RSC Advances
·
2020
·Vol. 10
·期 44
·26142-26150
·
IF 3.119
Binyu Xu,Samuthirarajan Senthilkumar,Wei Zhong,Zhongquan Shen,Chunxin Lu,Xiaoming Liu
In this work, core–shell Fe3O4@Cu2O and Fe3O4@Cu2O–Cu nanomaterials for aerobic oxidation of benzylic alcohols are reported with 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) and N-methylimidazole (NMI) as the co-catalysts. To anchor Cu2O nanoparticles around the magnetic particles under solvothermal conditions, the magnetic material Fe3O4 was modified by grafting a layer of L-lysine (L-Lys) to introduce –NH2 groups at the surface of the magnetic particles. With amine groups as the anchor, Cu(NO3)2 was used to co-precipitate the desired Cu2O by using ethylene glycol as the reducing agent. Prolonging the reaction time would lead to over-reduced forms of the magnetic materials in the presence of copper, Fe3O4@Cu2O–Cu. The nanomaterials and its precursors were fully characterized by a variety of spectroscopic techniques. In combination with both TEMPO and NMI, these materials showed excellent catalytic activities in aerobic oxidation of benzylic alcohols under ambient conditions. For most of the benzylic alcohols, the conversion into aldehydes was nearly quantitative with aldehydes as the sole product. The materials were recyclable and robust. Up to 7 repeat runs, its activity dropped less than 10%. The over-reduced materials, Fe3O4@Cu2O–Cu, exhibited slightly better performance in durability. The magnetic properties allowed easy separation after reaction by simply applying an external magnet.
研究领域:
材料科学
·
催化
·
化学工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Benjie Zhu,Guofei Jiang,Yan Lv,Fang Liu,Juan Sun
In oilfield produced water, polyacrylamide (PAM) is a kind of organic polymer , which may gradually degrade to produce a large number of acrylamide (AM) monomer , and cause great damage to the peripheral nervous system of human and animals. In order to improve its removal efficiency, rGO@Fe 3 O 4 /Cu 2 O@ZnO magnetic composites with strong hydrophobicity , high photocatalytic performance and recyclability was prepared. The degradation process of PAM on composites photocatalyst was studied by simulating the sunlight irradiation, and the magnetic recovery performance and photocatalytic stability of composite were explored. Finally, the photocatalytic degradation mechanism of rGO@Fe 3 O 4 /Cu 2 O@ZnO composite was discussed by free radical capture experiment. The results showed that the highest photocatalytic degradation efficiency was 97.3% when the mass ratio of GO@Fe 3 O 4 and Cu 2 O@ZnO was 1:5, the dosage of rGO@Fe 3 O 4 /Cu 2 O@ZnO was 0.6 g L −1 , pH value was 7 and the initial concentration of PAM was 100 g L −1 . After four cycles, the magnetic recovery and degradation efficiency of PAM can still up to 91.3% and 81%, respectively, which both meet the needs of magnetic recovery and photocatalysis . In addition, according to the free radical capture experiment, the main active species was superoxide radical (·O 2− ). This work provides a strategy for designing magnetic composites with hydrophobic and high catalytic for photodegradation of organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaohan Wang,Jingru Wang,Wenshi Zhao,Rui Guo,Sicheng Cui,Jie Huang,Jiaxin Lu,He Liu,Yang Liu
Tetracycline (TC) is widely distributed in environment and a significant environmental pollutant. It has been challenging to rapidly identify and effectively remove TC contaminants. This work produced a multifunctional Fe 3 O 4 -Cu 2 O-Au-MIPs nanocomposite (FCAu-MIPs NCs) based on molecular imprinting technology for selective SERS detection and photocatalytic degradation of TC. We synthesized FCAu NCs with various Au contents and analyzed the relationship between Au content and SERS performance using finite-difference time-domain (FDTD) technique. Exceptional SERS performance could be attributed to the dense distribution of multiple hotspots on the SERS substrate. The photocatalytic mechanism of FCAu-MIPs NCs towards TC was also discussed. The combination of the narrow-bandgap semiconductor Cu 2 O and noble metal Au with localized surface plasmon resonance (LSPR) effect facilitated efficient light absorption and enhanced charge carrier transfer efficiency. Both SERS detection limits as low as 10 −9 M and selective photocatalytic degradation of TC in soil were achieved. Furthermore, FCAu-MIPs NCs were successfully recovered and reused with assistance of external magnetic field. After six cycles, outstanding SERS and photocatalytic capacities from FCAu-MIPs NCs could still be maintained. The FCAu-MIPs NCs with selective recognition ability to TC should thus hold tremendous applicative possibilities for highly sensitive detection and efficient degradation of TC.
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
Molecular Catalysis
·
2018
·
IF 0
Yanqun Zhang,Pengran Guo,Manyu Jin,Ge Gao,Qiaoyue Xi,Hua Zhou,Guobao Xu,Jingwei Xu
A new visible and near-infrared light-responsive heterogeneous Photo-Fenton catalyst, Fe 3 O 4 @Cu 2 O/carbon quantum dots (CQDs)/nitrogen-doped carbon quantum dots (N-CQDs) (FCCN) was prepared under mild conditions with the structure of double quantum dots growing on the surface of Fe 3 O 4 @Cu 2 O nanoparticles. The prepared FCCN could be used for the degradation of azo compounds, such as methyl orange, acid orange II and mordant yellow 10, even at neutral and alkaline pH (pH: 7–12) with a shortest complete degradation time of 15 min. During the Photo-Fenton process, CQDs and N-CQDs acting as up-converting photo-sensitizers improved the utilization of the light, in which the contribution of N-CQDs was greater than that of CQDs. Besides, CQDs and N-CQDs could transfer photo-generated charges between Cu 2 O and Fe 3 O 4 for the rapid decomposition of H 2 O 2 to OH. CQDs as solid light-sensitive acid sites could consume OH − and enable the efficient decomposition of H 2 O 2 under alkaline conditions. The magnetism of Fe 3 O 4 made this catalyst easily separated and the insoluble layers of CQDs and N-CQDs allowed it to be repeatedly used without activity change even after 10 cycles. The degradation constant of methyl orange in FCCN/H 2 O 2 /light system is 5.4 times higher than that of the Fe 3 O 4 @Cu 2 O/H 2 O 2 /light system, indicating that the loaded quantum dots greatly enhanced the photocatalytic activity. The degradation constant in FCCN/H 2 O 2 /light system was 2.5 times higher than that of the simple mixture (Fe 3 O 4 @Cu 2 O + CQDs + N-CQDs)/H 2 O 2 /light system, which indicated these excellent catalytic performances should come from the synergism effect of all components in FCCN.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
ChemistrySelect
·
2026
·Vol. 11
·期 34
·e74397
·
IF 2.3
Xiuzhu Ma,Fengyuan Tian,Xinghao Yan,Dan Xue
Efficient removal of bisphenol A (BPA) from aquatic environments is urgently needed due to its toxicity and persistence. Peroxymonosulfate (PMS)-based advanced oxidation processes offer a promising solution, and their effectiveness critically depends on catalysts with efficient charge transfer and stable interfacial properties. Herein, a magnetically recyclable Fe 3 O 4 /Cu 2 O heterojunction was constructed via covalent esterification between polydopamine and citrate layers on each component. Under optimized conditions (catalyst: 90 mg/L, PMS: 2.0 g/L, BPA: 20 mg/L, pH 11), the heterojunction achieved 98% BPA removal within 60 min and retained over 90% of its initial activity after five cycles. Mechanism investigation confirmed •OH and SO 4 • − were the dominant reactive species and elucidated a plausible BPA degradation pathway. This work provided an efficient and recyclable photocatalyst for water treatment and establishes an interfacial engineering strategy for constructing advanced catalysts with promising applications in the environmental and energy fields. Graphical Schematic illustration of the proposed mechanism for PMS activation and BPA degradation over the Fe 3 O 4 /Cu 2 O heterojunction.
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 5
·1003-1009
·
IF 1.6
Wang Jingjing,Zhang Yawen
Fe 3 O 4 and Cu 2 O were successively immobilized on alkali-treated straw, and the magnetically separable straw@Fe 3 O 4 /Cu 2 O composite was obtained. The straw@Fe 3 O 4 /Cu 2 O was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and vibrating sample magnetometry, respectively. Photocatalytic performance of the straw@Fe 3 O 4 /Cu 2 O was evaluated by measuring the degradation of methyl orange (MO) under irradiation of visible light. The introduction of Fe 3 O 4 not only endowed the straw@Fe 3 O 4 /Cu 2 O with magnetic separation feature but also significantly enhanced photocatalytic activity because Fe 3 O 4 could prevent recombination of hole-electron pairs. The active species capture experiment showed that holes (h + ), hydroxyl (·OH) and superoxide (·O 2 − ) radicals all took part in the MO degradation. In addition, the photocatalytic mechanism of straw@Fe 3 O 4 /Cu 2 O was proposed based on the experimental results. After five cycles for the photodegradation of MO, the straw@Fe 3 O 4 /Cu 2 O still displayed good photocatalytic activity, suggesting that the as-prepared composite had great potential for practical use in wastewater treatment.
✓ 已验证
DOI
高影响因子
Inorganics
·
2026
·Vol. 14
·期 7
·188
·
IF 3.4
Haocheng He,Boya Ma,Haozhe Sun,Zimeng Li,Huixu Liu,Wenshi Zhao,Naveen Reddy Kadasala,Bo Feng,Yang Liu
The persistent accumulation of tetracycline (TC) antibiotics in aquatic environments poses severe ecological and public health risks, necessitating the development of multifunctional platforms capable of simultaneous detection and degradation. Herein, we report magnetically recoverable plasmonic Fe3O4/Cu2O-Ag nanocomposites (NCs) that integrate visible-light-driven photocatalysis with ultrasensitive surface-enhanced Raman scattering (SERS) detection. Hierarchical flower-like Fe3O4nanocrystals were employed as magnetic supports, followed by in situ growth of Cu2O nanocrystals and controlled deposition of Ag nanocrystals. The optimized composite (FCA-2) exhibited enhanced visible-light absorption (Eg= 1.86 eV), suppressed electron–hole recombination, and improved photocurrent response, which were attributed to Schottky barrier formation at the Cu2O-Ag interface and localized surface plasmon resonance (LSPR) effects. Under simulated solar irradiation, FCA-2 NCs achieved 91.79% degradation of TC within 60 min, following pseudo-first-order kinetics (k = 20.37 × 10−3min−1). Finite-difference time-domain (FDTD) simulations revealed that optimal Ag loading maximized plasmonic “hot spot” density, thereby enhancing electromagnetic field intensity and SERS performance. The FCA-2 substrate enabled ultrasensitive TC detection with a limit of detection of as low as 10−10M. Moreover, the superparamagnetic Fe3O4core allowed for rapid magnetic separation and sustained performance over multiple SERS–photocatalysis cycles, with negligible signal attenuation after 30 days. This work presents a rational strategy for constructing plasmonic magnetic NCs that synergistically couple photocatalytic remediation, ultrasensitive sensing, and magnetic recyclability, offering significant potential for integrated environmental monitoring and sustainable water treatment applications.
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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）