INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Qibin Xu,Lei Wang,Chen Li,Xudong Wang,Cuicui Li,Yatian Geng
In order to improve the proton conductivity and anti-fouling of proton exchange membrane (PEM) in microbial fuel cells , the present study prepares a novel composite proton exchange membrane. First, silicon dioxide (SiO 2 ) is inserted into sulfonated graphene oxide (SGO) by in situ hydrolysis using ethyl orthosilicate as precursor. Then, the obtained SGO@SiO 2 is blended with homopolymer poly(-vinylidene fluoride) grafted sodium styrene sulfonate (PVDF-g-PSSA). The effects of particles on the physicochemical properties and anti-fouling properties of the composite membrane are investigated. The best performance is obtained when the addition of SGO@SiO 2 is 1.0%. The ion exchange capacity reaches 1.6 meq/g and the proton conductivity is 0.078 S/cm, which is higher than Nafion-117 membrane. The anti-fouling ability of composite membrane gets stronger based on the quartz crystal microbalance with dissipation (QCM-D) result. The power density of microbial fuel cell with SGO@SiO 2 /PVDF-g-PSSA membrane is 185 mW/m 2 after operating one month, which is superior to SGO/PVDF-g-PSSA and PVDF-g-PSSA membrane. The improvement shows that SGO@SiO 2 /PVDF-g-PSSA membrane could be a feasible alternative to costly membrane and have potential for application in microbial fuel cell.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Junsong Fu,Mengjie Zhang,Lin Jin,Liu Liu,Na Li,Lei Shang,Ming Li,Linghan Xiao,Yuhui Ao
To enhance the interfacial properties of carbon fibers (CFs) reinforced epoxy composites without sacrificing fiber strength. A facile and effective Layer-by-Layer (LbL) self assembly method was proposed to deposit graphene oxide/silica (GO/SiO 2 ) multilayers films onto CFs surface. The negatively charged GO and positively charged SiO 2 can be assembled on the surface of fiber based on electrostatic interactions. Surface microstructures of CFs were characterized systematically. Scanning electron microscopy (SEM) revealed the GO/SiO 2 multilayers films compact and homogeneous coverage onto CFs surface. This coverage significantly increases the roughness and surface energy of the fibers, improving the wettability and mechanical interlocking between fibers and resin. The optimal interfacial shear strength (IFSS) of composites with 5 layers (CF-L5) was 84.40 MPa, which increased by 86.1% compared to that of Untreated-CF composites (45.36 MPa), and the interlaminar shear strength (ILSS) of CF-L5 composites (76.34 MPa) increased by 89.3% compared to that of Untreated-CF composites (40.33 MPa). In addition, the flexural strength of CF-L5 composites (765.57 MPa) was 30.4% higher than that of Untreated-CF composites (587.19 MPa). The fractured surface, energy dispersive spectroscopy (EDS) mapping and dynamic mechanical properties of CFs composites also show a great improvement in interfacial adhesion. Moreover, the tensile strength (TS) of single fiber increased from 3.52 GPa to 3.68 GPa after LbL assembly of GO/SiO 2 . Our work suggested that such LbL self assembly is a green and promising approach toward preparing high interfacial properties in CFs composites.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Jun Zhang,Chaowei Li,Cuiping Yu,Xiaona Wang,Qiulong Li,Huifen Lu,Qichong Zhang,Jingxin Zhao,E. Songfeng,Ming Hu,Yagang Yao
The interface plays a key role in determining the properties of polymer composites . However, chemical inertness of hexagonal boron nitride (h-BN) makes its surface modification troublesome. In this study, we, for the first time, used SiO 2 as the modified molecular and investigated the effects of exfoliated h-BN and SiO 2 nanoparticles-modified-exfoliated h-BN (SiO 2 @exfoliated h-BN) on the storage modulus , the glass transition temperature , the filler dispersion and the thermal conductivity of polyvinyl alcohol (PVA) composites prepared by a solution mixture method. The results showed that the SiO 2 modification enhanced the interface interaction and improved the performance of the PVA composites. Based on the enhanced interface interaction by SiO 2 modification and the aligned fillers in PVA by vacuum filtration, the high thermal conductivity of 13.88 W/m·K was realized at 15.2 wt% SiO 2 @exfoliated h-BN loading. Meanwhile, the tensile strength was also largely improved to 156 MPa, compared with 47 MPa of pure PVA. This study broadens the surface modification method of h-BN and provides a valuable reference for fabrication of high-performance thermal interface materials .
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Jing Wang,Na Li,Feng Shao,Heyou Han
Highly luminescent, good stable and low toxic N-acetyl- l -cysteine (NAC) capped CdTe/CdS@ZnS–SiO 2 near-infrared (NIR)-emitting quantum dots (QDs) were successfully fabricated in aqueous solution via a microwave irradiation reduction route, in which thiol-capped CdTe/CdS QDs were employed as core templates and ZnCl 2 , NAC and tetraethyl orthosilicate as shell precursors. This presented ZnS-like clusters filled hybrid SiO 2 model not only greatly improved the brightness and stability of original CdTe/CdS QDs, but also tremendously decreased the cytotoxicity towards HeLa cells. Furthermore, it was found that Hg 2+ could effectively selective quench the QD NIR emission based on electron transfer process. On the basis of this fact, a simple, rapid and specific method for trace Hg 2+ determination was proposed. Under optimal conditions, the fluorescence intensity decreased linearly with the concentration of Hg 2+ ranging from 5.0 × 10 −9 to 1.0 × 10 −6 M and the limit of detection for Hg 2+ was 1.0 × 10 −9 M ( S / N = 3). As practical applications, the novel NIR sensor has been demonstrated to monitor and image Hg 2+ level in milk power and HeLa cells respectively with satisfactory results obtained.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 24
·18850-18857
·
IF 3.84
Huimin Duan,Leilei Li,Xiaojiao Wang,Yanhui Wang,Jianbo Li,Chuannan Luo
A chemiluminescence (CL) sensor with high sensitivity and selectivity has been developed for the determination of Ribonuclease A (RNase A). A new material Fe3O4/multi-walled carbon nanotubes/SiO2 (Fe3O4/MWCNTs/SiO2) was introduced into this sensor as a supporting material to prepare a surface molecular imprinting polymer (SMIP). In this work, Fe3O4 not only served as a backbone material in the preparation of the RNase A SMIP, but also as a separation reagent to allow the easy collection of the SMIP complex. Carbon nanotubes and SiO2 were also used as supporting materials to prepare SMIP for their large specific surface area. The Fe3O4/MWCNTs/SiO2 nanocomposite was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. The adsorption ability of the Fe3O4/MWCNTs/SiO2-SMIP was calculated to be 102 mg g−1, which demonstrated the excellent recognition and adsorption ability of the imprinting cavities situated at or in the proximity of the surface of the Fe3O4/MWCNTs/SiO2. Under optimal conditions, the linear range of the sensor extended from 1.0 × 10−9 mg mL−1 to 1.0 × 10−7 mg mL−1 for RNase A and the detection limit was 3.2 × 10−10 mg mL−1 (3δ). The proposed sensor was successfully applied for the determination of RNase A in biological samples with recoveries from 93% to 105%.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2014
·
IF 3.511
Minqiong Tang,Qing Wang,Ming Jiang,Li Xu,Zhi-Guo Shi,Ting Zhang,Yan Liu
In the present study, magnetic nanoparticles (MNPs) with phenyl functionalized core and a hydrophilic methylcellulose coating were synthesized. The functionalized MNPs showed excellent dispersibility in aqueous solution and they were applied to magnetic solid phase extraction (MSPE) of sildenafil and its metabolite, desmethyl sildenafil, from human urine and plasma samples followed by high performance liquid chromatographic analysis. The factors that may influence the extraction, including the amount of MNPs, pH and salt concentration of sample solution, extraction and desorption time, and the volume of desorption solvent, were investigated in detail. Under the optimum MSPE conditions, the developed method showed satisfactory reproducibility with intra-day and inter-day relative standard deviations less than 8.2% and low limits of detection of 0.41–0.96 ng mL −1 from urine and plasma samples. The proposed material possessed good water compatibility and demonstrated excellent applicability for biological samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 2
·1-11
·
IF 2.101
Du Yingying,Yang Ping,Matras-Postolek Katarzyna,Wang Junpeng,Che Quande,Cao Yongqiang,Ma Qian
A silanization process was employed to transfer hydrophobic quantum dots (QDs) prepared via an organic route at high temperature into water phase. The QDs were further coated with a thin organic SiO 2 shell to form QDs@SiO 2 composite nanoparticles by ligand exchange or remaining initial organic ligands on the surface. In this study, QDs with different ligands, either trioctylphosphine oxide (TOPO) or oleic acid (OA), were employed to investigate the effects of ligands on the reverse micelles in preparing QDs@SiO 2 nanoparticles. In the preparing process, hydrophobic QDs were silanized by partially hydrolyzed tetraethyl orthosilicate (TEOS). For TOPO-capped CdSe QDs, surface TOPO ligands were completely replaced by partially hydrolyzed TEOS. As for OA-capped CdSe/Cd
x
Zn 1− x
S QDs, surface OA ligands were partially replaced. It was found that the ligand exchange drastically reduced the photoluminescence (PL) efficiency of CdSe QDs. Furthermore, the cytotoxicity studies of QDs@SiO 2 have been carried out in detail. The results indicate that CdSe/Cd
x
Zn 1− x
S QDs@SiO 2 composite nanoparticles exhibit lower cytotoxicity compared with CdSe QDs@SiO 2 , because the SiO 2 shell and remained OA ligand layer can effectively prevent the leakage of toxic Cd 2+ ions. Meanwhile, it was found that these CdSe/Cd
x
Zn 1− x
S QDs@SiO 2 nanocomposites could keep excellent PL properties even for 24 h incubating with Siha cells, which indicating that our prepared composite nanoparticles are potentially applicable for cell imaging in biological systems.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Haiyun Zhai,Lu Huang,Zuanguang Chen,Zihao Su,Kaisong Yuan,Guohuan Liang,Yufang Pan
A novel solid-phase extraction chip embedded with array columns of molecularly imprinted polymer-coated silanized graphene oxide (GO/SiO 2 -MISPE) was established to detect trace rhodamine B (RB) in chili powder. GO/SiO 2 -MISPE monolithic columns for RB detection were prepared by optimizing the supporting substrate, template, and polymerizing monomer under mild water bath conditions. Adsorption capacity and specificity, which are critical properties for the application of the GO/SiO 2 -MISPE monolithic column, were investigated. GO/SiO 2 -MIP was examined by scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy. The recovery and the intraday and interday relative standard deviations for RB ranged from 83.7% to 88.4% and 2.5% to 4.0% and the enrichment factors were higher than 110-fold. The chip-based array columns effectively eliminated impurities in chili powder, indicating that the chip-based GO/SiO 2 -MISPE method was reliable for RB detection in food samples using high-performance liquid chromatography. Accordingly, this method has direct applications for monitoring potentially harmful dyes in processed food.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 20
·4032-4040
·
IF 2.557
Qingxiang Zhou,Yongyong Yuan,Yalin Wu,Yongli Liu
A novel magnetic core–shell material polyaniline@SiO 2 @Fe (PANI@SiO 2 @Fe) has been successfully synthesized and investigated as an effective adsorbent for the magnetic solid-phase extraction of typical endocrine disrupting compounds such as bisphenol A, tetrabromobisphenol A, and 4-nonylphenol from water samples. The morphology of the as-prepared PANI@SiO 2 @Fe was characterized by transmission electron microscopy and X-ray diffraction. The main parameters that influenced the enrichment performance such as the kind of eluent, amount of adsorbent, volume of eluent, adsorption time, elution time, ionic strength, pH, concentration of humic acid, and sample volume were investigated. Under the optimal conditions, a good linear relationship was found in the range of 0.05–100 μg/L for bisphenol A, 0.05–300 μg/L for tetrabromobisphenol A, and 0.05–250 μg/L for 4-nonylphenol, respectively. The correlation coefficients are all above 0.995. The limits of detection were in the range of 0.009–0.04 μg/L, and precisions were under 3.73% ( n = 6). The real water analysis indicated that the spiked recoveries were in the range of 92.9–98.9% ( n = 3). All these results indicated that the developed method was an efficient tool for the analysis of bisphenol A, tetrabromobisphenol A, and 4-nonylphenol.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hong Li,Diyun Chen,Weixing Han,Jun He,Gang Song,Lingjun Kong,Minhua Su
Wastewater from uranium mining activities is highly acidic and contains uranium, thereby posing severe risks to the ecological environment and human health. Accordingly, uranium purification is extremely crucial. Herein, we delicately designed a novel adsorbent of diethylenetriaminepenta(methylenephosphonic) acid (DTPMP) and meso -SiO 2 modified γ-Fe 2 O 3 (γ-Fe 2 O 3 @SiO 2 @DTPMP, denoted as FSD), and found that the adsorbent can remarkably boost the removal performance of U(VI) under highly acidic conditions. The removal efficiencies of U(VI) by FSD are 90.26 % and 99.81 % in strong acidic solutions of pH = 1.0 and pH = 2.0, respectively, which are much higher than most of the reported adsorbents. Importantly, FSD exhibits high adsorption capacity (51.45 mg/g) and excellent anti-interference, even the wastewater stream contained a lot of organic substances ( e.g. , fulvic acid), cations ( e.g. , K + , Na + , Mg 2+ , NH 4 + , Zn 2+ , Co 2+ , etc.), radioactive nuclides ( e.g. , Cs + and Sr 2+ ). After five cycles, the adsorption efficiency and desorption efficiency of FSD only reduced by 8.83 % and 9.61 %, respectively, which are mainly attributed to the unique structures and good chemical stability of FSD. The removal of U(VI) by FSD is a heterogeneous adsorption process which is dominated by chemical adsorption, mainly involving surface coordination complexation. Multiwfn wavefunction and VMD programs based on density functional theory (DFT) further analyzed and visualized the interaction sites and relative strengths of reactions. The results of detailed characterization analysis and theoretical calculations confirmed that the highly efficient U(VI) removal by FSD is mainly ascribed to the strong coordination of the phosphate groups and amino nitrogen atoms in DTPMP with UO 2 2+ . Therefore, this study provides a promising strategy for the removal of U(VI) in strongly acidic wastewater.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Lin Qiao,Dong Fu
N-doped carbon-silicon composite adsorbent (NC@SiO 2 ) has garnered significant attention in the field of CO 2 capture. In this study, a novel NC@SiO 2 has been developed by combining hydrothermal synthesis, Stober method, and one-step carbonization activation. It exhibits a moderate static adsorption capacity (3 mmol/g, 298.15 K) , along with low adsorption heat (14.65–21.93 KJ/mol). At 313.15 K, the dynamic adsorption capacity and adsorption rate for CO 2 (volCO 2 : volN 2 = 15 %:85 %) are 2 mmol/g and 0.202 mmol/g/min, respectively. Additionally, it demonstrates excellent cycle stability, with the adsorption capacity decreasing by only 7 % after 10 cycles. Density Functional Theory (DFT) calculations confirm that the presence of functional groups of N and O significantly enhances CO 2 adsorption performance of NC@SiO 2 . The synergistic effect of SiO 2 coating, N doping, and K 2 CO 3 activation is important for improving CO 2 dynamic adsorption performance, positioning NC@SiO 2 as a promising candidate for capturing CO 2 from flue gas.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Shurong Shi,Lihua Gao,Junhong Zhang,Zhijun He
A systematic study of the preparation and metallurgical properties of magnesia flux pellets was used to elucidate the mechanism for oxidation and consolidation occurring during oxidative roasting. The compressive strength of the finished pellets was 3545 N/P. With sufficient basicity and MgO contents, magnetite (Fe) x [Fe] 2 O 4 and maghemite γ-Fe 2 O 3 with spinel-type crystal structures combined with MgO/CaO to form nonstoichiometric Mg x Fe 1-x Fe 2 O 4 (0 < x < 1) and Ca y Fe 1-y Fe 2 O 4 (0 < y < 1). With higher basicity and MgO contents, the participation of CaO/MgO was the driving force for gradient conversion from olivine Fe 2 SiO 4 to olivine Mg x Ca 2-x SiO 4 . The CaO/MgO combined with magnetite (Fe) x [Fe] 2 O 4 and maghemite γ-Fe 2 O 3 to form stable (Ca, Mg) x Fe 1-x Fe 2 O 4 , CaFe 2 O 4 and CaFe 3 O 5 , thereby inhibiting recrystallization of the pellets and resulting in poorer metallurgical properties of the magnesia flux pellets.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）