CHEMICAL PHYSICS LETTERS
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2021
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IF 2.328
Xiaomin Kong,Runying Bai,Shuailin Wang,Bo Wu,Ruzhang Zhang,Huidong Li
Considering the phosphorus pollution in the water and the shortage of phosphate rock resources, the TiO 2 */Fe 3 O 4 composite is prepared by sol–gel method to adsorb and recover phosphate from wastewater. The physio-chemical properties combined with adsorption experiment results show that the phosphate adsorption of TiO 2 */Fe 3 O 4 is mono-layer chemical adsorption with electrostatic attraction and ligand exchange. The adsorption capacity reaches 64.6 mg/g at 25 °C in pH 6 and the phosphate recovery rate is over 85% after 5 recycling times. The TiO 2 */Fe 3 O 4 , which is easily separated magnetically from water with excellent phosphate removal performance of municipal sewage, is a promising specific phosphate adsorbent.
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Royal Society Open Science
·
2021
·Vol. 8
·期 12
·
IF 2.963
Xiaolei Ma,Duomo Duan,Xunliang Wang,Junrui Cao,Jinquan Qiu,Baolong Xie
Alkali-surfactant-polymer flooding technology is widely employed to extract crude oil to enhance its production. The bacterial strain Rhodococcus erythropolis SY095 has shown high degradation activity of alkane of crude oil. In the past, many treatment strategies have been implemented to reduce oil concentration in wastewater. Previous studies mainly focused on the extracellular products of Erythrococcus rather than its degradation properties. In the current study, we designed an immobilization method to modify the surface of R. erythropolis SY095 with functional Fe3O4 nanoparticles (NPs) for biodegradation of crude oil and separation of the immobilized bacteria after degradation. We characterize the synthesized NPs through various methods, including scanning electron microscope energy-dispersive spectrometer, Fourier transform infrared spectroscopy, X-ray diffraction (XRD) and a vibrating sample magnetometer. We found that the size of the synthesized NPs was approximately 100 nm. Our results showed that R. erythropolis SY095 was successfully coated with functional magnetic NPs (MNPs) that could be easily separated from the solution via the application of an external magnetic field. The coated cells had a high tolerance for heavy metals. Our findings demonstrated that the immobilization of MNPs to bacterial surfaces is a promising approach for the degradation of crude oil.
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ENVIRONMENTAL RESEARCH
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2023
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IF 8.3
Huajun Feng,Anan Jin,Xianbin Yin,Zhicheng Hong,Yangcheng Ding,Nannan Zhao,Yufan Chen,Yifeng Zhang
The presence of excessive concentrations of nitrate poses a threat to both the environment and human health, and the bioelectrochemical systems (BESs) are attractive green technologies for nitrate removal. However, the denitrification efficiency in the BESs is still limited by slow biofilm formation and nitrate removal. In this work, we demonstrate the efficacy of novel combination of magnetite nanoparticles (nano-Fe 3 O 4 ) with the anode-cathode polarity period reversal (PPR-Fe 3 O 4 ) for improving the performance of BESs. After only two-week cultivation, the highest cathodic current density (7.71 ± 1.01 A m −2 ) and NO 3 − -N removal rate (8.19 ± 0.97 g m −2 d −1 ) reported to date were obtained in the PPR-Fe 3 O 4 process (i.e., polarity period reversal with nano-Fe 3 O 4 added) at applied working voltage of −0.2 and −0.5 V (vs Ag/AgCl) under bioanodic and biocathodic conditions, respectively. Compared with the polarity reversal once only process, the PPR process (i.e., polarity period reversal in the absence of nano-Fe 3 O 4 ) enhanced bioelectroactivity through increasing biofilm biomass and altering microbial community structure. Nano-Fe 3 O 4 could enhance extracellular electron transfer as a result of promoting the formation of extracellular polymers containing Fe 3 O 4 and reducing charge transfer resistance of bioelectrodes. This work develops a novel biocathode denitrification strategy to achieve efficient nitrate removal after rapid cultivation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Qiyilan Guang,Jianwei Zhang,Baoyu Huang,Nan Wang,Xiaogan Li
The WS 2 microflakes heterostructured with n-type Fe 3 O 4 have been explored herein for chemiresistive-type NH 3 sensors at room temperature . The microjunctions formed between the two heteromaterials WS 2 and Fe 3 O 4 effectively modulate the response of the sensor to ammonia. The Fe 3 O 4 /WS 2 heterostructured sensor found a three times higher response relative to the single WS 2 based one. The optimized concentration of Fe 3 O 4 in the heterostructure sample is 0.2 at%. The sensor also indicates an excellent selectivity to several volatile organic compounds (VOCs) such as formaldehyde, toluene, methanol, ethanol, and acetone . The sensing mechanism of the sensor to NH 3 at room temperature were examined using in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). It reveals that the redox reactions of NH 3 on Fe 3 O 4 /WS 2 were more prominent compared to the WS 2 alone. The enhanced sensitivity of the Fe 3 O 4 /WS 2 based sensor could thus be attributed to the joint effects of both electronic and chemical sensitizations induced by the Fe 3 O 4 /WS 2 heterostructures.
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ACS Applied Bio Materials
·
2021
·
IF 0
Guowen Qian,Lemin Zhang,Xia Li,Cijun Shuai,Xiupeng Wang
Magnetite (Fe3O4) nanoparticles as drug carriers can achieve precise drug target due to their magnetic property. However, they are easy to aggregate in the physiological environment, which obviously limits their application in drug delivery. The development of the Fe-MIL-88B-derived method to construct the Fe3O4-loaded mesoporous carbon (Fe3O4/carbon) system is a feasible strategy to solve the issue. First, iron atoms evenly distribute in the organic links through coordination bonds in Fe-MIL-88B. After the carbonization of Fe-MIL-88B, mesoporous carbon acts as a barrier to prevent the aggregation of Fe3O4 nanoparticles. Herein, Fe-MIL-88B particles were fabricated by the hydrothermal method and then pyrolyzed to construct Fe3O4/carbon systems. Results showed that Fe3O4 nanoparticles uniformly in situ grew on mesoporous carbon generated by the carbonization of organic components. More encouragingly, the Fe3O4/carbon system loaded with DOX demonstrated pH-responsive DOX release, efficient delivery of DOX into cancer cells, and significant cancer cell killing ability. Therefore, the Fe3O4/carbon systems prepared by the Fe-MIL-88B-derived method might open up a way for targeted and controlled drug delivery.
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Journal of Physical Chemistry C
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2021
·
IF 4.126
Yichun Peng,Shenghua Ma,Zhihua Shao,Qiangzhou Rong
Photoacoustic imaging is a new noninvasive imaging technology that combines the advantages of optical imaging and ultrasound imaging. Using materials with good photoacoustic effects can improve imaging contrast and resolution. With the development of photoacoustic imaging in the field of medical treatment, research pertaining to photoacoustic functional materials is progressing continuously. In this study, we effectively synthesize a multifunctional photoacoustic and magnetocaloric nanomaterial, i.e., SiO2/C/Fe3O4 via a one-step synthesis method. For theoretical analysis, the finite elemental analysis method is used to simulate the photoacoustic and magnetocaloric signals of the material. To obtain the experimental results, the SiO2/C/Fe3O4 suspension is excited by a 532 nm nanosecond pulsed laser irradiation to obtain the photoacoustic signal of the material. The temperature increase of the material is measured under a 365 kHz alternating magnetic field. The results show that SiO2/C/Fe3O4 exhibits good photoacoustic and magnetocaloric effects, rendering it feasible as a contrast agent for photoacoustic imaging and magnetocaloric therapy.
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Journal of Materiomics
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2021
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IF 6.425
Jialiang Pan,Rujing Zhang,Jun Ling,Min Wang,Zechen Li,Zhen Zhen,Limin He,Hongwei Zhu
To substantially prevent electromagnetic threatens, microwave absorbing materials (MAMs) are required to eliminate surplus electromagnetic waves. As a typical MAM, Fe 3 O 4 particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric loss. However, the necessary high mass fraction significantly limited its applications, thus Fe 3 O 4 nanostructures have been extensively investigated to overcome this problem. In this work, uniform Fe 3 O 4 nanobelts were prepared by electrospinning and two-step thermal treatment. By controlling the composition and viscosity of the electrospinning precursor solution, Fe 3 O 4 nanobelts with tunable lateral sizes (200 nm–1 μm) were obtained. The samples with low content (only 16.7 wt%) Fe 3 O 4 exhibited wide maximum effective absorbing bandwidths (EAB) over 3 GHz, and Fe 3 O 4 nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 GHz. Meanwhile, Fe 3 O 4 nanobelts with smaller lateral sizes presented superior reflection loss properties, the lowest reflection loss reached −53.93 dB at 10.10 GHz, while the maximum EAB was up to 2.98 GHz. The excellent microwave reflection loss of Fe 3 O 4 nanobelts was contributed to the enhanced synergistic effect of magnetic loss, dielectric loss, and impedance matching, originated from the hierarchically cross-linked networks and shape anisotropies. This study could broaden the practical applications of magnetic absorbers, and provided an approach for the development of shape anisotropic magnetic materials.
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ACS Applied Nano Materials
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2021
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IF 5.097
Jiawei Lu,Youran Li,Huilin Zhu,Guiyang Shi
Nanoscale particle-based enzyme immobilization carries a risk of dissolving or breaking the material when applied. One effective strategy to improve the stability and functionality of this type of nanomaterial is compounding with polymers. In this study, Fe3O4 nanoparticles were synthesized and coated with SiO2, after which magnetic hollow composite beads with nanoscale porous structures, named, lipase/Fe3O4/PAN (L/FP), were fabricated by compounding polyacrylonitrile and SiO2-coated Fe3O4 nanoparticles to immobilize Candida antarctica lipase B (CALB) in one step. Fourier transform infrared spectroscopy, scanning electron microscopy, the Brunauer–Emmett–Teller method, vibrating sample magnetometer measurements, and thermogravimetry analysis were used to analyze the structure of hollow beads. It was found that composite beads retained nanoscale channels and had a larger specific surface area (27.2 m2/g), a higher pore volume (0.09 cm3/g), and better saturation magnetization values (9.8 emu/g) than PAN hollow beads (6.2 m2/g, 0.03 cm3/g, and 0 emu/g, respectively). After optimizing fabrication and immobilization conditions, L/FP showed a high lipase capacity (50 mg protein/g support) at 2 mg/mL lipase, and the immobilized yield was up to 98.4% when the mass ratio of the starting lipase and support was 1.3 (mg lipase/g support). The immobilized lipase in L/FP showed greater thermal stability and resistance to alkali than free CALB. L/FP also had good stability in most organic solvents. In all tested cycles, it also had better reusability (78.4, 47.2, and 23.8% retained activity after 10, 20, and 30 cycles, respectively) in ester hydrolysis than CALB-immobilized Fe3O4 nanoparticles or PAN beads and had higher activity than the commercial immobilized lipase (Novo 435).
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Feng Wei,Xinyu Cui,Zhao Wang,Changchang Dong,Jiadong Li,Xiaojun Han
Antibacterial agents with enzyme-like properties and bacteria-binding ability have provided an alternative method to efficiently disinfect drug-resistance microorganism. Herein, a Fe 3 O 4 @MoS 2 -Ag nanozyme with defect-rich rough surface was constructed by a simple hydrothermal method and in-situ photodeposition of Ag nanoparticles. The nanozyme exhibited good antibacterial performance against E. coli (~69.4%) by the generated ROS and released Ag + , while the nanozyme could further achieve an excellent synergistic disinfection (~100%) by combining with the near-infrared photothermal property of Fe 3 O 4 @MoS 2 -Ag. The antibacterial mechanism study showed that the antibacterial process was determined by the collaborative work of peroxidase-like activity, photothermal effect and leakage of Ag + . The defect-rich rough surface of MoS 2 layers facilitated the capture of bacteria, which enhanced the accurate and rapid attack of OH and Ag + to the membrane of E. coli with the assistance of local hyperthermia. This method showed broad-spectrum antibacterial performance against Gram-negative bacteria, Gram-positive bacteria, drug-resistant bacteria and fungal bacteria. Meanwhile, the magnetism of Fe 3 O 4 was used to recycle the nanozyme. This work showed great potential of engineered nanozymes for efficient disinfection treatment.
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Catalysts
·
2021
·Vol. 11
·期 10
·1219
·
IF 4.146
Jun Qiao,Tian Wang,Kai Zheng,Enmu Zhou,Chao Shen,Aiquan Jia,Qianfeng Zhang
A novel reusable Fe3O4@NC@Pt heterogeneous catalyst was synthesized by immobilizing platinum on nitrogen-doped carbon magnetic nanostructures. It was characterized by infrared analysis (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). The catalytic efficiency of Fe3O4@NC@Pt was investigated by reduction of nitro aromatic compounds. The catalyst showed good catalytic activity, wide range of substrates, and good chemical selectivity, especially for the substrates of compounds containing halide and carbonyl groups. The magnetically catalyst can readily be reused up to ten cycles without loss of catalytic activity. Moreover, the key pharmaceutical intermediateLorlatinican be facilely achieved through this strategy.Keywords:reusable;magnetic;platinum;selective reduction;nitroarenes
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Tingting Jiang,Yuanlin Wang,Zhenglin Li,Hüsnü Aslan,Lei Sun,Ye Sun,Wei Wang,Miao Yu
Waterborne health issues continue to grow despite the large number of available solutions. Current sterilization techniques to fight with waterborne diseases struggle to meet the demands on cost, efficiency and reach. Effective alternatives are pressingly required. Here we introduce Prussian blue coated ferroferric oxide (Fe 3 O 4 @PB) composites for water sterilization. The composites exhibit superior photothermal inactivation of bacteria under solar-light irradiation, with nearly complete inactivation of bacterial cells in only 15 min. Even for the mixed bacteria in authentic water matrices, the composites show excellent bacterial inactivation performance. Moreover, the highly magnetized iron core of the Fe 3 O 4 @PB enables magnetic separation and recycling. Multiple cycle runs reveal that Fe 3 O 4 @PB composites have exceptional stability and reusability. This work demonstrates a scalable, low-cost, high-efficiency and reusable sterilization method to improve water quality and safety.
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RSC Advances
·
2019
·Vol. 9
·期 2
·878-883
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IF 3.049
Fangke Zhan,Ran Wang,Juanjuan Yin,Zengsheng Han,Lun Zhang,Tifeng Jiao,Jingxin Zhou,Lexin Zhang,Qiuming Peng
Functional nanocomposites demonstrate excellent comprehensive properties and outstanding characteristics for numerous applications. Magnetic nanocomposites are an important type of composite materials, due to their applications in optics, medicine and catalysis. In this report, a new Fe3O4-loaded silver (Fe3O4–Ag) nanocomposite has been successfully synthesized via a simple solvothermal method and in situ growth of silver nanowires. The silver nanowires were prepared via the reduction of silver vanadate with the addition of uniformly dispersed Fe3O4 nanoparticles. Structural and morphological characterizations of the obtained Fe3O4–Ag nanocomposite were carried out using many characterization methods. As a new composite catalyst, the synthesized magnetic Fe3O4–Ag nanocomposite displayed a high utilization rate of catalytically active sites in catalytic reaction medium and showed good separation and recovery using an external magnetic field. The facile preparation and good catalytic performance of this Fe3O4–Ag nanocomposite material demonstrate its potential applications in catalytic treatment and composite materials.
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