Nanoscale
·
2022
·Vol. 14
·期 45
·16787-16796
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IF 8.307
Yan Li,Hongrui Zhu,Junbo Duan,Youshen Wu,Daocheng Wu
Reticular 2-bromo-2-methylpropionic acid (BMPA) modified Fe3O4 nanoparticle aggregates with novel acoustic properties, namely the photoexcited audible sound (PEAS) effect, were prepared by a laser-induced irradiation method. Their morphology was observed by Lorentz transmission electron microscopy. Their chemical structure, crystal composition, and magnetic properties were analyzed using infrared spectroscopy, X-ray diffraction, and a magnetic property measurement instrument, respectively. It is found that the nanoparticle aggregates appeared reticular, with the size of the BMPA modified Fe3O4 nanoparticles being 5.5 ± 0.4 nm. The saturation magnetization values of the BMPA modified Fe3O4 nanoparticles and associated aggregates were 59.99 and 63.51 emu g−1, respectively. The reticular BMPA modified nanoparticle aggregates can produce strong PEAS signals under very weak laser irradiation with great stability and repeatability. The emitted PEAS signals possessed strong specificity, suitable decay time and a large amount of information under a very weak laser power and can be detected by the human ear without any special detection equipment. Subsequently, a heat transfer model was constructed for the simulation of the possible mechanism of the PEAS effect using COMSOL software. The simulation results showed that the aggregates have a fast heat transfer rate with the temperature increasing to 480 K in only 0.25 s and 600 K in 5 s, respectively, meeting the requirements of the vapor explosion mechanism. Therefore, we realized that the possible mechanism of the PEAS effect of the reticular BMPA modified Fe3O4 nanoparticle aggregates is laser-induced fast heat transfer and vapor explosion in situ, resulting in the observed audible sound phenomenon. This novel PEAS effect has potential for application in materials science, biomedical engineering and other fields.
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Kang-Ping Cui,Ting-Ting Yang,Yi-Han Chen,Rohan Weerasooriya,Guang-Hong Li,Kai Zhou,Xing Chen
Antibiotic pollution of water resources is a global problem, and the development of new treatments for destroying antibiotics in water is a priority research. We successfully manufactured recyclable magnetic Fe3O4/g-C3N4 through the electrostatic self-assembly method. Selecting tetracycline (TC) as the target pollutant, using Fe3O4/g-C3N4 and H2O2 developed a heterogeneous optical Fenton system to remove TC under visible light. Fe3O4/g-C3N4 was systematically characterized by SEM, TEM, XRD, FTIR, XPS, DRS, and electrochemical methods. The removal efficiency of 7% Fe3O4/g-C3N4 at pH = 3, H2O2 = 5 mM, and catalyst dosage of 1.0 g/L can reach 99.8%. After magnetic separation, the Fe3O4/g-C3N4 photocatalyst can be recycled five times with minimal efficiency loss. The excellent degradation performance of the prepared catalyst may be attributed to the proper coupling interface between Fe3O4 and g-C3N4 which promotes the separation and transfer of photogenerated electrons. Photogenerated electrons can also accelerate the conversion of Fe3+ to Fe2+, thereby producing more ˙OH. The new Fe3O4/g-C3N4 can be used as a raw material for advanced oxidation of water contaminated by refractory antibiotics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhengwen Wei,Yifan Du,Xiang-fei Lü,Wei Wang,Roberta Del Sole,Giuseppe Mele,Zhen-Yi Jiang
Ascribing to the serious environmental and health risks caused by phenanthrene (PENE) and its dangerous degradation intermediate, 9-phenanthrol (9-PENE), solving their contamination problem was extremely urgent. In this work, a novel Fe 3 O 4 -terephthalaldehyde (Fe 3 O 4 -TERE) magnetic nanomaterial was fabricated by introducing aromatic rings onto Fe 3 O 4 nanoparticles through encapsulation and grafting technique. The Fe 3 O 4 core provided convenience for the subsequent recycling and regeneration. The grafted aromatic carbons could act as adsorption active sites to form π–π interaction with PENE/9-PENE’s aromatic rings, thus improving the capture performance. The properties of the prepared magnetic nanomaterials were investigated via multiple characterization techniques. As expected, the Fe 3 O 4 -TERE could be utilized for effectively reducing the contamination risk of PENE and 9-PENE. Furthermore, the Fe 3 O 4 -TERE possessed with excellent regeneration performance. The abundant homogeneous reaction sites of Fe 3 O 4 -TERE provided possibility for the monolayer adsorption of PENE and 9-PENE. There were multiple microscopic interactions and driving forces jointly or individually participated the multi-stage adsorption reaction. Moreover, density functional theory calculations not only analyzed the validity and existence form of the π–π interaction under different adsorption configuration modes, but also provided deeply perspectives related to the microscopic bonding mechanism. This work proposed a promising fabrication strategy for magnetic nanomaterials used for removing and remediation of polycyclic aromatic hydrocarbons contamination, as well as provided profound theoretical perspectives for analyzing the adsorption mechanism.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Haiyang Li,Lanlan Lin,Rui Yan,Zekun Chen,Xinyu Wen,Xianwu Zeng,Caihong Tao
Combination therapy has become an effective strategy for tumor treatment, but the preparation of drug nanocarriers with the high requirements still lacked exploration. In this paper, hollow shell-layer mesoporous polydopamine (HMPDA) was constructed on Fe 3 O 4 nanoparticles (the magnetic core), and small-sized G5-Au nanoparticles (AuNPs) as the releasable satellite carriers for tumor deep treatment were modified on HMPDA surface, then the nucleus-satellite Fe 3 O 4 @HMPDA@G5-Au nano drug delivery carriers were obtained. The therapy drug could be loaded in the mesoporous structure of HMPDA and G5-Au nanoparticles, so the drug loading capacity was relatively large. The Fe 3 O 4 @HMPDA@G5-Au composite nano carriers also had good photothermal properties, because polydopamine (PDA) and AuNPs were both good photothermal agents. Combination of photothermal therapy (PTT) and drug therapy could significantly enhance the ablation of tumor cells with minor side effects. In addition, the decomposition of H 2 O 2 in the tumor site catalyzed by the AuNPs could also produce oxygen to alleviate tumor hypoxia. In addition, because of the magnetic properties of Fe 3 O 4 nanoparticles, the Fe 3 O 4 @HMPDA@G5-Au nano drug delivery carriers also had magnetic targeting performance and could reach the specified position under the guidance of external magnetic field. The results showed that the average DOX loaded amount of the prepared carriers was 473.83 mg/g, the drug release rate in 24 h could achieve 61.3 %. The cytotoxicity test showed that the drug loaded carriers had a significant inhibitory effect on HepG2 cells. The drug-loaded core-satellite nanocarriers could play a good synergistic treatment effect on cancer under the multi effect synergy of PPT, drug therapy, magnetic targeting and pH-responsive drug release.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Bo Jiang,Jinzhe Li,Xinyi Chen,Lu Huang,Shan Luo,Ying Xing,Jing Deng,Shuang Song,Feilong Dong
Exploring an environmentally friendly and highly activation catalysts in the advanced oxidation processes (AOPs) basing on sulfate radicals (SO 4 − •) has shown great importance for the remediation of refractory contaminants. Herein, Fe 3 O 4 -wrapped ZSM-5 (Fe 3 O 4 @ZSM-5) was constructed as heterogeneous catalyst to remove ciprofloxacin (CIP) via peroxymonosulfate (PMS) activation, in which performance, kinetics and mechanism insight were investigated in depth. The removal efficiency of CIP reached 90 % by Fe 3 O 4 @ZSM-5 catalysts within 100 min reaction when the initial pH was 3.0. During the reaction, SO 4 − • and HO• were proved to be coexisted in reaction system and SO 4 − • played a critical role in CIP degradation according to the radical quenching experiments and electron paramagnetic resonance (EPR) measurements. Based on the catalyst characterization and Langmuir-Hinshelwood adsorption kinetics analysis, the synthesis of Fe 3 O 4 nanoparticles (NPs) and ZSM-5 accelerated the dispersion process and enhanced adsorption ability of Fe 3 O 4 NPs, which further promoted the local concentration of CIP and PMS on the surface. In addition, the cycling experiments and metal leaching tests demonstrated that Fe 3 O 4 @ZSM-5 catalysts were stable and could be conveniently reused by magnetic separation. In addition, the impacts of coexisting irons (Cl − , SO 4 2− , NO 3 − , HCO 3 − ) confirmed that Fe 3 O 4 @ZSM-5 was still effective in real water. This study demonstrated the promising prospect of Fe 3 O 4 @ZSM-5/PMS system in the application of degradation refractory organic pollutants .
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CHEMOSPHERE
·
2022
·
IF 8.943
Ning Hou,Xin Zhao,Ziyi Han,Xinxin Jiang,Yongping Fang,Yun Chen,Dapeng Li
The inability to demulsify oil-in-water emulsions via green and efficient processes is a challenging problem in many industrial processes. As a novel biodemulsifier, protein demulsifiers display excellent dispersibility and stability, but their demulsification mechanisms are not clear, which severely restricts their large-scale production and application. In this study, the demulsification mechanism of the high-efficiency protein biodemulsifier oxalate decarboxylase (Bacm OxdC), which is secreted by the Bacillus mojavensis XH1 strain, for an oil-in-water emulsion was analyzed. The results showed that Bacm OxdC was spontaneously adsorbed at the oil-water interface and turned its hydrophobic amino acids outward to increase its hydrophobicity and break the emulsified system. Furthermore, it effectively reduced the oil-water interfacial tension and interfacial film strength, thereby reducing the oil-water interfacial energy and finally enabling demulsification. To further improve the demulsification efficiency and reusability, Fe 3 O 4 @SiO 2 @OxdC-DDSA was prepared. This method provided a magnetic response for Bacm OxdC and enabled efficient demulsification. The demulsification rate of Fe 3 O 4 @SiO 2 @OxdC-DDSA reached 98.1% at 24 h, which was 30.7% higher than that of the original Bacm OxdC. After three cycles, the demulsification rate still reached 89.3%, proving it has excellent recyclability . This work is the first study on the demulsification mechanism of protein biodemulsifiers and provides useful insights into the demulsification mechanism of biodemulsifiers for oil-in-water emulsions. In addition, a promising high-efficiency modification technique for protein biodemulsifiers was proposed, which provided information for the development of biodemulsifiers for oil-water separation.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Kai Feng,Jiang Gong,Jinping Qu,Ran Niu
Micro/nanomotors have emerged as a vibrant research topic in biomedical and environmental fields due to their attractive self-propulsion as well as small-scale functionalities. However, single actuated micro/nanomotors are not adaptive in facing intricate natural and industrial environments. Herein, we propose a new dual-mode-driven micromotor based on foam-like carbon nitride (f-C3N4) with precipitated Fe3O4 nanoparticles, namely, Fe3O4/f-C3N4, powered by chemical/magnetic stimuli for rapid reduction of organic pollutants. The Fe3O4/f-C3N4 motor composed of a three-dimensional (3D) porous “foam-like” structure and precipitated Fe3O4 nanoparticles (ca. 50 nm) not only exhibits efficient photocatalytic performance under visible light but also shows versatile and programmable motion behavior under the control of external magnetic fields. The aggregation of the micromotor under an external rotating magnetic field further enhances the catalytic activity by the increased local catalyst concentration. Furthermore, the magnetic property endows the micromotor with easy recyclability. This study provides a novel dual-mode-driven micromotor for antibiotics removal with magnetic field and light-enhanced performance in industrial wastewater treatment at a low cost.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tong Ding,Wenxiao Zhao,Yuqing Sun,Shilong Li,Tianxiang Yu,Wenheng Jing
In this work, a novel 2D Fe 3 O 4 -MnO 2 hollow fiber ceramic membrane (HFCM) with both excellent separation performance and high catalytic activity was constructed. The Fe 3 O 4 nanoparticles were deposited on 2D MnO 2 nanoplates to increase the Mn 3+ content, and then the nanoplates were pressure-driven and sintered on the surface of the hollow fiber ceramic supports to obtain 2D Fe 3 O 4 -MnO 2 -HFCMs. Electron spin resonance analysis confirmed that hydroxyl radicals and superoxide radicals played a major role in oxidative degradation and tetracycline hydrochloride (TCH) removal was 86.9 %. Noteworthily, TCH was concentrated on the membrane interface due to the concentration polarization effect, which increases the probability of binding free radicals from the catalytic membrane layer, thus enhancing the catalytic performance and the anti-fouling capability of the membrane. The 2D Fe 3 O 4 -MnO 2 -HFCM can be applied in wastewater treatment due to its superior catalytic ozonation activity and high separation performance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wenbin Gao,Yan Tan,Binhai Wu,Yuzhen Chen,Zhan Hu,Yifan Wang,Yujiao Wen,Zhi Zhou,Nan Zhou
Quinclorac (QNC) and Cr(VI), are common contaminants in surface waters, posing serious hazard to human and ecological health. Nano FeS, an effective catalyst that has excellent redox properties, is susceptible to over-oxidation and agglomeration problems, which impede its practical application. Herein, nano-Fe 1−x S was modified by stable iron oxide (Fe 3 O 4 ) and biochar (BC AA /Fe 1−x S/Fe 3 O 4 ), which presented the core (Fe 1−x S) shell (Fe 3 O 4 )-like structure uniformly dispersed on BC AA surface. The composite overcame the disadvantages of nano-Fe 1−x S and achieved high removal efficiency of 100% and 99.98% for QNC and Cr(VI), respectively. Based on XPS analysis, Fe(II) content was reduced from 53.3% to 34.2% and S(II) content from 13.0% to 6.5%. Fe(II) species in the composite were the main active substance for QNC degradation and Cr(VI) reduction, and S(II) species also indirectly provided electrons to promote Fe 2+ /Fe 3+ cycling. Then, we identified the intermediates of QNC and active radicals • OH or SO 4 •− in the system to suggest possible degradation pathways. We further discovered no mutual interference between QNC and Cr(VI) and proposed the possible mechanism for simultaneous removal that QNC degradation by radical attack and Cr(VI) reduction by electrons.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jie Chen,Jiafeng Wan,Chi Li,Yuhan Wei,Haolin Shi
Fe 0 -Fe 3 O 4 nanoparticles and cerium dioxide hollow spheres as efficient heterogeneous electro-Fenton reagents were rationally designed to be embedded in porous carbon derived from skimmed cotton for the electrocatalytic degradation of ceftriaxone sodium. Skimmed cotton porous carbon material has a hollow tubular structure, and cerium dioxide is dispersed on the surface of the carbon material in a hollow sphere structure of uniform size. Fe 0 -Fe 3 O 4 nanoparticles were wrapped in irregular particle shapes on the surface of cerium dioxide hollow spheres, and the remaining part was laid flat on the surface of porous carbon material. The as-synthesized Fe 0 -Fe 3 O 4 /CeO 2 /C showed excellent degradation efficiency of 95.59 % for ceftriaxone sodium within 120 mins and obtained a COD removal rate of 95.21 % at 240 mins. The zero-valent iron as a reducing agent effectively accelerated the Fe 3+ /Fe 2+ cycle, allowing the composites to exhibit higher catalytic activity and further reducing the possibility of secondary contamination. Moreover, the existence of cerium dioxide further promoted the redox cycle of Ce 4+ /Ce 3+ and accelerated the electron transfer in the interface of the catalyst. The synergistic effect of iron and cerium greatly facilitated the production of hydroxyl radicals and increased the yield of hydroxyl radicals in the reaction system.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 32
·e52746
·
IF 3.057
Chaoyu Wang,Zhi Hao,Zhu Luo,Le Yang,Qin Zhou,Jiaxing Guo
Efficient heat dissipation is very crucial for the performance, service life, and reliability of modern electronic devices. It is very challenging to improve heat dissipation efficiency through innovative material structure design. Therefore, in the work, dopamine (PDA) is used to coat the surface of graphite (C) with its excellent surface coating modification ability, so that the C surface has oxygen-containing groups to change its electronegativity, and Fe 2+ and Fe 3+ in the solution are attracted to the surface of C, and then in situ redox reaction occurs on the surface of C to generate magnetic graphite (Fe 3 O 4 @C). Fe 3 O 4 @C is uniformly dispersed into liquid silicone rubber (LSR) by solution blending, and Fe 3 O 4 @C performs integral directional filling in the LSR under the action of magnetic field ( B = 140 mT), thus preparing Fe 3 O 4 @C/LSR composites. Through magnetic field orientation, the thermal conductivity of Fe 3 O 4 @C/LSR composites reach 1.25 W/m·K when the content of Fe 3 O 4 @C is 100 phr, which is 410% higher than that of pure LSR (0.2447 W/m·K). Infrared thermal imaging test shows that Fe 3 O 4 @C/LSR composites has good heat dissipation performance, Fe 3 O 4 @C/LSR composites have shown great potential in terms of flexibility and high thermal conductivity.
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Environmental Science-Nano
·
2022
·Vol. 9
·期 9
·3562-3580
·
IF 9.473
Zhengwen Wei,Xiang-fei Lü,Wei Wang,Giuseppe Mele,Zhen-Yi Jiang
Owing to the more significant health and environmental risks of 9-phenanthrol (9-PROL) compared to phenanthrene, it is imminent to solve the 9-PROL pollution issue. Herein, Fe3O4-0.75-4,4′-biphenyldicarboxaldehyde (Fe3O4-0.75BIPHENY) was synthesized via a silane coupling reaction and condensation reaction and employed as an efficient nanocomposite for the removal of 9-PROL. The magnetic core provided the possibility for its fast and convenient separation and the aromatic rings on the BIPHENY shell contributed to improving the capturing ability of 9-PROL molecules via the formation of π–π interactions. Multiple characterization techniques were employed to obtain a comprehensive understanding of the prepared magnetic adsorbents. Fe3O4-0.75BIPHENY not only exhibited an excellent adsorption performance towards 9-PROL, but also showed a relatively excellent regeneration performance. The homogeneous surface of Fe3O4-0.75BIPHENY provided adsorption sites for the adsorption of 9-PROL molecules, which adhered in monolayer molecular form. Importantly, density functional theory calculations provided novel deep insights into the most possible adsorption bonding mode and verified that π–π interactions existed in the offset stacking form. Furthermore, the visible electrostatic potential and energy orbital distribution plots demonstrated the validity of the adsorption reaction and stability of a specific configuration. This study provides guidance for the assembly of novel magnetic nanocomposites for alleviating traditional and secondary pollution caused by polycyclic aromatic hydrocarbons.
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