Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Xiunan Cai,Qingwen Huang,Zongxian Hong,Yanjuan Zhang,Huayu Hu,Zuqiang Huang,Jing Liang,Yuben Qin
To harmlessly treat and effectively utilize manganese residue (MR), a novel MR-based catalyst, mechanical activation (MA)-pretreated MR-derived Fe-Cu@SiO 2 /starch-derived carbon (MAMR-Fe-Cu@SiO 2 /SC) composite, was prepared through a facial method by reduction roasting of MA-pretreated precursors. The prepared catalysts were systematically characterized to explore the formation and catalytic activities. The results showed that the formation of CuFeO 2 anchored on the MR could be ascribed to the close contact and mutual diffusion between solid components caused by MA, and the higher specific surface area, strong interaction of Fe-Cu and more accessible reactive sites of MAMR-Fe-Cu@SiO 2 /SC contributed to the greater catalytic activity in photo-Fenton system for tetracycline (TC) degradation. The MAMR-Fe-Cu@SiO 2 /SC catalyst showed excellent degradation efficiency at pH range of 2.5–9.5, and about 100% TC removal in 40 min and 85.6% TOC removal in 120 min could be obtained. The MAMR-Fe-Cu@SiO 2 /SC exhibited the highest apparent reaction rate constant of 0.066 min –1 , being about 4.0, 2.8, and 2.2 times that for the catalyst of Cu/SC, MAMR-Fe 3 O 4 @SiO 2 /SC and MR-Fe-Cu@SiO 2 /SC, respectively. This enhancement could be attributed to that anchored Cu could accelerate the charge transfer, and short the reaction pathway between photo and Fenton reaction. XPS results showed that the presence of Fe 2+ -Fe 3+ , Mn 2+ -Mn 3+ and Cu + -Cu 2+ cycles were responsible for the radical generation on the surface of the catalyst. This environmentally-friendly method for the preparation of composite catalysts may provide new insights for harmless fixed treatment and valorization of MR and large-scale production of catalyst.
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高影响因子
Polymers
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2020
·Vol. 12
·期 12
·3008
·
IF 3.426
Menghui Wan,Haodong Zhao,Lichao Peng,Xueyan Zou,Yanbao Zhao,Lei Sun
In this paper, we propose a facile and cost-effective electrospinning technique to fabricate surface-enhanced Raman scattering (SERS) substrates, which is appropriate for multiple analytes detection. First of all, HAuCl4∙3H2O was added into the TEOS/PVP precursor solution, and flexible SiO2nanofibers incorporated with gold nanoparticles (SiO2@Au) were prepared by electrospinning and calcination. Subsequently, the nanofibrous membranes were immersed in the tannic acid and 3-aminopropyltriethoxysilane solution for surface modification through Michael addition reaction. Finally, the composite nanofibers (Ag@T-A@SiO2@Au) were obtained by the in-situ growth of Ag nanoparticles on the surfaces of nanofibers with tannic acid as a reducing agent. Due to the synergistic enhancement of Au and Ag nanoparticles, the flexible and self-supporting composite nanofibrous membranes have excellent SERS properties. Serving as SERS substrates, they are extremely sensitive to the detection of 4-mercaptophenol and 4-mercaptobenzoic acid, with an enhancement factor of 108. Moreover, they could be utilized to detect analytes such as pesticide thiram at a low concentration of 10−8mol/L, and the substrates retain excellent Raman signals stability during the durability test of 60 days. Furthermore, the as-fabricated substrates, as a versatile SERS platform, could be used to detect bacteria ofStaphylococcus aureuswithout a specific and complicated bacteria-aptamer conjugation procedure, and the detection limit is up to 103colony forming units/mL. Meanwhile, the substrates also show an excellent repeatability of SERS response forS. aureusorganelles. Briefly, the prime novelty of this work is the fabrication of Au/Ag bimetallic synergetic enhancement substrates as SERS platform for versatile detection with high sensitivity and stability.Keywords:Ag/Au nanoparticles;synergetic enhancement;electrospun nanofibers;SERS substrates;versatile detection
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Xuelin Fan,Jia-Tao Miao,Li Yuan,Qingbao Guan,Aijuan Gu,Guozheng Liang
Big internal stress and poor UV resistance are two bottlenecks of epoxy resins for light emitting diode (LED) encapsulation, and how to solve them with a green method is still a great challenge. Herein, a unique hybrid was synthesized by forming SiO 2 particles on surface of cellulose, the hybridized cellulose (mCNC@SiO 2 ) was then used to develop new high performance epoxy resin (mCNC@SiO 2 /EP) for LED encapsulation. The effect of the content of mCNC@SiO 2 on the comprehensive performances of mCNC@SiO 2 /EP resins was studied. Results show that the presence of mCNC@SiO 2 not only greatly reduces the internal stress and improves UV resistance, but also increases moisture resistance while maintaining high heat resistance. When the content of mCNC@SiO 2 is only 2.0 wt%, the internal stress is reduced by 62%, thanking to the significant decrease in thermal expansion coefficient, and curing stress derived from the flexibility of Si-O-Si segment in mCNC@SiO 2 . In addition, mCNC@SiO 2 /EP resin has good transmittance, proving that the presence of mCNC@SiO 2 can effectively alleviate yellowing and improve UV resistance. These excellent comprehensive properties of mCNC@SiO 2 /EP resin demonstrate that mCNC@SiO 2 is a green and multifunctional modifier of epoxy resin for high performance LED encapsulation.
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 11
·8111-8120
·
IF 4.6
Hao Zhang,Weihao Ma,Chunyu Qiang,Jiayuan Nie,Ling Ma,Yawei Zhang,Ke Wang
In our research, an emerging magnetic covalent organic framework (Fe3O4@SiO2–BD–DADB-COF) was formulated through Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), etc. Several parameters affecting the extraction process were refined. Accordingly, a novel method of determining 15 macrolides (MALs) in honey and water was established through the Fe3O4@SiO2–BD–DADB-COF as a magnetic solid-phase extraction (MSPE) adsorbent and ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). In consequence, the standard curves for the 15 MALs exhibited an exceptional linearity from 0.1 to 200 μg L−1, and the correlation coefficients (R2) varied from 0.9990 to 0.9999. The recoveries fell between 70.01% and 115.56%, with the relative standard deviations (RSDs) being below 9.93% (n = 5). The detection limits reached 0.001–0.075 μg L−1 with the quantification limits being 0.004–0.228 μg L−1. Ultimately, the method was excellently applied to the analysis of MALs in honey and water.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Yan Qiao,Menglin Wang,Erling Guo,Ke Wang,Ling Ma,Kaoqi Lian
This study aimed to design and synthesize a novel adsorbent Fe 3 O 4 @SiO 2 @MPA-TAPA-COF material for the first time and used as an adsorbent of MSPE. It had significant potential for the pretreatment of trace analytes. The MSPE was coupled with ultra performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS) for the rapid extraction and detection of 12 sulfonamides (SAs) from water and milk samples for the first time. Several experimental parameters were optimized, including adsorbent dosage and the effects of pH, ionic strength, adsorption time, and desorption conditions. Under the optimized pretreatment and instrumental conditions, good linearity of 0.1–100 μg·L −1 with a correlation coefficient 0.9994–0.9999, low limits of detection (0.004–0.044 μg·L −1 ) and limits of quantitation (0.013–0.136 μg·L −1 ) were obtained. Moreover, the recoveries of sulfonamides in water and milk samples were in the range of 60.88 %-102.94 %, and the relative standard deviations not exceeding 9.62 %. Finally, the magnetic Fe 3 O 4 @SiO 2 @MPA-TAPA-COF material possessed the magnetic separation and high adsorption affinity for extracting SAs from real samples. This study holds great significance in enhancing the monitoring of SAs drug residues in water and milk.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Han Jia,Daofan Wang,Fengbin Lv,Qiang Wang,Li Lv,Xin Wei,Lin Song,Haidong Jia,Kaihe Lv,Dexin Liu
Both negatively charged SiO 2 nanoparticle and positively charged AlOOH nanoparticle have been widely used in various fields, including enhanced oil recovery (EOR). In this study, the mixed binary AlOOH/SiO 2 nanoparticle (MBN) systems are constructed and firstly employed in EOR. The measurements of zeta potential and Z-average diameter indicate that the stable MBN aqueous dispersion could be obtained by controlling AlOOH/SiO 2 mass ratios, which is quantificationally confirmed via the e-DLVO theory. Then the ternary TX-100-AlOOH-SiO 2 (TX-A-S) system exhibits the great ability to stabilize the emulsion at the much low nanoparticle concentration (0.15 wt% in total). The emulsion stability is further evaluated in the harsh conditions (high shear, temperature and electrolyte concentration). Moreover, core flooding and microscopic visualization experiments reflect the TX-A-S stabilized emulsion can dramatically enhance tertiary oil recovery (~23% of initial oil in place), which should be attributed to the high improvement of both displacement and sweep efficiency.
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高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 5
·1069-1077
·
IF 1.915
Anlin Peng,Yuting Wang,Jing Xiao,Shi Wang,Hong Ding
Aminophylline is a drug that needs therapeutic drug monitoring in clinical treatment. A novel disposable screen-printed electrode (SPE) modified with MWNTs-SiO2/Au composites for the determination of aminophylline concentration in blood samples was developed. The electrochemical performance of aminophylline at the MWNTs-SiO2/Au SPE was explored by cyclic voltammetry (CV) and square wave voltammetry (SWV). The optimum experimental conditions were obtained and the currents of aminophylline presented a good linear property with the increasing of the concentrations under optimized conditions. The linear range of aminophylline was from 5 μM to 200 μM with a detection limit of 0.5 μM (S/N = 3). The results of clinical blood samples showed good sensitivity and selectivity of the prepared sensor. Moreover, the drug concentration-time curve of aminophylline in clinical patients was attained at different time points such as 0.5 h, 1 h, and 2 h by the proposed method. The results strongly suggested that the established sensor could be used for practical monitoring in clinical individualized treatment.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Rong Wo,Qiu-Lin Li,Chao Zhu,Yan Zhang,Ge-fei Qiao,Kai-yu Lei,Ping Du,Wei Jiang
In this work, a novel core@double-shell three-layer structure adsorbent (Fe3O4@SiO2@Zn–TDPAT) [TDPAT = 2,4,6-tris(3,5-dicarboxyl phenylamino)-1,3,5-triazine] was prepared to remove congo red (CR) and methylene blue (MB). The as-obtained magnetic adsorbent Fe3O4@SiO2@Zn–TDPAT was characterized by X-ray diffraction, Fourier transform infrared spectra, vibrating sample magnetometry, transmission electron microscopy, and scanning electron microscopy. The influencing adsorption parameters including adsorbent amounts, extraction time, pH, and ionic strength were investigated. Under the optimized conditions, the removal efficiencies of CR and MB reached 100 and 99%, respectively. The pseudo-second-order kinetic model and Langmuir model were suitable to illustrate the adsorption processes of CR and MB. The thermodynamic values, including Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°), showed that the adsorption processes were spontaneous and endothermic in nature. Moreover, the obtained nanocomposite remained stable in different acid–alkaline solutions and exhibited good reusability after multiple cycles. All of the experimental results indicated that Fe3O4@SiO2@Zn–TDPAT could be a potential adsorbent to purify dye wastewater.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 6
·2142-2154
·
IF 6.641
Zhiyuan Yang,Hongmei Liu,Yiran Tian,Ying Chen,Zhiqiang Niu,Canliang Zhou,Fuyan Wang,Chenjie Gu,Shiwei Tang,Tao Jiang,Jun Zhou
In the field of surface-enhanced Raman scattering (SERS)-based immunoassays utilizing a sandwich structure, one of the main barriers to overcome is the development of an immunoprobe and substrate with ultrahigh sensitivity and relatively good reproducibility. In this work, a novel gold (Au)-coated “stellate” mesoporous SiO2 (SMSiO2) hybrid structure was proposed and applied as an immunoprobe. It was noticed that the SMSiO2 matrix with an appropriate coating amount of Au nanoparticles (NPs) demonstrated a much higher SERS intensity than solid SiO2 (SSiO2)@Au NPs with an enhancement ratio of 2.6. Electromagnetic “hot spots” existed around the sharp edges and ultrasmall nanogaps of the multibranched SiO2 matrix were verified to be the main reason responsible for the conspicuous enhancement given by the simulation results. Meanwhile, a hydrophilic–hydrophobic SERS-active immunosubstrate was prepared by linking antibodies onto the hydrophilic Ag-deposited sandpaper assembled with hydrophobic-treated filter paper. Such a novel substrate maintained excellent SERS homogeneity with quite a low relative standard deviation (RSD) of 12.85% arising from the elimination of the coffee-ring effect. The constructed sandwich immunoassay structure using the developed immunoprobe and the substrate was successfully employed in a specific assay for the ferritin (FER) antigen and exhibited an extensive dynamic linear range from 1 × 10−5 to 3 × 10−13 g mL−1 with an ultralow limit of detection (LOD) of 3.16 × 10−14 g mL−1. The simplicity and versatility of this strategy demonstrated its superior sensitivity for tumor markers and it can be expected to have potential practical application in the clinical diagnoses of cancer.
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高影响因子
RSC Advances
·
2015
·Vol. 6
·期 7
·5621-5630
·
IF 3.84
Zheng Su,Hua Wang,Fei Xu,Konghu Tian,Jingwei Wu,Xingyou Tian
We report a simple and environmentally friendly approach for preparing a homogeneous dispersion of poly(2-ethylhexyl acrylate)–silicon dioxide (P2EHA–SiO2) composites by self-assembly of negatively charged P2EHA and charged SiO2. The P2EHA latex particles were prepared by miniemulsion polymerization using a free-radical initiator. As auxiliary monomer, acrylic acid created the positive charges on the surface of the P2EHA latex. By mixing P2EHA latex particles with positively charged SiO2 (pSiO2) particles, negatively charged P2EHA latex particles easily assembled with pSiO2 particles through electrostatic interactions. The presence of P2EHA latex particles assisted the homogeneous dispersion of pSiO2 particles in the polymer matrix. After film formation process, the film exhibited excellent thermal-tolerance and adhesive properties. A three-component system of P2EHA latex particles, pSiO2, and negatively charged SiO2 (nSiO2) was also achieved successfully due to the mutual assistance effect. A better thermal-tolerance and adhesive properties were obtained. Through the establishment of the film formation mechanism, we found that the architecture of the composite film has a significant influence on thermal-tolerance and adhesive properties. This composite material has great application potential as a PSA (pressure sensitive adhesive). Our research demonstrates an excellent composite system and provides a convenient approach to realize a wide range of multifunctional fillers, compatible with processing on flexible polymer substrates.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
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IF 3.535
Jing Zhou,Ning Gan,Tianhua Li,Hankun Zhou,Xing Li,Yuting Cao,Lihong Wang,Weiguo Sang,Futao Hu
An ultra-sensitive multiplexed signal amplified piezoelectric immunosensor for the detection of C-reactive protein (CRP) in serum was developed. Firstly, a sandwich-type immunoreaction was made between the capture probe [silicon dioxide-coated magnetic Fe 3 O 4 nanoparticles (MNPs) labeled with the primary CRP antibody (MNPs-CRP Ab1)], CRP (different concentrations), and signal tag [horseradish peroxidase (HRP) coupled with the HRP linked secondary CRP antibody co-immobilized on gold nanoparticles (AuNPs-HRP/HRP-CRP Ab2)]. The immunocomplex was subsequently exposed to 3-amino-9-ethylcarbazole (AEC) and hydrogen peroxide. MNPs-CRP Ab1 capture probe could not only improve the CRP enrichment to amplify the signal through magnetic separation, but also be readily immobilized on the electrode by an external magnet to prepare the sensor. The signal tag could immobilize vast HRP, which could catalyze and yield more AEC's insoluble oxidation product on piezoelectric crystal surface, also resulting in the amplified change in frequency response (Δ f = f − f 0 ). Thus the multiplex signal amplification was achieved. The Δ f was proportional to CRP concentration from 0.001 to 100 ng mL −1 with a low detection limit of 0.3 pg mL −1 . The optimum conditions were studied in detail. The proposed method could provide a fast, simple, and sensitive way for the clinical analysis of ultratrace CRP in heart diseases.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74548-74556
·
IF 3.84
Jianfeng Fei,Wenchao Dou,Guangying Zhao
A rapid and highly sensitive sandwich electrochemical immunoassay method was constructed for Salmonella pullorum and Salmonella gallinarum (S. pullorum and S. gallinarum) determination based on immune magnetic beads (MBs) and an enzyme labeled antibody. An abundance of gold nanoparticles (AuNPs) were attached to SiO2 coated Fe3O4 nanoparticles (Fe3O4/SiO2) via covalent binding between the –SH groups of Fe3O4/SiO2 and the AuNPs. Antibodies against S. pullorum and S. gallinarum were immobilized on Fe3O4/SiO2/AuNPs nanocomposites (AuMNPs) by automatic adsorption between thiol and the AuNPs. S. pullorum and S. gallinarum in the sample were captured by the AuMNPs and separated from the samples by applying an external magnetic field. The AuMNPs–Salmonella complexes (Ag/Ab1/AuMNPs) were re-dispersed in a buffer solution then exposed to horseradish peroxidase labeled anti-S. pullorum and S. gallinarum (HRP-Ab2) solution, forming a sandwich-type immune complex (HRP-Ab2/Ag/Ab1/AuMNPs). A 4 channel screen printed carbon electrode (4-SPCE) was modified by gold nanoparticles (AuNPs) through the electrodeposition method to prepare AuNPs/4-SPCE. After magnetically separating the sandwich immune complexes from solution, HRP-Ab2/Ag/Ab1/AuMNPs was anchored on AuNPs/4-SPCE by a magnet. A linear response to S. pullorum and S. gallinarum was obtained in the concentration range from 102 to 106 CFU mL−1, with a limit of detection of 3.2 × 101 CFU mL−1 (at an SNR of 3). This nanoparticle-based immunoassay method offers sensitive, highly specific, and reproducible detection of S. pullorum and S. gallinarum. Given its low detection limit, it represents promising potential in the detection of other food-borne pathogens by exchanging the antibody.
研究领域:
生物传感器
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食品安全
·
电分析化学
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纳米生物技术
·
微生物检测
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高影响因子
危险品化学品经营许可证（带存储）