JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Zhi Zhu,Xu Tang,Wenqian Fan,Zhi Liu,Pengwei Huo,Tianshuai Wang,Yongsheng Yan,Chunxiang Li
A new Co-doped and Fe 3 O 4 quantum dots (QDs) decorated g-C 3 N 4 (CN) photocatalyst applied in the tetracycline degradation under visible light irradiation, is designed and synthesized. The Fe 3 O 4 -QDs@Co CN enhanced photocatalytic activity and cycling ability in comparison with individual CN significantly. It revealed a synergistic effect between the formation of Fe 3 O 4 -QDs and Co-doping. Results of characterization insight into the reason that Co-doped can regulate the band gap of CN, which has been proved by XPS and density functional theory (DFT). Moreover, the oxidation-reduction centre of Fe 3 O 4 -QDs with quantum effect can significantly boost the absorption of visible light and utilization electrons. Therefore, this work provides a broadening window for photo harvesting, charge using and separation during photocatalytic reactions.
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
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Chengxin Wang,Sadaf Mutahir,Liang Wang,Wu Lei,Xifeng Xia,Xinyan Jiao,QingLi Hao
Herein, a double-buffering strategy is presented to boost the lithium storage potential of Fe 3 O 4 . Firstly, the skeleton of MIL-100 (Fe) MOF is grown on graphene oxide, as a self-assembled template via in-situ solvothermal approach, which transform into ultrafine, well-dispersed and mesoporous carbon coated Fe 3 O 4 QDs (4 nm) imbedded on reduced graphene oxide (Fe 3 O 4 QDs@C/rGO), by pyrolysis. Each component in such a well-designed porous hierarchical structure significantly contributes to the remarkable enhancement of lithium ion storage performance, leading to high reversible capability with excellent prolonged cyclic stability after 2000 cycles (505 mAh g −1 at 2.0 A g −1 ). Both, Graphene sheets and mesoporous carbon act as conductive support for anchoring uniform Fe 3 O 4 QDs with confined double buffering for cyclic volume flux. Multi-channels with uniform mesopores in the self-assembled array and 4 nm QDs of Fe 3 O 4 confined in conductive carbon shells were favorable to enhance the interfacial electron/ion transfer, leading to the excellent rate and cycling performance with released volume changes upon Li + insertion/extraction. The present research work provides a promising outset design and synthesis strategies for metal oxide QDs based nanocomposites, which may also be extended to the other electrode material system.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
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2019
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IF 0
Yang Liu,Yan Dai,Xiaobin Jiang,Xiangcun Li,Zhijun Yan,Gaohong He
We report here Fe 3 O 4 quantum dots embedded Fe 3 O 4 @C electrode materials via a facile micelle-colloid template method for pushing forward the Li-ion battery technology. To improve uniform dispersion of Fe 3 O 4 quantum dots (5–10 nm) and create macropores in the carbon matrix, ferric micelle colloids of CTA + X −1 Fe 3+ with chelate adsorption of ferric colloids on CTAB micelle corona by electrostatic attraction has been developed in a resin layer. Thus, nanocrystalline Fe 3 O 4 and graphitic carbon matrix are mutually formed from the same texture during the pyrolysis process, resulting in a tightly tangled carbon-Fe 3 O 4 hybrids. The conformable embedment of Fe 3 O 4 quantum dots in carbon matrix can effectively prevent its loss and alleviate local tension stress for volume variation during change-discharge process. The well structure-designed Fe 3 O 4 @C electrode materials deliver a stable capacity of 601 mA h g −1 at 2 A g −1 even after 800 cycles. This work provides a new strategy for design of transition-metal-oxide based electrode materials for long-life lithium-ion batteries.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Zhi Zhu,Yang Yu,Hongjun Dong,Zhi Liu,Chunxiang Li,Pengwei Huo,Yongsheng Yan
A novel magnetic intercalation Fe3O4-QDs@g-C3N4/ATP photocatalyst was first prepared by a combined eutectic method with deposition technology; it shows superior degradation efficiency for removing 2-mercaptobenzothiazole (MBT) under visible light. The improved photocatalytic performance is mainly attributed to the intercalation effect of attapulgite (ATP) in g-C3N4 together with the quantum effect of Fe3O4 quantum dots (QDs) and the better conductivity between ATP and g-C3N4 resulting in the enhanced separation efficiency of photogenerated electron–hole pairs in the light absorption range. Moreover, insight into this mechanism indicates that the holes and superoxide radicals are the major active species in the MBT removal procedure. This work provides an efficient and promising approach to construct new high-performance g-C3N4-based photocatalytic materials for wastewater treatment.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Runren Jiang,Donghai Wu,Guanghua Lu,Zhenhua Yan,Jianchao Liu,Ranran Zhou,Matthew Nkoom
Herein, Fe 3 O 4 quantum dots modified BiOCl/BiVO 4 p-n heterojunction was successfully synthesized by a facile strategy. Multiple techniques were carried out to characterize the as-prepared samples. Results show that the photocatalysts possess regular crystal structure and consisted of BiOCl/BiVO 4 nanosheet structure with Fe 3 O 4 QDs on its surface. Particularly, 20% Fe 3 O 4 QDs@BiOCl/BiVO 4 p-n heterojunction shows universal outstanding photocatalytic activity for removing four different broad-spectrum antibiotics under visible light. Meanwhile, the mineralization degree and degradation pathways of antibiotic were further studied by 3D-EEMs and LC-MS/MS. The improved photocatalytic performance for degradation of broad-spectrum antibiotics mainly attributes to the effective charge carrier mobility, large specific surface areas, and strong visible light absorption. The photocatalytic reaction mechanism was also revealed by the electron spin resonance (ESR) technique and the active species trapping experiments. The photocatalyst stays stable crystal structures after four reaction cycles and it can be easily separated from the solution by an external magnetic field both demonstrate that the Fe 3 O 4 QDs@BiOCl/BiVO 4 p-n heterojunction has unlimited potential for practical usage. This work is expected to be widely applicable to the removal of broad-spectrum antibiotics.
研究领域:
环境科学
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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）