ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 26
·25955-25966
·
IF 2.8
Ma Jiangya,Fu Xue,Jiang Liyan,Zhu Guocheng,Shi Jun
A novel magnetic flocculant (CPAMF) was synthesized by using Fe 3 O 4 coated with cationic polyacrylamide (CPAM) for flocculation of high turbid water. The surface morphology and chemical structures of CPAMF were confirmed by Fourier transform infrared spectroscopy (FTIR) and thermo-gravimetric analysis (TGA). X-ray diffraction (XRD) was employed to verify the crystal structure of CPAMF. The magnetic property of CPAMF was compared with Fe 3 O 4 in this study. The flocculation performance by using flocculants CPAMF was evaluated in high turbid water treatment. The maximum transmittance 92.4% of kaolin suspension was achieved at corresponding optimal flocculation conditions. The result indicated that CPAMF was efficient in high turbid water flocculation. Analysis of FTIR, XRD of flocs, and zeta potential (ZP) of supernatant were accomplished for flocculation mechanism investigation. Because of low recovery factor in reflocculation under the effect of shear force on flocs, the bridging effect was found to be dominant in both acidic and alkaline conditions. Sedimentation experiments under the role of permanent magnet indicated that nano-Fe 3 O 4 could effectively improve the settling property of CPAM.
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CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 7
·1043-1051
·
IF 1.401
Zhao Aixia,Xu Zhiqiang,Ma Liyi,Tian Zhenfeng,Gan Wuer
We report on the synthesis of Fe 3 O 4 @SiO 2 nanoparticles incorporated poly(divinylbenzene) monolithic column via in situ polymerization. The monolith had larger specific surface area and relatively uniform porous structure and was characterized by scanning electron microscopy, nitrogen adsorption–desorption, and Fourier transform infrared spectroscopy. The monolith was then applied for the evaluation of gas chromatography separation properties. Here, an electromagnetic induction heating technique was employed to control the column temperature with the thermal effect of eddy current in ferromagnetic materials Fe 3 O 4 . The monolith offered good separation efficiency for benzene and toluene and a higher column efficiency was obtained up to 4481 and 9216 plates per meter, respectively. In addition, the injection volume and column capacity of the proposed system are as much as 5 µL and 100 ng. This makes it possible to use a UV detector. The fabricated Fe 3 O 4 @SiO 2 nanoparticles incorporated poly(divinylbenzene) monolithic column has been shown to be very promising for gas chromatography separation. Graphical Abstract
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaohui Wang,Zhipeng Li,Yadan Ding,Kexin Wang,Zhenkai Xing,Xue Sun,Wanqiu Guo,Xia Hong,Xiaojuan Zhu,Yichun Liu
It is challenging and urgent in neurosurgery to improve therapeutic effect of the most common and lethal malignant glioma in central nervous system. The superadditive therapeutic effect of photothermal therapy and photodynamic therapy holds great promise. Herein, a highly efficient photothermal-photodynamic therapy nanoplatform was developed on the basis of Fe 3 O 4 -IR806 superparticles. The introduction of the near-infrared (NIR) dye IR806 and the fabrication of the self-assembled structure of the superparticles warrant 3.5 times increase in the photothermal conversion efficiency compared with the Fe 3 O 4 nanoparticles . The Fe 3 O 4 -IR806 superparticles generated reactive oxygen species (ROS) with the NIR light irradiation by virtue of the dye IR806. Both in vitro and in vivo experiments demonstrated that the Fe 3 O 4 -IR806 superparticles exhibited negligible toxicity. The Fe 3 O 4 -IR806 superparticles efficiently inhibited the cultured glioma cells via photothermal ablation and ROS cytotoxicity in vitro, as well as suppressed the bearing glioma growth in vivo with the NIR light induction. Our results highlight the promise of the Fe 3 O 4 -IR806 superparticles for improved photothermal-photodynamic therapy of cancer.
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Sustainable Energy & Fuels
·
2017
·Vol. 2
·期 3
·616-625
·
IF 0
Bin Xue,Tongtao Li,Biwei Wang,Li Ji,Dong Yang,Angang Dong
Rational design of nanostructured anode materials is of importance for promoting the performance of lithium ion batteries (LIBs). Here the Fe3O4 nanoparticles (NPs) were controllably inserted into the matrix of TiO2 nanorods (NRs) to obtain doped-superparticles (SPs) by a facile colloidal self-assembly route and subsequent calcination. To justify the effects of the doping, the lithium storage performances of the doped-SPs were evaluated as anode materials for LIBs. The results indicated that even a slight doping of Fe3O4 NPs can effectively enhance the properties of the anode materials compared with raw TiO2 NR SPs. Additionally, the Fe3O4/(TiO2)70 SPs showed an optimal performance in term of specific capacity, rate capacity, and cycling stability, whose reversible capacity maintained around 550 mA h g−1 at a current density of 1000 mA g−1 after 400 cycles. The highly enhanced lithium storage of the Fe3O4 NP doped-TiO2 NR SPs can substantially be attributed to the synergism of the doped-superstructure, in which the individual merits of the Fe3O4 NPs and TiO2 NRs are fully played out. This work not only demonstrates the significant effects of Fe3O4 NP doping for TiO2 NR SP anode materials in LIBs, but also opens an avenue for the self-assembly synthesis of doped-SPs with extended applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 4
·3922-3932
·
IF 2.741
Yi Xiaofeng,Yang Meixia,Mo Liuda,Xu Wenkai,Wang Shuai,He Jiarui,Gu Junjie,Ou Minrui,Xu Xiaoping
Copper in drinking water causes a significant environmental problem. Composite material based on alginate hydrogel has been gaining attention in the field of Cu(II) adsorption. However, alginate-based hydrogel exhibits poor mechanical property and relative low adsorption capacity which limit their application. The present study is devoted to the modification of chitosan/calcium alginate/Fe 3 O 4 (CAF) hydrogel microsphere by NaOH solution for enhancement of Cu(II) adsorption. Results reveal that modification of CAF via NaOH solution significantly improves the mechanical strength and Cu 2+ adsorption capacity of pristine materials. FTIR and XRD analysis confirms that CAF and newly prepared materials (NACAF) are successfully prepared. SEM and EDX are employed to analyze the surface morphology and elemental composition, respectively, both before and after their loading with Cu 2+ . XPS study demonstrates adsorption mechanism is based on chelation and ion-exchange. Compressive stress-strain curves demonstrate NACAF has better mechanical performance than CAF. The adsorption kinetics of the two adsorbents follow a pseudo-second-order model. The equilibrium data were best described by Langmuir isotherm model, and the estimated maximum equilibrium sorption capacity, q
m ,is 261.31 mg/g for the NACAF, which is larger than that of CAF (145.39 mg/g). Hence, NACAF shows excellent mechanical strength and high sorption capacity for Cu 2+ . It has great potential for Cu(II) removal in aqueous solutions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Dinglong Zhu,Shaomin Liu,Meiling Chen,Jianshu Zhang,Xiaoxiao Wang
A novel, magnetically separable, and stable Fe 3 O 4 /graphitic carbon nitride (g-C 3 N 4 ) nanocomposites were prepared using a facile method. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy. The photocatalysis capability and stability of the as-prepared samples were studied by the degradation of rhodamine B (RhB) under simulated sun irradiation. In addition, the degree of mineralization of RhB and the optimum conditions (pH and dosage of catalyst) for the reaction system were investigated. Tetracycline was used to remove the sensitization effect. Fe 3 O 4 /g-C 3 N 4 nanocomposites not only had higher photocatalytic activity but also obtained magnetic property and stronger stability, which are important for the reuse in water pollutant treatment. Photoelectrochemical activities of Fe 3 O 4 /g-C 3 N 4 were also investigated. The photocurrent enhancement indicates a higher separation efficiency of electrons and holes due to the heterojunction between Fe 3 O 4 and g-C 3 N 4 . RhB degradation improved under acidic conditions and simulated sun irradiation, given that more OH is produced because of the oxidation of Fenton. The h + is a main participant in the degradation of RhB. Active species analysis showed that dissolved oxygen plays an important role in the formation of reactive species ( O 2 − and OH), which are also important participants in the degradation of RhB.
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Water Research X
·
2024
·
IF 7.2
Dongdong Xu,Aqiang Ding,Yang Yu,Ping Zheng,Meng Zhang,Zhetai Hu
Magnetite (Fe 3 O 4 ) particles have been widely reported to enhance the anammox's activity in anammox granular sludge (AnGS), yet the underlying mechanisms remain unclear. This study demonstrates that both Fe 3 O 4 microparticles (MPs) and nanoparticles (NPs) at a dosage of 200 mg Fe 3 O 4 /L significantly increased the specific anammox activity (SAA) of AnGS. Additionally, the transcriptional activities of the hzs and hdh genes involved in the anammox process, as well as the heme c content in AnGS, were also notably enhanced. Notably, Fe 3 O 4 NPs were more effective than MPs in boosting anammox activity within AnGS. Mechanistically, Fe 3 O 4 MPs released free iron, which anammox bacteria utilized to promote the synthesis of key enzymes, thereby enhancing their activity. Compared to MPs, Fe 3 O 4 NPs not only elevated the synthesis of these key enzymes to a higher level but also induced a nanofluids effect on the surface of AnGS, improving substrate permeability and accessibility to intragranular anammox bacteria. Moreover, the nanofluids effect was identified as the primary mechanism through which Fe 3 O 4 NPs enhanced anammox activity within AnGS. These findings provide new insights into the effects of nanoparticles on granular sludge systems, extending beyond AnGS.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Xiaoqu Wang,Limin Wang,Yongchun Liu,Raj Kumar,Li Liu,Qiulan Huang,Dujuan Huang,You-Jun Fan,Du-Hong Chen,Wei Chen
For large-scale hydrogen production from electrocatalysis of water, the Ni- and/or Fe-based catalysts were commonly used but limited by the ultrahigh overpotential and poor stability at high current density (>500 mA cm−2). Here, the reconstruction of M(OH)x/Fe3O4 (M = Ni, Fe) arrays has been fabricated for boosting the oxygen evolution reaction (OER). The prepared M(OH)x/Fe3O4 grewon iron foam (M(OH)x/Fe3O4/IF) catalysts exhibited low overpotentials of 214 and 311 mV for OER at the current densities of 50 and 500 mA cm−2, respectively, besides the excellent stability up to 70 h of operation at a current density of 10 mA cm−2 in 1 M KOH. The in situ Raman spectra revealed that, the reconstruction of M(OH)x/Fe3O4/IF boosted the OER activity. Theoretical calculation revealed favorable absorption of O2 at Ni site of M(OH)x/Fe3O4/IF during OER. This work highlights the reconstruction structurally definite catalysts for promoting the catalytic activity toward OER and the large-scale electrocatalysis of water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Haixia Wang,Yehong Zhou,Yujing Guo,Wenjuan Liu,Chuan Dong,Yuehuan Wu,Songdong Li,Shaomin Shuang
A glassy carbon electrode (GCE) was first modified with β-cyclodextrin functionalized Fe 3 O 4 magnetic nanoparticles (β-CD-MNPs), which was fabricated by the combination of 3-aminopropyl triethoxysilane coated magnetic Fe 3 O 4 nanoparticles (APTES-MNPs) with 6-O-toluenesulfonyl-β-cyclodextrin (6-TsO-β-CD). The β-CD-MNPs grafting was confirmed by TEM, FTIR and thermogravimetric analysis (TGA). Electrochemical behaviors of tryptophan (Trp) at the β-CD-MNPs modified electrode were confirmed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), which indicated that β-CD-MNPs efficiently improved the electron transfer between solution and electrode interface. Some parameters, including pH of electrolyte, the amount of β-CD-MNPs and scan rate of voltammetric sweeping segments have been optimized. Under the optimum conditions, the oxidation peak current displayed a calibration response for tryptophan over a wide concentration range from 8.0 × 10 −7 to 3.0 × 10 −4 M with a detection limit of 5.0 × 10 −7 M (S/N = 3). The relative standard deviation (RSD) of 8 successive scans was 4.2% for 1.0 × 10 −4 M tryptophan. The proposed procedure was successfully applied to the determination of tryptophan in a commercial amino acid injection.
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MOLECULES
·
2024
·Vol. 29
·期 10
·2311
·
IF 4.2
Ling Yu,Aiqing Xia,Yongchao Hao,Weitao Li,Xu He,Cuijuan Xing,Zan Shang,Yiwei Zhang
Pyrethroid pesticides (PYRs) have found widespread application in agriculture for the protection of fruit and vegetable crops. Nonetheless, excessive usage or improper application may allow the residues to exceed the safe limits and pose a threat to consumer safety. Thus, there is an urgent need to develop efficient technologies for the elimination or trace detection of PYRs from vegetables. Here, a simple and efficient magnetic solid-phase extraction (MSPE) strategy was developed for the simultaneous purification and enrichment of five PYRs in vegetables, employing the magnetic covalent organic framework nanomaterial COF-SiO2@Fe3O4as an adsorbent. COF-SiO2@Fe3O4was prepared by a straightforward solvothermal method, using Fe3O4as a magnetic core and benzidine and 3,3,5,5-tetraaldehyde biphenyl as the two building units. COF-SiO2@Fe3O4could effectively capture the targeted PYRs by virtue of its abundant π-electron system and hydroxyl groups. The impact of various experimental parameters on the extraction efficiency was investigated to optimize the MSPE conditions, including the adsorbent amount, extraction time, elution solvent type and elution time. Subsequently, method validation was conducted under the optimal conditions in conjunction with gas chromatography–mass spectrometry (GC-MS). Within the range of 5.00–100 μg·kg−1(1.00–100 μg·kg−1for bifenthrin and 2.5–100 μg·kg−1for fenpropathrin), the five PYRs exhibited a strong linear relationship, with determination coefficients ranging from 0.9990 to 0.9997. The limits of detection (LODs) were 0.3–1.5 μg·kg−1, and the limits of quantification (LOQs) were 0.9–4.5 μg·kg−1. The recoveries were 80.2–116.7% with relative standard deviations (RSDs) below 7.0%. Finally, COF-SiO2@Fe3O4, NH2-SiO2@Fe3O4and Fe3O4were compared as MSPE adsorbents for PYRs. The results indicated that COF-SiO2@Fe3O4was an efficient and rapid selective adsorbent for PYRs. This method holds promise for the determination of PYRs in real samples.
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TALANTA
·
2024
·
IF 5.6
Qiulan Li,Jitao Li,Yang Jiao,Xiaolan Yang,Dezhi Yang,Zitao Zhong,Yaling Yang
The pathogenic bacteria induced foodborne disease has been detrimental to public health worldwide. Herein, the peroxidase (POD)-like Fe 3 O 4 /MWCNTs@Mo-CDs (FMMC) nanozyme was applied for the detection of Escherichia coli ( E. coli ). The E. coli aptamer was conjugated with the surface of the FMMC, which effectively enhanced the POD-like activity attributing to the higher affinity to the substrate, and then specific capture of E. coli in food matrices, leading to the reduction of POD-like activity. Therefore, a robust and facile colorimetric aptasensor was developed for detecting E. coli with a wide linear range of 10 1 –10 6 CFU/mL, low LOQ of 10 1 CFU/mL and LOD of 0.978 CFU/mL. The aptasensor demonstrated the satisfied selectivity for E. coli compared to the other strains. This method possessed the potential application for fast in situ screening of foodborne pathogens in food products.
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Journal of the Taiwan Institute of Chemical Engineers
·
2015
·
IF 3
Zhuoxing Wang,Jiang Xu,Yunjun Hu,Heng Zhao,Junliang Zhou,Yu Liu,Zimo Lou,Xinhua Xu
A selective adsorbent for Hg(II) was prepared by coating Fe 3 O 4 nanoparticles with SiO 2 which was further functionalized with thiol (–SH) group. The new adsorbent (Fe 3 O 4 @SiO 2 -SH) was shown to adsorb aqueous Hg(II) species in a wide range of pH (1.0–8.0) conditions. The Hg(II) adsorption capacity q e was more than 90.0 mg g −1 at pH > 3.0, and was slightly decreased to 84.6 mg g −1 under strong acidic conditions due to the electrostatic repulsion. The Langmuir isotherm model fitted the adsorption data better than the Freundlich, Temkin, and Dubinin-Radushkevich isotherms models. The maximum adsorption capacity of Fe 3 O 4 @SiO 2 -SH for Hg(II) was 132.0 mg g −1 . The adsorption kinetics were shown to follow the pseudo-second-order kinetic model, and the kinetic constant k 2 was 2.4 × 10 −3 g mg −1 min −1 . The magnetic retrieve of the newly-developed adsorbent was easily carried out via an external magnetic field, enabling both excellent adsorbent utilization and adsorption efficiency at high Hg(II) concentrations.
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