Scientific Reports
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2017
·Vol. 7
·期 1
·1-10
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IF 4.259
Huang Renkun,Liang Ruowen,Fan Haimei,Ying Shaoming,Wu Ling,Wang Xuxu,Yan Guiyang
With increasingly stringent environmental regulations, the removal of nitrogen-containing compounds (NCCs) from gasoline fuel has become a more and more important research subject. In this work, we have successfully synthesized TiO 2 /α-Fe 2 O 3 heterogeneous photocatalysts with different mass ratios of TiO 2
vs . α-Fe 2 O 3 . Taking photocatalytic denitrification of typical alkali NCCs, pyridine, in gasoline fuel under visible light irradiation (λ ≥ 420 nm) as the model reaction, the TiO 2 /α-Fe 2 O 3 hybrids have exhibited enhanced photocatalytic activity compared with pure TiO 2 and α-Fe 2 O 3 , giving a pyridine removal ratio of ∼ 100% after irradiation for 240 min. The improved photocatalytic performance can be attributed to the integrative effect of the enhanced light absorption intensity and more efficient separation of photogenerated electron-hole pairs. Importantly, this type of heterogeneous photocatalysts can be easily separate in the reaction medium by an external magnetic field that is very important for industrial purpose. In addition, major reaction intermediates have been identified by the liquid chromatograph-mass spectrometer (HPLC-MS) and a tentative photocatalytic denitrification mechanism has been proposed.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY
·
2025
·
IF 1.7
Hongyu CHEN,Ru TIAN,Jianke LI,Beibei HAN,Guoku LIU,Shiyu YIN,Guiying XU,Kun WANG,Fukuan WANG,Baigang AN,Dongying JU,Weimin ZHOU
TiO2 as a semiconductor photocatalyst has been extensively utilized in the purifications of water and air. However, the wide band gap of TiO2 necessitates its activation by ultraviolet irradiation, when it is utilized as a photocatalyst. To enhance the photocatalyst performance of TiO2, constructing the heterojunction containing TiO2 is considered as a highly effective method. To unfold the actual application, iron metal oxides are firstly utilized to construct the heterojunction of TiO2/α-Fe2O3, and the synthesized TiO2/α-Fe2O3 heterojunction was successfully coated on the surface of coal tar pitch based spherical activated carbons (CTP-SACs). The structures of TiO2/α-Fe2O3/CTP-SACs are verified by the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results of UV-vis absorption spectroscopy supports that TiO2/α-Fe2O3/CTP-SACs are promising candidates for the natural light photoncatalysis. It is believed that the exceptional conductivity of CTP-SACs enhances the activity of the photocatalyst, resulting in the TiO2/α-Fe2O3/CTP-SACs exhibiting remarkable sterilization effects under natural light. For instance, the TiO2/α-Fe2O3-60-CTP-SAC shows an excellent sterilization rate (89 %) for the fish culture water under the irradiation of natural light for 20 min. Associating with the excellent liquidity of CTP-SACs, it is considerable that TiO2/α-Fe2O3/CTP-SACs possess the captivating application prospects in a field of the feeding water treatment.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xianjiu Liao,Jianjun Luo,Jing Wu,Taotao Fan,Yao Yao,Fenglei Gao,Yong Qian
In this work, a sensitive DNAzyme-based electrochemical sensor had been developed for Pb 2+ detection with platinum nanoparticles decorated TiO 2 /α-Fe 2 O 3 composite as signal labels. The morphological and compositional properties of the PtNPs/TiO 2 /α-Fe 2 O 3 were examined by using transmission electron microscopy , X-ray diffraction, and X-ray photoelectron spectroscopy. The result showed that the shape of α-Fe 2 O 3 nanocrystals were the cubic, the average length ranged from 150 to 300 nm, and the PtNPs with about 3–4 nm in diameter were well dispersed on the surface of TiO 2 /α-Fe 2 O 3 . TiO 2 /α-Fe 2 O 3 were used as a “carrier” to load the PtNPs tracers as well as for Apt3 immobilization. In turn, the DNAzyme structure of Apt1 and Apt2 was immobilized on the gold electrode surface as the capture probes. Subsequently, DNAzyme modified electrodes reacted with target Pb 2+ and the Apt3/PtNPs/TiO 2 /α-Fe 2 O 3 composite were deposited on the electrode surface. The performance of the DNAzyme-based electrochemical sensor was tested by recording the electrocatalytic reduction current toward H 2 O 2 . Enhanced sensitivity was achieved by TiO 2 /α-Fe 2 O 3 nanocomposites as a nanocarrier in order to PtNPs at a high ratio. The DNAzyme-based electrochemical sensor described here exhibited excellent sensitivity and specificity for target ion. This work represented a promising potential for on-site testing Pb 2+ in real drinking water and serum sample analysis.
研究领域:
生物传感技术
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纳米材料科学
·
环境监测
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chen Wang,Yinglin Wang,Pengfei Cheng,Luping Xu,Fan Dang,Tianliang Wang,Zhaohui Lei
A highly sensitive and selective acetone gas sensor has been fabricated successfully by designing n-n heterojunction consisting of TiO 2 nanorods and α -Fe 2 O 3 branches. The structure and morphology of the TiO 2 / α -Fe 2 O 3 nanocomposites were examined via X-ray diffraction and scanning electron microscopy, respectively. TiO 2 nanorod (with the diameter about 42 nm) arrays were in-situ generated on the surface of Al 2 O 3 ceramic tubes by a simple hydrothermal process. In addition, α -Fe 2 O 3 branches grew on TiO 2 stems successfully in the second hydrothermal process. These nanorod branches had a relatively uniform length, which could be tunable by changing the concentration of iron precursor. The gas sensing properties of the pristine and α -Fe 2 O 3 branches-decorated TiO 2 nanorods sensors with regard to acetone gas were investigated. The results indicated that the sensor based on TiO 2 / α -Fe 2 O 3 heterostructures measured at 225 °C had a higher response of 21.9 toward 100 ppm of acetone gas which was about 9 times higher than pristine TiO 2 nanorods sensor. The dominant mechanism for enhanced sensing properties were discussed in detail with the semiconductor depletion layer model and TiO 2 / α -Fe 2 O 3 n–n heterojunction theory.
研究领域:
材料科学
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纳米技术
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传感器技术
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气体传感
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）