CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Chen Chen,Haoyu Yuan,Xiaoming Wang,Yan Lin,Yan He,Fei Wang
Gas hydrate has been proposed as an effective medium for gas separation, desalination, gas storage and so on, yet the low reaction rate has been hindering the industrialization of hydrate-based technology . Hence various kinds of promoters, especially nano particles , have been introduced and investigated to increase the rate of hydrate formation. However, the recyclability of these promoters has not been given sufficient attention from an environmental friendly and economic point of view. In this study, a recyclable magnetic Fe 3 O 4 nanoparticle coated with SDS (SDS-coated Fe 3 O 4 ) was synthesized and successfully used for hydrate formation promotion as well as cycle experiments. The results showed that SDS-coated Fe 3 O 4 exhibited more efficient promotion for hydrate formation than bare Fe 3 O 4 in the studied concentration range. Especially, the induction time and reaction time can be significantly reduced to 77.6 ± 24.1 and 36 ± 3 min, respectively, and the methane storage capacity can be maintained up to 130 ± 5.9 v/v with the concentration of 20 g/L SDS-coated Fe 3 O 4 . Further comparison of bare Fe 3 O 4 and SDS-coated Fe 3 O 4 during cycle experiments showed that after 5 cycles, the methane storage capacity and reaction time in presence of SDS-coated Fe 3 O 4 can still be maintained as 119.5 ± 8 v/v and 110 ± 10 min, which were even better than the performance of bare Fe 3 O 4 just after two cycles. To sum up, SDS-coated Fe 3 O 4 can be recycled and reused many times for the hydrate formation, indicating that the SDS-coated Fe 3 O 4 has a potential to increase the recyclability and its economy for promoters in the hydrate-based technology.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Wei Yang,Jianwen Fei,Wei Xu,Hongyan Jiang,Marwan Sakran,Junli Hong,Wanying Zhu,Xuemin Zhou
High plasma urate is closely related to gout, cardiovascular and other diseases. Therefore, monitoring the content of uric acid (UA) in plasma is of great significance for the treatment of gout and the prevention of other related diseases. Herein, a biosensor based on the biomimetic oxidase Fe 3 O 4 nanoparticles (NPs) @MnO 2 nanosheets (Fe 3 O 4 @MnO 2 NS) was constructed for colorimetric determination of UA. MnO 2 NS is an efficient biomimetic oxidase, and we found that the intrinsic oxidase activity of MnO 2 NS doped with Fe 3 O 4 NPs can be significantly enhanced. The chromogenic substrate TMB can be catalyzed by Fe 3 O 4 @MnO 2 NS to generate blue oxidized TMB, and UA can decompose the MnO 2 NS to inhibit the color reaction of TMB selectively, thereby realizing the quantitative detection of UA. In addition, the UA biosensor can perform colorimetric analysis of UA level through three methods: naked eye, smartphone and ultraviolet-visible (UV–vis) spectrophotometer. The linear ranges of UV–vis spectrophotometry and colorimetry with smartphone were 1–70 μM and 200–650 μM, respectively, and the limits of detection (LOD) were 0.27 μM and 21 μM. The analysis results of human plasma samples showed that the method had good selectivity and practicability.
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TALANTA
·
2022
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IF 6.556
Feng Zhang,Sihui Li,Chao Liu,Kun Fang,Yongmei Jiang,Jianyong Zhang,Jie Lan,Lei Zhu,Hanqing Pang,Gang Wang
Insufficient acetylcholine (ACh) can cause cognitive and memory dysfunction, clinically known as, Alzheimer's disease (AD). Acetylcholinesterase (AChE) can hydrolyze ACh into acetic acid and inactivate choline . Therefore, inhibiting the activity of AChE would help to improve the effectiveness of AD treatment . Currently, the methods for rapid screening of AChE inhibitors are limited. This study reports the application of AChE-immobilized magnetic nanoparticles as a drug screening tool to screen AChE inhibitors for natural products . First, AChE was immobilized on a surface of amino-modified magnetic nanoparticles using covalent binding and the AChE concentration, and the pH as well as time was optimized to obtain the maximum enzyme immobilization yield (61.4 μg/mg), and the kinetic model indicated that AChE-immobilized magnetic nanoparticles and the substrate had the high affinity and specificity. Then, a ligand fishing experiment was carried out using a mixed model of tacrine (an inhibitor of AChE) and caffeic acid (a non-inhibitor of AChE) to verify the specificity of the immobilized AChE, and the conditions for ligand fishing were further optimized. Finally, the optimized immobilized AChE was combined with UPLC-MS to screen for AChE inhibitors in Selaginella doederleinii Hieron extracts. Four compounds were confirmed to be potent AChE inhibitors. Among the four compounds, amentoflavone had a stronger AChE inhibitory effect than tacrine (positive control) with an IC 50 of 0.73 ± 0.009 μmol/L. The results showed that AChE-functionalized magnetic nanoparticles can be used in the discovery of target drugs from complex matrices.
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FOOD CHEMISTRY
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2022
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IF 9.231
Shuofeng Li,Weihua Liu,Qianqian Wang,Mingming Xu,Yangjuan An,Lin Hao,Chun Wang,Qiuhua Wu,Zhi Wang
A magnetic covalent organic framework (COF) was constructed with ethidium bromide (EB) and 1,3,5-triformylphloroglucinol as building blocks. The prepared magnetic COF (named as EB-COF@Fe 3 O 4 ) exhibited high adsorption ability for five benzoylurea insecticides (BUs). By combining EB-COF@Fe 3 O 4 based magnetic solid-phase extraction with high performance liquid-phase chromatographic detection, a novel method was developed for determination of five BUs in water and food samples. Under the optimized conditions, a good linearity was obtained to be 0.03–100.0 ng mL −1 for water and juice, 0.9–500 ng g −1 for tomato. The detection limits of the method were 0.01–0.09 ng mL −1 , 0.03–0.3 ng mL −1 and 0.3–2.0 ng g −1 for water, juice and tomato samples, respectively. Satisfactory method recoveries were achieved in the range of 80.0%-116.0% with the intra-day and inter-day relative standard deviations below 10%. Moreover, the EB-COF@Fe 3 O 4 can be reused at least 25 times. Therefore, the established method is sensitive and robust for determining BUs in real samples.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Jinqing He,Tong Dou,Shuteng Diao,Yiping Wang,Xuhui Zhao,Fazhi Zhang,Xiaodong Lei
The reduction of carbon dioxide to valuable chemical products is a hot topic of current research. In this article, Cu nanoparticle-decorated Fe3O4 (Cu/Fe3O4) is prepared by using layered double hydroxide (LDH) as the precursor. The CuFe-LDH is synthesized using the coprecipitation method and further reduced to obtain the final material Cu/Fe3O4. The uniform layered structure of LDH results in highly dispersed metallic elements in the corresponding Cu/Fe3O4, in which Cu atoms provide Cu0 and Cu+ pairs and good electrical conductivity during the reduction process with Fe3O4 as the framework. Therefore, Cu/Fe3O4 shows high selectivity for CO2 electroreduction to ethanol, in which the Faraday efficiency is 50.9% at −0.3 V vs RHE. Experimental results show that Cu/Fe3O4 generates uniformly distributed Cu+ sites during CO2 electroreduction, which is conducive to the formation of *CHO, a key intermediate to ethanol. This study provides a design method for catalysts of CO2 electroreduction with feasibility.
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MICROCHIMICA ACTA
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2023
·Vol. 190
·期 5
·1-10
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IF 5.7
Ni Yun,Chen Xiu,Ling Chen,Zhu Ziye,Yue Yao,Wang Jie,He Aolin,Liu Ruijiang
The CYP2C19*2 gene carriers and non-carriers are closely related to the dosage of clopidogrel. To correctly guide the use of clopidogrel and promote individualized therapy, an ultra-sensitive electrochemical biosensor was developed for the detection of CYP2C19*2 gene. The heterogeneous α-Fe 2 O 3 /Fe 3 O 4 nanosheets were prepared via the hydrothermal-calcination process, and the preparation parameters were optimized. The average diameter and thickness of the nanosheets were approximately 150 nm and 53 nm, respectively; and the saturation magnetization was 80.2 emu/g. The α-Fe 2 O 3 /Fe 3 O 4 @Au nanosheets were prepared by sodium borohydride reduction method, and self-assembled to the electrode surface with magnetic field. Ultra-sensitive detection of CYP2C19*2 gene was realized through the recognition ability of strong single base mismatching of peptide nucleic acid and signal amplification effect of magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanosheets. Under optimal detection conditions, the current had a good linear correlation with the negative logarithm of CYP2C19*2 gene concentration in the range 1 pM—1 nM, and the detection limit was 0.64 pM (S/N = 3). Meanwhile, the electrochemical signals of target DNA and incomplete complementary DNA were detected. The constructed biosensor exhibited good selectivity, reproducibility, and stability, providing a promising strategy for the detection of other gene mutations by electrochemical biosensors. Graphical Abstract
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ACS Applied Nano Materials
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2021
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IF 5.097
Xiuxiu Sun,Ani Zhou,Shuzhen Li,Maoguo Li
On using magnetic Fe3O4 as the core of nitrogen-doped carbon (NC) matrix composite Fe3C (Fe3C/Fe3O4@NC), it not only shows good peroxide-like and oxidase-like properties but also has excellent Fenton-like degradability. Based on the Fenton-like properties of the core–shell nanocomposites, ciprofloxacin can be degraded by activated peroxo monosulfate. The magnetic core is easy to recover, and the shell has good catalytic performance. The degradation rate using Fe3C/Fe3O4@NC as the catalyst was 7.3 and 2.9 times that of Fe3O4 and Fe3O4@NC as catalysts, respectively, and the sulfate radical was found to be the main active species involved in the degradation. The actual performance of the catalyst was evaluated in simulated wastewater and different water sources. Inorganic anions slightly changed the degradation rate, while common organic compounds in wastewater reduced the degradation rate. The composite materials have excellent catalytic performance, good magnetic response, and repeatability, which are conducive to practical application in wastewater treatment process.
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Journal of Water Process Engineering
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2021
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IF 5.485
Wen Huang,Yaxin Tang,Xueping Zhang,Ze Luo,Jianqiang Zhang
The pollution problem of livestock manure generated by the rapid development of farming industry is becoming more and more serious, and its conversion into functional materials through a new way is of great practical significance for its resource utilization. For the first time, nano zero-valent iron (nZVI)/biochar composites (Fe-RMC-850) were prepared by carbonizing Fe 3 O 4 -rabbit dung and used to activate PMS for degradation of sulfamethoxazole (SMX). The results showed that Fe-RMC-850 had high catalytic activity due to its rich pore, high graphitization and defective structure. When the dosage of Fe-RMC-850 and PMS were 0.3 g/L and 0.25 g/L respectively, the degradation rate of SMX could reach 100% within 20 min, and it still showed good catalytic stability after 5 cycles of experiments. The radical quenching, EPR and XPS results showed that radical and nonradical pathways acted synergistically in the degradation of SMX, in which nZVI, Fe 2+ -biochar and pyridinic N were used as the main active sites of the radical pathway. The nonradical pathway was attributed to the generation of C-O and COO by the oxygen-containing functional groups on the biochar surface. Moreover, the inherent P atoms formed P C and CPO 3 /C 2 PO 2 , thereby producing defective structures, while the graphitic carbon layer provided good electron transfer sites. Consequently, this study provides a nZVI-rabbit manure biochar composite PMS catalytic material with high organic pollutant degradation efficiency and offers a new option for the resource utilization of manure sources.
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CHEMOSPHERE
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2021
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IF 7.086
Rui Wang,Yuxuan Cai,Zhi Su,Xiaoli Ma,Wei Wu
Oily wastewater not only causes major environmental issues , but also threatens human health. Magnetic nanoparticles (MNPs) are an attractively alternative commercial demulsifiers for their recyclability and high surface area. The wettability and surface charge of magnetic materials are significant factors in oily wastewater treatment . However, the specific influence of surface charge on the demulsification performance has not been rigorously investigated. Herein, a series of MNPs coated by dimethyl-diallyl-ammonium chloride (PDDA) and fulvic acid (FA) (Fe 3 O 4 /FA/PDDA) with different surface positive charges were synthesized by adjusting the PDDA concentrations and applied in demulsification of hexadecane-water micro-emulsion. The oil-water separation efficiency ( Es ) was enhanced gradually with increasing the surface positive charge of demulsifiers. Derjaguin-Landau-Verwey-Overbeek (DLVO) theory confirmed that with increasing surface positive potential, the electrostatic attraction between demulsifiers and oil droplets increased, and thus, Es increased. In addition, the superior Es of Fe 3 O 4 /FA MNPs for hexadecyl trimethyl ammonium bromide (CTAB)-stabilized micro-emulsions and Fe 3 O 4 /FA/PDDA MNPs for sodium dodecyl sulfate (SDS)-stabilized micro-emulsions further confirmed that electrostatic force was critical in demulsification. The high positively charged Fe 3 O 4 /FA/PDDA MNPs can be used as an efficient and recyclable demulsifier for hexadecane-water micro-emulsion. This study provides a theoretical basis for designing demulsifiers.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Long Wu,Shuhong Zhou,Yonghuan Yun,Lin Zhu,Bei Li,Weimin Zhang
Based on the exchange of the DNA duplex-quadruplex, a multifunctional Pb(II) ion probe was fabricated, in which Pb(II) ion-driven DNA duplexes act as a bridge to link CdSe/ZnS-luminol and Fe 3 O 4 nanoparticles . As Pb(II) ion owns a strong binding capacity for G-quadruplex (G4), it can unwind the DNA duplex and release its complementary strand. In this strategy, three detection modes, chemiluminescence (CL), fluorescence (FL) assay and colorimetric assay (CA), can be realized via DNA duplex bridged CdSe/ZnS and Fe 3 O 4 nanocomposites . Amongst, FL assay shows the best detection performance, and it exhibits a linear range of 10 nM to 10 µM, as well as the limit of detection (LOD) with 1.63 nM (n = 3, ± 3.5%). In the selective analysis, Pb(II) ion can be specifically detected in the nine different interfering metal ions . Besides, the magnetic probe requires only one “mixing and separation” operation and greatly improves the detection efficiency. The three assays can be combined as one method to achieve a simple and rapid feature. Such a three-in-one analytical platform, therefore, can serve as a powerful tool for selective, accurate and sensitive detection of Pb(II) ion.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Ziyuan Gao,Huijuan Wu,Zhenxi Liu,Lizhi Liu,Ziqing Zeng,Xiaofeng Yang,Huiyong Wang,Juan Du,Baozhan Zheng,Yong Guo
In comparison with the poor stability, high cost, and difficult preparation of conventional natural enzymes, nanozymes have the obvious advantages of excellent stability, high catalytic activity, multifunctionality, and large-scale preparation. Herein, a series of Fe3O4 NPs-based magnetic composite with dual enzyme-like activities (peroxidase and oxidase) were successfully synthesized by the microwave-assisted method. Among them, the Fe3O4/Ag Au nanocomposite showed the highest peroxidase-like activity due to the synergistic catalytic effect of Ag and Au bimetallic modifications. Enzyme kinetic studies revealed good kinetic parameters of the Fe3O4/Ag Au nanocomposite for peroxidase, and it also exhibited a higher affinity for TMB compared to natural horseradish peroxidase. In addition, a method for effective dye degradation and selective detection of glutathione was constructed based on its peroxidase-like activity. Importantly, the remarkable magnetic separation property and the outstanding stability proved the extensive application prospects of the nanozymes in the remediation of water pollution and some biomarker-specific detection.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
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IF 8.2
Yaohui Dai,Ying Xu,Dexing Jiang,Long Bai,Zhiguo Li,Pengfei Huo,Changwei Liu,Yang Liu
Nowadays, various high-performance electromagnetic interference (EMI) shielding materials have enormous application potential in electronic field. However, traditional EMI shielding materials often have high conductivity, resulting in the serious mismatch between the impedance of the material surface and the free space, which will cause a large amount of reflection of electromagnetic (EM) waves, leading to secondary reflection pollution. In this paper, we report a novel flexible EMI shielding composite film with extremely low reflection loss and efficient EM wave absorption, which was prepared by assisted self-assembly based on simple vacuum filtration using carboxymethyl cellulose as the matrix and MWCNT@Fe 3 O 4 synthesized by chemical coprecipitation as the composite functional filler. By adjusting the Fe 3 O 4 coating degree of MWCNTs in the filler, the composite film achieved the construction of a conductive network with high Fe 3 O 4 content. Benefit by the good adaptability of conductivity and magnetic permeability, the composite film has good impedance matching ability and microwave absorption performance. The reflection loss of the composite film with the thickness of 28 μm in the X-band was only 0.23 dB, accounting for 1.7 % of the total loss. This work provides new insights for the development of EMI materials and effective mitigation secondary EM wave reflection pollution.
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危险品化学品经营许可证（带存储）