RSC Advances
·
2016
·Vol. 6
·期 84
·81310-81317
·
IF 3.289
Yue Liu,Lu Li,Shiwei Liu,Congxia Xie,Shitao Yu
(3-Aminopropyl)-triethoxysilane (APTS) and (3-mercaptopropyl)-trimethoxysilane (MPTS) grafted SiO2-coated iron oxide (Fe3O4@SiO2) magnetic supports were prepared. Various noble metal nanoparticles such as Ru, Pt, Rh and Pd were directly grown on the surfaces of the magnetic supports with ultrasmall and nearly monodisperse sizes, especially the APTS grafted Fe3O4@SiO2 (Fe3O4@SiO2/APTS) nanospheres. The Fe3O4@SiO2/APTS/Ru catalyst demonstrated a high catalytic activity towards the hydrogenation of α-pinene to form cis-pinane. The conversion of α-pinene was 99.1% and the selectivity for cis-pinane reached 97.6% at 120 °C after 4 h. The Fe3O4@SiO2/APTS/Ru catalyst was easily separated from the reaction mixture when applying an external magnetic field, and the separated Fe3O4@SiO2/APTS/Ru had good reusability. After being reused eight times, the α-pinene conversion and the cis-pinane selectivity also can reach 97.8% and 96.9%, respectively.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jinshan Song,Nengwei Ma,Wenqing Chen,Jianmeng Chen,Qizhou Dai
In this study, a magnetic Fe 3 O 4 @SiO 2 @La 2 O 3 nano-catalyst with a core–shell structure was synthesized to improve the efficiency of catalytic ozonation of cinnamyl alcohol. The structure, morphology, and elemental composition of the catalyst were analyzed with the help of catalyst characterization methods. The mechanism of strengthened degradation efficiency and mineralization of cinnamyl alcohol in catalytic ozonation system in the existence of the catalyst were further discussed according to the analysis results. The results showed that the Fe 3 O 4 @SiO 2 @La 2 O 3 catalyst can not only greatly improve the degradation of cinnamyl alcohol, but also has good reusability and stability. And its economic efficiency is relatively good. The degradation rate of cinnamyl alcohol could reach up to 99.8% at 30 min, and the COD could be removed by 28.5% at 60 min with the help of the catalyst. The degradation efficiency of cinnamyl alcohol by ozone oxidation alone was only 52.1% at 30 min, and the COD removal rate was only 24.2% at 60 min in the same experimental conditions. Besides, the possible degradation pathway and degradation mechanism of cinnamyl alcohol were proposed according to the intermediate products detected by gas chromatography-mass spectrometry.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Wei Xie,Yulong Ju,Jian Zhang,Yiwen Yang,Yanbo Zeng,Hailong Wang,Lei Li
A magnetic Fe 3 O 4 @SiO 2 @MIPIL fluorescent sensor for the determination of imidacloprid (IMD) with high sensitivity and specificity was prepared through surface molecular imprinting technology on the surface of Fe 3 O 4 @SiO 2 by using dialkenyl ionic liquid (C) as a fluorescent polymer monomer . The as-prepared sensor was characterized by thermogravimetric, FT-IR, SEM, TEM, and nitrogen adsorption-desorption analysis. Results showed that IMD rapidly quenched the fluorescence of the sensor within 1 min and had an excellent linear relationship to the fluorescent quenching intensity of the sensor within the range of 1–1000 nM (IMD). The LOD was 0.3 nM (S/N = 3). The sensor had a specific response to IMD and was used to detect IMD in actual spiked environmental water and food samples with satisfactory result.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Yulong Liu,Jian Fu,Hao Zeng,Ruixue Qu,Qing Feng,Xiaonan Li,Fan Zhang,Yuehui She
Aiming at the problems of small pores, complex structure, large seepage resistance, and poor recovery effect in the development process of offshore medium and low permeability reservoirs, a green and environmental friendly biological nanocomposite fluid (BNF) was developed to enhanced crude oil recovery (EOR). Fe 3 O 4 @SiO 2 -Ag nanoparticles (NPs) were synthesized in the laboratory, and citric acid, tannic acid, sodium alginate, and trehalose lipids were used as surface modifiers for NPs and as fluid stabilizers. The nanocomposites were characterized by SEM–EDS, TEM, FTIR, XPS, XRD, and VSM. The EOR mechanism of BNF was studied by laboratory experiments, in which the interfacial tension can be reduced by 80 %. Moreover, 500 ppm BNF could keep oil and water emulsified for more than 3 months. Static separation of oil droplets and dynamic stripping of oil film exhibited obvious effects, and the bioactive substances’ dispersant and NPs can jointly drive away residual oil. The experiment on core displacement of crude oil showed that 500 ppm BNF can enhance oil recovery by 15.56 % on the basis of water flooding. The BNF oil displacement agent is economic and environmental friendly, providing a new method for the green and high-quality development of offshore oil fields.
研究领域:
石油工程
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材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Weiqi Wei,Gaojing Lyu,Weikun Jiang,Zhengyu Chen,Shubin Wu
In this work, a sulfonic acid-functionalized magnetic separable solid acid (Fe 3 O 4 @SiO 2 -SO 3 H) was synthesized, characterized, and tested for fructose conversion to 5-hydroxymethylfurfural (HMF). Results indicated that the prepared catalyst had a good efficacy for fructose dehydration to HMF due to its larger specific surface area, appropriate acid amount and homogeneous acid distribution. The maximum HMF yield of this work was 96.1 mol%. It was obtained at 120 °C for 1.5 h with 100 mol% fructose conversion. More importantly, the produced HMF could be further in-situ oxidized into 2,5-diformylfuran (DFF) after the replacing of the Fe 3 O 4 @SiO 2 -SO 3 H with a ZnFeRuO 4 catalyst, and the highest DFF yield of 90.2 mol% (based on initial fructose) was obtained after reaction another 8.5 h. The production of DFF from fructose through the above two consecutive steps avoids the intermediate HMF separation, which saves time and energy. In addition, both Fe 3 O 4 @SiO 2 -SO 3 H and ZnFeRuO 4 catalysts exhibited satisfied stability in the recycling experiments, which can be reused at least for five times with the HMF and DFF yield loss<5.3% and 3.3%, respectively. Finally, the plausible reaction mechanisms for fructose conversion to HMF or DFF over Fe 3 O 4 @SiO 2 -SO 3 H or/and ZnFeRuO 4 catalysts were also proposed in this work.
研究领域:
化学工程
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催化
·
可再生能源
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
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.
研究领域:
材料科学
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分析化学
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生物医学工程
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DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2025
·
IF 3.1
Jin Jiafei,Cai Xiaoming,Zhang Zhiwu,Zhao Ziming,Fu Han,Tang Junwen,Xiao Weiqi,Qin Ming,Cai Jinming
As the power density of electronic devices continues to increase, traditional coolants (e.g., water and ethylene glycol) are unable to meet the demand for efficient heat dissipation. This study prepared graphene oxide (GO)/aminated iron (III) oxide (Fe 3 O 4 @SiO 2 –NH 2 ) nanofluids (NFs, abbreviated as GF NFs) with different mass fractions, and systematically investigated their stability, thermophysical properties, and heat transfer enhancement (HTE) mechanism under magnetic field modulation. Experimental results show the following: The viscosity of NFs increases with rising particle concentration and decreases with increasing temperature; Conductivity increases with increasing concentration and temperature. For heat transfer performance, the convective heat transfer coefficient (h) of the NFs increased significantly with flow rate. Adding 0.05 mass% GF to the base fluid, the maximum HTE of GF NFs reached 120%. reducing the device temperature by 2.2 °C. Under a 1460 G magnetic field, the 0.1mass% GF NF reduced the device temperature by 2.6 °C compared to the base fluid. Combined with numerical simulations, this study reveals that the Brownian motion of nanoparticles (NPs) and magnetically induced micro-convection synergistically disrupt the thermal boundary layer, thereby enhancing the heat transfer performance of NFs. This study provides novel functionalized NF materials and regulation strategies for the intelligent thermal management of high-power electronic devices.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 81
·期 1
·170-177
·
IF 1.638
Gong Tao,Tang Yongbai
Novel magnetic Fe 3 O 4 @SiO 2 -ethylenediamine tetraacetic acid (adsorbent) CMS–COOH-modified magnetic materials, CMS was prepared by surface modification of amino-functionalized Fe 3 O 4 @SiO 2 (-NH 2 -modified magnetic materials, NMS) with EDTA using water-soluble carbodiimide as the cross-linker in deionized water solution. The phase structure, infrared spectra, thermal analysis and magnetic properties of were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, and vibrating sample magnetometry and its properties for removal of heavy metal ions under varied experimental conditions were also investigated. The results revealed that CMS had good tolerance to low pH and exhibited good removal efficiency for the metal ions. The maximum adsorption capacities of CMS were found to be 0.11 mmol g −1 for Cu(II) at pH5.0 (30 °C) and 0.14 mmol g −1 for Pb(II) ions at pH2.0 (30 °C).
研究领域:
环境科学
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材料化学
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纳米技术
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水污染控制
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DOI
高影响因子
Science China-Chemistry
·
2019
·Vol. 62
·期 7
·889-896
·
IF 6.085
Wang Zhaolei,Jiang Xue,Liu Wenbin,Lu Guolin,Huang Xiaoyu
A new kind of bifunctional magnetic-fluorescent nanoparticles (NPs) with abundant carboxyls on the surface has been prepared by covalently combining glutathiose (GSH)-modified CdTe quantum dots (QDs) with Fe 3 O 4 @SiO 2 NPs. The silica-coated Fe 3 O 4 NPs were functionalized with amino groups by (3-aminopropyl)triethoxysilane to provide Fe 3 O 4 @SiO 2 -NH 2 NPs, which was then chemically conjugated with GSH-modified CdTe QDs to form bifunctional magnetic-fluorescent NPs, Fe 3 O 4 @SiO 2 -NH-CO-CdTe-QDs NPs. The properties and morphologies of Fe 3 O 4 @SiO 2 -NH-CO-CdTe-QDs NPs were investigated by FTIR, Xray diffraction, transmission electron microscopy (TEM), absorption and fluorescence spectroscopy and vibrating sample magnetometry. TEM images display that Fe 3 O 4 @SiO 2 -NH-CO-CdTe-QDs NPs possess spherical core-shell structure with a uniform size about 50 nm. The bifunctional NPs were found to exhibit good magnetic and strong fluorescent properties favorable for their application in the detection of latent fingerprints. Furthermore, the carboxyls on the surface of NPs have good absorptions with water in air and the residues of fingerprints so as to not only avoid dust flying to protect the health of operators, but also improve the efficiency of detection.
研究领域:
纳米生物技术
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法医科学
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分析化学
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材料科学
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分子影像
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表面功能化
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DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2012
·
IF 0.606
Jinyu Chu,Bing Wang,Yujun Song,Xiaohua Zou,Chunxiang Li,Yongsheng Yan
A highly selective imprinted amino-functionalized Fe3O4@SiO2 sorbent was prepared by surface molecular imprinting technique for selective removal of trace 2,4-dichlorophenol (2,4-DCP) in water samples. The 2,4-DCP-imprinted amino-functionalized Fe3O4@SiO2 sorbent was characterized by Fourier transform infrared, transmission electron microscopy, vibrating sample magnetometer, thermogravimetric analysis and batch-mode binding studies. The imprinted functionalized Fe3O4@SiO2 sorbent exhibited high selectivity and offered a fast kinetics for the adsorption of 2,4-DCP. The prepared sorbent was shown to be promising for selective removal of trace levels of 2,4-DCP in environmental water samples.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 26
·2974-2980
·
IF 2.896
Xinze Wu,Yifei Cao,Bin Sun,Huaixia Chen,Xueping Dang,Xiaolan Liu,Youhong Ai
In this study, magnetic Fe3O4@SiO2@β-cyclodextrin copolymerized microparticles were synthesized and applied for the extraction of methyl parathion and fenthion in lettuce samples followed by HPLC-UV detection. The magnetic β-cyclodextrin copolymerized microparticles were prepared by dispersion polymerization with acryloyl β-cyclodextrin as the functional monomer and ethylene glycol dimethyacrylate as the crosslinker. The composite magnetic microparticles were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, magnetic measurement, and thermogravimetric analysis, and used as the adsorbent of magnetic solid-phase extraction (MSPE) for methyl parathion and fenthion. The extraction conditions including sample pH and ionic strength, desorption solvent type and volume, and adsorption and desorption times were optimized. Under the optimal extraction conditions, an MSPE-HPLC-UV method was developed for the detection of methyl parathion and fenthion in lettuce. Wide linear ranges of 1.0–200 μg kg−1 (R2 = 0.9998) for methyl parathion and 1.5–200 μg kg−1 (R2 = 0.9978) for fenthion were obtained and the limits of detection were 0.3 μg kg−1 for methyl parathion and 0.5 μg kg−1 for fenthion in lettuce, respectively. The proposed method was applied for the determination of methyl parathion and fenthion in lettuce with satisfactory recoveries between 89.2–101.2%, and relative standard deviations were less than 9.1%. Thus, the MSPE-HPLC-UV method has high accuracy and sensitivity for the analysis of methyl parathion and fenthion in lettuce samples.
研究领域:
分析化学
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食品科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Gang Su,Lihua Liu,Xing Liu,Lixing Zhang,Jianrong Xue,Anping Tang
A novel magnetic Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO composite was successfully fabricated via a facile hydrothermal method . This composite consisted of flower-like core-shell structured Fe 3 O 4 @SiO 2 @BiFeO 3 microspheres mounting on reduced graphene oxide (rGO) nanosheets . The specific surface areas, magnetization saturation value ( M s ), and band gap energy ( E g ) of Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) were 139.26 m 2 /g, 20.3 emu/g, and 1.91 eV, respectively. Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) exhibited remarkable ability to photocatalytically degrade ciprofloxacin (CIP), tetracycline hydrochloride (TC-H), methylene blue (MB), and decolorize a mixed solution of MB, methyl orange (MO), and rhodamine B (Rh B); CIP, TC-H, and MB degradation by Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO conformed to a first-order kinetic reaction, and the corresponding k app values by Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) were 0.04211, 0.02792, and 0.05967 min −1 , respectively. Excellent magnetic separation performance, recyclability, and stability were also observed. A suitable amount of rGO to the as-prepared photocatalyst could decrease the E g , accelerate the transfer of photogenerated electrons (e − ), suppress the recombination of photo-generated e − –hole (h + ) pairs, and enhance the visible-light response of the catalyst. The •OH is the dominant active species during photocatalysis . This work suggests a promising strategy to synthesize photocatalysts with enhanced ability to catalytically degrade organic pollutant under visible light and excellent recyclability.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
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