APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yaohui Xu,Liangjuan Gao,Yang Zhou
The core–shell nanoparticles with magnetic Fe 3 O 4 as core and porous SiO 2 as shell were synthesized by the hydrolysis and condensation of tetraethyl orthosilicate on Fe 3 O 4 seed in an alkaline medium. Subsequently, the inorganic/organic hybrid nanocomposites based on core–shell Fe 3 O 4 @SiO 2 nanoparticles were fabricated using “grafting-from” strategy, in which a macrocyclic dioxotetraamine (1,4,8,11-tetraazacyclotetradecane-5,7-dione, TACTDD) was grafted onto the end of Fe 3 O 4 @SiO 2 surface. The as-synthesized nanocomposites possessed three functionalities: Firstly, the nanocomposites showed a selective fluorescence response toward Fe 3+ ion with a detection limit of 6.0 × 10 −7 mol/L, the eye-perceived fluorescence quenching under ultraviolet light could be used for the qualitative recognition of Fe 3+ ion; Secondly, the nanocomposites were an excellent adsorbent, the adsorption efficiency for Fe 3+ could reach 99.6% when the initial concentration was 200 mg/L without pH preadjustment, and over 85% for Zn 2+ , Hg 2+ and Pd 2+ ions. Moreover, the nanocomposites could be recycled by Na 2 EDTA, the desorption ratio of Fe 3+ , Zn 2+ , Hg 2+ and Pd 2+ ions only reduced slightly with six cycles, and all remained above 91%; Thirdly, the nanocomposites had superparamagnetism with a magnetization of 29.6 emu/g, this strong magnetic sensitivity can facilitate the sustainable removal of heavy metal ions in practical applications.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Tianna Wu,Shuo Yang,Wei Feng,Kaiyue Li,Yanru Li,Lili Wang,Rui Chen,Xiaodong Yang,Lulu Liu,Donglai Han
Equipped with surface-enhanced Raman scattering (SERS) effect and magnetic manipulation capacity, a new paradigm of recyclable SERS substrates based on Fe 3 O 4 nanoparticles (NPs) @SiO 2 @PEI-DTC adhesive layer @Au-Ag alloy quantum dots (QDs) were successfully prepared via engineering hydrothermal and seed deposition techniques. The SERS performance and uniformity of those substrates with different gold-silver (Au-Ag) weight ratios were evaluated by 4-aminothiophenol (4-ATP) molecules, revealing that the relative standard deviations (RSDs) of all substrates were less than 12 %, with the optimal SERS substrate achieving an enhancement factor (EF) of up to 1.39 × 10 5 . This phenomenon can be attributed to the magnetic core and plasmonic resonance properties of Au-Ag alloy QDs, which result in abundant interparticle hotspots in the Fe 3 O 4 @SiO 2 @PEI-DTC@Au-Ag (FSPAA) nanocomposites. Furthermore, the optimal FSPAA nanocomposite was employed as a SERS substrate for rapid non-destructive detection of thiram on fruit surfaces. The SERS signal intensity exhibited a robust manifesting a linear association with thiram concentration within the span of 1 × 10 −4 to 1 × 10 −9 M, and the minimal detectable concentration was 1.04 × 10 −10 M. The FSPAA core–shell nanocomposites exhibit high reusability and reliability and hold great promise for the practical applications in on-site assessment of food/environmental safety, as well as in spectroscopic identification of molecules adsorbed onto fruit surfaces.
研究领域:
分析化学
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食品安全
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Liang Wang,Anqi Liu,Zhaohui Zhang,Bin Zhao,Yingming Xia,Yun Tan
In this work, a novel catalyst of Fe 3 O 4 @SiO 2 @Yb 2 O 3 was prepared and the degradation of thymol in reverse osmosis concentrate using ozonation was explored. The operational parameters, such as ozone dosage (8–48 mg·min − 1 ), initial thymol concentration (20–100 mg·L − 1 ), initial pH value (3–11), and catalyst Fe 3 O 4 @SiO 2 @Yb 2 O 3 dosage (0.2–1.0 g), were studied focusing on the thymol degradation and COD removal. The results indicated that the increase in ozone dosage, initial pH value, and Fe 3 O 4 @SiO 2 @Yb 2 O 3 dosage accelerated the thymol degradation and COD removal, while the increase in initial thymol concentration hampered the effect of ozonation. A pathway of thymol degradation by catalytic ozonation was proposed based on the intermediates detected by gas chromatography-mass spectrometer and ion chromatography . This paper can provide basic data and technical alternative for pollutant removal from reverse osmosis concentrate by ozonation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Taiguang Li,Mingyong Wang,Qingzheng Hou,Yaqi Hou,Kai Xuan,Yongmei Hao
One kind of novel magnetically separable graphene-based titanium dioxide photocatalytic nano-adsorbents (GO-FSNTs) were prepared for the adsorption-photodegradation of phenanthrene under visible light. The GO-FSNTs displayed the high adsorption-photodegradation efficiency and 10 mg of 0.6% GO-FSNT (wt%) can remove 94.9% of phenanthrene within 4 h. The introduction of a small amount of GO enables 0.6% GO-FSNT to selectively adsorb phenanthrene through the π-π interaction, reduce the light-shielding effect and improve separation of photogenerated carriers effectively. Meanwhile, the N-TiO 2 shell is occupied by adsorbed water molecules which can spontaneously repair lattice oxygen. Furthermore, the more hydrophilic surface of 0.6% GO-FSNT is formed by increased photoinduced hydroxyl groups under visible light during photodegradation. The photoinduced hydroxyl groups can further generate OH and improve photocatalytic activity. The degradation pathway of phenanthrene was proposed based on intermediates analysis and density functional theory calculations. This work helps to reveal the relationship between the adsorption-photodegradation and the photoinduced hydrophilicity.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Xinyu Hu,Yongmei Wang,Liangliang Zhang,Man Xu,Jianfa Zhang,Wei Dong
Salecan, a novel water-soluble extracellular β-glucan, is very suitable for the hydrogel preparation. Here, pH-sensitive magnetic composite hydrogel was fabricated by the graft copolymerization of crotonic acid (CA) and N-(hydroxymethyl) acrylamide (HMAA) onto salecan in the presence of Fe 3 O 4 @SiO 2 nanoparticles for doxorubicin (DOX) delivery. The embedment of Fe 3 O 4 @SiO 2 nanoparticles into salecan-g-poly(CA-co-HMAA) hydrogel network endowed the material with magnetic property. In addition, DOX not only achieved effectively bound to the composite hydrogel, but also released in a controlled and pH-dependent manner. The application of an external magnetic field could significantly enhance the drug release rate. More importantly, the released DOX preserved its bioavailability. Taken together, these hydrogel drug carriers provide a promising platform for magnetically targeted drug delivery.
研究领域:
材料科学
·
药学
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 13
·5587-5598
·
IF 4.5
Sun Shanshan,Zhang Zihao,Li Shuhan,Le Jinxun,Qian Haixia,Yin Xiaoshuang,Liu Ying,Yang Wenzhong,Chen Yun
Magnetic core–shell nanomaterial Fe 3 O 4 –SiO 2 –Cu 2 O/Cu was first successfully synthesized using an economical strategy. Using Fe 3 O 4 as a magnetic center for easy recycling and SiO 2 as the connecting layer, Cu elements were evenly and steadily distributed on the surface of the Fe 3 O 4 –SiO 2 –Cu 2 O/Cu core–shell nanostructure. The magnetic catalyst performed outstanding catalytic reduction activity for 4-nitrophenol (4-NP), and the complete catalytic reduction of 4-NP was achieved within only 5 min. What’s more, the catalyst could be well recycled, and the catalytic efficiency remained more than 90% after being reused 24 times. Graphical abstract
研究领域:
纳米技术
·
催化
·
环境化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 39
·期 8
·6474-6481
·
IF 3.086
Yansheng Liu,Wei Zhang,Xinlin Li,Xuanduong Le,Jiantai Ma
In this study, Pd nanoparticles functionalized on the surface of a Fe3O4@SiO2@m-SiO2 nano-catalyst has been synthesised with accessible active sites and ultra-large surface areas. The Pd/Fe3O4@SiO2@m-SiO2 nano-catalyst can be recovered by applying an external magnetic field. The catalytic activity of Pd/Fe3O4@SiO2@m-SiO2 is tested in the catalytic reduction of 4-nitrophenol and the hydrodechlorination of 4-chlorophenol. The high catalytic activity is attributed to the well-dispersed Pd nanoparticles on the ultra-large surface of Fe3O4@SiO2@m-SiO2. Furthermore, the Pd/Fe3O4@SiO2@m-SiO2 nano-catalyst can be reused at least five times without significant loss in activity, which confirms its good stability. Therefore, the approach mentioned above that is based on core–shell structured magnetic Pd/Fe3O4@SiO2@m-SiO2 provides a useful platform for the fabrication of Pd NP based catalysts that feature easy accessibility, superior activity and convenient recovery.
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Kai Zhu,Zhuting Li,Fang Cheng,Chen Wu,Dong Cai,Qiuyu Zhang,Hepeng Zhang
Rapid self-healing of micro-configurations is an effective strategy to enhance the durability of superhydrophobic surfaces, however, this property is challenging to achieve. Here, a durable superhydrophobic coating with a precisely targeted self-healing ability to repair its’ dual structure was developed by spray-coating a polyimine film with a mixture of novel fluorinated epoxy resin and Fe 3 O 4 @SiO 2 –NH 2 nanoparticles . The superhydrophobic surface can heal both the broken morphology and wettability through a short irradiation process on account of its local photothermal conversion ability and dynamic imine bond, and can maintain the static water contact angle at a value higher than 159° even after six damage/healing cycles. Furthermore, superhydrophobic coatings can be controllably degraded in three ways. Additionally, because of the robust epoxy resin protection, the surface can withstand sixteen times the dynamic impact and still maintain a WCA greater than 150°. This preparation strategy may aid the fabrication of durable superhydrophobic surfaces for various practical applications.
研究领域:
材料科学
·
表面化学
·
纳米技术
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Ruili Xiao,Yini Pan,Jie Li,Lingyi Zhang,Weibing Zhang
The highly selective enrichment of phosphopeptides is vital for the research of phosphorylated proteomics. Herein, a magnetic bimetallic metal-organic framework (MOF) with Zr-O and Ti-O clusters (denoted as Fe 3 O 4 @SiO 2 @(Zr-Ti-PTA) 15 ) has been fabricated using a layer-by-layer assembly approach via the coordination of metal ions with carboxyl groups. The composite has large specific surface area (135.84 m 2 g −1 ) and superparamagnetism (62.03 emu g −1 ). Compared with single-metal cluster MOF, the Fe 3 O 4 @SiO 2 @(Zr-Ti-PTA) 15 showed higher binding capacity (100 mg g −1 ), enhanced affinity, better selectivity (n β-casein : n BSA = 1 : 2000) and sensitivity (0.3 fmol/μL) towards phosphopeptides due to the combination of the dual metal clusters. Furthermore, the Fe 3 O 4 @SiO 2 @ (Zr-Ti-PTA) 15 was successfully applied to extracting phosphopeptides from non-fat milk tryptic digest, and 10 mono-phosphopeptides and 22 multi-phosphopeptides were captured. As a result, 1294 phosphopeptides (476 multi-phosphopeptides and 818 mono-phosphopeptides) were selectively extracted and detected from tryptic digest of rat brain extract, indicating its great application potential in phosphorylated proteomics research.
研究领域:
分析化学
·
蛋白质组学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Ting Xu,Shuang Wang,Tao Wang,Xin Li,Yanli Chen,Qiong Wu,Lili Yang,Xiaoyan Liu,Maobin Wei,Jian Cao
Coupling Ag NPs and direct Z-scheme heterojunction in Fe 3 O 4 @SiO 2 @ZnO-PDA-Ag photocatalysts (FSZ-PDA-Ag) were constructed via the self-polymerization of dopamine. The effects of the loading amounts of Ag NPs on the structure, morphologies, and properties of the photocatalysts were investigated. Under ultraviolet and visible light irradiation, FSZ-PDA-Ag5 exhibited superior photocatalytic activity for tetracycline degradation. Direct Z-scheme ZnO-PDA heterojunction formed in FSZ-PDA-Ag could promote the transfer efficiency of electrons, and then inhibit the recombination of photo-generated charges. Meanwhile, the appropriate load of Ag NPs acted as another conductive channel to further facilitate the electrons transfer , which could extend the lifetime of the photo-generated charges. Thus, the multiple pathways of electrons transfer resulted in the enhanced photocatalytic activity , the degradation mechanism of FSZ-PDA-Ag5 was explored in detail. Moreover, this photocatalyst possessed superior cycling stability and reusability for the wastewater purification. This study may provide a reference for designing efficient and stable photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 19
·7842-7847
·
IF 1.938
Guan-Hua Wang,Yong-Qian Lei,Hua-Can Song
Metal–organic frameworks (MOFs), a novel class of hybrid inorganic–organic materials, possess high surface area, good thermal stability and selectivity, and thus have great potential for use as sorbent materials. MOF-177 is attractive for its large pores, high adsorptivity and selectivity, which has rarely been used in analytical science. Herein a facile magnetization of MOF-177 for rapid magnetic solid phase extraction of phenols from environmental water samples was studied, with analysis using gas chromatography-mass spectrometry. The magnetization of MOF-177 microcrystals as well as solid-phase extraction (SPE) of phenols was achieved simultaneously by mixing MOF-177 and Fe3O4@SiO2 microparticles in the water sample under sonication. Under the optimized conditions, the developed method showed good linearity within the range of 1–200 μg L−1, low detection limits (16.8–208.3 ng L−1) and quantitation limits (56.0–694.2 ng L−1). The recoveries are between 83.3 and 108.7% with the spiked level of 25 μg L−1. The results demonstrated that the Fe3O4@SiO2–MOF-177 magnetic microspheres are promising sorbents in the MSPE field in environmental samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Ruiyi Fan,Huiyu Min,Xingxing Hong,Qingping Yi,Wei Liu,Qinglin Zhang,Zhengrong Luo
In this paper, a new core-shell nanostructured magnetic bio-based composite was prepared by immobilizing persimmon tannin (PT) onto Fe 3 O 4 @SiO 2 microspheres, and the as designed Fe 3 O 4 @SiO 2 @PT was utilized for adsorptive recovery of Au(III) and Pd(II). The preparation, morphology, composition and magnetic property of Fe 3 O 4 @SiO 2 @PT were characterized. Adsorption parameters of Fe 3 O 4 @SiO 2 @PT towards Au(III) and Pd(II) including initial pH, reaction time, initial concentration of metal ions , effect of acidity and interference of coexisting metal ions were investigated. It is sufficiently confirmed that silica was coated on Fe 3 O 4 and persimmon tannin was immobilized on aminated Fe 3 O 4 @SiO 2 . The thickness of silica and loaded persimmon tannin are around 18 nm and 14 nm, respectively. With only 1.00 wt% of persimmon tannin, however, the maximum adsorption capacities of Fe 3 O 4 @SiO 2 @PT for Au(III) and Pd(II) were as high as 917.43 and 196.46 mg·g −1 , respectively. In addition, after adsorption of Au(III) and Pd(II), the magnetization saturation values ( Ms ) of Fe 3 O 4 @SiO 2 @PT were high enough to guarantee efficient magnetic seperation. Metallic gold could be facilely recovered from wastewaters containing Au(III).
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）