JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2019
·
IF 4.865
Juan Tang,Jie Wang,Hui Jia,Haitao Wen,Juan Li,Wenbin Liu,Jingyu Li
For the low-concentration oily micro-polluted water formed by the leakage of refined oil products, an unexpensive and high-efficiency magnetic enhanced flocculation method was introduced in this study. First, the performance of magnetic flocculation(MF) to remove oily contaminants was discussed. The results indicated that it achieved more than 95% removal in only 1min with 50mg/L-Polyaluminum chloride(PAC), 50mg/L-Fe 3 O 4 and10mg/L- Polyacrylamide (PAM). The novel indexs R δ and S i were proposed to evaluate the oil removal with UV-Abs in-situ method. According to the adsorption kinetics of oil contaminants, the adsorption kinetics changed from pseudo-first-order to pseudo-second-order kinetics after the addition of Fe 3 O 4 on the basis of conventional coagulation (CF). It was transformed into intraparticle diffusion kinetics when the PAM continued to be added. Combined with the Fe–O–Al bond in the FTIR spectrum of flocs, the main mechanism of MF is enhanced charge neutralization and hydrogen bond adsorption. In addition, it was shown that satisfactory oil removal after recover, which indicated the great potential of a sustainable way by reusing low-cost magnetic seeds.
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MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Zhi Zhang,Yueping Guan,Guoli Xu,Chen Guo
In this submission, a novel washing-free immunosensor was designed for chemiluminescence immunoassay (CLIA) of tumor marker using human Alpha-fetoprotein (AFP) as a representative. Reactive groups were introduced on the surface of the solvothermally prepared Fe 3 O 4 magnetic submicron particles (MSPs) and the dual-functional polyethylene glycol (PEG) linkers were modified to reduce the non-specific adsorption capacity of the particle surface and further to immobilize N -(4-aminohexyl)- N -ethylisoluminol (AHEI) and anti-AFP antibody on the surface of the particles. After incubation with AFP and horseradish peroxidase (HRP) labeled anti-AFP antibody respectively, the formed sandwich-type immunocomplexes on the particle surface could lead to the close proximity between AHEI and HRP, thus eventually leads to an increase in the detected chemiluminescence (CL) signal. As a bound HRP labeled anti-AFP antibody produces much stronger CL signal than an unbound one, this approach eliminates the time- and labor-consuming washing steps usually required of such assays. Under the optimal conditions, this present method shows a wide quantitative range from 1 to 250 ng mL −1 with a detection limit of 1.751 ng mL −1 . The detection limit was sufficient for measuring physiological (0–20 ng mL −1 ) and clinical (>20 ng mL −1 ) AFP levels. This method can also be applied in serum samples, and also avoid the problem of particle aggregation caused by multiple separation and washing steps.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Yanlin Li,Wenyuan Duan,Xuegang Lu,Sen Yang,Xiaoxiang Wen
Well-defined Fe 3 O 4 @SiO 2 composite colloidal particles decorated with Ag nanoparticles were successfully synthesized through a simple chemical approach. These particles self-assembled into 1D chain-like photonic structures under the induction of magnetic field and diffract tunable structural colors. The hue and brightness of the structural colors are related to Ag nanoparticles deposited on the particles surface and its brightness increases with the increase of Ag concentration. This phenomenon could be the result of the superposition of photonic bandgap formed by photonic crystals and possible plasmonic property, as well as capability in absorbing stray light of Ag nanoparticles. As-prepared Fe 3 O 4 @SiO 2 @Ag colloidal particles have great potential to be applied in many crucial areas such as color displaying, biological detection and anti-counterfeiting technology.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2018
·Vol. 33
·期 3
·559-565
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IF 0.524
Guo Huiling,Sun Honghao,Su Zhengding,Hu Shuchao,Wang Xiaotao
A facile approach has been developed to synthesize Fe 3 O 4 @PAM (polyacrylamide) nanoparticles (NPs) with carboxyl groups on the surfaces by copolymerization with acrylamide and acrylic acid in Fe 3 O 4 NPs aqueous suspension. Nitrilotriacetic acid (NTA) was conjugated to the magnetic NPs via well-known carboniimide chemistry using EDC and NHS. The Ni 2+ ions loaded on the surface of NPs provide abundant docking sites for immobilization of His-tagged green fluorescent proteins (His-tagged GFP). The high magnetic property of Fe 3 O 4 @PAM@NTA-Ni 2+ allows an easy separation of the NPs from solution under an external magnetic field, with high His-tagged protein binding capacity (42 μg protein/mg of NPs). The NPs can be recycled for at least four times without significant loss of binding capacity to proteins. These materials show great potential to separate His-tagged protein with low-cost purification at industrial scale.
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JOURNAL OF LUMINESCENCE
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2018
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IF 2.732
Nengtao Wu,Yiping Tang,Min Zeng,Jinwei Gao,Xubing Lu,Yuhui Zheng
An efficient way to assemble Fe 3 O 4 @SiO 2 -NH 2 nanocomposite has been developed by coupling (3-aminopropyl)trimethoxysilane onto surface of core-shell structure through facile impregnation of Fe 3 O 4 @SiO 2 decorated with amino groups. The key step during the synthesis involves the incorporation of organic fluorophore and amines are treated with 1,8-naphthalic anhydride. The achieved hybrid inorganic-organic nanoparticle gives rise to blue emissions and shows enough stability. Furthermore, Cu 2+ can be recognized by the organic building block via coordination reaction and the “on-off” quenching effect is observed. The nanosensor provides a response concentration range (1–6 μM) to Cu 2+ with the detection limit of 0.65 μM. Owing to the magnetic properties , the hybrid nanoprobe can be easily retrieved from aqueous solution for repeated uses via magnetic separation (35 s). This approach will offer an alternative way for designing novel detection systems in biological related fields.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 6
·4114-4120
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IF 1.354
Huang Zhen,Ge Heyi,Wu Jiaming,Chen Juan
RGO (reduced graphene oxide)-Fe3O4 nanohybrids were successfully synthesized by a solvothermal reduction method. Fe3O4 nanoparticles, RGO and the nanohybrids were characterized using scanning electron microscopy (SEM), transmission electron
microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and vibrating sample magnetometer (VSM). The electromagnetic interference (EMI) shielding effectiveness (SE) of RGO-Fe3O4/SF/PP composite was much higher than that of Fe3O4/SF/PP composite
at 8–12 GHz, which was attributed to synergistic effect between RGO and Fe3O4 nanoparticles. The EMI SE (%) improved with the increase of RGO-Fe3O4 content and the maximum value of 80.44% was obtained for the RGO-Fe3O4/SF/PP
composite. Furthermore, the dominant shielding mechanism of RGO-Fe3O4/SF/PP was absorption.
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JOURNAL OF SEPARATION SCIENCE
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2018
·Vol. 41
·期 13
·2837-2845
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IF 2.415
Xin Li,Xiaoguo Ma,Renfeng Huang,Xiaowen Xie,Lihui Guo,Mengyuan Zhang
Atrazine contamination of water is of considerable concern because of the potential hazard to human health. In this study, a magnetic molecularly imprinted polymer for atrazine was prepared by the surface-imprinting technique using Fe 3 O 4 as the core, mesoporous silica as the carrier, atrazine as the template, and itaconic acid as the functional monomer. The magnetic molecularly imprinted polymer was characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and vibration-sample magnetometry. The binding properties of the magnetic molecularly imprinted polymer toward atrazine were investigated by adsorption isotherms, kinetics, and competitive adsorption. It was found that the adsorption equilibrium was achieved within 2 h, the maximum adsorption capacity of atrazine was 8.8 μmol/g, and the adsorption process could be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The magnetic molecularly imprinted polymer exhibited good adsorption selectivity for atrazine with respect to structural analogues, such as cyanazine, simetryne, and prometryn. The reusability of the magnetic molecularly imprinted polymer was demonstrated for at least five repeated cycles without a significant decrease in adsorption capacity. These results suggested that the magnetic molecularly imprinted polymer could be used as an efficient material for the selective adsorption and removal of atrazine from water samples.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Haijun Liu,Caizhen Liang,Jianjun Chen,Yuewen Huang,Fei Cheng,Fubin Wen,Bingbing Xu,Bin Wang
In this work, a novel and facile technique, epoxy-water-inorganic filler suspended emulsion polymerization , was proposed to fabricate 3D network porous graphene nanoplatelet (GNP)/Fe 3 O 4 /epoxy nanocomposites with low density of 0.34–0.73 g/cm 3 . The obtained porous nanocomposite with 7 wt% graphene nanoplatelets and 7 wt% Fe 3 O 4 nanoparticles loading exhibited satisfactory specific electromagnetic interference (EMI) shieling effectiveness of ∼37.03 dB/(g/cm 3 ), which was much higher than that of the solid counterparts (28.30 dB/(g/cm 3 )). In addition, the porous GNP/Fe 3 O 4 /epoxy nanocomposites also possessed outstanding thermal stability and mechanical property, which makes it a potential EMI shielding material in the fields of aerospace and electronic industries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
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.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhangxu Chen,Ming-Lai Fu
To extend the activities of TiO 2 to the near infrared (NIR) region and to separate and recycle photocatalysts easily is vital for the high harvest of solar energy for sustainable society. The magnetic NIR activated Fe 3 O 4 @SiO 2 /β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 (FS/UC/T) composites have been synthesized by using the solvothermal method by adding Fe 3 O 4 @SiO 2 and Degussa P25 into the mixed solution of NaOH, ethanol, oleic acid, Re(NO 3 ) 3 and NH 4 F. Moreover, the obtained composites were explored for photocatalytic applications. It was found that FS/UC/T emit UV–vis light under irradiation of 980 nm laser and efficient energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photodegradation experiments for treating methylene blue (MB), rhodamine B (RhB), methyl orange (MO) and colorless phenol were carried out to evaluate the photocatalytic activities of the samples. The photodegradation rates reach 76.62%, 68.48%, 30.05% and 27.16% for MB, RhB, MO and phenol under irradiation of 980 nm laser, respectively, which suggested magnetic FS/UC/T composite is an advanced NIR-driven photocatalyst. Moreover, the magnetic photocatalyst showed easy separation and good stability in the recycled tests. It suggested a promising system to utilize the NIR energy for photocatalysis based on TiO 2 and to utilize the magnetic for separation of photocatalysts, which will contribute to practical environmental remediation in the future.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 21
·14907-14921
·
IF 2.993
Pang Jiafeng,Li Zhixian,Li Shaomin,Lin Shuying,Wang Hongdi,Xie Qiuling,Jiang Yanbin
Integrating various functional components into a single nano-platform is an ideal but challenging strategy for cancer therapy. Herein, a facile approach to fabricating multi-targeted nano-drug delivery systems which can be monitored is reported. Superparamagnetic iron oxide nanoparticles (SPIONs) and gefitinib (GEF) were encapsulated into folic acid-conjugated zein (Fa–zein) nanocomplexes (GEF-FSZs) with good dispersity, high GEF loading efficiency and pH-dependent release profile. The uptake of water-insoluble GEF was facilitated by encapsulating GEF into a zein-based nanocomplex, the magnetic responsive property endowed by SPIONs and the conjugation of Fa, which resulted in enhanced toxicity to A549 cells. The endocytosis study indicated that macropinocytosis and clathrin/caveolae-independent endocytosis exerted great influence on the internalization of GEF-FSZs. These results implied that GEF-FSZs could be a promising candidate for controlled and targeted drug delivery.
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RSC Advances
·
2019
·Vol. 9
·期 41
·23545-23553
·
IF 3.049
Jianhui Li,Fan Yang,Quan Zhou,Lijie Wu,Wenying Li,Ruipeng Ren,Yongkang Lv
The ternary magnetic Fe3O4/BiOBr/BiOI (x : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) is superior to other Fe3O4/BiOBr/BiOI (x : 3 : 1). Compared with binary magnetic Fe3O4/BiOBr (0.5 : 1) prepared in our previous work, the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) has obvious advantages in photocatalytic activity and adsorption capacity. And the specific surface area (48.30 m2 g−1) is much larger than that of the previous report (Fe3O4/BiOBr/BiOI (0.5 : 2 : 2)) synthesized by a co-precipitation method. Besides, after 25 s of magnetic field, Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) can be rapidly separated from water. After eight recycling cycles, the magnetic properties, photocatalytic activity, crystallization and morphology of the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) catalyst remain good. The possible photocatalytic degradation mechanism of RhB under Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) photocatalyst was also proposed. The results indicate that the ternary magnetic Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) composite with high photocatalytic degradation efficiency, good magnetic separation performance and excellent recyclability and stability has potential application prospect in wastewater.
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