APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Hang Jia,Xiao Zhang,Xuejun Zeng,Rui Cai,Zhouli Wang,Yahong Yuan,Tianli Yue
With the increased risk of wound infection caused by pathogenic bacteria, silver nanoparticles have been considered as potential antibacterial nanosystem. However, the challenge of size control and agglomeration of silver nanoparticles need to be considered. Herein, the application of flower-like silver nanoparticles (Ag NPs) anchored Fe 3 O 4 @SiO 2 @MnO 2 hybrids (Ag/FSM) in the control of pathogenic bacteria and promotion of wound healing were reported. TEM results indicated the ultrafine Ag NPs were uniformly dispersed onto the surface of FSM. In vitro experimental results showed the Minimum inhibitory concentration (MIC) of Ag/FSM against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were 60 and 100 μ g mL −1 , respectively. Furthermore, in vivo investigation in mice demonstrated that the hybrids showed low toxicity and effectively promoted wound healing caused by the infection of E. coli . In summary, the results supported the possibility that Ag/FSM could be considered as an antibacterial agent with potential for the treatment of bacterial infections.
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高影响因子
E-POLYMERS
·
2021
·Vol. 21
·期 1
·072-081
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IF 2.025
Yujuan Qiu,Jirui Fu,Binqing Sun,Xiaojun Ma
Sustainable nanocomposites with transparent, biodegradable, and enhanced mechanical and barrier properties were prepared by the incorporation of SiO 2 into poly(3-hydroxybutyrate- co -3-hydroxyhexanoate) (PHBH) films and subsequent solvent casting. The crystallinity of composites could be increased by 67% with appropriate contents of SiO 2 , which proved that SiO 2 were effective nucleating agents for PHBH. And it was worth mentioning that the contributions of SiO 2 to the crystallization and thermal stability of composites are proved effectively by Avrami relationship and Horowitz and Metzger method. More importantly, compared with PHBH, it had not only an enhancement about 40% and 60% on the tensile strength and elastic modulus, respectively, but also half the reduction of the moisture and oxygen permeability which were much higher than the values of conventional plastics. The above, in conjunction with the low migration rate measured in food substitutes, illustrated unambiguously that the nanocomposites might be suitable for potential application in food packaging.
Graphical abstract
SiO 2 /PHBH nanocomposites with fine crystallization and improved mechanical and barrier properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Heng-Chen Liu,Hui-Xian Wang,Yu Yang,Zhao-Yong Ye,Keisuke Kuroda,Li-an Hou
A non-toxic and applicable surface-modified polyvinylidene fluoride (PVDF) membrane consisting of Prussian blue (PB) and aminating silica (A-SiO 2 ) nanoparticles was fabricated for the selective removal of trace radionuclide cesium (Cs) from water. The modified membrane denoted as PB/A-SiO 2 /PVDF exhibited high selective removal of cesium with a high permeate flux of more than 800 L/h∙bar∙m 2 in a wide pH range from 3 to 9. The adsorption experiments showed that the Langmuir isotherm model and the pseudo-second order model fitted well with the experimental results. The maximum adsorption capacity was 10.95 mg-Cs/g-membrane (i.e. 78.21 mg-Cs/g-PB sorbent on membrane) for the membrane at an initial Cs concentration of 50 mg/L. Based on the high Cs adsorption capacity of PB, the membrane could remove more than 97.5% Cs in the presence of the coexisting ions and organic matter for more than 10 h. The filtrated membrane could be effectively regenerated by NH 4 Cl, H 2 O 2 and HNO 3 solution with negligible decrease in removal efficiency after repeated use. With the high membrane flux and selective removal efficiency, the fabricated membrane can be potentially applied in Cs contaminated water treatment.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2020
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IF 6.984
Zilu Liu,Bingtao Tang,Shufen Zhang
Polyethylene glycol (PEG)/poly Acrylic acid (PAA)/silica (SiO 2 ) composite phase change materials (PCMs) with strong shape stability were successfully synthesized by a simultaneous sol-gel reaction, and in situ free radical polymerization . The network structure, shape stability, phase change enthalpy , and thermostability of the prepared materials were characterized through FT-IR, DSC , TGA , and XRD . The synthesized PEG/PAA/SiO 2 composite PCMs with a semi-interpenetrating network (semi-IPN) exhibited a high phase change enthalpy of 172.9 J/g and strong shape stability under 355 °C. The interaction between PEG and PAA/SiO 2 network was also discussed in this paper, as well as the relationship between the interaction, energy density , and shape stability. The prepared PEG/PAA/SiO 2 composite PCMs provided a novel method in preparing shape stable phase change materials.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
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Applied Sciences-Basel
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2020
·Vol. 10
·期 23
·8529
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IF 2.474
Junyi Wang,Tianlu Chen,Biao Xu,Yueqiu Chen
Porous rGO/SiO2nanocomposites with a “core-shell” structure were prepared as an efficient adsorbent for the liquid-phase adsorption of cationic neutral red (NR) dye. The samples were characterized with powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N2and water vapor adsorption/desorption methods. The NR removal ability and kinetics of the adsorption process of SiO2and the rGO/SiO2nanocomposites were investigated at 298 K. The rGO/SiO2nanocomposite SG 0.30 showed a superior adsorption of NR dye. In regard to NR at pH 5, we measured a superior adsorption capacity of 66.635 mg/g at an initial NR concentration of 50 mg/L. The experimental adsorption capacity of SG 0.30 was 3.791 times higher than that of SiO2. Then, we compared the results with similar materials used for NR removal. Moreover, the water adsorption sites provided by the nitrogen- and oxygen-containing groups might be one of the reasons for the increased adsorption of water vapor. The broad range of properties of the rGO/SiO2nanocomposite, including its simple synthesis, ability to be mass prepared, and strong adsorption properties, makes it a truly novel adsorbent that can be industrially produced, and shows potential application in the treatment of wastewater-containing dyes.Keywords:graphene;Silica;carbon-materials;nanocomposite;neutral red;surface modification;adsorption;Water Vapor Adsorption
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Mingliang Ma,Yuying Yang,Yan Chen,Yong Ma,Ping Lyu,Aiqi Cui,Weibo Huang,Zhe Zhang,Yanzheng Li,Feiyan Si
The flower-like Fe 3 O 4 /SiO 2 /MnO 2 /BiOBr-Bi magnetic composite photocatalyst was prepared in this work. The combination of BiOBr and Bi metal with flower-like MnO 2 constituted a heterojunction structure, which increased the specific surface area of the photocatalyst and promoted the separation of photo-generated carriers, resulting in the enhanced catalytic performance. The morphologies and the compositions of the photocatalyst were characterized in detail. Under simulated light, the degradation of organic dye methylene blue (MB) was used to research the photocatalytic activity. In the case of 15 mg photocatalyst, it was found that the photocatalytic degradation efficiency to the MB solution was 95.23% within 150 min. Moreover, the degradation rate of MB could still reach 81.11% after four cycles. The design of flower-like composites with magnetic core-shell structure provided a new method for fabricating photocatalysts having excellent catalytic performance and cyclic stability.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
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IF 5.774
Jinxin Xie,Weirui Chen,Yanfeng Lv,Haoyao Chen,Xukai Li,Laisheng Li
In this work, a hollow mesoporous CeO x @SiO 2 was synthesized and used to promote sulfanilamide (SA) mineralization in ozonation . SA mineralization was promoted to 68.2% by O 3 /CeO x @SiO 2 in 120 min, but only 30.0% in O 3 process. O 3 /CeO x @SiO 2 behaved the better at acidic and alkaline condition than that at neutral condition. CeO x @SiO 2 had the great ability in enhancing O 3 utility rate. Silanol (Si OH) in pore channel of SiO 2 shell was non-reactive with O 3 but could provide transmission way for O 3 to reach the inner CeO x core. Lewis sites, oxygen vacancies and surface hydroxyl groups induced by CeO x favored for the activation of O 3 . The excess electron at oxygen vacancies would be transferred to the absorbed O 3 molecular, which then generated reactive oxygen species (ROS) to mineralize SA. Hydroxyl radicals ( OH) and superoxide radicals ( O 2 − ) were the main ROS, which were recorded by EPR. The interfacial electron transfer process was revealed by LSV and ESI characterizations. SA degradation intermediates were also identified by HPLC-MS and IC, a possible degradation pathway was proposed. Moreover, CeO x @SiO 2 showed a good reusability, no obvious decline of TOC removal was found in four times’ uses. Water matrix would complete ROS with SA, which inhibited the SA removal of both O 3 and O 3 /CeO x @SiO 2 processes, but the better TOC removal efficiency was still obtained by O 3 /CeO x @SiO 2 in actual water.
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高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Dingyuan Liang,Xiangrui Wang,Ying Wang,Zhaomin Dong,Xiaoli Zhao,Wenhong Fan
Dissolved organic matter (DOM) in aquatic ecosystems reshapes the surface of nanoparticles (NPs) greatly. Understanding how these changes influence the bioavailability of NPs is critical for accurately predicting the ecological risks of NPs. A quantitative model based on the two-step internalization process enabled the differentiation between the adhesion ability of NPs to membranes and the internalization capacity. Using protozoa Tetrahymena thermophila as the test organism, fluorescein isothiocyanate-modified silica NPs (FITC-SiO 2 ) and silica-coated gold NPs (Au@SiO 2 ) were prepared to validate the model and study the influence of DOM on uptake. DOM reduced the ability of Au@SiO 2 to adhere onto cell membranes and the inhibitory effect of bovine serum albumin (BSA) and β-lactoglobulin was higher due to their higher molecular weights and the weaker interaction. Moreover, DOM increased the internalization capacity. 80% Au@SiO 2 was internalized in the presence of humic acid (HA), over 90% Au@SiO 2 was internalized in the presence of the two proteins, whereas only 60% were internalized by the control group. Next, the specific recognition of the cell internalization in the presence of DOM was confirmed. We concluded that the traditional “accumulation” may misestimate the true biological effect caused by NPs coated with DOM. NPs coated with highly bioavailable DOM pose a greater risk to aquatic ecosystems because they are more likely to be internalized by living organisms.
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PubMed
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 26
·5707-5721
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IF 5.344
Mingdi Sun,Dan Yang,Wu Fanqi,Zhao Wang,Hongjiao Ji,Zhiliang Liu,Shili Gai,Fangmei Zhang,Piaoping Yang
Photodynamic therapy (PDT) is a light-based modality for tumor treatment that involves the generation of reactive oxygen species (ROS) by the combination of light, a photosensitizer, and molecular oxygen. Nevertheless, the therapeutic effects of PDT are limited by hypoxic conditions that worsen with oxygen consumption during the PDT process. Photo/chemodynamic therapy (PCDT) based on the Fenton reaction is one strategy to improve ROS generation, provided a highly effective Fenton reagent is developed. In this research, SiO2@Cu7S4 nanotubes (NTs) were synthesized as a PCDT agent. This double-valence metal-sulfide composite material can react with H2O2 at the tumor site. SiO2@Cu7S4 NTs can produce more ROS than the traditional PDT agents, and besides, they can also be used as a photothermal therapy (PTT) agent. SiO2@Cu7S4 NTs will trigger the PTT effect under 808 nm irradiation and generate a large amount of heat to eradicate cancer cells. This heat will also promote the PCDT effect by increasing the reaction rate. Thus, the SiO2@Cu7S4 NT is a suitable material for PCDT and PTT synergistic oncotherapy. The 808 nm laser is selected as the appropriate excitation source, providing adequate penetration and minimal harm to normal cells. The experimental data presented herein demonstrate the promising photosensitive, Fenton-like, and photothermal performance of SiO2@Cu7S4 NTs. Furthermore, the findings could promote the development of PCDT and PTT synergistic therapy. Thus, this research provides a feasible method to design a single, multifunctional material for cancer treatment.
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PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 5
·883
·
IF 4.324
Bonan Zhao,Zhipeng Dong,Qiyan Wang,Yisong Xu,Nanxia Zhang,Weixing Liu,Fangning Lou,Yue Wang
The size-uniformed mesoporous Ag@SiO2nanospheres’ catalysts were prepared in one-pot step via reducing AgNO3by different types of aldehyde, which could control the size of Ag@SiO2NPs and exhibit excellent catalytic activity for the hydrogenation of nitrobenzene. The results showed that the Ag core size, monitored by different aldehydes with different reducing abilities, together with the ideal monodisperse core-shell mesoporous structure, was quite important to affect its superior catalytic performances. Moreover, the stability of Ag fixed in the core during reaction for 6 h under 2.0 MPa, 140 °C made this type of Ag@SiO2catalyst separable and environmentally friendly compared with those conventional homogeneous catalysts and metal NPs catalysts. The best catalyst with smaller Ag cores was prepared by strong reducing agents such as CH2O. The conversion of nitrobenzene can reach 99.9%, the selectivity was 100% and the catalyst maintained its activity after several cycles, and thus, it is a useful novel candidate for the production of aniline.Keywords:mesoporous;Ag@SiO2;catalyst;hydrogenation;nitrobenzene
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PubMed
高影响因子
Alexandria Engineering Journal
·
2020
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IF 2.46
Saifeldin M. Siddeeg,Abdelfattah Amari,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
For the simultaneous removal of water contaminants, a novel nanocomposite has been produced. The iron oxide core with silica shell was used to prepare functional magnetic polymer Fe 3 O 4 /SiO 2 /glycidyl methacrylate (GMA)-S-SH nanocomposite. The sulfur functional nanocomposite is suitable for the immobilization of laccase enzyme. The synthesized nanocomposite was characterized using FT-IR spectroscopy, SEM, TEM, XRD, and magnetometer. The effect of pH, temperature, and storage time over free and immobilized enzyme was studied that indicating the higher stability of immobilized enzyme than that free one. The prepared novel nanocomposite showed high adsorption capacity toward Cd +2 ions in addition to the degradation of meloxicam and piroxicam anti-inflammatory drugs. The removal efficiency reached up to 94% ± 2%, 92% ± 2%, and 95% ± 2% for Cd +2 ions, meloxicam, and piroxicam, respectively at optimum pH and temperature. Also, the results show that this nanocomposite is recyclable. The efficient removal of Cd +2 ions and pharmaceuticals can be reached up to four cycles. We conclude that the prepared nanocomposite is promising for water treatment.
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