JOURNAL OF NANOPARTICLE RESEARCH
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2014
·Vol. 16
·期 11
·1-10
·
IF 2.278
Yao Yang Rong,Huang Wan Zhen,Zhou Huan,Cui Xia,Zheng Yi Fan,Song Xu Chun
A core–shell nanostructured magnetic photocatalyst Fe 3 O 4 @SiO 2 @Ag 3 PO 4 with a grain size ranging from 200 to 400 nm was prepared via a facile and effective method. The as-prepared products were characterized using X-ray diffraction, high-angle annular dark field-scanning transmission electron microscopy, energy-dispersive spectroscopy, and UV–Vis diffuse reflectance spectra. The photocatalytic activity was evaluated by the degradation of 10 −5 M RhB solution under visible light irradiation with a cut-off filter ( λ ≥ 420 nm). The results showed that nearly 100 % color removal efficiency was achieved in 45 min with the presence of Fe 3 O 4 @SiO 2 @Ag 3 PO 4 photocatalyst. Furthermore, it can be easily recollected from the solution by magnetic separation and efficiently recycled without major loss of activity due to its superior magnetic responsibility and extremely high reusability, exhibiting highly potential applications in water purification avoiding the secondary pollution.
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高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2014
·
IF 1.979
Hongbo Tang,Yuchang Su,Jiang Tan,Te Hu,Jinyu Gong,Lihua Xiao
In this work, LaB 6 @SiO 2 nanoparticle with a core–shell structure was synthesized and doped into Poly(vinyl butyral) (PVB) matrix to prepare LaB 6 @SiO 2 –PVB nanocomposite film. Field emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and ultraviolet–visible–near infrared spectroscopy (UV–vis–NIR) were employed to characterize these materials. The TGA and UV–vis–NIR results show that LaB 6 @SiO 2 nanoparticle contributed to improving thermal stability of PVB in LaB 6 @SiO 2 –PVB film, with an increase of almost 60 °C from the initial decomposition temperature in the case of the neat PVB film; additionally, maximum transmittance in visible region red-shifted from 605 to 645 nm and maximum absorption in near-infrared region moved slightly from 1466 to 1472 nm. In short, the LaB 6 @SiO 2 NPs could be a potential candidate for transparent and heat insulation materials.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fan Wang,Lijuan Zhang,Yeying Wang,Xijian Liu,Sohrab Rohani,Jie Lu
The graphene oxide (GO) functionalized by Fe 3 O 4 @SiO 2 @CS-TETA nanoparticles, Fe 3 O 4 @SiO 2 @CS-TETA-GO, was firstly fabricated in a mild way as a novel adsorbent for the removal of Cu(II) ions and methylene blue (MB) from aqueous solutions. The magnetic composites showed a good dispersity in water and can be conveniently collected for reuse through magnetic separation due to its excellent magnetism. When the Fe 3 O 4 @SiO 2 @CS- TETA-GO was used as an absorbent for the absorption of MB and Cu(II), the adsorption kinetics and isotherms data well fitted the pseudo-second-order model and the Langmuir model, respectively. Under the optimized pH and initial concentration, the maximum adsorption capacity was about 529.1 mg g −1 for MB in 20 min and 324.7 mg g −1 for Cu(II) in 16 min, respectively, exhibiting a better adsorption performance than other GO-based adsorbents reported recently. More importantly, the synthesized adsorbent could be effectively regenerated and repeatedly utilized without significant capacity loss after six times cycles. All the results demonstrated that Fe 3 O 4 @SiO 2 @CS-TETA-GO could be used as an excellent adsorbent for the adsorption of Cu(II) and MB in many fields.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 34
·期 7
·1700117
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IF 4.474
Yanning Qu,Renliang Huang,Wei Qi,Qi Qu,Rongxin Su,Zhimin He
Encapsulation of enzymes with enhanced activity and recyclability in water-in-oil Pickering emulsions is a simple and efficient method for their immobilization; however, the effect produced by the structure of colloidal particles on the stabilization of the Pickering emulsion for enzyme catalysis has not been investigated in detail. In this study, four types of hydrophobic Fe 3 O 4 @SiO 2 nanoparticles (NPs) with similar chemical compositions, particle diameters, but different surface characteristics have been prepared and utilized for enzyme encapsulation in various water-in-oil magnetic Pickering emulsions, after which the relationship between NPs structure, size of emulsions droplets, and enzyme activity is examined. The obtained results indicate that (i) the more hydrophobic Fe 3 O 4 @SiO 2 NPs cause the higher enzyme activity; (ii) the higher hydrophobicity of oil phase also increases the enzyme activity, especially for Fe 3 O 4 @w-SiO 2 NPs which form in the solvent of water. The results are mainly attributed to the higher specific surface area of emulsion droplets and interfacial mass transfer of substrates through the interfaces of droplets. The reported data provide new insights into the mechanism of stabilization of Pickering emulsions for enhancing enzyme activity and demonstrate efficient theoretical references for enzyme immobilization and synthesis of stable and active biocatalysts with high recyclability.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 126
·103982-103988
·
IF 3.84
Zheng Han,Xiang Li,Minhua Zhang,Zongzhang Liu,Meixiang Gao
A series of ZrO2–SiO2 catalysts synthesized by sol–gel method were investigated for the 1,3-butadiene formation from bioethanol and acetaldehyde. The influence of ZrO2 content and reaction conditions on catalytic performance were studied. The catalysts were characterized by N2 adsorption–desorption analysis, temperature-programmed desorption of NH3 (NH3-TPD), IR spectroscopy of adsorbed pyridine (Py-IR), Fourier Transform Infrared Resonance (FTIR), X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). These characterization results indicated that suitable intensity of acid sites, especially Lewis acid, are very crucial to obtain an active catalyst. The catalysts showed significantly higher selectivity for C4 chemicals, and 2 wt% ZrO2 content reached the highest selectivity to BD (69.7%), at space velocity (WHSV) of 1.8 h−1.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jianjun Li,Yanfeng Wu,Jungang Cao,Zhonglin Wei,Ying Guo,Qun Wang,Qingyu Peng,Yibin Li,Xiaodong He
In this paper, SiO 2 -TiO 2 hybrid fibres are fabricated using the electrospinning technique and Eu 3+ is successfully doped into the fibres through a simple sol-gel approach. The obtained SiO 2 -TiO 2 hybrid fibres are subjected to heat treatments at 600 °C, 800 °C and 1200 °C. The silica fibres subjected to a high temperature of 1200 °C become brittle and easily broken. Furthermore, the X-ray diffraction patterns demonstrate that crystalline titania forms in the SiO 2 -TiO 2 samples treated at 1200 °C, and excellent flexibility is demonstrated in the corresponding SiO 2 -TiO 2 non-woven mat. Moreover, the stress-strain curve demonstrates that the SiO 2 -TiO 2 mat heat-treated at 1200 °C exhibits typical elastic-plastic behaviour. Finally, the emission intensity of Eu 3+ of the SiO 2 -TiO 2 fibres is higher than that of the analogous SiO 2 fibres. This method can be adapted to fabricate inorganic-based hybrid fibres and will pave the way for the implementation of SiO 2 -TiO 2 non-woven mats in related research fields.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Yu Liu,Zimo Lou,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, SiO 2 -EDTA was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid, trisodium salt (EDTA-silane) and hydroxyl groups for enhanced removal of Pb(II), Pb(II)-Cit (the clathrate generated by Pb(II) and trisodium citrate dehydrate(Cit)) and Pb(II)-EDTA(20%) from aqueous solutions. SiO 2 -EDTA composites were characterized using SEM, TEM, EDX-mapping, FTIR, XPS and TGA analyses. The influence of solution pH, initial concentration, contact time and co-existing interferents were also studied. Results demonstrated that the composite successfully adsorbed 147.52, 107.65 and 124.18 mg g −1 of Pb(II), Pb(II)-Cit, and Pb(II)-EDTA (20%), respectively with the initial Pb(II) concentration of 100 mg L −1 . Kinetics study revealed that the adsorption rate was significantly high at the beginning and then reached to equilibrium within 1.0 h. Moreover, Pb(II) adsorption capacities were found to considerably affected by co-existing cations and not inhibited by natural organic matter (NOM). Characterization analyses confirmed that EDTA was successfully assembled on SiO 2 which had been used as a supporting matrix due to its huge specific surface area. Findings from this study suggested that the present composite could be considered as a promising adsorbent for large scale treatment of wastewater containing elevated Pb(II) concentration.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2017
·
IF 2.603
Xiaona Zhang,Jiahua Niu,Xiaoting Zhang,Rui Xiao,Minghua Lu,Zongwei Cai
In this research, a modified Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) method based on graphene oxide@SiO 2 (SiO 2 @GO) nanocomposite as adsorbent of dispersive solid-phase extraction (dSPE) combined with high performance liquid chromatography (HPLC) for the analysis of four plant hormones in different plants was established. The as-prepared SiO 2 @GO was characterized by scanning electron microscopy, transmission electron microscopy and infrared spectroscopy. The experimental conditions for dSPE, including the ratio of material to liquid, pH of sample, adsorption and desorption time, desorption temperature as well as desorption solution, were investigated. The detection limits for the analysis of indole-3-acetic acid, indole-3-butyric acid, 1-naphthylacetic acid and abscisic acid were achieved below 0.05 μg mL −1 . The established method was applied to the analysis of the plant hormones in fruits, vegetables and other food samples. The obtained results indicated that the method was sensitive, accurate, convenient and quick, which provided an alternative analytical approach for plant hormones in complex matrices.
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PubMed
高影响因子
ChemCatChem
·
2025
·
IF 3.9
Liang Zhang,Ting Hu,Weiwei Ma,Xuan Liu,Chengxi Huang,Hailing Huo,Tongyu Wang,Qiang Ju,Fang Wu,Erjun Kan,Ang Li
The photocatalytic CO2 reduction reaction (PCRR), that is, the artificial photosynthesis, is a promising route for the clean utilization of renewable resources. But poor selectivity resulting from the competing hydrogen evolution reaction (HER) in aqueous solution limits its practical applicability. However, the conventional polymers enhanced surface method hinder the transfer of charge carriers from catalysts to reactants. Here in, we fabricated a photocatalyst with hydrophobic mesoporous mask. The hydrophobic SiO2 mask prevents Pt from H2O and facilitates effective contact between CO2 (gas) and photocatalyst. Owing to the hydrophobic property of SiO2 mask, CO2 gas can be trapped within the channels of the mesopores, thereby promoting the PCRR reaction. The photocatalytic PCRR generation rate of CH3OH can reach 156.4 μmol·g-1·h-1. This article will provide a new approach for improving CO2 reduction and selectivity through hydrophobic modification of photocatalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoyan Chen,Jiangdong Cui,Xinyu Yang,Taoyue Yuan,Jiacheng Ge,Mengtao Ma,Shunke Ding,Wenhai Chu
The core bottleneck in water decontamination lies in trigging the selective removal of trace contaminants in the presence of complex water matrices, overcoming the inevitable consumption of oxidants and energy input by the water matrix. Here, the selective removal of phenolic contaminants with permanganate (PM) oxidation mediated by 2,2,6,6-tetramethylpiperidinooxy (TEMPO)-functionalized silica (SiO 2 @TEMPO) was firstly reported. SiO 2 @TEMPO was synthesized by covalently bonding 4-oxo-2,2,6,6-tetramethylpiperidinooxy onto SiO 2 through a 3-aminopropyltriethoxysilane bridge. The loading capacity of Wt% for nitrogen element in SiO 2 @TEMPO are 1.01–1.27 %. The degradation rate of tetracycline (around 1.50 min −1 ) with SiO 2 @TEMPO/PM are around 15 folds higher than that with PM, attributed to the formation of the reactive N-oxoammonium cation via single-electron transfer during PM oxidation. SiO 2 @TEMPO exhibited excellent stability and recyclability after five consecutive cycles of tetracycline degradation. Three transformation pathways (hydroxylation, demethylation, and dehydration) for tetracycline degradation by SiO 2 @TEMPO/PM were proposed based on the identification of 36 transformation products using HPLC/Q-Orbitrap HRMS. Thereinto, the attack of the N-oxoammonium cation in SiO 2 @TEMPO on the phenolic hydroxyl group to form corresponding hydroxylation and quinylation products accounted for the dominant degradation pathway. SiO 2 @TEMPO/PM also demonstrated remarkable adaptability across a wide pH range of 5.0–9.0, indicating its potential for practical applications. The significant resistance to the inhibitory effects of co-existing water matrix components (humic acid, cations and anions), along with the marked differences in degradation efficiency between phenolic and non-phenolic contaminants, demonstrate the selectivity of SiO 2 @TEMPO/PM towards phenolic contaminants. These results offer new insights into the selective removal of phenolic contaminants and pave the way for the development of efficient and sustainable strategies for water remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shuai He,Guicheng Jiang,Qian Wang,Lang Bian,Bin Yang
Lead zirconate titanate (PZT) based piezoelectric ceramics are applied in ultrasonic transducers and multilayer actuators fields universally. Excellent piezoelectric properties of PZT-based ceramics of low sintering temperature are crucial for the applications of high-power motors and multilayer piezo-actuators due to the reduction of cost and energy consumption. In this paper, a ternary solid-solution ceramic system 0.05Pb(Mn 1/3 Sb 2/3 )O 3 -0.47PbZrO 3 -0.48PbTiO 3 (PMS-PZT) was studied. A new complex additive composed of SiO 2 -Li 2 O 3 -CuO was doped into the PMS-PZT ceramics. The doping of CuO and Li 2 O 3 was discovered to be able to lower the sintering temperature and remain electric properties efficiently, while the doping of SiO 2 can decrease the grain size and increase the density. All ceramic samples were fabricated by solid-phase reaction method and sintered in the low temperature range from 800 °C to 1000 °C. The phase structure, morphology of natural surface and electrical properties of ceramics doped by 0.5 wt% additive were characterized. The 0.5 wt% additive doped PMS-PZT ceramics exhibit remarkable comprehensive piezoelectric properties sintered at 900 °C ( d 33 = 343 pC/N, Q m = 1016, T c = 328 °C, tan δ = 0.4 % (at 25 °C), ε r = 1344, d 33 * = 490 pm/V). The sintering temperature 900 °C is significantly below the melting point of Ag (961.9 °C) and Cu (1083.4 °C), so the more cost-effective Cu internal electrodes and Ag rich Ag/Pd electrodes can be used to substitute the expensive Pd rich Ag/Pd internal electrodes in the production of devices composed of multilayer ceramic. The research of this work provides an important candidate additive for the applications of high-performance transducers and multilayer actuators with low cost.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zhang-Ao Shi,Jia-Min Wu,Chen Mao,Li-Xiang Fu,Shou-Lei Yang,Jing-Xian Zhang,Yu-Sheng Shi
Vat Photopolymerization (VPP) technology is expected to address the challenges of preparing high-strength, precise, and complex SiC ceramics. However, the poor printability of SiC powders and the low strength of the resulting SiC ceramics remain significant obstacles. To overcome these issues, this study proposes a SiO 2 /AlOOH double-coating method for modifying SiC powders. The effects of AlOOH content in the double coating on the properties of SiC powders, slurries, and ceramics were investigated. Additionally, the impact of sintering additives on the densification behavior and mechanical properties of SiC ceramics was examined. The results indicated that increasing the AlOOH content in the double coating decreased the UV absorption of the powders and increased the curing depth of the slurries, but also increased the viscosity of the pastes. Moreover, while increasing the AlOOH content in the double coating improved the densification and flexural strength of the ceramics, the effect was significantly less compared to optimizing the sintering additive. Using SiO 2 /AlOOH double-coated SiC powders containing 2.5 wt% AlOOH and 10 wt% Al 2 O 3 -Y 2 O 3 -MgO (mass ratio 1:8:1) sintering additives, SiC ceramics were prepared with a relative density of 91.1 ± 3.5 %, a Vickers hardness of 1685.6 ± 86.4 HV, and a flexural strength of 281.7 ± 14.4 MPa, much higher than that of other SiC ceramic prepared using the same process. This represents the highest flexural strength of SiC ceramics prepared by VPP technology to date, providing a new method for the preparation of high-strength SiC ceramics via VPP.
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