technology (O 3 +UV+TiO 2 ) was applied to bagasse pulp wastewater treatment. TiO 2 was prepared into a composite photocatalyst (La-TiO 2 /Al 2 O 3 ) to improve the treatment effect. p-Chlorophenol was chosen as a target compound to evaluate the catalytic activity and study the preparation process of La-TiO 2 /Al 2 O 3 . La-TiO 2 /Al 2 O 3 was finally used in the treatment of real bagasse pulp wastewater with photocatalytic oxidation technology. Under an optimum experiment conditions, chemical oxygen demand (COD) and total organic carbon removal rate of bagasse pulp wastewater reached 80.2% and 77.1%, respectively, and AOX dropped to 2.9 mg/L. Most organic pollutants in the wastewater had been removed. Additionally, in the reusability study, COD removal was maintained at 70.5% at 7th reuse. These findings of present study revealed that La-TiO 2 /Al 2 O 3 held great potential in the practical photocatalytic degradation application of industrial organic wastewater.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）