CHEMOSPHERE
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2023
·
IF 8.8
Zhenzhen Liu,Huiyu Zhao,Jiao Wang,Zhiwei Wang,Shanshan Di,Hao Xu,Qiang Wang,Xinquan Wang,Peipei Qi
A biosafe magnetic Fe 3 O 4 @SiO 2 @Salg (GMS) was successfully developed via a simple and economic method. Fe 3 O 4 @SiO 2 particles were selected as the magnetic core, and they directly interacted with sodium alginate, thus mitigating the use of cross-linking agents. The microstructure, properties, and formation mechanism of GMS were examined using FE-SEM, TEM, VSM, TGA , zeta potential , and FT-IR. The as-developed GMS was used as a desirable adsorbent to remove organophosphorus pesticides (OPPs) from water bodies, and the influence of different factors on the removal efficiencies of OPPs was investigated. Optimal preparation conditions were determined, and the excellent removal efficiencies of the 18 OPPs were achieved in this study (80.5%–100% for tap, river, and seawater). After the GMS was recycled eight times, the removal efficiencies of 18 OPPs were maintained at >80%. Adsorption kinetics and isotherm models showed that the adsorption process was accurately fitted with the Langmuir isotherm and pseudo-second-order models. The values of ΔG , ΔH , and ΔS were negative, indicating that the OPPs were adsorbed on the GMS spontaneously via an exothermal reaction, and chemisorption was the dominant adsorption mechanism. Overall, the as-developed GMS was biosafe as revealed by cytotoxicity experiments. GMS had good environmental security, stability, and reusability, and it exhibited excellent potential for removing OPPs from aqueous solutions without causing secondary pollution.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jun Liu,Hui Wang,Wen-Yao Zhu,Heng-Xue Xie,Xin Li,Wen-Juan Li,Ge Bai,Meng-Jie Chang,Xiao-Jiao Chai,Hui-Ling Du,Shi-Jie Song
We present a novel method to facilely prepare magnetically recoverable AgCl/Fe 3 O 4 @MIL-100(Fe) (ACFM) nanostructures for photocatalytic degradation of rhodamine B (RhB). The ACFM was directly prepared via a simple successive ionic layer adsorption and reaction (SILAR) deposition of MIL-100(Fe) on solvothermal synthesized Ag/Fe 3 O 4 nanoparticles , in which process Ag was completely oxidized into AgCl concurrent with the formation of MIL-100(Fe). The ACFM prepared with 15 SILAR cycles exhibits 92.9% efficiency towards photodegrading RhB within 30 min under visible light illumination, which is higher than that of the individual structure of AgCl/Fe 3 O 4 , Ag/Fe 3 O 4 @MIL-100(Fe) or Fe 3 O 4 @MIL-100(Fe). The remarkably enhanced photocatalytic performance is attributed to the abundant active sites and sufficient visible light response of MIL-100(Fe), as well as effective charge separation at the heterojunction interface between AgCl and MIL-100(Fe). Furthermore, the obtained ACFM can be quickly separated from the pollutant solution with a magnet and possesses good stability for recycling photocatalysis . In light of the study, the ACFM nanostructures are believed to be applied as promising photocatalysts for practical applications.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 5
·1-10
·
IF 5.7
Ni Yun,Chen Xiu,Ling Chen,Zhu Ziye,Yue Yao,Wang Jie,He Aolin,Liu Ruijiang
The CYP2C19*2 gene carriers and non-carriers are closely related to the dosage of clopidogrel. To correctly guide the use of clopidogrel and promote individualized therapy, an ultra-sensitive electrochemical biosensor was developed for the detection of CYP2C19*2 gene. The heterogeneous α-Fe 2 O 3 /Fe 3 O 4 nanosheets were prepared via the hydrothermal-calcination process, and the preparation parameters were optimized. The average diameter and thickness of the nanosheets were approximately 150 nm and 53 nm, respectively; and the saturation magnetization was 80.2 emu/g. The α-Fe 2 O 3 /Fe 3 O 4 @Au nanosheets were prepared by sodium borohydride reduction method, and self-assembled to the electrode surface with magnetic field. Ultra-sensitive detection of CYP2C19*2 gene was realized through the recognition ability of strong single base mismatching of peptide nucleic acid and signal amplification effect of magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanosheets. Under optimal detection conditions, the current had a good linear correlation with the negative logarithm of CYP2C19*2 gene concentration in the range 1 pM—1 nM, and the detection limit was 0.64 pM (S/N = 3). Meanwhile, the electrochemical signals of target DNA and incomplete complementary DNA were detected. The constructed biosensor exhibited good selectivity, reproducibility, and stability, providing a promising strategy for the detection of other gene mutations by electrochemical biosensors. Graphical Abstract
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MOLECULES
·
2023
·Vol. 28
·期 7
·3175
·
IF 4.6
Xiaolei Song,Congzhu Xu,Wendong Yao,Jieyun Wen,Qufu Wei,Yonggui Li,Xinqun Feng
Magnetic protective fabrics with fine wearability and great protective properties are highly desirable for aerospace, national defense, and wearable protective applications. The study of the controllable preparation method of Nd3+doped in Fe3O4nanoparticles with supposed magnetic properties remains a challenge. The characterization of the microstructure, elemental composition, and magnetic properties of NdFe2O4nanoparticles was verified. Then, the surface of NdFe2O4was treated with glyceric acid to provide sufficient –OH. Subsequently, the connection of the nanoparticle by the succinimide group was studied and then grafted onto cotton fabrics as its bridging effect. The optimal loading rate of the functional fabrics with nanoparticles of an average size of 230 nm was 1.37% after a 25% alkali pretreatment. The color fatness to rubbing results showed better stability after washing and drying. The corresponding hysteresis loop indicated that the functional fabrics exhibited typical magnetism behavior with a closed “S” shape and a magnetic saturation value of 17.61 emu.g−1with a particle size of 230 nm. However, the magnetic saturation value of the cotton fabric of 90 nm was just 4.89 emu.g−1, exhibiting controllable preparation for the aimed electromagnetic properties and great potential in radiation protective fields. The electrochemical properties of the functional fabrics exhibited extremely weak electrical conductivity caused by the movement of the magnetic dipole derived from the NdFe2O4nanoparticles.Keywords:NdFe2O4nanoparticles;grafting;cotton fabric;magnetic protective
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaohan Meng,Ze Lv,Liyin Shi,Tianzhen Jiang,Shaoyang Sun,Yan Li,Jianguo Feng
Residues of pyrethroid pesticides in aquatic environments seriously threaten aquatic organisms and the human health. Herein, a novel highly dispersed and recyclable composite ZIF-8 and SiO2 double-layer-modified Fe3O4 nanoparticle, named Fe3O4@ZIF-8@SiO2 nanoparticle, was synthesized via a layer-by-layer assembly method to remove pyrethroid insecticides (namely, fenvalerate, β-cyfluthrin, and tetramethrin) from water. The physical properties of the Fe3O4@ZIF-8@SiO2 nanoparticles were characterized via scanning electron microscopy, elemental mapping, energy-dispersive X-ray spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, inductively coupled plasma spectroscopy, thermogravimetric analysis, Brunauer–Emmett–Teller surface area analysis, dispersion analysis, and vibrating sample magnetometry. The prepared Fe3O4@ZIF-8@SiO2 nanoparticles exhibited excellent adsorption performance and high dispersibility and could be rapidly separated from water using an external magnetic field. The Fe3O4@ZIF-8@SiO2 nanoparticles exhibited the strongest adsorption effect at an adsorbent dosage of 10 mg, an adsorption time of 40 min, and a pH of 7. The fitted model for the adsorption process was consistent with the proposed secondary kinetic model and Sips isotherm model. The Fe3O4@ZIF-8@SiO2 nanoparticles exhibited maximum adsorption capacities of 316.23, 364.43, and 258.69 mg g–1 for fenvalerate, β-cyfluthrin, and tetramethrin, respectively. The Fe3O4@ZIF-8@SiO2 nanoparticles retained most of their adsorption capacity after five reuse cycles when acetone was used as an eluent for desorption. The mechanisms involved in the adsorption process included π–π stacking interactions, hydrogen bonds, hydrophobic interactions, and pore filling effects. This study provides a potential design for rapidly recoverable and reusable nanoparticles that can be used to effectively adsorb pyrethroid insecticides in wastewater.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Haijun Liu,Caizhen Liang,Jianjun Chen,Yuewen Huang,Fei Cheng,Fubin Wen,Bingbing Xu,Bin Wang
In this work, a novel and facile technique, epoxy-water-inorganic filler suspended emulsion polymerization , was proposed to fabricate 3D network porous graphene nanoplatelet (GNP)/Fe 3 O 4 /epoxy nanocomposites with low density of 0.34–0.73 g/cm 3 . The obtained porous nanocomposite with 7 wt% graphene nanoplatelets and 7 wt% Fe 3 O 4 nanoparticles loading exhibited satisfactory specific electromagnetic interference (EMI) shieling effectiveness of ∼37.03 dB/(g/cm 3 ), which was much higher than that of the solid counterparts (28.30 dB/(g/cm 3 )). In addition, the porous GNP/Fe 3 O 4 /epoxy nanocomposites also possessed outstanding thermal stability and mechanical property, which makes it a potential EMI shielding material in the fields of aerospace and electronic industries.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2019
·
IF 4.865
Juan Tang,Jie Wang,Hui Jia,Haitao Wen,Juan Li,Wenbin Liu,Jingyu Li
For the low-concentration oily micro-polluted water formed by the leakage of refined oil products, an unexpensive and high-efficiency magnetic enhanced flocculation method was introduced in this study. First, the performance of magnetic flocculation(MF) to remove oily contaminants was discussed. The results indicated that it achieved more than 95% removal in only 1min with 50mg/L-Polyaluminum chloride(PAC), 50mg/L-Fe 3 O 4 and10mg/L- Polyacrylamide (PAM). The novel indexs R δ and S i were proposed to evaluate the oil removal with UV-Abs in-situ method. According to the adsorption kinetics of oil contaminants, the adsorption kinetics changed from pseudo-first-order to pseudo-second-order kinetics after the addition of Fe 3 O 4 on the basis of conventional coagulation (CF). It was transformed into intraparticle diffusion kinetics when the PAM continued to be added. Combined with the Fe–O–Al bond in the FTIR spectrum of flocs, the main mechanism of MF is enhanced charge neutralization and hydrogen bond adsorption. In addition, it was shown that satisfactory oil removal after recover, which indicated the great potential of a sustainable way by reusing low-cost magnetic seeds.
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RSC Advances
·
2019
·Vol. 9
·期 41
·23545-23553
·
IF 3.049
Jianhui Li,Fan Yang,Quan Zhou,Lijie Wu,Wenying Li,Ruipeng Ren,Yongkang Lv
The ternary magnetic Fe3O4/BiOBr/BiOI (x : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) is superior to other Fe3O4/BiOBr/BiOI (x : 3 : 1). Compared with binary magnetic Fe3O4/BiOBr (0.5 : 1) prepared in our previous work, the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) has obvious advantages in photocatalytic activity and adsorption capacity. And the specific surface area (48.30 m2 g−1) is much larger than that of the previous report (Fe3O4/BiOBr/BiOI (0.5 : 2 : 2)) synthesized by a co-precipitation method. Besides, after 25 s of magnetic field, Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) can be rapidly separated from water. After eight recycling cycles, the magnetic properties, photocatalytic activity, crystallization and morphology of the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) catalyst remain good. The possible photocatalytic degradation mechanism of RhB under Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) photocatalyst was also proposed. The results indicate that the ternary magnetic Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) composite with high photocatalytic degradation efficiency, good magnetic separation performance and excellent recyclability and stability has potential application prospect in wastewater.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Zhi Zhang,Yueping Guan,Guoli Xu,Chen Guo
In this submission, a novel washing-free immunosensor was designed for chemiluminescence immunoassay (CLIA) of tumor marker using human Alpha-fetoprotein (AFP) as a representative. Reactive groups were introduced on the surface of the solvothermally prepared Fe 3 O 4 magnetic submicron particles (MSPs) and the dual-functional polyethylene glycol (PEG) linkers were modified to reduce the non-specific adsorption capacity of the particle surface and further to immobilize N -(4-aminohexyl)- N -ethylisoluminol (AHEI) and anti-AFP antibody on the surface of the particles. After incubation with AFP and horseradish peroxidase (HRP) labeled anti-AFP antibody respectively, the formed sandwich-type immunocomplexes on the particle surface could lead to the close proximity between AHEI and HRP, thus eventually leads to an increase in the detected chemiluminescence (CL) signal. As a bound HRP labeled anti-AFP antibody produces much stronger CL signal than an unbound one, this approach eliminates the time- and labor-consuming washing steps usually required of such assays. Under the optimal conditions, this present method shows a wide quantitative range from 1 to 250 ng mL −1 with a detection limit of 1.751 ng mL −1 . The detection limit was sufficient for measuring physiological (0–20 ng mL −1 ) and clinical (>20 ng mL −1 ) AFP levels. This method can also be applied in serum samples, and also avoid the problem of particle aggregation caused by multiple separation and washing steps.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 10
·10174-10187
·
IF 2.914
Ren Hong-shan,Cao Zhan-fang,Wen Xin,Wang Shuai,Zhong Hong,Wu Zai-Kun
In this paper, a magnetic nano-Fe 3 O 4 /triethanolamine/GO composite (TEA-GO-FE) was prepared by using graphene oxide (GO), triethanolamine (TEA), and ferric chloride. The result indicates that triethanolamine acted as an important role for the growing of Fe 3 O 4 and adsorption ability of composite material. The synthesis mechanism of TEA-GO-FE was investigated through the medium of SEM-EDS, XRD, FT-IR, and TEM. The characterization results indicated Fe 3 O 4 nanoparticles have been successfully loaded on the surface of graphene oxide and they were encapsulated by TEA and have excellent stability. According to the results of XRD, the general particle size of Fe 3 O 4 on TEA-GO-FE was 27.5 nm. In order to understand the adsorption properties of TEA-GO-FE for Pb 2+ and Cu 2+ , this article uses a static adsorption study method. The optimized adsorption conditions are as follows: pH = 5.0, temperature is 293.15 K, and the ion concentration is 100 mg/L. Under the optimized prerequisites, the adsorption capacities of Pb 2+ and Cu 2+ were 121.5 mg/g and 68.7 mg/g, separately. Through thermodynamic as well as kinetic studies, the adsorption process of Pb 2+ and Cu 2+ on TEA-GO-FE is a self-heating process.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Yujie Dong,Xinxin Cui,Xu Lu,Xinchi Jian,Qinglong Xu,Chaoqun Tan
Magnetic nanocomposite β-alaninediacetic acid-modified Fe 3 O 4 (β-ADA@Fe 3 O 4 ) was prepared, characterized and evaluated to activate peroxymonosulfate (PMS) for improved degradation of sulfadiazine (SD). The results reveal that β-ADA@Fe 3 O 4 express more efficient catalytic activity in PMS inducement compared with Fe 3 O 4 , and the observed pseudo first rate constant ( k obs ) of SD degradation is enhanced from 1.05 × 10 −2 to 7.02 × 10 −2 min −1 when Fe 3 O 4 is replaced by β-ADA@Fe 3 O 4 . The highest removal rate 54.0% occurs when [PMS] 0 and m(β-ADA@Fe 3 O 4 ) 0 was 0.3 mM and 0.8 g/L at neutral pH. High intensity of hydroxyl radicals ( OH) and relatively low intensity of sulfate radicals (SO 4 − ) are distinguished in system by scavenging experiments and electron paramagnetic resonance (EPR) tests. Results point that β-ADA would significantly promote the circulation of Fe 2+ -Fe 3+ on the surface of β-ADA@Fe 3 O 4 , producing more radicals ( OH, SO 4 − ). The findings herein imply that β-ADA@Fe 3 O 4 is an efficient and green catalyst in activation of peroxymonosulfate under neutral environment.
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COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Yang Zhang,Zhenqian Zhang,Jingyu Li,Guoxin Sui
The uniform dispersion of Fe 3 O 4 nanoparticles and strong interfacial bonding with epoxy matrix are crucial for Fe 3 O 4 /epoxy composite with enhanced mechanical and thermal properties. Cube pure Fe 3 O 4 nanoparticles (PF NPs) by poly (dopamine) (PDA) coated and (3-aminopropyl) triethoxysilane (APTES) grafted (PAF NPs) are successfully prepared via co-precipitation and seed polymerization method with an aim to enhance the dispersion and interfacial bonding with the epoxy matrix. The tensile strength of PAF/epoxy (1 wt%) increases from 57.8 MPa to 65.5 MPa (a rise scope of almost 13.3%) compared to pure epoxy. The thermal stabilities of PAF/epoxy composites with various PAF contents (1 wt%, 2 wt%, 3 wt%) are higher than that of pure epoxy. The saturation magnetization (Ms) of PAF/epoxy increases from 0.125 to 0.7 emu/g with PAF loading contents increasing from 0.5 to 3 wt%. The results suggest that dispersion and interfacial bonding of nanoparticles make a pivotal contribution to the enhanced performances of composites.
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