Sustainability
·
2022
·Vol. 14
·期 15
·9349
·
IF 3.889
Yijia Chen,Linzhou Li,Qin Wen,Run Yang,Yiming Zhao,Xin Rao,Jihui Li,Shuying Xu,Hui Song
Magnetic modification holds a significant place for regulating the performance of biochar for wastewater treatment, endowing its magnetic separation property and facilitating its wide application. Herein, a ball-milled oxidative magnetic modification of pristine biochar was employed to manufacture magnetic biochar using K2FeO4as a precursor and internal oxidant for removal of methylene blue and tetracycline from aqueous solution. The characterizations showed that magnetic iron oxide and oxygen-containing groups were simultaneously introduced. Moreover, specific surface area and pore volume were remarkably enhanced from 0.7 m2/g to 71.2 m2/g and from 0.001 cm3/g to 0.034 cm3/g, respectively. The magnetic biochar showed that 133.76 mg/g and 58.34 mg/g adsorption capacities for MB and TC, respectively, significantly transcended the pristine biochar. Its adsorption was mainly dominated by oxygen-containing groups and iron species. This would provide an efficient oxidative magnetic modification for the preparation of oxygen-containing group-rich magnetic biochar for the removal of MB and TC.Keywords:ball-milling;oxidative magnetic modification;magnetic biochar;methylene blue;tetracycline
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Canglong Li,Xuechi Lu,Xinshuai Niu,Boyuan Zou,Yao Zhao,Xuanjie Li,Yang Lu,Yongsong Luo
The magnetic refrigeration is achieved through the magnetocaloric effect of a magnetic system, which is considered a promising technology for achieving the required low temperatures in industry, daily life, and scientific research. This work experimentally investigates the magnetic behavior and magnetocaloric performance of Ho 2 CoMn 1- x Ti x O 6 (0 ≤ x ≤ 1) double perovskites. The experimental results reveal that a paramagnetic →ferromagnetic transition characterized by a sharp increase in magnetization is suppressed due to decoupling action of Ti 4+ with 3 d 0 spin configuration. As a result, the transition temperature T C reduces monotonically from 75 K at x = 0–37 K at x = 0.6, and no obvious ferromagnetic transition is identified at x = 0.8–1 due to the lack of Co 2+ –Mn 4+ interactions at so high Ti 4+ substitution concentration. In addition, the magnetocaloric effect is investigated by measuring the isothermal initial magnetization from 4 K to a temperature far above T C . The maximum magnetic entropy ( − Δ S M max ) under Δ H = 6 T does not exhibit significant variation from x = 0 (11.1 J kg −1 K −1 ) to 0.6 (11.5 J kg −1 K −1 ), while it increases noticeably from x = 0.8 (13.9 J kg −1 K −1 ) to 1 (17.2 J kg −1 K −1 ). The present work indicates that the cryogenic magnetocaloric effect can be improved by dilution effect of nonmagnetic ions.
研究领域:
材料科学
·
凝聚态物理
·
应用物理
·
磁性材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2014
·
IF 0
Lili Yan,Long Kong,Zan Qu,Liang Li,Guoqing Shen
Magnetic biochar/ZnS composites were successfully synthesized by deposition of ZnS nanocrystals (NCs) on magnetic biochar in a polyol solution. The as-prepared composites showed a high maximum adsorption capacity for Pb (II) up to 367.65 mg g–1, which was 10 times higher than that of reported magnetic biochar. Furthermore, the lead-laden magnetic biochar/ZnS composites can be easily separated from the solution by a magnet after adsorption because of the excellent superparamagnetic properties. The composites were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The adsorption process was well described by the pseudo-first-order model, and the adsorption isotherm could be well fitted by the Langmuir model. The thermodynamic studies showed that the removal of Pb (II) was an endothermic and spontaneous process. The present results warrant the promising application of magnetic biochar/ZnS composites in removal of Pb (II) from contaminated water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
ACS Applied Nano Materials
·
2021
·
IF 5.097
Wenyan Meng,Yiyun Gao,Zhenfen Tian,Weijie Xu,Jiagao Cheng,Shengke Li,Aihua Zou
A magnetic metal–organic framework nanocomposite as a collectable pesticide delivery vehicle was developed through the incorporation of UiO-66 with polydopamine-coated Fe3O4 (Fe3O4@PDA@UiO-66). The obtained Fe3O4@PDA@UiO-66 nanocomposite was verified by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and zeta potential test. The magnetic collectability of Fe3O4@PDA@UiO-66 was demonstrated through a magnetic hysteresis loop study (∼2 emu/g) and magnetic collection experiment (up to a 96% collection rate). Imidacloprid (IMI) was employed as a model pesticide to be loaded into the Fe3O4@PDA@UiO-66 nanocomposite, with 15.87% drug loading. IMI was found to exhibit sustained-release behavior after being loaded into the delivery vehicle, and magnetic Fe3O4@PDA@UiO-66 can be readily collected after IMI release, which is beneficial to constrain the hazardous effects of the vehicles and the residual pesticide on the ecosystem. The insecticidal activity of IMI@Fe3O4@PDA@UiO-66 toward Aphis craccivora Koch was found to be superior to that of free IMI, and the efficacy was comparable to that of the commercial 70% IMI water dispersible granule, indicating its potential as a magnetic collectable green carrier for pesticides in agriculture.
研究领域:
材料科学
·
农业科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 23
·12656-12668
·
IF 14.511
Dingzhong Yuan,Jizhou Zhao,Qinghua Zhang,Peng Lu,Yun Wang,Yan He,Zhirong Liu,Yan Liu,Xiaohong Zhao,Cheng Meng
Recovery of uranium from aqueous solutions using core–shell superparamagnetic polymer nanomaterials as efficient adsorbents might be helpful for environmental protection, due to their excellent structural stability, high concentration of accessible organic ligands and superparamagnetic character. Herein, a novel imidazole functionalized core–shell sunflower-like magnetic polymer adsorbent Fe3O4/P (MBA-VIM) was synthesized by one step distillation-precipitation polymerization of N,N′-methylene bis(2-propenamide) (MBA) and vinyl imidazole (VIM). The magnetic Fe3O4 core facilitated easy separation by using magnetic force. The polymer shell with a sunflower-like structure provided relatively large specific surface area and abundant active adsorption sites, and the high concentration of imidazole groups could function as a claw for catching uranium. The maximum adsorption capacity of 800.0 mg g−1 on Fe3O4/P (MBA-VIM) could be attained at pH 4.5, and adsorption equilibrium could be achieved even within 180 seconds, which was far superior to that of most of the adsorbents reported previously. Besides, Fe3O4/P (MBA-VIM) also showed an excellent uranium selectivity of 84.2% in the presence of multiple ions, and could be isolated by using magnetic force facilely and be recycled for at least six cycles without an obvious decrease of adsorption capacity. More importantly, Fe3O4/P (MBA-VIM) had an excellent structural stability, and the morphology and chemical structure of the adsorbent did not change even after six cycles. Both XPS and DFT analysis confirmed that only the N atom in CN of imidazole took part in uranium coordination. The DFT result showed the optimized geometric structure of 1 : 2 of UO22+ with the two imidazole groups of the two distinct polymer chains which could describe the interaction of uranium with Fe3O4/P (MBA-VIM). Thus, this work provides a convenient strategy to develop core–shell magnetic adsorbents for efficient extraction of uranium from aqueous solutions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2024
·Vol. 11
·期 2
·2400265
·
IF 5.3
Jiaao Yu,Hui Luo,Sihai Lv,Zhihui Wang,Fu Chen,Yongzhi Cheng,Xiangcheng Li
The development of novel materials with high-efficiency microwave absorption is crucial for mitigating the adverse impacts of electromagnetic pollution. In this study, MXene and FeNi Prussian blue analogs (PBA) are assembled onto a melamine foam using self-assembly and in situ growth technique. Subsequently, magnetic carbon foam, comprising FeNi alloys, TiN and carbon with various morphologies, is synthesized via carbothermal reduction reaction. The surface morphology electromagnetic properties are significantly influenced by the pyrolysis temperature. The results revealed that the magnetic carbon foam composite demonstrated an effective microwave absorption bandwidth of 4.72 GHz at a thickness of only 1.5 mm, with a minimum reflection loss of −24.83 dB at 1.3 mm. The outstanding microwave absorption performance can be attributed to the 3D conductive network formed by N-doped carbon, as well as the contributions from polarization loss, magnetic loss, and suitable impedance matching. Furthermore, the corresponding absorber coating demonstrated a maximum reduction value of radar cross-section (RCS) by 13.16 dB m 2 . This research offers novel insights for the development of lightweight and efficient low-filled electromagnetic composite for broadband microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2017
·Vol. 63
·期 9
·4115-4123
·
IF 2.836
Peng Guo,Changfeng Zeng,Chongqing Wang,Lixiong Zhang
Surfactant-free magnetic ionic liquid (MIL)-water Janus microdroplets with adjustable structures and morphologies are prepared in capillary-based microfluidic devices. Their morphologies (e.g., sizes, curvatures of the interfaces, and structures from Janus to core/shell) can be adjusted in a wide range by changing the flow rate ratio of water to MIL, adding different mass fractions of polyethylene glycol in water, and using soybean oil rather than liquid paraffin as the continuous phase. MIL-water-MIL ternary Janus magnetic microdroplets with adjustable symmetric and asymmetric structures are also prepared. These Janus microdroplets can be manipulated by magnetic attraction, leading to easy formation of water-MIL-water, MIL-water-oil, necklace-structured MIL-water alternative Janus droplets as well as more complex Janus droplets, such as MIL-CO 2 -in-water and MIL-water-water droplets. Such preparation strategy is simple and can be applied in fields like pharmaceuticals, multi-drug chemotherapies, and catalysis with expensive materials. © 2017 American Institute of Chemical Engineers AIChE J , 63: 4115–4123, 2017
研究领域:
材料科学
·
化学工程
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5573
·
IF 4.6
Ling-Xiao Chen,Shi-Jun Yin,Tong-Qing Chai,Jia-Li Wang,Guo-Ying Chen,Xi Zhou,Feng-Qing Yang
A core–shell-derived structural magnetic zeolite imidazolate framework-67 (Fe3O4[email protected]) nanocomposite was fabricated through a single-step coating of zeolite imidazolate framework-67 on glutaric anhydride-functionalized Fe3O4nanosphere for the magnetic solid-phase extraction (MSPE) of theophylline (TP). The Fe3O4[email protected]nanocomposite was characterized through scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectrometry, Fourier transform infrared spectroscopy, Zeta potential analysis, X-ray diffraction, Brunauer–Emmett–Teller, and vibrating sample magnetometer. The material has a high specific surface area and good magnetism, which maintains the regular dodecahedron structure of ZIF-67 without being destroyed by the addition of Fe3O4-COOH nanospheres. The Fe3O4[email protected]can rapidly adsorb TP mainly through the strong coordination interaction between undercoordinated Co2+on ZIF-67 and –NH from imidazole of TP. The adsorption and desorption conditions, such as the amount of adsorbent, adsorption time, pH value, and elution solvent, were optimized. The kinetics of TP adsorption on Fe3O4[email protected]was found to follow pseudo-second-order kinetics. The Langmuir model fits the adsorption data well and the maximum adsorption capacity is 1764 mg/g. Finally, the developed MSPE-HPLC method was applied in the enrichment and analysis of TP in four tea samples and rabbit plasma. TP was not detected in oolong tea and rabbit plasma, and its contents in jasmine tea, black tea, and green tea are 5.80, 4.31, and 1.53 μg/g, respectively. The recoveries of spiked samples are between 74.41% and 86.07% with RSD in the range of 0.81–3.83%. The adsorption performance of Fe3O4[email protected]nanocomposite was nearly unchanged after being stored at room temperature for at least 80 days and two consecutive adsorption–desorption cycles. The results demonstrate that Fe3O4[email protected]nanocomposite is a promising magnetic adsorbent for the preconcentration of TP in complex samples.Keywords:magnetic zeolite imidazolate framework;core–shell-derived structure;theophylline;magnetic solid-phase extraction;tea
研究领域:
材料科学
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分析化学
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 18
·6879-6887
·
IF 5.731
Fei Pang,Mingyuan He,Jianping Ge
Graphical Increasing attraction : Fe 3 O 4 /zeolite imidazolate framework (ZIF-8) nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate (MeIM) and zinc nitrate in the presence of Fe 3 O 4 nanocrystals (see figure; PAA=polyacrylic acid). The particles have a superparamagnetic response and can be separated by means of a magnetic field and redispersed into the solution after withdrawal of the field. Fe 3 O 4 /ZIF-8 nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate and zinc nitrate in the presence of Fe 3 O 4 nanocrystals. The particle size, surface charge, and magnetic loading can be conveniently controlled by the dosage of Zn(NO 3 ) 2 and Fe 3 O 4 nanocrystals. The as-prepared particles show both good thermal stability (stable to 550 °C) and large surface area (1174 m 2 g −1 ). The nanoparticles also have a superparamagnetic response, so that they can strongly respond to an external field during magnetic separation and disperse back into the solution after withdrawal of the magnetic field. For the Knoevenagel reaction, which is catalyzed by alkaline active sites on external surface of catalyst, small Fe 3 O 4 /ZIF-8 nanoparticles show a higher catalytic activity. At the same time, the nanocatalysts can be continuously used in multiple catalytic reactions through magnetic separation, activation, and redispersion with little loss of activity.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Xu Ni,Jingjing Zhang,Linjie Zhao,Fangqi Wang,Hua He,Pierre Dramou
Magnetic iron oxide nanoparticles (MIONPs) possess the unique advantages of both magnetic features and nanomaterials . Using ferric trichloride hexahydrate and sodium acetate as crude materials, polyethylene glycol 1000 (PEG1000) as the surfactant , and ethylene glycol as the dispersion medium, Fe 3 O 4 nanoparticles were prepared by solvothermal method. Furthermore, through scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), vibrating sample magnetometer (VSM),X-ray diffractometer (XRD), synchronous thermal analyzer (TGA), Fourier transform infrared spectrometer (FT-IR), Zeta potentiometer, the structure, morphology and phase composition of MIONPs were characterized. Results evidenced that the particle size of MIONPs was inversely proportional to the specific surface area, and gradually increased until 8 h ( ca. 200–300 nm) when superparamagnetic iron oxide nanoparticles (SIONPs) clusters were obtained. This research has demonstrated a new way of viewing this synthesis procedure upon variation of time and subsequent features of clusters.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
MARINE POLLUTION BULLETIN
·
2017
·
IF 3.146
Botao Song,Jie Zhu,Haiming Fan
Oil spill accident and oily water have potential risks to environment and human health, thus need to be imperatively treated. Herein, a magnetic fibrous sorbent was designed via electrospinning of suspension containing polymer and magnetic nanoparticles in one step for remote and efficient oil adsorption. The morphology of the magnetic fibrous sorbent was characterized by scanning electron microscopy . The magnetic property and the wetting behavior were measured by vibrating sample magnetometer and contact angle system, respectively. The results showed that the morphology of the fibers was homogeneous and the magnetic nanoparticles were well dispersed within the fibers. It was also found that this composite sorbent had good magnetic response, special wettability , and remote oil adsorption capacity. We believed this novel polymer/Fe 3 O 4 fibrous sorbent could be used as a promising material for the remote oil/water separation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 6
·1111
·
IF 5.3
Wen-Xin Liu,Wei-Na Zhou,Shuang Song,Yong-Gang Zhao,Yin Lu
A new type of magnetic nanomaterial with Fe3O4as the core and organic polymer as the shell was synthesized by seed emulsion polymerization. This material not only overcomes the problem of insufficient mechanical strength of the organic polymer, it also solves the problem that Fe3O4is prone to oxidation and agglomeration. In order to make the particle size of Fe3O4meet the requirement of the seed, the solvothermal method was used to prepare Fe3O4. The effects of the reaction time, amount of solvent, pH value, and polyethylene glycol (PEG) on the particle size of Fe3O4were investigated. In addition, in order to accelerate the reaction rate, the feasibility of preparing Fe3O4by microwave was studied. The results showed that under the optimum conditions, the particle size of Fe3O4could reach 400 nm and had good magnetic properties. After three stages of oleic acid coating, seed emulsion polymerization, and C18 modification, the obtained C18-functionalized magnetic nanomaterials were used for the preparation of the chromatographic column. Under optimal conditions, stepwise elution significantly shortened the elution time of sulfamethyldiazine, sulfamethazine, sulfamethoxypyridazine, and sulfamethoxazole while still achieving a baseline separation.Keywords:solvothermal method;chromatographic packing materials;magnetic Fe3O4particles;C18-functionalized magnetic nanomaterials
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）