NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 22
·13399-13407
·
IF 3.269
Lei Gu,Yun Wang,Juan Han,Lei Wang,Xu Tang,Cheng Li,Liang Ni
We developed an efficient and mild method for the preparation of boronic acid-functionalized magnetic nanoparticles (MNPs), and the selective separation of fructose from a sample solution was demonstrated for the first time. A modified hydrothermal method was chosen to prepare the naked Fe3O4 MNPs, and then the Fe3O4@SiO2 MNPs were synthesized by a sol–gel reaction. After that, the thiol-coated Fe3O4 MNPs were synthesized by a sol–gel reaction with an organosilicon coupling agent. Finally, the thiol groups on the surface of the MNPs served as clickable sites to react with 4-vinylphenylboronic acid (VPBA) via a thiol–ene (TE) click reaction to obtain the final MNPs with a high density of boronic acid ligands immobilized on the surface. It is known that phenylboronic acid ligands on Fe3O4@SiO2@VPBA MNPs can form stable five- or six-membered cyclic esters with cis-diol-containing molecules. In this work, the click-Fe3O4 MNPs with a mean diameter of 195 nm exhibited high selectivity and binding capacity towards fructose. Also, the adsorption efficiency of fructose could reach ≈96% under optimum adsorption conditions. In addition, the adsorption efficiency of fructose was about six times higher than that of glucose in a fructose–glucose aqueous solution, suggesting that the resultant Fe3O4@SiO2@VPBA MNPs had higher affinity for fructose under the interference of competing glucose. Reusability is also an important factor of affinity adsorbents, and the adsorption capacity of Fe3O4@SiO2@VPBA MNPs was virtually unchanged after six cycles of reuse.
研究领域:
分析化学
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食品科学
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材料科学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 5
·1-10
·
IF 1.784
Guo Huiling,Wang Wenjing,Zhou Fengzhen
In this study, core–shell Fe 3 O 4 @Au nanoparticles with good chemical stability and tunable particle size were synthesized via Au–S bonding, which overcomes the challenges encountered for the reported preparation of Fe 3 O 4 @Au. The surface of nanoparticles was investigated by TEM, XRD, XPS, FT-IR, VSM and DLS which characterized the size, morphology, chemical lattice, elemental analysis, functional groups, magnetic strength, and size distribution. The results showed that Fe 3 O 4 @Au/NTA-Ni 2+ magnetic nanocomposites were spherical with an average diameter of 469.5 nm, and superparamagnetic with saturation magnetization of 7 emu/g. The magnetic nanocomposites were directly utilized for one-step purification of His-tagged proteins from Description Escherichia coli lysate. The as-separated proteins were qualitatively validated by gel analysis and quantitatively measured by UV–visible spectroscopy. The binding capacity of Fe 3 O 4 @Au/NTA-Ni 2+ towards His-tagged proteins was 48.3 mg/g. The target proteins were separated with high purity and separation efficiency up to 96.6%. Their specificity and enrichment ability were maintained during six cycles of adsorption–elution operations. The advantages of this novel nanoparticle can open a window for the multifunction of nanomaterials and their biological application.
研究领域:
生物化学
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纳米技术
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蛋白质工程
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 12
·2187
·
IF 2.468
Yue Teng,Zhiying Liu,Ke Yao,Wenbin Song,Yongjun Sun,Hailing Wang,Yanhua Xu
The use of attapulgite (ATP)-based materials for adsorption of pollutants from water and wastewater has received growing attention. However, recovering ATP-based adsorbents remains a challenge. In this study, a magnetic adsorbent ATP/CoFe2O4with high tannic acid (TA) adsorptive capacity was fabricated via a facile co-precipitation approach and was well characterized. The loaded CoFe2O4particles were embedded into the adsorbent surfaces to allow magnetic separability. For this material, its TA adsorption kinetics, isotherm behavior, and magnetic separation efficiency are reported. The developed magnetic composites had rapid sorption kinetics of 3 h, high sorption capacity of 109.36 mg/g, and good magnetic separation efficiency of 80%. The used ATP/CoFe2O4was successfully regenerated by NaOH and reused five times without a substantial reduction in TA removal and magnetic performance. Intermolecular hydrogen bonding formation and surface complexation were identified as the sorption mechanisms of TA by ATP/CoFe2O4.Keywords:attapulgite;adsorption;CoFe2O4magnetic nanoparticle;tannic acid
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Chuxuan Zhang,Jianhui Zeng,Luqiu Lin,Yang Peng,Xiaomin Li,Xun Gong
As the representative of the 3rd generation feedstock of biodiesel , microalgae show extraordinary advantages for energy demands. Magnetic separation is a proven and effective method for microalgae harvesting. This study aims to investigate the effect of unrecovered magnetite-based nanoparticles (Fe 3 O 4 NPs) after microalgae harvesting on the bio-oil quality, especially nitrogen content in the subsequent production. Co-liquefaction of Chlorella Vulgaris mixed with three residual amounts (1 wt%, 5 wt%, and 10 wt% of microalgae addition) Fe 3 O 4 NPs in ethanol at 220 and 260 °C were performed. Ethanol can provide hydrogen in situ during liquefaction , and the catalytic activity of Fe 3 O 4 to hydrogenation reaction enhances the yield and quality of bio-oil. At 260 °C and 5 wt% NPs dosage, the bio-oil yield can reach up to 79.71%. The addition of NPs reduces the relative N content of bio-oil by more than 16.90%. GC/MS analysis shows that the nitrogen heterocyclic compounds are significantly reduced about 60%; instead, hydrocarbons are increased in the bio-oil. It implies that Fe 3 O 4 NPs are beneficial to the denitrogenation of bio-oil during microalgae liquefaction in ethanol.
研究领域:
能源生物学
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环境科学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2018
·
IF 4.946
Nana Sun,Yuan Ding,Zhexuan Tao,Hongjie You,Xiude Hua,Minghua Wang
An upconversion fluorescence DNA probe which consists of aptamer-conjugated magnet nanoparticles (apt-MNPs) and complementary DNA-conjugated upconversion nanoparticles (cDNA-UCNPs) was developed to detect acetamiprid. Acetamiprid can specifically conjugate with the apt-MNPs to dissociate the cDNA-UCNPs from the apt-MNPs and resulted in reduced fluorescence intensity through an external magnet. The change of fluorescence intensity (△I) is positively related to the concentration of acetamiprid, which can be applied for the quantification of acetamiprid. Under optimal conditions, a linear detection range and detection limit are 0.89–114.18 μg/L and 0.65 μg/L, respectively. The probe was successfully used to detect acetamiprid in spiked paddy water, soil, pear, apple, wheat and cucumber. Average recoveries are 78.2%–103.5% with intra-day relative standard deviations (RSDs) of 2.6%–10.9% and inter-day RSDs of 4.3%–10.2%. The amounts of acetamiprid in the authentic paddy water and pear samples detected by the DNA probe are significantly correlated with that detected by high-performance liquid chromatography (HPLC).
研究领域:
分析化学
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环境科学
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农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Ruixiong Huang,Zhanqiang Fang,Xiaomin Yan,Wen Cheng
In this study, the Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized as heterogeneous catalysts to effectively degrade bisphenol A (BPA). The properties of the synthesized catalysts were characterized by Brunnaer–Emmett–Teller (BET), X-ray powder diffraction (XRD), X-ray photoelectron spectrometry (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The results indicated that the Fe 3 O 4 MNPs appeared to be roughly spherical shapes and their average size was 10–20 nm. The catalytic capacity of MNPs in US + Fe 3 O 4 + H 2 O 2 system with different pH conditions, H 2 O 2 concentrations and MNPs doses was investigated. It was found that the OH radicals were promptly generated due to the catalysis of the Fe 3 O 4 MNPs. BPA could be degraded within a wide pH range from 3 to 9, and the degradation efficiencies were remarkably enhanced by ultrasound. The apparent rate constants were 8.31 × 10 −3 , 7.96 × 10 −3 and 5.64 × 10 −3 min −1 , respectively, when the pH values were 3, 7 and 9, respectively. The removal efficiencies of BPA were all over 95%. About half total organic carbon (TOC) in solution was eliminated under neutral condition by sono-Fenton process. Furthermore, the results of stability and reusability demonstrated that the Fe 3 O 4 MNPS were promising in the treatment of wastewater with refractory organics.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Junxin Zhao,Maomao Ma,Xianghui Yan,Dongman Wan,Zheling Zeng,Ping Yu,Deming Gong
The lipase from Bacillus licheniformis NCU CS-5 was immobilized onto β -cyclodextrin (CD) grafted and aminopropyl-functionalized chitosan-coated Fe 3 O 4 magnetic nanocomposites (Fe 3 O 4 -CTS-APTES-GA- β -CD). Fourier transform infrared spectroscopy, thermogravimetry analysis, X-ray diffraction, scanning electron microscopy and transmission electron microscopy showed that not only the functionalized magnetic nanoparticles were synthesized but also the immobilized lipase was successfully produced. The immobilized lipase exhibited higher optimal pH value (10.5) and temperature (60℃) than the free lipase. The pH and thermal stabilities of the immobilized lipase were improved significantly compared to the free lipase. The immobilized lipase remained more than 80% of the relative activity at temperature of 60 ℃ and pH 12.0. The immobilized lipase also remained over 80% of its relative activity after 28 days of storage and 15 cycles of application. The application of the immobilized lipase in esterification of isoamyl acetate and pentyl valerate showed that maximum esterification efficiency was achieved in n -hexane having 68.0% and 89.2% respectively. Therefore, these results indicated that the Fe 3 O 4 -CTS-APTES-GA- β -CD nanoparticles are novel carriers for immobilizing enzyme, and the immobilized lipase can be used as an innovative green approach to the synthesis of fruity flavor esters in food industry.
研究领域:
生物化学
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食品科学
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Yunxuan Chen,Jun Nan
Abandoning the costly development of new membrane materials and instead directly remodeling the naturally occurring cake layer constitutes a dynamic, low-cost, long-lasting, and proactive strategy to "fight fouling with fouling". Several optimization strategies, including coagulation/modified magnetic seed loading and applying a weak magnetic force (0.01T) at the ultrafiltration end, improved the anti-fouling, retention, and sieving performances of conventional ultrafiltration process during the treatment of source water having complex natural organic matter (NOMs) and small molecule micropollutants. Two modified magnetic seeds we prepared were composite nano-seed particles (Fe 3 O 4 @SiO 2 -NH 2 (FS) and Fe 3 O 4 @SiO 2 @PAMAM-NH 2 (FSP)). Aim of the study was to regulate the formation of cake layer via comprehensive testing of the antifouling properties of optimized processes and related mechanistic studies. It was found to be essential to enhance the interception of xanthate and tryptophan proteins in the cake layer for improving the anti-fouling performance based on the correlation and redundancy analyses, while the use of modified magnetic seeds and magnetic field showed a significant positive impact on water production. Blockage modeling demonstrated the ability to form a mature cake layer during the initial filtration stage swiftly. This mitigated the risk of irreversible fouling caused by pore blockage during the early stage of coagulation-ultrafiltration. Morphologically, the reconstructed cake layer exhibited elevated surface porosity, an internal cavity channel structure, and enhanced roughness that can promote increased water flux and retention of water impurities. These optimized the maturity of the cake layer in both time and space. Density Functional Theory (DFT), Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, and Modified Extended Derjaguin-Landau-Verwey-Overbeek (MDLVO) calculations indicated aggregation behavior of matter on the cake layer to be enhanced effectively due to magnetic seed loading. This is mainly due to the strengthening of polar interactions, including hydrogen bonding, π-π* conjugation, etc., which can happen between the cake layer loaded with FSP and the organic matter. Under the influence of a magnetic field, magnetic force energy (VMF) significantly impacts the system by eliminating energy barriers. This research will provide innovative strategies for effectively purifying intricate source water through ultrafiltration while controlling membrane fouling.
研究领域:
环境科学
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材料科学
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水处理工程
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产品关联
DOI
PubMed
高影响因子
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
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2015
·
IF 1.03
Xiaojun Wang,Jingjing Chen,Ying Zhou,Xiaoyi Liu,Hongzhou Yao,Farooq Ahmad
A rapid and novel two-step dispersive liquid–liquid microextraction and dispersive micro-solid phase extraction method was established for the separation and enrichment of trace cadmium, nickel, and copper in food and environmental water prior to determination by inductively coupled plasma-mass spectrometry (ICP-MS). In the first microextraction step, carbon tetrachloride was employed to extract metal-diethyldithiocarbamate chelates from aqueous solution with ultrasound. In the following step, Fe3O4 magnetic nanoparticles were added and used to collect the analytes in the organic solvent. The sample pH, type and volume of extraction solvent, mass of magnetic nanoparticles, concentration of the chelating agent, concentration of sodium chloride, and sonication time were optimized. The linear dynamic range was from 0.01 to 20 micrograms per liter with correlation coefficients between 0.9990 and 0.9992. Enrichment factors were 78, 79, and 81 for cadmium, nickel, and copper, respectively. The limits of detection for cadmium, nickel, and copper were 0.007, 0.009, and 0.017 micrograms per liter, with relative standard deviations from 1.1 to 2.6 percent. The developed method was validated by the determination of cadmium, nickel, and copper in rice and mussel certified reference materials, food, and environmental water with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Wanling Cai,Mengyu Guo,Xiulan Weng,Wei Zhang,Zuliang Chen
Since Fe 3 O 4 nanoparticles synthesized by plant extracts possess good bio-compatibility and superparamagnetic properties, the possibility of these could be used as a carrier in drug delivery. In this work, doxorubicin hydrochloride (DOX), an anti-cancer drug, loaded on glutaric anhydride-functionalized magnetic nanoparticles (Fe 3 O 4 @SiO 2 -Glu) was investigated at varying pH values for effective drug delivery. Various factors affecting the adsorption of DOX onto the Fe 3 O 4 @SiO 2 -Glu were examined, where the adsorption efficiency of DOX reached 92% at a concentration of 20 mg/L employing 10 mg of Fe 3 O 4 @SiO 2 -Glu at 303 K in pH 7.4. However, the adsorption efficiency of DOX was decreased to 18% at acidic pH value down to 3.0, implicating that the drug releasing process was controlled by pH. Adsorption kinetics was fitting to pseudo-second-order and the isothermal adsorption conformed to Freundlich isotherm. The morphology and surface composition of the synthesized Fe 3 O 4 @SiO 2 -Glu were characterized by SEM, TEM , and N 2 adsorption/desorption isotherms, revealing that the specific surface area being 62.6 m 2 /g and the size ranging from ~30 to 50 nm. The zeta potential results indicated that Fe 3 O 4 @SiO 2 -Glu were negatively charged in various pH from 3 to 8.5. Characterizations by FTIR and UV–Vis techniques suggested that the DOX was absorbed and it can be delivered by Fe 3 O 4 @SiO 2 -Glu.
研究领域:
生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 6
·1-11
·
IF 2.132
Sun Tingting,Liang Huazhe,Liu Shaojie,Tang Erjun,Fu Cuiyan
Magnetic nanoparticles (MNPs) modified by polyamidoamine (PAMAM)-immobilized 2,2,6,6-tetramethyl-1-piperidinyl-oxyl (TEMPO) as recoverable catalysts for catalytic oxidation of polyethylene glycol were designed and prepared, which were expected to combine the advantages of easy recovery of MNPs and high activity of PAMAM-immobilized TEMPO. The catalysts of MNPs modified by PAMAM-immobilized TEMPO (MNPs-PAMAM-T) were characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analyzer (TGA), and transmission electron microscopy (TEM). The mean particle size of MNPs was about 10 nm. MNPs-PAMAM-T/NaBr/NaClO was used as catalytic system for catalytic oxidation of monomethoxy poly (ethylene glycol). The catalytic performances were affected by the loading amounts of TEMPO and PAMAM generations. It was shown that the catalyst with TEMPO loading of 5.198 mmol/g using G2.0 PAMAM-modified MNPs as carrier had the best catalytic performance, which could be up to 94% of the free TEMPO level. The efficient recovery of catalyst could be achieved by magnetic separation and the recycling performance was good.
研究领域:
化学工程
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材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）