DESALINATION
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2023
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IF 9.9
Qian Zhao,Hankang Wen,Jingyu Wu,Xiaolu Wen,Zhiyong Xu,Jiufang Duan
With the increasing scarcity of freshwater resources and electricity, solar water evaporation and photothermal power generation are effective ways to solve energy shortages by utilizing renewable sunlight. However, current solar evaporators have low mechanical strength and evaporation rate . In this study, an interpenetrating network hydrogel evaporator with high mechanical strength, high water evaporation rate and photoelectric conversion performance was developed using galactomannan (GG), polyacrylamide (PAM), graphene oxide (GO) and Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs). Among them, PAM forms a three-dimensional cross-linking network structure with crosslinking agents, while the cis hydroxyl groups on the mannose branch chain in GG form a borate ester bond cross-linking network, enhancing the mechanical properties of the system; The GO and Fe 3 O 4 NPs uniformly dispersed in the evaporator can provide significant photothermal conversion efficiency for water evaporation. Under 1 sun irradiation, the water evaporation rate reaches up to 2.3 kg m −2 h −1 and conversion efficiency is 90.7 %. In addition, the combination of the hydrogel and the thermoelectric device module achieves thermoelectric conversion with a power density of 0.46 Wm −2 . Excluding losses in practical applications, the combined equipment could in the future heat the collected water to the required temperature to cope with extreme environments.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Hanxiao Zhang,Zhengyan Wang,Dandan Wu,Yanlan Zhang,Yongzhen Wang
The production of magnetic biomass-derived carbon-based aerogels has made outstanding contributions to green chemistry and sustainable development so as to alleviate the growing electromagnetic pollution problems. In particular, carboxymethyl cellulose (CMC) possessing three-dimensional (3D) porous structure , low density and biodegradability is an effective precursor for the preparation of magnetic carbon aerogels. In this work, lightweight porous Fe 3 O 4 -Fe/carbon aerogels (FFCA) were synthesized by depositing magnetic metals on chitosan (CS)-reinforced CMC via a facile and eco-friendly strategy. The 3D porous structure and non-homogeneous conductive network endow the FFCA aerogels with comprehensive properties. Specifically, the introduction of magnetic material and the carbonization process under the temperature gradient result in tunable electromagnetic parameters and good impedance matching, allowing electromagnetic waves to enter the absorber and dissipate as much as possible. For instance, the FFCA prepared at 900 °C exhibits the impressive microwave absorption performance due to the synergistic transition between magnetic permeability and dielectric constant, with the minimum reflection loss of −45.5 dB at 2.6 mm and the effective absorption bandwidth of 3.7 GHz. This work provides an important reference for the design of eco-friendly CMC-based magneto-dielectric synergistic microwave absorption materials .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zhenliang Feng,Rongjian Wan,Shiming Chen,Xiao Tang,Hong Ju,Yan Li,Guang-Ling Song
The in-situ repair of organic anticorrosive coatings under seawater is an ideal method to extend their service life once the coatings suffer from unexpected damage. However, the attachment and solidification of the repairing organic binder on the defects under seawater are two big challenging issues, which may lead to serious delamination and bad impermeability in the repaired coatings. Inspired by the attachment of barnacle larvae, lipophilic magnetic Fe 3 O 4 nanoparticles were prepared via a co-precipitation method and then modified with oleic acid in this study. They were mixed with epoxy binder to squeeze away the seawater between the epoxy binder and substrate metals with the aid of magnetic force. The experimental results proved that the Fe 3 O 4 nanoparticles had target-driving and competitive-wetting functions, which could effectively prevent the formation of penetrating micro-channels and enhance the adhesion strength of the organic binder to substrate metals. The new method may provide a repeatable and straightforward route for the in-situ repair of organic anti-corrosion coating under seawater.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 24
·14568-14577
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IF 3.361
Chan Yu,Qian Li,Jing Tian,Honglei Zhan,Xinyu Zheng,Shujing Wang,Xitong Sun,Xiyan Sun
Polyethyleneimine-modified Fe3O4 nanoparticles (Fe3O4-PEI) were synthesized by the one-step co-precipitation method, and the resulting material was used to immobilize naringinase from the fermentation broth of Aspergillus niger FFCC uv-11. The immobilized naringinase activity could reach up to 690.74 U per g-support at the conditions of initial naringinase activity of 406.25 U mL−1, immobilization time of 4 h, glutaraldehyde concentration of 40% (w/v), immobilization temperature of 35 °C, and pH value of 5.5, with naringinase-carrying rate and naringinase activity recovery of 92.93% and 20.89%, respectively. In addition, the immobilized naringinase exhibited good pH and temperature stability in a pH range of 3.5–6.0 and temperature range of 40–70 °C, and the optimal reaction pH and reaction temperature were optimized as 5.5 and 60 °C, respectively. Besides, the immobilized naringinase could maintain 60.58% of the original activity after 10 reuse cycles, indicating that the immobilized naringinase had good reusability. Furthermore, the immobilized naringinase also performed excellent storage stability, 87.52% of enzyme activity still remained as stored at 4 °C for one month. In conclusion, the Fe3O4-PEI could be considered as a promising support for naringinase immobilization, with the advantages of high enzyme activity loading, good reusability, storage stability and rapid recovery.
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PubMed
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 11
·2100178
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IF 6.147
Limei Dong,Yiming Li,Xiuping Chen,Dan Zhang,Yihao Guan
Poor sorption capacity and low biodegradability of carbamazepine (CBZ) lead to the difficulties in CBZ removal from water. Sulfate radical-based advanced oxidation process shows great potential for organic pollutant removal. Metal organic frameworks (MOFs) demonstrate great potential in catalytic field due to their excellent properties. Hence, cobalt-based metal organic framework (ZIF-67) nanoparticles are loaded on Fe 3 O 4 -MnO 2 composite, and then this composite is applied as peroxymonosulfate (PMS) activator for CBZ degradation. The prepared catalyst exhibits excellent catalytic performance because of the central metal cobalt of ZIF-67 and the synergistic effect between MnO 2 and ZIF-67. 81% of CBZ with a high initial concentration of 20 mg L −1 is rapidly removed from water within 2.5 min. The prepared catalyst can be convenient to recycle under magnetic field while maintaining its high catalytic stability. Degradation mechanism analysis indicates that both • OH and SO 4 •− contribute to CBZ degradation, but SO 4 •− is the main radical species. XPS spectra reveal that Co(II)/Co(III), Mn(II)/Mn(III)/Mn(IV), and Fe(II)/Fe(III) are involved in PMS activation. The degradation pathway is put forward based on the detection of intermediates. This study provides a new inspiration for the fabrication of magnetic metal oxide-MOFs catalysts with outstanding recycling performance for PMS activation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Hao Ying,Tingting Chen,Chenyun Zhang,Jiahui Bi,Zhonghao Li,Jingcheng Hao
The production of ammonia through electrocatalytic nitrogen reduction reaction (NRR) is environmentally friendly and energy-saving, but it still suffers from the low NH 3 yield rate and poor selectivity. Herein, enlightened by the unique solubility of Fe 3 O 4 in deep eutectic solvent (DES), we, for the first time, reported a DES-based regeneration strategy to fabricate porous Fe 3 O 4 nanosheets utilizing commercial Fe 3 O 4 powder as raw materials. The as-regenerated porous Fe 3 O 4 nanosheets exhibited satisfactory electrocatalytic performance toward NRR, affording a NH 3 yield rate of 12.09 μg h −1 mg −1 cat along with an outstanding Faradaic efficiency (FE) of 34.38% at −0.1 V versus reversible hydrogen electrode (RHE), in the 0.1 M Na 2 SO 4 electrolyte. The superior electrocatalytic activity of the as-regenerated Fe 3 O 4 nanosheets mainly resulted from their unique sheet-like morphology with large active surface area, high porosity, and abundant oxygen vacancies. Our proposed DES-based regeneration strategy opens a new avenue for the construction of high-performance electrocatalyst from commercial raw materials, holding great promise in NRR.
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PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2020
·
IF 8.208
Yanwei Hu,Lei Shi,Zhenduo Zhang,Yurong He,Jiaqi Zhu
The addition of external force provides an alternative way to promote the application of phase change materials in thermal-energy storage, space heating, and cooling systems. However, the experimental investigation using external magnetic force to regulate the phase change process is still limited. Here, magnetic Fe 3 O 4 nanoparticles were added to paraffin wax to form phase change nanocomposites with enhanced thermal properties and controllable magnetism. The thermal properties of nanocomposites were measured and the phase change processes under magnetic controlling were experimentally and numerically investigated. A two-dimensional enthalpy-based lattice Boltzmann model with considering the external magnetic force was proposed and the measured thermal properties were used in the simulation. Good agreement between the experiment and simulation was achieved. The effects of different mass fractions of Fe 3 O 4 nanoparticles (0, 1, 2, 3 and 4 wt%), magnetic directions, magnetic field intensities (0, 20, 40, 60 mT) on the phase change characteristics are discussed. The heat transfer efficiency in a square cavity filled with the nanocomposites developed more quickly when the paraffin wax was doped with a higher Fe 3 O 4 mass fraction. Moreover, the phase change characteristics were controlled by the intensity and direction of the magnetic field. This study presents a method to achieve magnetically regulating phase change heat transfer characteristics that have potential applications in the energy-storage industry.
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高影响因子
CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Jing Liao,Huihua Huang
A smart hydrogel with pH/magnetic dual sensitivity was synthesized by in-situ synthesis of Fe 3 O 4 inside carboxymethyl chitin hydrogel matrix prepared from Hericium erinaceus residue. The structure, pH/magnetic sensitivity, swelling and drug release behavior of the prepared hydrogels were investigated. The results showed that Fe 3 O 4 nanoparticles were successfully synthesized and uniformly distributed within the hydrogels. The prepared hydrogels could be attracted by the magnet and exhibited sustained shrinkage behavior at low pH, with the desirable pH/magnetic sensitivity. The formed Fe 3 O 4 could be developed inside the hydrogels by increasing the concentrations of precursor Fe 2+ /Fe 3+ ions, and the magnetic sensitivity of hydrogels was enhanced, while the pH sensitivity and swelling degree were weakened. The Fe 3 O 4 content-dependent behavior of the prepared hydrogels suggested the adjustable properties of hydrogels. The release of 5-Fu in simulated gastric and intestinal fluids followed the Fick diffusion mechanism and showed different release rates, indicating the pH-controlled drug release behavior.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xingliang Chen,Tao Shi,Guanglei Wu,Yun Lu
The MoS 2 @polypyrrole@Fe 3 O 4 composite was skillfully synthesized via a novel one pot method. No any separation step during the synthesis process, and the Fe 2+ was successively utilized to prepare the Ppy and Fe 3 O 4 , which can achieve a high utilization of raw materials. The characterization about microstructure, crystal form, elemental composition and surface functional groups verify the structure of MoS 2 @polypyrrole@Fe 3 O 4 . Its hysteresis loop indicates that the composite performs typical soft magnetism behavior, with a magnetic saturation value of 20.3 emu.g −1 , which is helpful to improve the magnetic loss for EM wave absorbing. The reflection loss curve suggested that the composite exhibits superior EM wave absorption performance, with a minimum reflection loss value of –32 dB at the specimen thickness of just 2.0 mm due to the fair electromagnetic matching, interface polarization and interface relaxation. In addition, the one pot method used in this work can promisingly be applied to prepare other similar composites such as carbon fiber@polypyrrole@Fe 3 O 4 , graphene@polypyrrole@Fe 3 O 4 .
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高影响因子
ANALYTICAL BIOCHEMISTRY
·
2020
·
IF 2.877
Xiaodong Cao,Zihao Xia,Wuwen Yan,Shudong He,Xuan Xu,Zhaojun Wei,Yongkang Ye,Haisong Zheng
In this paper, we present a simple and label-free colorimetric biosensor for detection of the nopaline synthase (NOS) terminator in genetically modified (GM) plants. The “signal on” colorimetric biosensor was developed using a nanocomposite consisted of gold nanoparticles doped magnetic Fe 3 O 4 nanoparticles (Fe 3 O 4 @Au NP), capture probe DNA (cDNA), and hemin-functionalized reduced graphene oxide nanosheets (H-GN). The nanocomposite was successfully prepared by means of Au–S bonds and the strong π interactions between cDNA and H-GN. The sensing approach is based on the excellent peroxidase-mimicking activity of H-GN and its different electrostatic interactions with single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA). In presence of the target NOS, the cDNA in the nanocomposite will hybridize with its complementary sequence, and form dsDNA structure. Due to the weak π interactions between dsDNA and H-GN, a portion of H-GN will be released from the surface of Fe 3 O 4 @Au NPs and transferred into solution. After magnetic separation was performed, the supernatant was incubated with 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 . The released H-GN can catalyze the oxidation reaction of TMB and turn the colorless solution blue. This “signal-on” colorimetric biosensor shows a broad linear range of 0.5–100 nM for the target NOS, with a 0.19 nM detection limit. The application of the biosensor for determination of NOS segments in samples of GM and non-GM tomatoes shows that it can discriminate between GM and non-GM plants. The reliability of the method for samples of NOS-spiked GM tomato suggests satisfactory recoveries in the range of 93.6%–94.2%.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Kelin Shen,Yi Cui,Dongao Zhang,Meiying Liu,Hongye Huang,Xuefeng Sha,Fengjie Deng,Naigen Zhou,Xiaoyong Zhang,Yen Wei
In this work, we reported the preparation of MoS 2 -based Fe 3 O 4 magnetic composites (MoS 2 -Fe 3 O 4 MNPs) through the biomimetic strategy, which relied on the self-polymerization of dopamine under alkaline aqueous solution. The utilization of MoS 2 -Fe 3 O 4 MNPs as catalysts for Fenton reaction to degrade organic dyes was also examined in details. A number of experimental parameters, including concentrations of H 2 O 2 , dosages of MoS 2 -Fe 3 O 4 MNPs and pH values on the degradation efficiencies were evaluated. The mechanism for catalytic degradation of methylene blue through Fenton reaction was illustrated by electron spin resonance (ESR) measurement and results indicated that the generation of ·OH and ·O 2 − is the major reason for the degradation reaction. The results from recycle experiments suggest that catalysts possess good reusability. We demonstrated that Fe 3 O 4 MNPs would be well dispersed on the surface of MoS 2 sheets relied on the linkage by polydopamine (PDA), which prevented the aggregation of Fe 3 O 4 MNPs and thus maintained high efficiency. Furthermore, we proved that the catalysts could also have high removal efficiency under low catalyst dosage and H 2 O 2 concentration. In conclusion, we believed the MoS 2 -Fe 3 O 4 MNPs could be successfully fabricated via the biomimetic strategy and should be promising candidates for environmental treatment. The biomimetic method should be also expanded for fabrication of other functional composites owing to the universal adhesion of PDA.
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高影响因子
FERROELECTRICS
·
2020
·
IF 0.669
Qi Tang,Ting Yang,Song Wang,Hai-Lin Cong,Xin-Rui Yang,You-Qing Shen,Bing Yu
Magnetic composites have been widely used in the area of wastewater treatment, which own the properties of simple and quick adsorption and separation functions. This article presented a cost-effective and chemically modified adsorbent (Fe3O4@SiO2@Chitosan) based on a novel facile light-assisted technique for methyl orange (MO) removal. The characterization results of FT-IR, TEM, XRD and the hysteresis loop showed that Fe3O4@SiO2@Chitosan was successfully prepared. The adsorption properties of the magnetic Fe3O4@SiO2@Chitosan composite had been discussed in detail. Results show that the magnetic composite was able to remove more than 99.15% of dyes in water under optimized conditions. The Fe3O4@SiO2@Chitosan composite was stable and easily recovered, which demonstrated that the Fe3O4@SiO2@Chitosan can be successfully used as a reusable absorbent for effective removal of methyl orange from wastewater.
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高影响因子
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