INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 18
·10743
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IF 6.208
Teng Wang,Xi Hu,Yujun Yang,Qing Wu,Chengdian He,Xiong He,Zhenyu Wang,Xiang Mao
Metal-based enzyme mimics are considered to be acceptable agents in terms of their biomedical and biological properties; among them, iron oxides (Fe3O4) are treated as basement in fabricating heterogeneous composites through variable valency integrations. In this work, we have established a facile approach for constructing Fe3O4@Ag composite through assembling Fe3O4and Ag together via polyethyleneimine ethylenediamine (PEI) linkages. The obtained Fe3O4@PEI@Ag structure conveys several hundred nanometers (~150 nm). The absorption peak at 652 nm is utilized for confirming the peroxidase-like activity of Fe3O4@PEI@Ag structure by catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. The Michaelis–Menten parameters (Km) of 1.192 mM and 0.302 mM show the higher catalytic activity and strong affinity toward H2O2and TMB, respectively. The maximum velocity (Vmax) value of 1.299 × 10−7M∙s−1and 1.163 × 10−7M∙s−1confirm the efficiency of Fe3O4@PEI@Ag structure. The biocompatibility illustrates almost 100% cell viability. Being treated as one simple colorimetric sensor, it shows relative selectivity and sensitivity toward the detection of glucose based on glucose oxidase. By using indocyanine green (ICG) molecule as an additional factor, a remarkable temperature elevation is observed in Fe3O4@PEI@Ag@ICG with increments of 21.6 °C, and the absorption peak is nearby 870 nm. This implies that the multifunctional Fe3O4@PEI@Ag structure could be an alternative substrate for formatting acceptable agents in biomedicine and biotechnology with enzymatic and photothermal properties.Keywords:Fe3O4@PEI@Ag;assembling process;enzymatic;catalytic performance;photothermal property
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Yonghong Wang,Lecheng Sheng,Xinru Zhang,Jinping Li,Rong Wang
Carbon molecular sieve (CMS) membranes have great promise in CO 2 capture. However, tortuous transport passageways restrict the enhancement in the permeability due to the presence of disordered porous structure and dead-end pore. Herein, the growth of ZIF-8 layer on the surface of Fe 3 O 4 formed magnetic core-shell Fe 3 O 4 @ZIF-8 particles, which were fixed into 6FDA/ODA:DABA polyimides under magnetic field-induction to fabricate a precursor membrane with vertically oriented chain-like particles. It was then pyrolyzed to form hybrid carbon molecular sieve (HCMS) membranes with ordered microporous structure under high temperature conditions. The cross-section scanning electron microscopy images and N 2 adsorption for resultant HCMS membranes indicate that Fe 3 O 4 @ZIF-8-derived carbons frameworks were vertically oriented to form the ordered microporous structure, which also had good compatibility with carbon matrix stemmed from 6FDA/ODA:DABA polyimides. The as-prepared HCMS membranes embedded with 5 wt% Fe 3 O 4 @ZIF-8 manifested a highest gas separation performance (permeability of 5130 Barrer; CO 2 /N 2 selectivity of 29; CO 2 /CH 4 selectivity of 48), outperforming the pristine CMS membranes, which were near and beyond 2019 CO 2 /N 2 and CO 2 /CH 4 upper bounds, separately. These good separation performances resulted from vertical chain-like microporous particles, which provided fast transport channels to accelerate CO 2 diffusion rate. In addition, we supposed that Fe 3 O 4 prevent ZIF-8 frameworks from destruction during the pyrolysis and promote the size screening capability. More importantly, this membrane exhibited excellent aging resistance over 30 days aging testing compared to pristine CMS membranes. Therefore, it affords a feasible way for carbon capture from flue gas and natural gas.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Jie Tian,Junyan Wei,Yeping Liang,Ruixue Guo,Beibei Li,Ruijuan Qu,Dongmei Zhou,Zunyao Wang,Ping Sun
This study aimed to investigate the catalytic performance of Fe 3 O 4 /ZnO in the ozonation of 1-hexyl-3-methyl imidazolium bromide ([HMIM]Br). The Fe 3 O 4 /ZnO composite was prepared by a quick and convenient two-step coprecipitation method, and the optimum mass ratio of Fe 3 O 4 :ZnO was determined as 1:8. The structure, surface morphology, and chemical composition of the Fe 3 O 4 /ZnO composites were studied by characterization methods. The degradation efficiency of [HMIM]Br reached 96% in 5 min in catalytic ozonation with the Fe 3 O 4 /ZnO composite, an increase of 20% compared with ozonation alone. Moreover, the pseudo-first-order rate constant was 1.5 times higher than ozonation alone. With the increase in the catalyst dosage, the degradation efficiency of [HMIM]Br first improved and then decreased, and the optimum dosage was 0.25 g/L. The increase in pH value and the introduction of Cu 2+ effectively promoted the catalytic ozonation of [HMIM]Br with Fe 3 O 4 /ZnO, while the reducing inorganic ions inhibited the ozonation reaction. Different water matrices had little influence on the catalytic performance of Fe 3 O 4 /ZnO. Radical scavenging and EPR experiments showed that hydroxyl radicals (•OH), superoxide radicals (O 2 •- ) and singlet oxygen ( 1 O 2 ) were the main active species in this system. Meanwhile, product identification showed that the degradation of [HMIM]Br mainly included hydroxylation, imidazole ring cleavage and bond cleavage. Toxicity prediction illustrated that the catalytic ozonation of [HMIM]Br could effectively reduce its toxicity. The efficiency, toxicity, reusability, and stability experiments suggested that the developed catalyst, Fe 3 O 4 /ZnO composite, had promising prospects in catalytic ozonation.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 20
·12301
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IF 6.208
Xiaoling Xu,Xiaoke Tian,Guangxu Bo,Xingjian Su,Jinyong Yan,Yunjun Yan
Sustainable renewable polymer foam used as a lightweight porous skeleton for microwave absorption is a novel strategy that can effectively solve the problems of the large surface density, high additive amount, and narrow absorbing band of absorbing materials. In this article, novel renewable microwave-absorbing foams were prepared usingSapiumse biferumkernel oil-based polyurethane foam (BPUF) as porous matrix and Fe3O4-nanoparticles as magnetic absorbents. The microstructure and the microwave absorption performance, the structural effects on the properties, and electromagnetic mechanism of the magnetic BPUF (mBPUF) were systematically characterized and analyzed. The results show that the mBPUF displayed a porous hierarchical structure and was multi-interfacial, which provided a skeleton and matching layer for the Fe3O4nanoparticles. The effective reflection loss (RL≤ −10 dB) frequency of the mBPUF was from 4.16 GHz to 18 GHz with only 9 wt% content of Fe3O4nanoparticles at a thickness of 1.5~5 mm. The surface density of the mBPUF coatings was less than 0.5 kg/cm2at a thickness of 1.8 mm. The lightweight characteristics and broadband absorption were attributed to the porous hierarchical structures and the dielectric combined with the magnetic loss effect. It indicates that the mBPUF is a prospective broadband-absorbing material in the field of lightweight stealth materials.Keywords:bio-based polyurethane;lightweight magnetic foam;hierarchical microstructure;microwave absorption mechanism
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DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Junfeng Zhao,XueDong Xie,Meiqi Xi,Zichen Wang,Shilong Yin,Zhefei Wang,Gang Yang
Herein, we reported a salt-template approach for the construction of hybrid materials composed of Fe 3 O 4 nanoparticles embedded in hierarchical porous carbon . Benefiting from the combined effect of sufficient space to alleviate the volume expansion of Fe 3 O 4 and the good electronic conductivity of three dimensional interconnected framework, the hybrid materials deliver excellent performance. HPCs/Fe 3 O 4 -2 anode displays a high reversible capacity of 1018.4 mAh g −1 after 250 cycles at 0.2 A g −1 , and an excellent cycling-life stability of 415.4 mAh g −1 after 1000 cycles at a high current density of 5 A g −1 , suggesting the potential application in LIBs anode. Such an effective and simple approach to construct carbon-based hybrid materials can be further extended to fabricate other anode and cathode materials with excellent performance.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Ying Chen,Fengyuan Zhang,Xiaoshuang Shi,Mingyi Lu,Kang Qin,Quan Feng,Rongbo Guo
This paper aims to improve the biological nitrogen removal performance by using magnetic polystyrene composite microparticles (PS@Fe 3 O 4 ). Three types of PS@Fe 3 O 4 with different surface morphologies were prepared by in-situ emulsion polymerization . Then, the optimum was creatively used as a biofilm carrier to form magnetic activated sludge (MAS) in lab-scale reactors. Compared to the conventional activated sludge , the utilization of PS@Fe 3 O 4 accelerated the sludge settling velocity to 0.76 m/h. In addition, the ammonium nitrogen removal, total nitrogen removal and simultaneous nitrification and denitrification improved by 7.08%, 24.27% and 19.53%, respectively. The dissolved oxygen concentration and pH were observed to reveal the effect of PS@Fe 3 O 4 on the nitrogen removal process. Based on microbial community analysis, there were more nitrifying and denitrifying bacteria in the MAS. Therefore, the novel developed PS@Fe 3 O 4 can be a promising utilization material as a biofilm carrier for biological wastewater treatment .
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WASTE MANAGEMENT
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2022
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IF 8.816
Lanting Wang,Zhongfang Lei,Zhenya Zhang,Kazuya Shimizu,Tian Yuan,Shengnan Li,Siting Liu
Fe 3 O 4 supplementation has been reported as a high-efficient approach to enhance biogas production in anaerobic digestion (AD). Volatile fatty acids (VFAs), especially acetic acid (HAc), are considered as important products in acidification process of AD. However, the possible mechanisms involved in promotion effect of Fe 3 O 4 on HAc production in hydrolysis and acidification processes of AD have not been comprehensively studied. This study first investigated the promotion effect of Fe 3 O 4 on hydrolysis, acidogenesis and acetogenesis stages of AD and proposed the underlying mechanisms, using food waste (FW) as the feedstock, which is considered as the most suitable substrate for VFAs production. Results indicated that the HAc production (77.38 g-C/kg-VS) was enhanced by 79 % in AD of FW with addition of 10 g/L Fe 3 O 4 . The duration to reach the maximum HAc production was also shortened from 14 days to 10 days. The AD tests using model substrates revealed that Fe 3 O 4 enhanced hydrolysis, acidogenesis, and degradation of propionic acid, thus resulting in enhanced HAc production. The enhanced activities of hydrolytic and acid-forming enzymes, and electron transport system (ETS) with Fe 3 O 4 addition further demonstrated its function as an electron acceptor to stimulate electron transfer and accelerate microbial metabolisms in AD, which contributed to the enhanced HAc production from FW.
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ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Wencheng Ma,Shaobo Zhang,Yiru Chen,Dan Zhong,Qinghui Du,Jinxin Li,Ru Li,Xuan Du,Jingna Zhang,Taiping Yu
In this study, lignite activated coke (LAC) was used as the carrier for the first time, Fe 3 O 4 –CuO composite metal oxide was used as the main active material, and the nano-scale magnetic supported composite metal oxide Fe 3 O 4 –CuO@LAC catalyst was synthesized for the first time, which can effectively activate the active oxygen in peroxodisulfate (PS). XRD, FTIR , BET, SEM , XPS and other analysis results showed that there was particulate matter with spherical structure on the surface of the active coke, and its diffraction peaks matched well with the characteristic peaks of Fe 3 O 4 and CuO, and it was a mesoporous structure with a specific surface area of 619.090 m 2 g −1 . By optimizing the experimental conditions, the results showed that more than 92% of hydroquinone can be removed under the conditions of hydroquinone concentration of 50 mg/L, pH = 5, adding 0.1 g/L catalyst and 3 mmol/L PS. EPR and quenching experiments proved that there were four reactive oxygen species in the reaction system ·OH, SO 4 − ·, O 2 − · and 1 O 2 . According to the degradation products of hydroquinone detected by LC-MS, the possible degradation path was deduced which laid a foundation for solving the problem of difficult treatment of phenol-containing wastewater in coal chemical industry.
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SYNTHETIC METALS
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2022
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IF 4
Afzal Ali,Tahir Raza,Adeel Ahmed,Muhammad Safdar Ali,Changbao Liu,Dong Li,Chunhu Li
The intentional discharge of polycyclic aromatic hydrocarbons (PAHs) into the aquatic system from different industrial units has posed a serious threat to human health. To address the concerns associated with PAHs misuse, an efficient approach for developing affordable photocatalyst materials for PAHs degradation is much needed. In this study, we have explored co-precipitation and hydrothermal methods to synthesize Fe 3 O 4 /GO/g-C 3 N 4 ternary composites and utilized them as photocatalyst materials for the degradation of naphthalene. Fe 3 O 4 /GO/g-C 3 N 4 nanocomposite demonstrated superior degradation performance, with 87.56% naphthalene degradation achieved in 140 min under visible light irradiation, far outperforming Fe 3 O 4 /GO (77.42%) and Fe 3 O 4 (69.42%). The enhanced degradation of naphthalene by the Fe 3 O 4 /GO/g-C 3 N 4 composite was credited to the effective charge carrier separation and increased visible-light absorption induced by GO and g-C 3 N 4 . The impact of operating parameters on the catalytic efficiency of the Fe 3 O 4 /GO/g-C 3 N 4 catalyst was also examined. The findings of this study revealed that lower naphthalene concentration (10 mg/L), higher catalyst dosage (40 mg), and moderate pH conditions (pH 5 to pH 9) were favorable for photocatalytic activity. The degradation of naphthalene followed pseudo-first-order kinetics with a rate constant value of 0.0137 min −1 . The generation of radicals ( • OH and O 2 •− ) liable for the degradation of naphthalene was corroborated through electron paramagnetic resonance analysis and quenching experiments. Furthermore, the Fe 3 O 4 /GO/g-C 3 N 4 photocatalyst exhibited promising reusability in five consecutive cyclic runs, validating its excellent stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Mei Wu,Xiaohui Liang,Yu Zheng,Congyi Qian,Dunhui Wang
The core@shell structures and compositions hold greatly potential for microwave absorption. Herein, the Fe 3 O 4 @1T/2H-MoS 2 nanocomposites with core@shell structures were successfully fabricated through a simple hydrothermal process. The impedance matching was significantly promoted by introducing magnetic Fe 3 O 4 nanoparticles and designing the flower-like 1 T/2 H-MoS 2 with core@shell structures. It can be seen that the regulation of Fe 3 O 4 contents play an important role in electromagnetic parameters and microwave absorption performances of the Fe 3 O 4 @1T/2H-MoS 2 nanocomposites with core@shell structures. The Fe 3 O 4 @1T/2H-MoS 2 nanocomposites with core@shell structures with corresponding thickness of 2.67 mm display the minimum reflection loss (RL min ) value of − 56.22 dB at 10.36 GHz (in X band), and the maximum absorption bandwidth (AB max ) extend up to 4.76 GHz with thickness of only 1.89 mm. This result is of great significance for improving microwave absorbing performance, and the nanocomposites can be regarded as candidates for high-quality absorbing materials.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Zhengwen Wei,Xiang-fei Lü,Wei Wang,Giuseppe Mele,Yifan Du,Zhen-Yi Jiang
Due to the toxicity and harmful of phenanthrene (PHE) pollutant to human health and the ecosystem, it is extremely urgent to find an accessible technique to efficiently alleviate PHE contamination risk. The Fe 3 O 4 -1.5benzhydrylamine (Fe 3 O 4 -1.5BENZHY) was successfully fabricated via the silane coupling and Schiff base substitution reaction. The Fe 3 O 4 matrix facilitated the practical recycling efficiency and the aromatic nucleus of the benzhydrylamine could form π-π interaction with PHE molecular to improve adsorption performance. The benzhydrylamine loading amount and synthesis strategy could influence the adsorption capacity of the fabricated magnetic nanocomposite to some extent. Multiple characterization techniques were utilized to assess the physical and chemical properties of the magnetic nanocomposite. The density functional theory (DFT) calculations combined with post-characterization not only revealed the π–π interaction of Fe 3 O 4 -1.5BENZHY and PHE was valid and usually existed in offset parallel stacking form, but also provided a deeper understanding of the underlying mechanism. Moreover, the stability and adsorption energy for all different configuration modes were evaluated by the LUMO-HOMO energy gap (E GAP ) and electric distribution. The Fe 3 O 4 -1.5BENZHY exhibited a homogeneous surface and PHE molecules were adsorbed in a monolayer form, its adsorption capacity (26.07 mg g −1 ) was significantly higher compared with original Fe 3 O 4 (13.28 mg g −1 ). This work helps broaden insight on the molecular binding mechanism of the adsorbent/adsorbate system and expands the modification strategies for magnetic oxide to achieve high-efficiency adsorption of hazardous polycyclic aromatic hydrocarbons.
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ANALYTICA CHIMICA ACTA
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2022
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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.
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危险品化学品经营许可证（带存储）