JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Tong Wu,Hui Zheng,Yichuan Kou,Shilei Jin,Yuhong Jiang,Ming Gao,Lei Chen,Naveen Reddy Kadasala,Yang Liu
In this study, 3D Fe 3 O 4 micro-flowers were synthesized by the self-assembly approach, then rhombic dodecahedral Cu 2 O was successfully loaded onto their surface by wet chemical method . Ag nanocrystals were reduced in situ on the surface of Fe 3 O 4 /Cu 2 O composites to prepare novel Fe 3 O 4 /Cu 2 O/Ag composites. The composites were characterized by SEM, TEM, XRD , XPS, VSM and UV–Vis diffuse reflectance spectroscopy. The effect of Ag nanocrystals on the photocatalytic performance of the Fe 3 O 4 /Cu 2 O composites was investigated by the degradation of methyl orange under visible light irradiation, and the Fe 3 O 4 /Cu 2 O/Ag composites showed higher photocatalytic efficiency than the Fe 3 O 4 /Cu 2 O composites. Photoelectrochemical and PL measurements were carried out to investigate the synergistic effect between the semiconductors and Ag nanocrystals and it was confirmed that the Fe 3 O 4 /Cu 2 O/Ag composites effectively inhibited the recombination of electron-hole pairs, thus improving the photocatalytic activity. The fact that the Fe 3 O 4 /Cu 2 O/Ag composites could be magnetically recycled and that they retained more than 90% of their original activity after six repeated experiments indicates, that they show great potential for wastewater treatment applications.
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RSC Advances
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2021
·Vol. 11
·期 2
·1172-1181
·
IF 3.361
Bo Zhou,Yuling Tang,Liming Zhao,Lijun Guo,Jianfei Zhou
The removal of anionic dyes from wastewater has attracted global concern. In this work, a novel Fe3O4–poly(methacryloxyethyltrimethyl ammonium chloride) (Fe3O4–pDMC) adsorbent for the efficient removal of anionic dyes from wastewater was successfully synthesized by grafting methacryloxyethyltrimethyl ammonium chloride (DMC) on the surfaces of Fe3O4. Various characterization analyses confirmed that the obtained Fe3O4–pDMC possessed numerous functional groups on its surfaces and retained good magnetic separation properties. Fe3O4–pDMC showed ultrafast removal for acid orange 7 (AO7, 58.6%, 1 min) and direct blue 15 (DB15, 98.1%, 1 min), and the maximum adsorption capacity was high (266.8 and 336.5 mg g−1 for AO7 and DB15, respectively). In addition, the adsorption process was in accordance with pseudo-second-order kinetics and the Langmuir isotherm. The mechanism underlying the adsorption of Fe3O4–pDMC on anionic dyes was mainly dependent on electrostatic interaction. This study illustrated that Fe3O4–pDMC has great potential applications as an environmentally friendly, desirable adsorbent for the efficient removal of anionic dyes from wastewater.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Lijun You,Ke Xu,Guanjun Ding,Xinming Shi,Jumei Li,Shaoyun Wang,Jiabin Wang
Magnetic covalent organic framework modified by Fe 3 O 4 nanoparticles (Fe 3 O 4 @COF) were facile synthesized and used as adsorbent for the adsorption of bisphenols from aqueous solutions. The Fe 3 O 4 @COF is synthesized by catalyst-free Schiff base reaction of melamine and terephthalaldehyde, and synthesis strategy is flexible and controllable. The as prepared Fe 3 O 4 @COF was characterized by TEM , PXRD , TGA and BET analysis. The Fe 3 O 4 @COF possessed large specific surface area (335.2 m 2 /g), high chemical and thermal stability, and high saturation magnetization (49.6 emu/g), which in favor of rapid magnetic separation and efficient adsorption in the adsorption process. The effects of temperature, adsorbent dosage, pH and salt concentration on the adsorption of bisphenols (BPA and BPAF) were studied. The as-prepared adsorbent showed an excellent adsorption ability for BPA and BPAF , and the max adsorption capacity of BPA and BPAF could reach 140 and 290.4 mg/g. The adsorption kinetic fitted the pseudo-second-order kinetic model and the adsorption isotherm followed the Freundlich isotherm equation. Moreover, the Fe 3 O 4 @COF presented favorable re-use performance, which kept over 81.4% removal efficiency of bisphenols after five consecutive recycles. The high adsorption performance and reusability make the Fe 3 O 4 @COF a promising adsorbent for the removal of bisphenols.
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Nanomaterials
·
2020
·Vol. 10
·期 7
·1370
·
IF 4.324
Zhenfeng Lin,Ziwei Pan,Yuhao Zhao,Lin Qian,Jingtao Shen,Kai Xia,Yongfu Guo,Zan Qu
PPy-Fe3O4/Kaolin was prepared with polypyrrole functionalized magnetic Kaolin by a simple, green, and low cost method to improve the agglomeration and low adsorption capacity of Kaolin. PPy-Fe3O4/Kaolin was employed to remove Hg2+and the results were characterized by various methods. Relevant factors, including solution pH, dosage of adsorbent, concentration (C0), and temperature (T), were optimized by Response Surface Methodology (RSM) and Central Composite Designs (CCD). The optimal results show that the importance for adsorption factors is pH >T>C0> dosage, and the optimal adsorption conditions of PPy-Fe3O4/Kaolin are pH = 7.2,T= 315 K,C0= 50 mg/L, dosage of 0.05 g/L, and the capacity is 317.1 mg/g. The adsorption process conforms to the pseudo-second-order and Langmuir models. Dubinin–Radushkevich model shows that adsorption process is spontaneous and endothermic. Moreover, the adsorption of mercury by PPy-Fe3O4/Kaolin was achieved mainly through electrostatic attraction, pore diffusion, and chelation between amino functional groups and Hg2+. PPy-Fe3O4/Kaolin has excellent reproducibility, dispersity, and chemical stability, and it is easy to be separated from solution through an external magnetic field. The experiments show that PPy-Fe3O4/Kaolin is an efficient and economical adsorbent towards mercury.Keywords:magnetic material;polypyrrole;kaolin;response surface methodology;mercury
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CHEMICAL PHYSICS LETTERS
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2020
·
IF 2.029
Yuzhe Shi,Yayan Xing,Shixian Deng,Baihan Zhao,Yujie Fu,Zhiguo Liu
Large-scale hydrophilic proanthocyanidins-functionalized Fe 3 O 4 nanoparticles were synthesized via a hydrothermal approach. The obtained Fe 3 O 4 nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results revealed that the Fe 3 O 4 nanoparticles had cubic spinel structure and capped by proanthocyanidins outside. Furthermore, the proanthocyanidins-functionalized Fe 3 O 4 nanoparticles can be utilized to adsorb the heavy metal ions in water. The primary results indicated that the proanthocyanidins-functionalized Fe 3 O 4 nanoparticles have high removal rate for Cu 2+ , Cd 2+ and Pb 2+ in water.
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Journal of Central South University
·
2020
·Vol. 27
·期 4
·1176-1185
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IF 1.249
Jin Lin-feng,Chai Li-yuan,Song Ting-ting,Yang Wei-chun,Wang Hai-ying
Magnetic Fe 3 O 4 @Cu/Ce microspheres were successfully prepared by one-step solvothermal approach and further utilized to remediate toxic arsenic (As(III)) pollution. The effects of Cu/Ce elements co-doping on the crystal structure, catalytic oxidation and adsorption behaviors of magnetic microspheres were researched systematically. The results showed that with the aid of Cu/Ce elements, the grain size reduced, lattice defects increased, and the oxygen vacancies and surface hydroxyl groups were improved. Therefore, Cu/Ce elements endowed magnetic Fe 3 O 4 @Cu/Ce microspheres with excellent As(III) removal performance, whose maximum adsorption capacity reached 139.19 mg/g. The adsorption mechanism mainly involved catalytic oxidant co-adsorption. This research developed a feasible strategy for the preparation of high efficiency magnetic adsorbent to enhance the removal of As(III).
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 16
·6635-6642
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IF 3.288
Mingyu Tang,Guojuan Ren,Fang Chai
This article reports a one-pot hydrothermal strategy for preparing fluorescence carbon dots with magnetic properties (Fe3O4-CDs). Ammonium ferric citrate (AFC) and urea served as the iron and nitrogen sources and both as carbon sources were put into the reaction solvent diethylenetriamine (DETA), which acted as a reductant and nitrogen provider in the process of the synthesis of Fe3O4-CDs. Further, a sensitive and rapid method based on the Fe3O4-CDs was utilized for the detection of Hg2+, simultaneously accompanied with a magnetic removal process. Good linearity was obtained in the range from 2.0 to 200.0 nM with a detection limit of 12.6 nM. The fluorescence quenching mechanism was proved to be caused by an inner-filter effect (IFE) and static quenching effect (SQE). More, this platform was successfully applied for the analysis of Hg2+ in a real sample with satisfying recovery results, thus demonstrating its utility as a convenient monitoring strategy.
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ACS Applied Bio Materials
·
2020
·
IF 0
Weijun Fang,Wenjuan Zhu,Hu Chen,Hanyuan Zhang,Shi Hong,Wenmei Wei,Tingting Zhao
Developing of multifunctional nanoplateforms for simultaneous accurate cancer detection and target therapy is essential in cancer treatment. Herein, we present a facile synthesis of DOX/MNPs-FA nanocomposites for high-performance MRI and tumor-targeted drug delivery. In such core–shell structured DOX/MNPs-FA nanocomposite, the high magnetism of iron oxide core can be tuned and achieved by controlling the Zn2+ dopant amount, making them suitable as excellent contrasts in T2-weighted MR imaging. The outer porous silica shell with large pores about 5.4 nm in diameter possesses high surface area and pore volume. Anticancer drug (DOX molecules) can be stored in the large pore channels and is triggered to be released under acidic condition (pH 4–6). Importantly, the presence of folic acid on the surface of DOX/MNPs-FA allows the targeted delivery of the DOX to tumor cells, and therefore improves tumor chemotherapy efficiency. Our in vitro studies also demonstrated that DOX/MNPs-FA could be efficiently internalized into HeLa cells via the folate receptor-mediated endocytosis, and generate a greater cytotoxicity toward cancer cells compared to free DOX and DOX/MNPs. Therefore, these DOX/MNPs-FA multifunctional nanocomposites have great potential applications for simultaneous tumor diagnosis and targeted chemotherapy.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Ting Zhou,Min Fan,Ruiyun You,Yudong Lu,Luqiang Huang,Yunchao Xu,Shangyuan Feng,Yang Wu,Huiying Shen,Lanjin Zhu
We have successfully prepared a highly sensitive sandwich nanosensor combined Fe 3 O 4 and [email protected] @Ag nanorods for histamine detection based on surface-enhanced Raman spectroscopy (SERS). The Fe 3 O 4 beads with –COOH served as a capture part to enrich histamine. The [email protected] @Ag core-shell nanorods functionalized with Nalpha,Nalpha-Bis(carboxymethyl)- l -lysine (AB-NTA) were then used to connect with the imidazolyl group of histamine, simultaneously the internal standard 4-aminothiophenol (4-ATP) in the core-shell structure was used as the SERS signal. PLS regression model based on concentration range 10 −3 -10 −8 mol/L showed a linear trend with R 2 = 0.9907. Our new approach can quickly and reliably determine histamine in fish sample and RAW264.7 cell lysates. This protocol for histamine extraction and SERS analysis enables the development of ultra-sensitive method for histamine detection.
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Processes
·
2020
·Vol. 8
·期 5
·629
·
IF 2.753
Yanhong Bi,Zhaoyu Wang,Rui Zhang,Yihan Diao,Yaoqi Tian,Zhengyu Jin
In this study, magnetic Fe3O4nanoparticles coated with polydopamine possessing abundant amino groups (Fe3O4@PDA) were conveniently prepared, detailed, and characterized, and then firstly used as a supporting matrix for immobilizingThermomyces lanuginosuslipase (Fe3O4@PDA@TLL). The effects of some crucial factors on the immobilization efficiency were investigated and the optimal protein loading and activity recovery were found to be 156.4 mg/g and 90.9%, respectively. Characterization studies revealed that Fe3O4@PDA@TLL displayed a broader pH and temperature adaptability as compared to the free TLL, which allows its use at wider ranges of reaction conditions. With regard to the stabilities, the immobilized TLL clearly displayed improved pH, thermal, and solvent tolerance stabilities compared to the free enzyme, suggesting that the biocompatible Fe3O4@PDA might be an outstanding material for immobilizing TLL and acting as alternative support for different enzymes.Keywords:magnetic nanoparticle;immobilization;Thermomyces lanuginosuslipase;stability
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Bo-Tao Zhang,Qian Wang,Yang Zhang,Yanguo Teng,Maohong Fan
Carbon dots and nanomagnetites encapsulated in amorphous carbon spheres (CDs/Fe 3 O 4 @CS) with a pomegranate-like structure were synthesized via a solvothermal method and their peroxide activation performances for ibuprofen degradation were investigated in this work. The pomegranate-like nanocomposites, with an average diameter of 451.9 nm, possessed multicores and a 20–50 nm thick amorphous carbon shell. The multicores were composed of multiple 3.9–9.8 nm carbon dots and 5.6–18.6 nm nanomagnetites, as confirmed by X-ray diffraction, X-ray photoelectron, Raman and photoluminescence spectra. The Fe 3 O 4 loading was calculated to be 50.9 wt% according to thermo-gravimetric analysis. CDs/Fe 3 O 4 @CS had a specific surface area of 101.5 m 2 /g and the saturation magnetization of 26.8 emu/g. The CDs/Fe 3 O 4 @CS formation mechanism was proposed based on the characterization results. CDs/Fe 3 O 4 @CS exhibited high catalytic activities for peroxymonosulfate, persulfate and H 2 O 2 with and without visible light illumination, and persulfate showed higher ibuprofen degradation efficiencies. The amorphous carbon shell might benefit ibuprofen enrichment, the nano Fe 3 O 4 provided sufficient reactive sites to activate persulfate, and the CDs could accelerate the degradation due to their excellent electron donating and accepting abilities. The ibuprofen degradation in the CDs/Fe 3 O 4 @CS activated persulfate system followed a pseudo-first-order kinetic model and the activation energy was derived as 27.2 kJ/mol. The CDs/Fe 3 O 4 @CS also presented good reusability performances in the repeated experiments with visible light illumination. Singlet oxygen, hydroxyl and sulfate radicals were verified and the roles of these reactive species in ibuprofen degradation pathways were discussed based on intermediate analysis. The pomegranate-like nanocomposites might provide a potential promising catalyst for pollution control technologies.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jie Yu,Tao Zhang,Yiqiang Sun,Xuejiao Li,Xinyang Li,Bo Wu,Dandan Men,Yue Li
We develop a method to prepare hollow FeP/Fe3O4 hybrid nanoparticles supported on carbon nanotubes (CNTs), which could be used as highly active and efficient electrocatalysts. The Fe@Fe3O4/CNT hybrids were first synthesized by annealing the CNTs adsorbed with Fe(NO3)3, followed by controlled phosphorization treatment. They exhibit an outstanding catalytic activity for oxygen evolution reaction (OER) with a low overpotential of 229 mV at a current density of 10 mA cm–2, a high turnover frequency value of 0.35 s–1 at an overpotential of 300 mV, and an ultralow Tafel slope of 27.6 mV dec–1, which is much better than that of FeP/Fe3O4, FeP/CNTs, Fe3O4/CNTs, and the commercial RuO2 electrocatalyst. More importantly, the Tafel slope is much lower than most non-noble metal-based OER electrocatalysts reported in the previous literature studies as far as we know. The excellent OER performance benefits from the electron transfer from Fe3O4 to FeP confirmed by X-ray photoelectron spectroscopy, together with good conductivity of CNTs. This hybrid structure supported on conductive CNTs may offer an efficient method to design earth-abundant and low-cost electrocatalysts for OER in practical applications.
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