CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hang Xu,Anqi Niu,Zihan Shang,Geng Li,Fengmin Wu,Xuefeng Wei,Jun Zhang
A heterogeneous catalyst was prepared by wrapping a poly 3-butyl vinylimidazole cobalt chloride ionic liquid (P[BVIM]CoCl 3 ) around the surface of Fe 3 O 4 @SiO 2 magnetic nanoballs. This catalyst was coupled with the oxidant peroxymonosulfate (PMS) for extraction catalytic oxidation desulfurization (ECODS). The prepared desulfurization catalyst had superparamagnetic properties, with a saturation magnetization of 32.5 emu/g. Moreover, this caalyst was multi-porous material, ans it had a specific surface area and pore volume of 8.14 m 2 /g and 0.018 cc/g, respectively. The average pore diameter of catalyst was 3.9 nm. The optimal experimental conditions were as follows: the initial sulfur content of the oil was 500 ppm, the catalyst dosage was 30 mg, PMS (20 wt%) dosage was 0.6 g, the ACN dosage was 2 g, and the oil sample size was 6 g. After 20 min, a sulfur removal rate of over 98 % was achieved at 20 °C. Furthermore, the unpurified catalyst still maintained high desulfurization activity after being used for 5 times, demonstrating good stability. The desulfurization mechanism was divided into two steps: first, DBT was oxidized to DBTO by SO 4 − free radicals, and second, the DBTO was further oxidized to DBTO 2 by OH free radicals in a tandem reaction. The reaction rates for the two steps at 20 °C were 0.0144 sec −1 and 0.00115 sec −1 , respectively. The activation energies associated with these steps were 65.65 kJ/mol and 105.22 kJ/mol, respectively. The quencher t-butanol had no effect on the first step but significantly inhibited the second step, meaning that DBTO became the main oxidation product. One potential application of this study is the utilization of t-butanol to regulate the oxygen content in organic sulfide oxidation products.
研究领域:
催化
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环境化学
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材料科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 23
·14360-14370
·
IF 6.739
Xiulong Jin,Haiyan Li,Shanshan Wang,Ni Kong,Hong Xu,Qihua Fu,Hongchen Gu,Jian Ye
With the increasing need for multi-purpose analysis in the biomedical field, traditional single diagnosis methods cannot meet the requirements. Therefore new multifunctional technologies and materials for the integration of sample collection, sensing and imaging are in great demand. Core–shell nanoparticles offer a unique platform to combine multifunctions in a single particle. In this work, we have constructed a novel type of core–shell superparamagnetic nanoshell (Fe3O4@SiO2@Au), composed of a Fe3O4 cluster core, a thin Au shell and a SiO2 layer in between. The obtained multifunctional nanoparticles combine the magnetic properties and plasmonic optical properties effectively, which were well investigated by a number of experimental characterization methods and theoretical simulations. We have demonstrated that Fe3O4@SiO2@Au nanoparticles can be utilized for two-photon luminescence (TPL) imaging, near-infrared surface-enhanced Raman scattering (NIR SERS) and cell collection by magnetic separation. The TPL intensity could be further greatly enhanced through the plasmon coupling effect in the self-assembled nanoparticle chains, which were triggered by an external magnetic field. In addition, Fe3O4@SiO2@Au nanoparticles may have great potential applications such as enhanced magnetic resonance imaging (MRI) and photo-thermotherapy. Successful combination of multifunctions including magnetic response, biosensing and bioimaging in single nanoparticles allows further manipulation, real-time tracking, and intracellular molecule analysis of live cells at a single-cell level.
研究领域:
生物医学工程
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纳米技术
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材料科学
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分子生物学
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成像科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2020
·
IF 5.278
Jiping Ma,Shuang Li,Gege Wu,Maryam Arabi,Feng Tan,Yafeng Guan,Jinhua Li,Lingxin Chen
A novel kind of Zr-based magnetic metal-organic frameworks (MMOFs) was prepared by immobilization of UiO-66 onto Fe 3 O 4 @SiO 2 particles via an efficient one-pot solvothermal method. Subsequently, it was used for adsorptive removal of triclosan (TCS) and triclocarban (TCC) fungicides from aqueous environments by magnetic solid phase separation. Morphology and physical/chemical features of the MMOFs were fully characterized by XRD, SEM, TEM, FT-IR, and VSM etc., showing high specific surface area, appropriate functionality, and desirable magnetic property. Several main factors affecting the adsorption performances of TCS and TCC on the MMOFs were systematically investigated and optimized, such as pH value of water sample, amounts/types of adsorbent and salinity. Under the optimized conditions, short adsorption equilibrium time (only 25 min) and outstanding saturated adsorption capacities (476.27 and 602.40 mg·g −1 for TCS and TCC, respectively) were the remarkable superiorities of the MMOFs compared with that of most reported adsorbents. The MMOFs demonstrated excellent adsorption selectivity for TCS and TCC and anti-interference ability. Also, the reusability for at least 11 cycles was another major profit of the MMOFs that saved cost and prevented waste. Moreover, the MMOFs demonstrated satisfactory removal/purification ability for actual environmental water samples. These benefits propounded a promising outlook of employing the MMOFs for influential removal of pollutants with considerable reliability in the field of wastewater treatment.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Polymeric Materials and Polymeric Biomaterials
·
2021
·
IF 2.604
Liwen Tang,Ruiting Yang,Haifang Liu,Ziyu Qin,Bining Qiu,Mengting Li,Xueqiong Yin
pH-sensitive magnetic dual drug-loaded microcapsules (MDDM) embracing magnetic nanoparticles Fe3O4@SiO2 and two drugs (roxithromycin (ROX) and theophylline (TH)) were prepared through self-assembly, with methylcellulose and alginate sodium as the wall materials. MDDM was characterized with FTIR, XRD, TGA, vibrating sample magnetometer. The amount of Fe3O4@SiO2 affected the drug encapsulation efficiency lightly whereas affected the diameter of MDDM obviously. The drug loading of ROX and TH was 6.44% and 7.70% at the optimized conditions, respectively. The drug releasing of MDDM expressed obvious pH-sensitivity and increased with the pH value of the medium. The total cumulative release of ROX and TH in the simulative body fluid (pH 7.4) was 83.16% and 81.86% after 12 h, while was 24.54%, 21.21% in simulative gastric liquid. MDDM had higher antibacterial activity and lower cytotoxicity than the pure drugs with same amount, showing good capability on drug protection, controlled-releasing and toxicity elimination.
研究领域:
药学
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材料科学
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纳米技术
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药物递送系统
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qingguo Chen,Jiaxing Liu,Lei Tang,Zhixiang Zeng,Baikang Zhu
The ex-situ method is suitable for the preparation and practical engineering application of large-sized adsorption materials like sponges. pH-responsiveness can solve the post-treatment problem of oil-absorbing sponges. Here, a facile ex-situ method is proposed to construct large-sized multi-functional oil-water separation materials by adsorbing pH-responsive magnetic core-shell structured nanoparticles (MNP) onto different substrates including sponge, metal mesh, and sandpaper. The MNPs are prepared by chemical coating and surface modification. The sponge can achieve in-situ renewable oil-water separation through the "oil absorption - oil desorption" process under different pH values, and the oil droplets exhibit a segmented wiredrawing desorption process. The generated secondary oily wastewater can be further separated through modified metal mesh, which can treat oily wastewater with more complex situations such as oil-water-oil three-phase mixtures. The detached nanoparticles (NP) can be easily recycled and reused through magnets. This method can achieve a large-scale in-situ treatment renewable oil-water separation process that integrates wastewater purification, oil collection, and material regeneration, which is environmentally friendly, energy-saving, and suitable for engineering applications.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 1
·257-265
·
IF 1.385
Jiang Wei,Wu Juan,Tian Renbing,Jiang Wei
Magnetic mesoporous nanocomposites are emerging as a significant new material to improve the effectiveness of cancer treatment and enhance the availability of drug therapy. Thus, the core–shell structure magnetic mesoporous nanocomposites (Fe 3 O 4 @SiO 2 @LDH) were synthesized with an average diameter of about 100 nm and used as methotrexate (MTX) carriers for cancer therapy. As an important biological material, Fe 3 O 4 @SiO 2 @LDH exhibited higher superparamagnetic behavior and biocompatibility, and the drugs can be loaded in the channels of the mesoporous silica and the interlayer of layered double hydroxides (LDH). The embedding rate of magnetic mesoporous silica (Fe 3 O 4 @SiO 2 ) and LDH were 60.32 % and 0.67 %, respectively, and the release rate of the drug delivery systems (Fe 3 O 4 @SiO 2 @LDH-MTX) was 66.81 %. In addition, LDH as a kind of pH-sensitive material was adopted for controlled drug release and WST-1 assays in cancer cells (Hela) demonstrated that Fe 3 O 4 @SiO 2 @LDH-MTX presented high anti-tumor activity, while the carriers were nearly non-toxic. Therefore, all the results suggested that the magnetic nanocomposites can be employed to deliver MTX, and would be applied in the field of cancer therapy in the future.
研究领域:
纳米技术
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材料科学
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药学
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生物医学工程
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癌症研究
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Fangfang Ren,Simin Li,Wenqing Zheng,Qianyi Song,Wenhui Jia,Yaqin Nan,Haijiao Jia,Jia Liu,James Jianmin Bao,Youxin Li
In this paper, an active, recyclable and stable magnetic palladium nanocatalyst (Fe 3 O 4 @SiO 2 -DTPA-Pd) was reported which could catalyze Suzuki coupling reaction. The Pd was stably hold by the three nitrogen atoms at the inside and four acetic acid groups at the outside of the chelating ligand ethylenediaminepentaacetic acid (DTPA) on the surface of core-shell magnetic Fe 3 O 4 @SiO 2 microspheres . The prepared Fe 3 O 4 @SiO 2 -DTPA-Pd was systematically characterized. Results showed its size was 10–20 nm with 0.535 mmol/g Pd 2+ /Pd 0 . It could monodisperse in liquid, was thermally stable and good magnetic response from the high saturation magnetization value at 35.9 emu/g. Its activity was evaluated through Suzuki coupling reactions between 14 types of aryl halides and phenylboronic acid under optimized reaction conditions. It exhibited excellent activities and good applicability to substituted iodobenzene and bromobenzene . The yield of 4-bromobenzonitrile was up to 97.93%. Furthermore, the Fe 3 O 4 @SiO 2 -DTPA-Pd catalyst was stable, reusable and conveniently recovered by applying an external magnetic field. After 20 consecutive reaction cycles, the yield was still above 85%, which showed a superior heterogeneous advantage over other catalysts reported in the literature and had the huge potential in actual application of industry.
研究领域:
化学
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催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Jing Zhou,Ning Gan,Tianhua Li,Hankun Zhou,Xing Li,Yuting Cao,Lihong Wang,Weiguo Sang,Futao Hu
An ultra-sensitive multiplexed signal amplified piezoelectric immunosensor for the detection of C-reactive protein (CRP) in serum was developed. Firstly, a sandwich-type immunoreaction was made between the capture probe [silicon dioxide-coated magnetic Fe 3 O 4 nanoparticles (MNPs) labeled with the primary CRP antibody (MNPs-CRP Ab1)], CRP (different concentrations), and signal tag [horseradish peroxidase (HRP) coupled with the HRP linked secondary CRP antibody co-immobilized on gold nanoparticles (AuNPs-HRP/HRP-CRP Ab2)]. The immunocomplex was subsequently exposed to 3-amino-9-ethylcarbazole (AEC) and hydrogen peroxide. MNPs-CRP Ab1 capture probe could not only improve the CRP enrichment to amplify the signal through magnetic separation, but also be readily immobilized on the electrode by an external magnet to prepare the sensor. The signal tag could immobilize vast HRP, which could catalyze and yield more AEC's insoluble oxidation product on piezoelectric crystal surface, also resulting in the amplified change in frequency response (Δ f = f − f 0 ). Thus the multiplex signal amplification was achieved. The Δ f was proportional to CRP concentration from 0.001 to 100 ng mL −1 with a low detection limit of 0.3 pg mL −1 . The optimum conditions were studied in detail. The proposed method could provide a fast, simple, and sensitive way for the clinical analysis of ultratrace CRP in heart diseases.
研究领域:
生物医学工程
·
分析化学
·
临床检验
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Mingxin Lv,Qianghua Xin,Defu Yin,Zhen Jia,Chunyan Yu,Teng Wang,Shitao Yu,Shiwei Liu,Lu Li,Yue Liu
The use of cellulose instead of oil to produce 1,2-propylene glycol (1,2-PG) is of great significance for building a sustainable world. Herein, we synthesize Fe3O4@SiO2/Ru-WOx core–shell magnetically recoverable catalysts containing both Lewis acid and metal active sites using well-shaped Fe3O4@SiO2 core–shell magnetic nanospheres as the substrate. We investigated the catalytic performances of the bimetallic catalysts with various metals as well as different metal contents and WOx loadings for the conversion of cellulose to 1,2-PG. The results showed that Fe3O4@SiO2/10%Ru-20%WOx was more favorable for 1,2-PG production, with a 1,2-PG selectivity of 32.4% and a cellulose conversion of 96.8%. Our characterization and activity tests suggested that WOx on the Fe3O4@SiO2 nanospheres produced abundant Lewis acid sites to effectively promote glucose isomerization to fructose before glucose undergoes the retro-aldol condensation reaction. Moreover, the Ru further hydrogenated the C3 intermediate to 1,2-PG. It was notable that the catalyst can be separated through a simple magnetic separation after the end of the reaction, and it still maintained high catalytic activity after 5 uses.
研究领域:
化学工程
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催化
·
可持续化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Hui Jiang,Donglei Jiang,Jingdong Shao,Xiulan Sun
We have developed a novel and economical electrochemical sensor to measure Gram-negative bacterial quorum signaling molecules (AHLs) using magnetic nanoparticles and molecularly imprinted polymer (MIP) technology. Magnetic molecularly imprinted polymers (MMIPs) capable of selectively absorbing AHLs were successfully synthesized by surface polymerization. The particles were deposited onto a magnetic carbon paste electrode (MGCE) surface, and characterized by electrochemical measurements. Differential Pulse Voltammetry (DPV) was utilized to record the oxidative current signal that is characteristic of AHL. The detection limit of this assay was determined to be 8×10 −10 mol L −1 with a linear detection range of 2.5×10 −9 mol L −1 to 1.0×10 −7 mol L −1 . This Fe 3 O 4 @SiO 2 -MIP-based electrochemical sensor is a valuable new tool that allows quantitative measurement of Gram-negative bacterial quorum signaling molecules. It has potential applications in the fields of clinical diagnosis or food analysis with real-time detection capability, high specificity, excellent reproducibility, and good stability.
研究领域:
分析化学
·
生物传感器
·
微生物学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
QUIMICA NOVA
·
2023
·Vol. 46
·期 1
·20-28
·
IF 0.8
Zhou Meng,Sun Chunyu,Zhao Hong
Reducing non-specific adsorption of proteins on the surface of magnetic nanoparticles (MNPs) is becoming increasingly important. In this paper, we proposed a novel surface modification procedure by grafting hyperbranched polyglycerol (HPG) onto the surface of MNPs (Fe3O4@SiO2@MAA), in which lots of hydroxyl groups from HPG not only provide the hydrates sheath to prevent non-specific adsorption of proteins, but also react with succinic anhydride to generate carboxyl groups that serve as active sites to specifically bind proteins. The protein adsorption experiments showed that the non-specific adsorption (0.07 μg mg-1) was reduced to 4.58% of that before modification. It also showed that the antigen binding capacity was 9.7 times higher than the original when detecting cardiac troponin I (cTnI) in human plasma samples, which indicated that the final synthesized MNPs had great application prospects in bio-separation and bioanalysis.
研究领域:
材料科学
·
纳米技术
·
生物化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·
IF 1.992
Jin Xu,Xuejia Shi,Xiaomeng Zhang,Zhenzhong Wang,Wei Xiao,Linguo Zhao
To efficiently recycle GH78 thermostable rhamnosidase (TpeRha) and easily separate it from the reaction mixture and furtherly improve the enzyme properties, the magnetic particle Fe 3 O 4 -SiO 2 -NH 2 -Cellu-ZIF8 (FSNcZ8) was prepared by modifying Fe 3 O 4 -NH 2 with tetraethyl silicate (TEOS), microcrystalline cellulose and zinc nitrate hexahydrate. FSNcZ8 displayed better magnetic stability and higher-temperature stability than unmodified Fe 3 O 4 -NH 2 (FN), and it was used to adsorb and immobilize TpeRha from Thermotoga petrophilea 13995. As for properties, FSNcZ8-TpeRha showed optimal reaction temperature and pH of 90°C and 5.0, while its highest activity approached 714 U/g. In addition, FSNcZ8-TpeRha had better higher-temperature stability than FN. After incubation at 80°C for 3 h, the residual enzyme activities of FSNcZ8-TpeRha, FN-TpeRha and free enzyme were 93.5%, 63.32%, and 62.77%, respectively. The organic solvent tolerance and the monosaccharides tolerance of FSNcZ8-TpeRha, compared with free TpeRha, were greatly improved. Using naringin (1 mmol/l) as the substrate, the optimal conversion conditions were as follows: FSNcZ8-TpeRha concentration was 6 U/ml; induction temperature was 80°C; the pH was 5.5; induction time was 30 min, and the yield of products was the same as free enzyme. After repeating the reaction 10 times, the conversion of naringin remained above 80%, showing great improvement of the catalytic efficiency and repeated utilization of the immobilized α-L-rhamnosidase.
研究领域:
生物化学
·
酶工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）