ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Rongqiang Liao,Dexi Jiang,Ying Liu,Pin Lv
In the present study, poly(ε-lysine)-cyclodextrin coated Fe 3 O 4 nanoparticles (PL-CD@Fe 3 O 4 ) were prepared by co-precipitation method. Then the PL-CD@Fe 3 O 4 nanoparticles were studied of the characterization and the selective separation performance for natural medicine (scutellarin). The experimental results showed that PL-CD@Fe 3 O 4 nanoparticles were successfully prepared with a particle size of about 30 nm and a saturation magnetization of 40 emu/g. When the nanoparticles were in the environment of pH = 7, the stability was the best, the adsorption capacity was the strongest, and the number of recyclable times was the most. Langmuir model deduced that the maximum adsorption capacity of the nanoparticles was 76.3 mg/g. In addition, the experimental results of using nanoparticles to separate SCU in the crude extract showed that the purity of SCU could be increased from 72.2% to 93.5% after repeated cyclic separation three times. Two dimensional NMR analysis showed that the selective separation of SCU by PL-CD@Fe 3 O 4 was mainly caused by the host–guest interaction between cyclodextrin and SCU. In conclusion, the PL-CD@Fe 3 O 4 nanoparticles are a very promising material for the extraction and separation of other similar natural drugs.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Mei Fang,Qi Li,Daozheng Yang,Bing Zhou,Yuezhan Feng,Chuntai Liu
Effective utilization of abundant solar energy can help alleviate the global energy shortage. In this work, a flexible sandwich structured transparent photothermal film was prepared by sequentially spray coating MXene conductive layer as core, and spin coating polydimethylsiloxane (PDMS)-Fe 3 O 4 protective layer as skin onto polycarbonate (PC) substrate. Due to the synergistic light-to-heat conversion effects of MXene and Fe 3 O 4 nanoparticles, as well as the thermal insulation effect of PDMS layer that prevent heat from diffusing into air, the obtained PC/MXene/PDMS-Fe 3 O 4 films (PMPF 0.5 ) exhibited a satisfying photothermal conversion performance (72.6 °C at 100 mW/cm 2 ) with high visible transmittance exceeding 54%. Moreover, the PDMS-Fe 3 O 4 coating endowed the film with high hydrophobicity (120°), expanding its application in humid environment. Combing with these excellent photothermal performance, transparency, flexibility and hydrophobicity, PMPF film exhibits a highly potential using in space thermal management, such as greenhouses.
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Nanoscale
·
2023
·Vol. 15
·期 18
·8255-8269
·
IF 6.7
Huanhuan Wang,Qi Qu,Jiangshan Gao,Yan He
Herein, Fe3O4@MnO2@Ni–Co/C composites derived from PBAs were successfully fabricated. Firstly, Ni–Co Prussian blue analogues (Ni–Co PBAs) were used as precursors to derive a carbon layer on their surface by annealing treatment and subsequently translated into MnO2@Ni–Co/C nanocubes after hydrothermal reactions. Fe3O4@MnO2@Ni–Co/C composites were finally obtained after depositing Fe3O4 nanoparticles through the annealing process. Their electromagnetic wave (EMW) absorption performance apparently enhanced, thanks to the excellent impedance matching and strong attenuation derived from the synergy between the dielectric loss and the magnetic loss. In particular, the minimum reflection loss (RLmin) of Fe3O4@MnO2@Ni–Co/C reached −41.2 dB with a thickness of 4.0 mm and the effective absorption bandwidth (EAB) reached 7.1 GHz with a thickness of 2.0 mm. Therefore, the results could be significant for synthesizing EMW absorbers with excellent performance, a broad bandwidth, strong absorption, thin thickness and light weight.
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PubMed
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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Materials Today Bio
·
2023
·
IF 8.2
Yang Luo,Yichen Chen,Zhaofeng Gu,Renhao Ni,Peipei Feng,Zeming Hu,Lei Song,Xiang Shen,Chenjie Gu,Jiajie Li,Tianyu Du,Lu Yang,Hua Zhang,Yabin Zhu
Engineered scaffolds are used for repairing damaged esophagus to allow the precise alignment and movement of smooth muscle for peristalsis. However, most of these scaffolds focus solely on inducing cell alignment through directional apparatus, often overlooking the promotion of muscle tissue formation and causing reduced esophageal muscle repair effectiveness. To address this issue, we first introduced aligned nano-ferroferric oxide (Fe 3 O 4 ) assemblies on a micropatterned poly(ethylene glycol) (PEG) hydrogel to form micro-/nano-stripes. Further modification using a gold coating was found to enhance cellular adhesion, orientation and organization within these micro-/nano-stripes, which consequently prevented excessive adhesion of smooth muscle cells (SMCs) to the thin PEG ridges, thereby effectively confining the cells to the Fe 3 O 4 -laid channels. This architectural design promotes the alignment of the cytoskeleton and elongation of actin filaments, leading to the organized formation of muscle bundles and a tendency for SMCs to adopt synthetic phenotypes. Muscle patches are harvested from the micro-/nano-stripes and transplanted into a rat esophageal defect model. In vivo experiments demonstrate the exceptional viability of these muscle patches and their ability to accelerate the regeneration of esophageal tissue. Overall, this study presents an efficient strategy for constructing muscle patches with directional alignment and muscle bundle formation of SMCs, holding significant promise for muscle tissue regeneration.
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PubMed
高影响因子
Water
·
2023
·Vol. 15
·期 23
·4084
·
IF 3.4
Zhi Zeng,Jiahui Xiao,Manzhi Li,Jiahui Wu,Taiping Zhang
The effect and mechanism of phenol removal by immobilized microorganisms in Fe3O4nanomaterial-modified pharmaceutical residue biochar was investigated to develop efficient biochar immobilizing microbial technology. Plant residue biochar (Y3, Y5, and Y7) was prepared fromAndrographis paniculataplant residues as the raw material at 300 °C, 500 °C, and 700 °C, respectively. Y7 was modified with Fe3O4nanomaterial (Fe-Y7). These four kinds of biochars were used as carriers to adsorb immobilizedAlcaligenes faecalisstrain JH1, JY3, JY5, JY7, and Fe-Y7 to investigate the mechanism of phenol removal, and eight cycles were performed to analyze their immobilization performance. Compared with suspended bacteria, biochar-immobilized bacteria could improve their tolerance in different environments. At temperatures of 25 °C to 40 °C, pH = 5~9, initial phenol concentration of 300–500 mg/L, and salinity of 3%, the bacteria could still grow and maintain strong activity within 48 h. The water-extractable organic carbon of biochar was also tested for the degradation of phenol by bacteria, which was found to have different stimulating effects on bacteria. In the batch experiments, as the number of cycles increased, the bacteria grew and adhered rapidly to the biochar, eventually forming a thick and sticky biofilm. After the sixth cycle, all the biochar-immobilized bacteria could remove 300 mg/L phenol solution within 12 h. The removal rate of phenol by JFe-Y7 was relatively fast in the eighth cycle. The results indicated that biochar-immobilized bacteria have good durability, stability, and reproducibility and that Fe3O4nanoparticle modification could improve the removal of phenol by increasing the phenol adsorption amount, the adsorption capacity of bacteria, and the enzymatic activity of bacteria.Keywords:biochar;immobilization;bacteria;phenol;mechanism
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Journal of Water Process Engineering
·
2023
·
IF 7
Hao Sun,Xiaoqing Li,Xiaobing Li
The asphaltene-rich alkaline-surfactant-polymer (ASP) flooding produced water has been identified with high interfacial stability and severe secondary emulsification, which poses great difficulties in its demulsification process. This leads to an urgent need to develop targeted and efficient demulsifiers. In this research, a novel polydopamine-polyquaternium modified Fe 3 O 4 (PQA-PDA@Fe 3 O 4 ) nanoparticle integrates the electrical neutralization, interfacial adsorption and magnetic aggregation functionalities was prepared to dispose this emulsion. Primarily, structural and surface properties of the PQA-PDA@Fe 3 O 4 demulsifier were systemically characterized by a series of analytical techniques, which presents its core-shell, hydrophilic and positively charged characters. When employing PQA-PDA@Fe 3 O 4 to treat the produced water that contained 500 mg/L emulsified oil, a demulsification efficiency of 90.5 % was achieved at 200 mg/L dosage. It was found that the PQA-PDA@Fe 3 O 4 nanoparticles could coalesce the fine oil droplets into large and dense aggregates, as demonstrated by the raised fractal dimension values. By monitoring the interfacial properties (interfacial tension, zeta potential and interfacial film elastic modulus) variations, the demulsification mechanism was further explored. The PQA-PDA@Fe 3 O 4 nanoparticle could spontaneously migrate to the oil/water interface and reassemble a loose interfacial film, thus leading the oil droplets destabilization and aggregation. Notably, the magnetic force between the PQA-PDA@Fe 3 O 4 nanoparticles significantly accelerates the oil droplets aggregation and inhibits the secondary emulsification process, so as to achieve the outstanding demulsification efficiency. Moreover, this PQA-PDA@Fe 3 O 4 nanoparticle exhibited acceptable magnetic recyclability. These results provided an effective and alternative protocol to demulsify the asphaltene-rich ASP flooding emulsions.
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高影响因子
Acta Biomaterialia
·
2023
·
IF 9.7
Xu Jin,Jie Shan,Jiemin Zhao,Tao Wang,Wei Zhang,Shijie Yang,Haisheng Qian,Liang Cheng,Xu-Lin Chen,Xianwen Wang
Infections and oxidative stress complicate wound healing. In recent years, nanomaterials with natural enzymatic activities have enabled the development of new antibacterial pathways. In this study, Cu-Fe 3 O 4 nanoclusters with multienzyme properties were synthesised. Interestingly, they exhibited activity similar to that of horseradish peroxidase (POD) in acidic environments but their functions resembled superoxide dismutase and catalase in neutral or weakly alkaline environments. In vitro studies have demonstrated the good free-radical scavenging activity of Cu-Fe 3 O 4 nanoclusters in a neutral environment. Under acidic conditions, Cu-Fe 3 O 4 nanoclusters combined with H 2 O 2 demonstrated good antibacterial activity against methicillin-resistant Staphylococcus aureus ( MRSA ) and Escherichia coli ( E. coli ). The combination of Cu-Fe 3 O 4 and H 2 O 2 was found to be effective in preventing MRSA infections and promoting wound healing in animal models. RNA sequencing (RNA-seq) technology revealed that chemodynamic therapy (CDT) using nanoparticles can interfere with metabolic processes such as galactose metabolism in MRSA bacteria, destroy the transport system on the surface of MRSA , and affect quorum sensing to hinder the formation of biofilms, thus achieving effective antibacterial efficacy. The use of Cu-Fe 3 O 4 nanoclusters as a novel class of multi-catalytically active nanozymes in the anti-infection of disease-causing pathogens and wound healing has significant potential. Statement of Significance Cu-Fe 3 O 4 nanoclusters with multienzyme properties were successfully prepared by a solvothermal method. Cu-Fe 3 O 4 nanoclusters exhibited horseradish peroxidase (POD)-like activity in acidic environments and also showed synergistic effects similar to superoxide dismutase peroxidase in neutral or weakly basic environments. More importantly, these Cu-Fe 3 O 4 nanoclusters showed high biosafety with no apparent in vivo toxicity. Chemodynamic therapy (CDT) using Cu-Fe 3 O 4 nanoclusters was revealed by RNA sequencing (RNA-Seq) technology to interfere with the metabolic processes of MRSA bacteria, such as galactose metabolism, disrupt the MRSA surface transport system, and impede biofilm formation, resulting in effective antibacterial efficacy. The use of Cu-Fe 3 O 4 nanoclusters for anti-infection and wound healing of pathogenic pathogens has significant potential as a novel class of multi-catalytic active nanoclusters.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Xing Gao,Weiying Feng,Hanxiao Zhang,Nanyan Weng,Shouliang Huo
Harmful cyanobacterial blooms in eutrophic water bodies have frequently occurred worldwide and become a major environmental concern. Therefore, it is imperative to develop a stable and efficient algaecide to solve this issue. In this study, our purpose was to investigate the efficacy and mechanism of a newly developed Cu 2+ doped Fe 3 O 4 @Biochar magnetic composite (Cu-Mag-BC) in in-situ inactivation of Microcystis aeruginosa ( M. aeruginosa ) . We successfully synthesized the Cu-Mag-BC by coating Cu 2+ onto Fe 3 O 4 @Biochar. Cu-Mag-BC exhibited superparamagnetic behavior and was uniformly impregnated by Cu 2+ . Cu-Mag-BC (5 mg/L), rapidly inactivated chlorophyll-a (Chl-a) in M. aeruginosa with low Fe and Cu leaching, during which time the OD 264 value and malondialdehyde (MDA) content increased, while the activities of superoxide dismutase (SOD) and catalase (CAT) first increased and then decreased, due to oxidative stress induced by over-generated reactive oxygen species (ROS). Quantitative results showed that ·O 2 − and ·OH were the main ROS species produced from Cu-Mag-BC. Inactivation efficiency was maintained at approximately 80 % after three consecutive runs and total Chl-a removal efficiency reached 2.84 g/g, indicating good reusability and stability. A possible inactivation mechanism is proposed; amino groups and adipose chain were the primary oxidation sites. Thus, Cu-Mag-BC shows potential as a candidate for simultaneously inactivating harmful cyanobacteria and preventing secondary pollution.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weisen Yang,Yifei Liu,Yaqin Zhu,Wenlong Jiang,Fengshuo Shi,Jiapeng Hu,Shaohua Jiang,Shaoju Jian
Aquatic ecosystem contaminated by organic dyes is one of the most crucial issues plaguing people worldwide, while water remediation through adsorption technology is the most sustainable option. Herein, two chitosan-based adsorbents were successfully fabricated by a facile one-step method under alkaline condition via electrospraying technology, then the above two materials were cross-linked with epichlorohydrin and grafted triethylenetetramine to prepare two kinds magnetic Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres for remediation of anion dyes namely Congo red (CR) in wastewater respectively. The morphology features, structure, composition, thermal stability, and pore diameter of the two adsorbents were acquired by SEM coupled with EDX, XRD, FTIR, TGA, and BET. The adsorption behavior of Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres towards CR from water was systematically evaluated. The determined isoelectric points (pHpzc) of Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 are orderly 7.4 and 7.8. The results confirmed that the CR remediation process can be simulated by PSO kinetic model ( R 2 > 0.995) along with Langmuir isotherm ( R 2 > 0.998) with maximal CR adsorption amounts by Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres of 1145.42 and 617.28 mg g −1 at pH = 7 and T = 25 °C, respectively. The negative Δ G 0 , positive Δ H 0 (28.65 and 8.02 kJ mol −1 ), and positive Δ S 0 (112.29 and 62.71 J mol −1 K −1 ) signified that the adsorption of CR onto Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres surface was spontaneous and endothermic in nature. After four consecutive cycles, both magnetic microspheres remained a superior CR removal performance, indicative of the stability and recyclability of the adsorbents.
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高影响因子
Coatings
·
2023
·Vol. 13
·期 9
·1557
·
IF 3.4
Yan Gao,Xin Chen,Ping Xu,Jie Chen,Shihua Yu,Zhigang Liu,Xiaodan Zeng
A novel magnetic fluorescent nanoprobe (Fe3O4@ZnS@MPS(MFNPs)) was synthesized, which recognized and cooperated with Ag+ions, and a rapid method for detecting Ag+was established in solution. It was found by fluorescence spectroscopy analysis that the MFNPs could detect Ag+in PBS solution and, upon addition of Ag+ions, the fluorescence (FL) of MFNPs could be quenched significantly. The sensor has a low limit of detection (LOD) of 7.04 µM for Ag+. The results showed that MFNPs were extremely specific and sensitive for the quantitative detection of Ag+over a wide pH range. Then, the recognition mechanism between MFNPs and guest Ag+was explored via measures of infrared spectroscopy and electron microscopy. It was speculated that the oxygen atoms in the sulfonic acid group cooperated with Ag+to form a synergistic complexation. The assay was successfully used to determine the content of Ag+ in real samples.Keywords:magnetic fluorescent nanosensor;selective recognition;silver ion;3-sulfhydryl-1-propane sodium (MPS)
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Sustainability
·
2023
·Vol. 15
·期 17
·13279
·
IF 3.9
Ke Li,Miaomiao Chen,Lei Chen,Songying Zhao,Wencong Xue,Yanchao Han
In this study, a novel Fe3O4/Ag3PO4/g-C3N4magnetic composite photocatalyst was successfully synthesized, tailored specifically for the visible light-driven photocatalytic degradation of sulfonamide antibiotics, more precisely, sulfamethazine (SMZ). To analyze the fabricated samples, characterization techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), and UV-vis diffuse reflectance spectra (UV-vis) were systematically employed. The composite showcased efficient visible-light absorption and charge separation, with its peak photocatalytic performance recorded at a solution pH value of 6.0. Significantly, the Fe3O4/Ag3PO4/g-C3N4magnetic composite photocatalyst displayed excellent stability and recyclability, consistently maintaining a high degradation efficiency of over 97% even after five consecutive cycles. Further experimentation with radical scavengers confirmed a significant decrease in photocatalytic activity, establishing that superoxide radicals (•O2−) and photo-generated holes (h+) are the primary active species during the degradation of SMZ. Overall, it provides a crucial understanding regarding the photocatalytic decomposition of sulfonamide antibiotics using magnetic composite photocatalysts. It also emphasizes the promising potential of the Fe3O4/Ag3PO4/g-C3N4composite for tangible applications in environmental remediation.Keywords:visible light;photocatalysis;Fe3O4/Ag3PO4/g-C3N4;sulfonamide
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危险品化学品经营许可证（带存储）