CATALYSIS TODAY
·
2018
·
IF 4.667
Luyao Ren,Liangzhong Li,Shuai Chen,Hui Li,Yongdi Liu,Liyang Zhou,Su Guo,YunJiang Yu
In this study, Fe/FeS@SiO 2 yolk-shell particles (Fe/FeS@SiO 2 YSPs) were synthesized, characterized, and applied to tetrabromobisphenol A (TBBPA) removal in simulated groundwater. The X-ray photoelectron spectroscopy, X-ray diffraction, Scanning electron microscopy, transmission electron microscopy and Brunauer Emmett Teller results revealed that Fe/FeS@SiO 2 YSPs possess special structures, including active cores, mesoporous networks, shells, hollow cavities and a large surface area (85 m 2 /g vs. 8 m 2 /g) compared to Fe/FeS. The mobility of the synthesized particles in porous media was simulated with sand column experiments. Fe/FeS@SiO 2 YSPs showed a much better transportability (83.02% of particles successfully transported through the column) than Fe/FeS particles (only 1.68%), related to the better suspension stability and much lower particle surface charge (−22.7 mV vs. −7.6 mV) at neutral pH. Improved TBBPA reduction performance in synthetic solution was observed for Fe/FeS@SiO 2 YSPs over bare Fe/FeS. The transformation pathway of TBBPA was studied in detail, revealing the formation of tri-BBPA, di-BBPA, mono-BBPA and BPA as the main products. In brief, thanks to the hollow mesoporous silica spheres (HMSS) coated on the surface of Fe/FeS particles, Fe/FeS@SiO 2 YSPs showed an enhanced dispersibility, transportability and degradation of TBBPA in simulated groundwater. The results in this study proved that Fe/FeS@SiO 2 YSPs are a promising material for in situ remediation of TBBPA in soil and groundwater.
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
ENERGY
·
2023
·
IF 9
Run Qi,Zhaohao Li,Hongyuan Zhang,Hongming Fu,Heng Zhang,Dan Gao,Haiping Chen
Membrane absorption is a promising CO 2 capture technology, which is limited by the high cost of membrane materials. Coal fly ash (CFA)-based ceramic membrane as an alternative material for membrane modules can effectively reduce the preparation cost. In this study, CFA-based ceramic membrane with superhydrophobic properties is prepared by depositing SiO 2 nanoparticles and grafting 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS). Characters including pore size distribution, porosity and N 2 flux of superhydrophobic membrane are performed. The superhydrophobic modified ceramic membrane is applied to CO 2 capture experiments using ethanolamine (MEA) solution as the absorbent. The result shows that the contact angle of the modified ceramic membrane reaches 155.0°, which significantly improves the anti-wetting properties of the membrane surface . The CO 2 capture experiment demonstrates a maximum capture efficiency of 97.45% and a mass transfer rate of 21.17 mol/(m 2 ·h). In addition, the superhydrophobic modified ceramic membrane exhibits excellent thermal and chemical stability, sustaining high performance even after 8 h of continuous operation. This study provides the theoretical and empirical foundation for the application of CFA-based superhydrophobic ceramic membranes in CO 2 capture.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Weizhou Li,Quanzhi Chen,Deli Shen,Ruixia Yang,Xiuhai Zhang
In order to decrease defects and improve protective performance, micro-arc oxidation (MAO) coating was modified by adding SiO 2 particles to form a composite coating on TA2 alloy via laser treatment. The microstructural morphology, phase structure, cohesive strength and corrosion resistance of the composite coatings were investigated and analyzed by using SEM, XRD , thermal cycle, and electrochemical testing, respectively. The results showed that SiO 2 particles were firstly adsorbed onto the MAO surface with the aid of ultrasonic treatment and then sealed micro-pores of the MAO coating after laser treatment. The composite coating mainly consisted of R-TiO 2 , A-TiO 2 and SiO 2 phases and exhibited a dense multilayer structure with a rich Si element in the outer layer. After subjecting the coatings to 300 thermal cycles, clacking or marked spalling zones could not be observed in the composite coating; nevertheless, an obvious destruction appeared in the single MAO coating without SiO 2 particles. The corrosion potential ( E corr ) and pitting potentials ( E pit ) of the composite coating were −0.303 V and 1.765 V compared to that of −0.682 V and 1.401 V for the single MAO coating. Additionally, the corrosion rate decreased to 1.40 × 10 −4 A·cm −2 with the highest resistance (76,788.67 Ω·cm 2 ) from2.19 × 10 −4 A·cm −2 , indicating a stronger corrosion resistance in the composite coating. The results of simulation from Comsol Multiphysics demonstrated that a laser power as 80 W was appropriate for melting SiO 2 particles into the MAO coating to form a dense and cohesive composite coating.
研究领域:
材料科学
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表面工程
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腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
SURFACE ENGINEERING
·
2019
·
IF 2.229
J. P. Lu,L. Chen,R. G. Song
The surfaces of SiO2 ultra-fine particles with different sizes have been modified by γ-(2, 3-epoxypropoxy)propytrimethoxysilane (KH-560) silane coupling agent. Then the homogeneous fluoropolymer/SiO2 composite coatings have been successfully prepared on mild steel substrates. The surface grafting of KH-560 on SiO2 particles was detected by means of Fourier transform infrared spectroscopy, thermo gravimetric analysis and transmission electron microscopy. The surface morphologies and corrosion resistance of fluoropolymer/SiO2 composite coatings were characterised by field emission scanning electron microscopy, potentiodynamic polarisation as well as electrochemical impedance. The results showed that KH-560-modified SiO2 particles can decrease agglomeration effectively, and the particles play a beneficial role in improving the corrosion resistance of the coated steel significantly. There exists an obvious effect of SiO2 particles size on the corrosion resistance of fluoropolymer/SiO2 composite coatings. Also, the SiO2 particles with diameter of 150 nm are of the best effect among all particle sizes.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 75
·47738-47745
·
IF 3.108
Kunquan Li,Xingrong Zeng,Xuejun Lai,Shengyong Chai
Fluorine-containing acrylates (FACs) with different glass transition temperature (Tg) were synthesized by solution copolymerization, and then the superhydrophobic coatings were fabricated based on the FAC, micro-SiO2 (M-SiO2) and nano-SiO2 (N-SiO2) particles through a two-step spray method. The prepared FAC was characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H-NMR) and differential scanning calorimetry (DSC). The wetting behavior and surface morphology of the superhydrophobic coating were studied. The resistance and mechanism of the superhydrophobic coating against abrasion were also investigated. FTIR and 1H-NMR showed that the fluorinated-containing monomer had copolymerized with the acrylate monomers, and FACs with different Tg of about 74.2 °C, 24.5 °C, −7.7 °C and −29.5 °C were prepared. After coating with FAC/M-SiO2/N-SiO2 composite coating, the surface showed hierarchical structures with a roughness (Sa) of 1.23 mm, and became superhydrophobic with a water contact angle higher than 150° and a low sliding angle lower than 5°. Abrasion testing showed that the superhydrophobic coating fabricated based on the FAC polymer with low Tg had better abrasion resistance in comparison with that of the FAC polymer with high Tg. Meanwhile, the M-SiO2 in the composite coating could weaken the abrasion force to the surface micro roughness damage and acted as connections for the adhesion of N-SiO2 particles during abrasion, which ensured the binary micro/nano structures required for good hydrophobicity after abrasion.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 1
·498-506
·
IF 3.049
Wei Wang,Ang Zheng,Yifan Jiang,Dongsheng Lan,Fenghua Lu,Lelin Zheng,Lin Zhuang,Ruijiang Hong
Monodisperse colloidal particles have promising applications in electrophoretic displays with vivid colors, reversibility and low switching times. In this study, a facile, effective and large-scale strategy for preparing size-controlled Fe3O4@SiO2 particles is reported. Multiple Fe3O4 particles were synthesized by a modified solvothermal method using sodium citrate as a surface modifier with a binary solvent, and were then coated with a SiO2 layer to obtain a highly negatively charged surface via a modified Stöber method. Owing to the easily controlled sizes and sufficient surface charges, Fe3O4@SiO2 particles can be assembled into colloidal amorphous arrays with the balance of electrostatic repulsion and electrophoretic forces. The reflections cover wavelengths ranging from 802 to 453 nm, and were optimized by investigating the dependence of the particles on variables such as particle size, particle volume fraction, and electric field intensity. The large-scale preparation of electrically responsive Fe3O4@SiO2 particles facilitates an electrophoretic display with broad-range colors, showing the practical potential in industrial application.
研究领域:
材料科学
·
纳米技术
·
显示技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 6
·065309
·
IF 1.929
Ran Zhou,Haihong Ma,Zhengfa Zhou,Weibing Xu,Fengmei Ren,Chunhui Li
SiO2 particles were modified by γ-aminopropyltriethoxy silane (KH550) and γ-(2,3-epoxypropoxy)propyltrimethoxy silane (KH560) in sequence to prepare SiO2 particles with silicone-methoxy groups on surface (SiO2-s-Si(OCH3)3). X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis (TGA) were used to characterize the modified SiO2 particles. The SiO2-s-Si(OCH3)3 particles and tetramethoxysilane were used to co-cure hydroxyl silicone oil. The strong interfacial interactions between silicone rubber and fillers, which came from hydrolyzed SiO2-s-Si(OCH3)3 particles in situ reacting with hydroxyl silicone oil, had a great effect on the properties of composites. The mechanical properties, thermal conductivity, dielectric strength and volume resistivity of SiO2-s-Si(OCH3)3/silicone rubber composites were considerably higher than that of pristine SiO2/silicone rubber composites at the same content of SiO2, while the dielectric constant and dielectric loss tangent of SiO2-s-Si(OCH3)3/silicone rubber composites was lower than that of pristine SiO2/silicone rubber composites at the same content of SiO2.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Liujun Song,Jin Hu,Xiaofeng Huang,Li Zhong,Yongbing Pei,Lianbin Wu,Xinya Zhang
Inspired by the compound eye superhydrophobic phenomenon, the hemispherical particles with a concave (HPCs) were prepared and self-assembled into a similar array structure. To improve the roughness and mechanical durability properties, the nanoscale Fe2O3 nanorods modified by 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FSA) were coated on the particles (HPC@Fe2O3) and then the SiO2 particles modified by FSA were deposited onto HPC@Fe2O3 arrays to mimic the nanoscale nipples of a compound eye. The obtained arrays show excellent superhydrophobic properties (the contact angle is 175°, and the sliding angle is 3.5°), which are mainly attributed to the stable micro/nanoscale air-cushion structure’s greatly reduced contact of water drops. After that, the self-healable poly(dimethylsiloxane) (NH2-PDMS) elastomer was introduced as a substrate, and the composite structure can be self-healed in 2 min at room temperature after being damaged, which greatly enhances the lifespan of the superhydrophobic film. This kind of biomimicry material combining the superhydrophobic with the self-healable property has promising applications in artificial skins, wearable devices, and so on.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
CATALYSIS TODAY
·
2025
·
IF 5.3
Jianbo Wang,Jianteng Yan,Qingyan Cui,Tiesen Li,Jie Shi,Tinghai Wang,Yuanyuan Yue,Xiaojun Bao
In order to gain insight into the influence of SiO 2 support particle size on the vacuum residue (VR) slurry-phase hydrocracking performance of Fe-based catalysts, a series of FeZn/SiO 2 catalysts with varying SiO 2 particle sizes were prepared. Characterization results show that the surface area and pore volume of the FeZn/SiO 2 catalysts increase with the reduction of SiO 2 particle sizes. The metals Fe and Zn species on FeZn/SiO 2 -S catalyst are more readily reducible via H 2 -TPR analysis. Notably, FeZn/SiO 2 -S catalyst presents higher metal dispersion and a greater degree of sulfurization compared to the other catalysts by XRD and XPS characterizations. Hydrocracking results demonstrate that the FeZn/SiO 2 -S catalyst achieves the lowest coke and gas yields (11.9 wt% and 0.4 wt%), respectively, and the highest VR conversion among these catalysts. The superior performance of the FeZn/SiO 2 -S catalyst in VR slurry-phase hydrocracking is ascribed to its enhanced hydrogenation activity, deriving from the higher dispersion and sulfurization of metals species. This suppressed the aggregation of polycyclic aromatic hydrocarbons in VR and the over-cracking of intermediate products. Additionally, the increased mesopore associated with smaller SiO 2 particles facilitates to the diffusion of large VR molecules, further promoting the hydrocracking reaction.
研究领域:
化学工程
·
催化材料
✓ 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）