E-POLYMERS
·
2022
·Vol. 22
·期 1
·488-504
·
IF 3.074
Fangsheng Wu,Zihua Zhang,Wei Liu,Yuan Liu,Xiujuan Chen,Pingyong Liao,Qiaoying Han,Lun Song,Hong Chen,Wenbin Liu
In this study, a novel material of core–shell structured magnetic molecularly imprinted polymers (Fe 3 O 4 @SiO 2 @Au (FSA)-MIPs) was successfully prepared for the rapid and selective determination of 4-methylmethcathinone (mephedrone, 4-MMC). The adsorption capacity of FSA-MIPs is 34.7 mg·g −1 at 308 K, which is significantly higher than magnetic non-imprinted polymers profiting from the imprinting effect. The FSA-MIPs have a short equilibrium (20 min) and could be reused more than six times. Moreover, the selectivity coefficients of FSA-MIPs for 4-MMC, 3,4-dimethylmethcathinone, butylone, 4-ethylmethcathinone, acetylfentanyl, and methylene blue are 4.01, 5.65, 7.62, 12.30, and 20.87 respectively, further indicating the markedly enhanced binding selectivity of FSA-MIPs. As an adsorbent, the FSA-MIPs were successfully applied for effective extraction of 4-MMC in three human urine samples with the recovery rates ranging from 85.5–92.6%. The results confirmed that the FSA-MIPs have good prospects in the extraction and separation of synthetic cathinones, which is suitable for further application in the criminal sciences field.
研究领域:
分析化学
·
法医学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 34
·期 2
·238-248
·
IF 1.114
Li Yan-ni,Hu Yan-yun,Ding Lei,Zhou Dian-bing,Chen Wen-jun
Residues of tetracycline antibiotics (TCs) in environments may be harmful to human. Due to their high polarities, it is extremely challenging to efficiently enrich TCs with low concentrations in natural waters for analysis. In this work, a magnetic metal-organic framework Fe 3 O 4 @[Cu 3 (btc) 2 ] was synthesized and applied as a dispersive micro-solid phase extraction adsorbent for TCs enrichment. Effects of dispersive micro-solid phase extraction conditions including extraction time, solution pH, and elution solvent on the extraction efficiencies of TCs were investigated. Results show that TCs could be enriched efficiently by Fe 3 O 4 @[Cu 3 (btc) 2 ], and electrostatic interaction between TCs and Fe 3 O 4 @[Cu 3 (btc) 2 ] dominated this process. Combined with liquid chromatography-tandem mass spectrometry, four TCs residues (oxytetracycline, tetracycline, chlortetracycline, and doxycycline) in natural waters were determined. The detection limits (LOD, S/N = 3) of the four antibiotics were 0.01–0.02 µg/L, and the limits of quantitation (LOQ, S/N = 10) were 0.04–0.07 µg/L. The recoveries obtained from river water and aquaculture water spiked with three TCs concentration levels ranged from 70.3% to 96.5% with relative standard deviations of 3.8%–12.8%. Results indicate that the magnetic metal-organic framework based dispersive micro-solid phase extraction is simple, rapid and high-loading for antibiotics enrichment from water, which further expand the practical application of metal-organic frameworks in sample pretreatment for environmental pollutant analysis.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Jiahong Wang,Min Mao,Saleem Atif,Yao Chen
The presence of widely used chelating agents such as ethylenediaminetetraacetic acid (EDTA) in aqueous solution increases the difficulty of heavy metal removal by the formation of heavy metal chelates. In this study, diethylenetriaminepentaacetic acid (DTPA)-chitosan functionalized magnetic silica (Fe 3 O 4 @SiO 2 /Cs-DTPA) was developed for the removal of Cr(III) and Cr(III)-EDTA. The obtained results from characterization confirmed that Fe 3 O 4 @SiO 2 /Cs-DTPA with the core-shell structure and superparamagnetic properties was synthesized. The maximum theoretical adsorption capacity of Cr(III) and Cr(III)-EDTA chelates on the adsorbents were 39.27 and 22.24 mg/g at 25 °C and pH 4.0, respectively. Adsorption equilibrium of Cr(III) and Cr(III)-EDTA on Fe 3 O 4 @SiO 2 /Cs-DTPA was achieved within 15 min, and the adsorption data fit the pseudo second-order model. The co-existing complex agents (EDTA) and cations (Na + , Ca 2+ , and Mg 2+ ) in the aqueous solution reduced Cr(III) adsorption by the competition with Cr(III) and Cr(III)-EDTA chelate for active groups of the adsorbent. The affinity of the Fe 3 O 4 @SiO 2 /Cs-DTPA for Cr(III) and Cr(III)-EDTA was excellent even at high salt and organic chelates concentration. The Cr(III) adsorption was attributed to surface complexation between Cr(III) and DTPA moieties of the adsorbent, while Cr(III)-EDTA as a whole was adsorbed on the adsorbent by the complexation and electrostatic interaction . Cr(III) saturated Fe 3 O 4 @SiO 2 /Cs-DTPA can be readily regenerated in acid solution and Cr(III) or Cr(III)-EDTA adsorption of regenerated adsorbent exhibits no obvious reduce.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Zhejiang University-SCIENCE A
·
2015
·Vol. 16
·期 8
·669-679
·
IF 0.882
Shan Jie,Wang Li,Yu Hao-jie,Tai Yu-lei,Akram Muhammad
Porous polymers are very suitable materials for the adsorption of organic pollutants due to their abundant pores and organic frameworks in aqueous solution. However, their recovery from treated pollutant is difficult, and thus, their application is limited. A facile strategy to synthesize reusable magnetic porous microspheres (MPMS) of Fe 3 O 4 /poly(methylmethacrylate (MMA)- co -divinylbenzene (DVB)) is described in this paper. The magnetic microspheres were synthesized by suspension copolymerization. MMA was used as a monomer, DVB was used as a crosslinker, and the magnetic fluid was added to the organic phase. The morphology of MPMS was observed by scanning electron microscope (SEM) and other properties were tested by superconducting quantum interference device, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), and nitrogen sorption-desorption techniques. The synthesized MPMS possessed a high specific surface area using toluene as a porogen. It was further found that the ratio of DVB to MMA, the ratio of porogen to monomer, and the type of porogen all affected the specific surface area and the morphology of the microspheres. Furthermore, the microspheres were applied to remove Rhodamine B from its aqueous solution. The results showed that the microspheres possessed good adsorption capacity for Rhodamine B. This result was due to the porous structure, polar groups, and superparamagnetic characteristic of the synthesized microspheres.
研究领域:
材料科学
·
环境化学
·
高分子化学
·
吸附分离
·
功能材料
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Zhou Yang,Yuan Shaofei,Liu Qian,Yan Dandan,Wang Yun,Gao Li,Han Juan,Shi Haifeng
In this paper, an efficient and convenient Fe 3 O 4 /PMG/IDA-Ni 2+ nanoparticles that applied to purify and immobilize his-tagged β-glucosidase was synthesized, in which, Fe 3 O 4 /PMG (poly ( N, N’- methylenebisacrylamide-co-glycidyl methacrylate) core/shell microspheres were synthesized firstly using distillation-precipitation polymerization, then iminodiacetic acid (IDA) was used to open epoxy rings on the shell of microspheres to the combination of Ni 2+ . The gene of β-glucosidase that was from Coptotermes formosanus Shiraki was amplified, cloned into the expression vector pET28a with an N-terminal His-tag, and expressed in E.coli BL21. The nanoparticles showed the same purification efficiency as commercial nickel column which was a frequently used method in the field of purifying his-tagged proteins from crude cell lysates. The results indicated that Fe 3 O 4 /PMG/IDA-Ni 2+ nanoparticles can be considered as an excellent purification material. β-glucosidase was immobilized on the surface of Fe 3 O 4 /PMG/IDA-Ni 2+ to form Fe 3 O 4 /PMG/IDA-β-glucosidase by means of covalent bound with imidazolyl and Ni 2+ . The immobilized β-glucosidase exhibited excellent catalytic activity and stabilities compared with free β-glucosidase. In addition, immobilized β-glucosidase can be recycled for many times and retain more than 65% of the original activity. The materials display enormous potential in the aspect of purifying and immobilizing enzyme.
研究领域:
生物化学
·
生物技术
·
酶学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Biomedical Nanotechnology
·
2009
·Vol. 5
·期 5
·505-510
·
IF 0.989
Li Zhiyang,He Lei,Shi Zhiyang,Wang Hua,Li Song,Liu Hongna,Wang Zhifei,He Nongyue
This paper described that Fe3O4 nanoparticles were encapsulated with methyl methacrylate (MMA) using linolenic acid (LA) as a crosslinking agent, after which the resulting polymethyl methacrylate (PMMA) embed Fe3O4 nanoparticles (PMMA/Fe3O4) were coated with silica, forming SiO2/(PMMA/Fe3O4) core–shell structure particles. Then these magnetic nanoparticles (MNPs) were applied in the developed system of chemiluminescent magnetic enzyme-linked immunoassay. E. coli O157:H7 was sandwiched between rabbits anti-E. coli O157:H7 polyclonal antibody-coated magnetite nanoparticles (immunomagnetic nanoparticles or IMNPs) and mouse anti-E. coli O157:H7 monoclonal antibody (E. coli O157-McAb). Commercial alkaline phosphatase conjugated horse anti-mouse immunoglobulin (ALP-Ab) was used to bond with the monoclonal antibody, finally the chemiluminescent signals were detected by adding 3-(2′-spiroadamantane)-4-methoxy-4-(3″-phosphoryloxy)phenyl-1,2-dioxetane (AMPPD) which was the substrate reagent of ALP. The specificity and sensitivity of this system for detecting E. coli O157:H7 were researched. The results indicated that this method was of good specificity when using E. coli Top 10F′ and Vibrio cholera as negative controls. The detection limit was 103 cells mL−1 when the antigen solution was 1 mL, and the procedure duration was about 3 h.
研究领域:
材料科学
·
纳米技术
·
生物技术
·
分析化学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Wuming Xie,Fengping Zhou,Xiaolin Bi,Dongdong Chen,Zijun Huang,Yuhui Li,Shuiyu Sun,Jingyong Liu
Nickel (Ⅱ)−ethylenediaminetetraacetic acid (Ni−EDTA) complexes are widely present in electroplating effluents. Owing to its chemical stability, Ni−EDTA is hardly removed in traditional Fenton/Fenton-like processes with conventional iron (Fe)−based catalyst. In this study, oxygen vacancies were introduced into our highly efficient and novel Fe 3 O 4 @γ−Al 2 O 3 catalysts using Cu doping for Ni−EDTA decomposition in Fenton−like system. Without noble−metal cocatalyst, the introduction of oxygen vacancies in Cu−doped Fe 3 O 4 @γ−Al 2 O 3 catalysts exhibit excellent Fenton−like activity even in neutral or alkaline conditions. Experimental results revealed that, without the aid of extra energy, Ni−EDTA complexes could be effectively decomposed over oxygen vacancies−based catalyst. Electron paramagnetic resonance (EPR), X−ray photoelectron spectroscopy (XPS), oxygen temperature−programmed desorption (O 2 −TPD), and hydrogen temperature−programmed reduction (H 2 −TPR) were used to get a deep insight into the decomposition mechanism. Additionally, by employing the Al−containing support, stable layered double−hydroxide phases of Ni Al could be formed, indicating that a synergy of oxidation and adsorption could simultaneously take place, which led to the recovery of released Ni 2+ ions and also reduction in secondary pollution. To investigate the decomposition process of Ni−EDTA over oxygen vacancies−based catalyst, liquid chromatography−quadrupole/electrostatic field orbitrap high resolution mass spectrometry (LC−MS/MS) was employed to identify the generated intermediates, and thus, a plausible decomposition pathway was successfully conceived.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 33
·13915-13925
·
IF 2.562
Leyong Zeng,Lingchao Xiang,Wenzhi Ren,Jianjun Zheng,Tianhua Li,Bin Chen,Jichao Zhang,Chengwen Mao,Aiguo Li,Aiguo Wu
Due to non-invasive deep imaging and therapy, multifunctional agents of magnetic resonance (MR)/upconversion luminescence (UCL) imaging and photodynamic therapy (PDT) play an important role in clinical diagnosis and treatment of cancers, and also in the assessment of therapy effect. In this paper, tetra-sulfonic phthalocyanine aluminium (AlPcS4) photosensitizers-conjugated Fe3O4@NaYF4:Yb/Er (NPs-AlPcS4) nanocomplexes were synthesized for the T2-weighted MR/UCL imaging and PDT of cancer cells. The PEG-coated Fe3O4@NaYF4:Yb/Er nanoparticles (NPs) with a core–shell structure showed strong T2-weighted MR relaxivity (r2 = 42.131 mM−1 s−1) and UCL emission in the visible region (the bands at about 654–674 nm, 545 nm and 524 nm), and were conjugated successfully with AlPcS4 photosensitizer by electrostatic interaction. By direct observation of XFM and staining with Prussian blue, the element distribution and location of NPs in MCF-7 cells were characterized, respectively. Under irradiation from a 980 nm laser, the death ratio of MCF-7 cells incubated with NPs-AlPcS4 nanocomplexes could be up to about 70%. The results indicated that the as-prepared NPs-AlPcS4 nanocomplexes would be a potential candidate as multifunctional nanoprobes for the dual-modal T2-weighted MR/UCL imaging and PDT of cancers in the future.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
·
影像医学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Liu-Yang Sun,Lie Yang,Jing Li,R. Lakshmi Narayan,Xiao-Hui Ning
Iron oxide , a promising anode material for lithium ion batteries, has a high theoretical specific capacity but exhibits poor cycling performance and rate capability. To resolve these issues, 150 nm sized carbon coated, hollow Fe 3 O 4 nanoellipsoids are designed in this study. Owing to the relatively high utilization ratio of Fe 3 O 4 and the buffer provided by the carbon layer, this composite has enhanced lithium ion storage properties and long cycle life. From half-cell measurements, the capacity is found to be in excess of 400 mAh g −1 even after 1000 cycles at 5 A g −1 . And then, a facile and practical strategy is used to gain a relatively high compressed density (∼1.87 g cm −3 ), so the volumetric capacity of the Fe 3 O 4 @C electrode can be further enhanced by subjecting it to compression. In the full cell test, the Fe 3 O 4 @C electrode has a specific capacity of 400 mAh g −1 and volumetric capacity of 749 mAh cm −3 after 100 cycles. The improvement in cycling stability can be attributed to minimal volume expansion and the stability of the solid-electrolyte interphase (SEI) layer, over the nanoparticles . Finally, the evolution of solid-electrolyte interphase layer is indirectly monitored and the progressive loss of active lithium is quantitatively measured.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 60
·37929-37937
·
IF 3.108
Yang Luo,Sinan Du,Wei Zhang,Zhengfang Liao,Fang Zuo,Shengtao Yang
Core@shell structures of Fe3O4@Mn2+-doped NaYF4:Yb/Tm nanoparticles (NPs) with multifunctional properties were prepared using a hydrothermal route with a seed-growth procedure. The effect of Mn2+ ions on the phase, shape, and upconversion luminescence (UCL) of Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs was explored using X-ray diffraction, transmission electron microscopy, dynamic light scattering, and photoluminescence spectroscopy. Furthermore, hydrophobic to hydrophilic surface modification of the Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs was achieved by coating the NPs with an amphiphilic polymer (poly(maleic anhydride-alt-1-octadecene) (C18PMH)) modified with amine-functionalized methyl ether poly(ethylene glycol). Then, the NIR-to-NIR UCL ascribed to the Tm3+ ions, T1-weighted MRI ascribed to the Mn2+ ions, and T2-weighted MRI ascribed to the Fe3O4 core of the hydrophilic Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs were evaluated. The results indicate that Mn2+ doping is an effective method to control the size/shape and improve the UCL intensity of Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs, which are promising as imaging agents for NIR-to-NIR UCL and T1/T2-weighted MRI in biomedical research.
研究领域:
生物医学工程
·
材料科学
·
影像医学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuan Zhuang,Siyi Yuan,Jiemin Liu,Yan Zhang,Hao Du,Chuandong Wu,Peng Zhao,Haiying Chen,Yipu Pei
Volatile organic compound (VOC) emissions are a global environmental concern because of their potential health risks. The removal of refractory VOCs calls for advanced technologies with powerful oxidative ability and high mass transfer efficiency. In this study, a yolk-shell Fe 3 O 4 @C/Fenton system was designed to improve octane removal efficiency. The octane removal efficiency at equilibrium was increased by 24.7% relative to that of the Fe 3 O 4 /Fenton system, and the main intermediate or byproduct levels decreased by 89.4%. The yolk-shell Fe 3 O 4 @C displayed higher catalytic and mass transfer efficiencies for octane degradation than Fe 3 O 4 . A synergistic effect of mass transfer enhancement and catalytic oxidation was observed in the yolk-shell Fe 3 O 4 @C/Fenton system. The mechanism of the synergistic effect of mass transfer and octane degradation, a regional reaction theory for the yolk-shell structure, and octane removal pathways were proposed and supported by the octane removal results and byproducts detection and measurement. This yolk-shell Fe 3 O 4 @C/Fenton system provides an effective and advanced way to treat refractory and hydrophobic VOCs, and its preparation can be extended to other high-efficiency core-shell structure catalyst-carbon materials.
研究领域:
环境科学
·
化学工程
·
材料科学
·
催化
·
污染控制
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 40
·405602
·
IF 3.5
Tiantian Si,Shuai Xie,Zhijiang Ji,Zihao Wu,Chao Ma,Junyu Wu,Jing Wang
The development of practical and efficient electromagnetic wave (EMW) absorbing materials is a challenging research problem. A mussel-inspired molecular structure regulation strategy using polydopamine to increase the roughness and functional groups of basalt fiber (BF) surface, which can improve the fiber interfacial adhesion. Herein, a novel BF-Fe3O4/CNTs heterostructure is synthesized through a dip-coating adsorption process. The three-dimensional network structure of Fe3O4/CNTs hybrid in situ anchored on the surface of BF, which endows the composite to have good intrinsic magnetic and dielectric properties. Modulation of EMW absorption performance by controlling the addition of CNTs, the minimum RL of BF-Fe3O4/7C reaches to −40.57 dB at a thickness of 1.5 mm with CNTs addition of 7%. The enhanced EMW absorption performance of BF-Fe3O4/7C heterostructure may be attributed to the synergistic effects of interfacial polarization between the hollow magnetic Fe3O4 spheres and CNTs, conduction loss, magnetic resonance loss and multiple reflection/scattering inside the BF. This work provides a simple pathway to design EMW absorbing materials with good environmental stability.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）