FUEL
·
2024
·
IF 6.7
Fengyu Tian,Guangzheng Sun,Xianfu Zeng,Shuwen Xie,Yidi Wang,Zifan Wu,Bin Liu,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
Supported and bulk phase catalysts are both extensively used in hydrogenation reactions, possess distinct strengths and limitations. Aiming to create a catalyst that combines the benefits of both, a series of NiMoW/SiO 2 catalysts were synthesized with varied metal loadings using SiO 2 supports characterized by different pore structures. The catalytic activities of these catalysts were evaluated using 1-methylnaphthalene, dibenzothiophene and quinoline as model compounds. Comprehensive microstructural characterization was performed through ICP-OES, N 2 physisorption, HRTEM, SEM, and XPS techniques. The investigation revealed that both the catalytic and microstructural properties of the catalysts gradually changed from the supported catalysts to the bulk catalysts with the gradual increase of the metal loadings. This transition was accompanied by a significant enhancement in activity and hydrogenation selectivity compare to the supported catalysts. Nonetheless, this catalyst preserved the benefits of a superior pore structure, straightforward preparation methods and excellent regeneration.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yalong Liu,Binjie Xin,Md All Amin Newton,Lifeng Li,Dan Huang
Oil pollution poses severe threats to both ecosystems and human health. This study utilized electrospinning and carbonization processes to fabricate a SiO2-TiO2-C nanofiber membrane (STCNFM) exhibiting photocatalytic self-cleaning properties designed explicitly for oil-water separation. These membranes possess nanoscale rough structures, endowing them with superoleophilicity (0°) and hydrophobicity (138°). Addressing the limitations associated with traditional ceramic membranes, particularly in terms of stability and reproducibility, cyclic experiments confirm the significant stability and reproducibility of this composite membrane, ensuring reliable long-term applications for continuous oil-water separation. Leveraging the synergistic effect of TiO2 and the carbon fiber substrate, STCNFMs-5 demonstrate exceptional separation performance and notable self-cleaning capabilities. Following a 2-h exposure to ultraviolet light, the membrane's flux is restored to its original level. STCNFMs offer a promising solution for efficiently separating oil-water mixtures and emulsions, holding potential importance in water treatment and resource recovery endeavors.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zuhang Jin,Yiwei Zhao,Cheng Tao,Chao Zhang
Biodiesel production via solid acid catalysis route is one of the most promising and environmentally friendly ways to converting waste cooking oil (WCO) into green fuels. Mo 20 /SiO 2 -La solid acid catalyst shows satisfactory catalytic performance for the transesterification reaction. 91.0 % biodiesel yield can be obtained over the optimized catalyst at 155 ℃ with oil-to-alcohol molar ratio of 1:10 when using soybean oil as the reactant, and 87.1 % yield was obtained by using waste cooking oil. Mo 20 /SiO 2 -La has good reusability and can be regenerated by calcination and reused for at least 5 times. The catalyst was investigated by XPS, NH 3 -TPD, TGA, XRD, TPO, etc., and the promoting role of La (lanthanum) on the stability was discussed. The stability of Mo (molybdenum) active sites and the anti-carbon deposition capability of the catalyst was greatly enhanced by the introduction of La species. The LaO x species close to the Mo acidic sites effectively suppressed the deposition of free fatty acid and thus contributed to the good performance.
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高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Yanan Liu,Shengxi Wu,Qian Liao,Wenqiao Ye,Mingjun Zhang,Lvhong Gong,Haotian Wu,Doudou Xu
A novel electrochemical biosensor was designed for the detection of anti-Mullerian hormone (AMH) based on carboxylic multiwalled carbon nanotubes (CMWCNTs)/NH
2
–SiO
2
nanosphere materials. In our study, cross-linking agents were used to form CMWCNTs/NH
2
–SiO
2
composites. The functionalized anti-Mullerian tube hormone monoclonal antibodies were modified on the surface of the screen-printed electrode (SPE) to verify the response mechanism by the current changes caused by the binding of antigen to the antibody. CMWCNTs/NH
2
–SiO
2
enhances the electrical signal to enable a more robust binding of AMH proteins to the electrode. The electrochemical properties of the CMWCNTs/NH
2
–SiO
2
@AMH/SPE sensor was analyzed through cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The experimental results showed that the AMH detection range was wide, which had a linear correlation with AMH concentrations in the range of 1 fg and 100 ng mL-1, and the limit of detection concentration was 0.15 fg mL
-1
. Furthermore, our clinical sample experiments showed excellent AMH detection performance and specificity. The CMWCNTs /NH
2
–SiO
2
biosensor prepared in this paper effectively achieved the exact detection of low concentration AMH protein. It has great potential and application prospect in the clinical stage.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2012
·Vol. 64
·期 2
·347-357
·
IF 1.632
Zhang Jian-Ming,Zhai Shang-Ru,Zhai Bin,An Qing-Da,Tian Ge
Multifunctional nanomaterials with task-specific physicochemical properties, especially core–shell nanostructures with Fe 3 O 4 core and NH 2 -functional shells (Fe 3 O 4 @SiO 2 –NH 2 ), have been extensively investigated as high-performance adsorbents, catalysts and catalyst supports; and in most cases the controllable sol–gel technique is the choice for fabrication of this kind of widely applied materials. Herein, we demonstrated that mono-dispersed and spherical Fe 3 O 4 @SiO 2 –NH 2 nanomaterials with magnetic response core, NH 2 -functional shell structure can be facilely prepared by co-condensation of TEOS with APTMS using a versatile sol–gel process. It was shown that the proper usage of APTMS and appropriate pre-hydrolysis time of TEOS were crucial and key steps for formation of highly uniform and desirable amino loading Fe 3 O 4 @SiO 2 –NH 2 materials. The TEOS pre-hydrolysis and the critical time (around 90 min) before the addition of APTMS prove to be vital for uniform structure evolution, while the appropriate concentration of APTMS (~2.28 mmol L −1 in our system) leads to well-dispersed materials with relatively high loading of amino functionality. The as-prepared Fe 3 O 4 @SiO 2 –NH 2 magnetic nanoparticles prepared under optimum conditions possessing superparamagnetic behavior, uniform core–shell structure (~200 nm in diameter), relatively large BET surface area (~138 m 2 /g) and high incorporation of amino-functionality (~2.90 wt %).
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2012
·Vol. 88
·期 6
·1433-1441
·
IF 2.413
Cheng Peng,Xinjian Cheng,Sufang Chen,Xianghong Li,Tingcheng Li,Daohong Zhang,Zhengxi Huang,Aiqing Zhang
This article presents a facile method to prepare CdS/SiO 2 composite microspheres and their good catalytic properties. In our method, monodispersed SiO 2 particles bearing amino groups (–NH 2 ) were synthesized at first and then used as carriers to load nanosized CdS particles to form CdS/SiO 2 composite microspheres. With the addition of CdAc 2 solution to the SiO 2 dispersion, Cd 2+ was attracted to the surfaces of the SiO 2 particles through coordination interaction, and then thioacetamide was added to the dispersion. By heating, S 2− released and reacted with the Cd 2+ , CdS/SiO 2 composite microspheres were obtained accordingly. The photocatalytic properties of the as-prepared composite microspheres were investigated as well. It was found that the composite microspheres have excellent photocatalytic activities for the degradation of dyes comparing with the commercial P-25 TiO 2 catalysts. After using and recycling for three times, the photocatalytic performance still remained very well.
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PubMed
高影响因子
ACS Omega
·
2025
·
IF 4.3
Wenxi Zhu,Yuhan Luo,Haidong Li,Yufei Gong
In geothermal drilling, the significant rheological deterioration of biopolymer drilling fluids can lead to decreased cutting-carrying efficiency and fluctuations in annulus pressure, which can easily result in unpredictable downhole accidents. To address the challenges, this study innovatively introduces temperature-sensitive monomers (NIPAM) and nanosilica into molecular chains based on temperature response effects and adsorption stability to counteract the negative effects of temperature and salt ions, aiming to develop a rheological agent (PNA-SiO2) that is resistant to high temperature and salt. The molecular structure and thermal stability of PNA-SiO2 were characterized by FT-IR and TGA, and it was demonstrated to have the stability of the molecular main chain within 317 °C. According to rheological and filtration studies, PNA-SiO2 effectively addresses the issues of high-temperature viscosity attenuation and a sharp rise in the filtration volume of bentonite mud by aggressively adsorbing, creating a stable thixotropic network, and enhancing molecular repulsion. After aging at 60–180 °C, the drilling fluid with 2–4% PNA-SiO2 has excellent rheology (AV ≥ 57.5 mPa·s, PV ≥ 42 mPa·s, Gel10 min ≥ 1.533 Pa) and filtration (FLAPI ≤ 9.6 mL) properties that fully satisfy API requirements. The H–B model is the preferred model to accurately describe the rheology behavior of PNA-SiO2 drilling fluids. Moreover, under the comprehensive influence of Na+ on the interlayer spacing of bentonite and the thickness of the diffusion bilayer, PNA-SiO2 has applicability in high-temperature saturated saline water. After aging at 150 °C and 5–36% NaCl, the PNA-SiO2 drilling fluid exhibits stable viscosity (AV ≥ 55 mPa·s, PV ≥ 44 mPa·s) and low filtration volume (≤9.6 mL). In conclusion, PNA-SiO2 is used as a rheological and fluid loss agent, offering a cost-effective solution to the technical issues of severe leakage and inadequate cutting-carrying capacity encountered by geothermal drilling, which enables the safe and quick exploration of geothermal resources.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chen Zhang,Xin Wang
In this paper, CaO-B 2 O 3 -SiO 2 (CBS) is utilized as matrix material of microwave coating for the first time to achieve high-performance microwave absorption under high-temperature. A series of FeSiAl (FSA)/CBS composite coatings were prepared via atmospheric plasma spraying. The impact of spraying power on the microstructure, electromagnetic properties, and high-temperature stability of as-sprayed coatings were studied. The experimental results reveal that CBS could effectively suppress the formation of the lamellar structure of FSA as the low initial melting temperature, also form unexpected Fe 2 SiO 4 structure with FSA during the spraying process. The increase in complex permittivity of the coating is primarily attributed to enhanced coating density and the development of Fe-rich regions within the CBS matrix. Furthermore, the dense coating prevents the oxidation of FSA and exhibits high-temperature stability. Our coating of 1 mm thickness has a reflection loss below -5 dB with frequency range of 7–14.8 GHz at 500 °C.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 13
·5688-5695
·
IF 3.269
Xiaoming Xie,Jie Chen,Ye Sheng,Yanhua Song,Xiuqing Zhou,Xiangting Zhang,Zhan Shi,Haifeng Zou,Keyan Zheng
A series of novel color tunable dandelion-like SiO2:Ln3+ (Ln = Eu, Tb) nanophosphors of approximately 70 nm diameter were prepared using a simple hydrothermal route. The phase, time-dependent shape evolution, morphology, sizes, and luminescence properties of the as-prepared products were well characterized by means of X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, and photoluminescence spectra as well as kinetic decay curves. Under ultraviolet excitation, the Eu3+ and Tb3+ singly doped SiO2 samples showed strong red and green emission, respectively. Furthermore, the luminescence colors of the as-prepared Tb3+, Eu3+ co-doped dandelion-like SiO2 nanophosphors could be altered from green to red, including green-yellow, yellow, orange yellow and reddish orange, by simply adjusting the doping concentrations of Eu3+.
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高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Zhuo Xing,Julong Song,Hong Pan
The zinc orthosilicate, Zn 2 SiO 4 ceramics, exhibit great potential as microwave dielectric materials due to their low dielectric constant and ultrahigh quality factor. The solid-state synthesis of Zn 2 SiO 4 ceramics often results in the presence of a secondary phase of ZnO, however, leading to significantly lower Q × f values. Cold-isostatic-pressing (CIP) and nonstoichiometry have been proven effective in purifying the Zn 2 SiO 4 but need elaborate process and composition manipulation. In this work, it was found that the particle size of SiO 2 plays a crucial role in purifying the Zn 2 SiO 4 phase. Specially, nano-sized SiO 2 particles (15 and 30 nm) led to the formation of a ZnO secondary phase in synthesized Zn 2 SiO 4 ceramics, while micro-sized (2 and 10 µm) resulted in pure-phase Zn 2 SiO 4 with excellent microwave properties. Notably, when prepared with 10 µm SiO 2 and sintered at 1 340°C, the resulting Zn 2 SiO 4 exhibited outstanding microwave performances with a Q × f value of 122 570 GHz, a temperature coefficient of frequency τ f of −51.9 ppm/°C, and a dielectric constant ( ε r ) of 6.5. These findings highlight the importance of controlling particle size during synthesis to achieve desired material properties such as purity and excellent microwave performances.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 10
·1-11
·
IF 2.6
Guo Yawen,Yang Li,Lv Chengcheng,Mai Chongyang,Zhao Lielun,Jiang Yan,Zhang Hongwen
Inspired by nepenthes pitcher plants, the slippery liquid-infused porous surfaces have received extensive attention. In its practical application, good oil storage and oil-locking ability are important guarantee for the surface to maintain the interface performance for a long time. In this paper, mesoporous silica (KCC-1) was obtained by cetyltrimethylammonium bromide (CTAB) as template agent, urea as a hydrolyzing agent, and TEOS as silicon source reagent, then modified with (3-Aminopropyl) trimethoxysilane. Then combined with the breath figures, amino-modified mesoporous silica, 3,3’-4,4’-biphenyltetracarboxylic dianhydride (S-BPDA), 2,2’-bis[4-( 4-aminophenoxyphenyl)]propane (BAPP) were used as raw materials to prepare polyimide SLIPS with good stability by a two-step method. The wettability and stability of SLIPS were investigated, and the results show that the introduction of mesoporous silica inorganic nanoparticles enhanced the performance of SLIPS. Among them, the sliding angle of polyimide SLIPS with a nanoparticle content of 10% is 2°, which has good self-cleaning performance, antifouling performance, and stability.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Ning Ding,Yi Yang,Rui Zhang,Pengwu Xu,Deyu Niu,Weijun Yang,Piming Ma
In this work, vanillin based inherently flame retardant polyurethane/SiO 2 composite foams were designed. Firstly, the vanillin based flame retarding diol (VDP) was synthesized. Then, the KH550 modified nano-SiO 2 (KH550-g-SiO 2 ) was prepared as the reinforcement. Subsequently, a series of flame-retardant polyurethane/SiO 2 composite foams (PUF-0.5P- x SiO 2 ) were synthesized by tailoring the hard-soft segments and KH550-g-SiO 2 contents. The results showed that KH550-g-SiO 2 significantly improve the thermal stability of the PUF-0.5P- x SiO 2 foams. In addition, the compressive strength of PUF-0.5P- x SiO 2 foams was enhanced from 0.18 MPa (PUF-0.5P) to 0.45 MPa (PUF-0.5P-2.0SiO 2 ) under 20% strain. The flame retardant properties of PUF-0.5P-2.0SiO 2 reached UL-94 V-0 grade. Meanwhile, the addition of KH550-g-SiO 2 also decreased the thermal conductivity from 0.046 W/m·k to 0.037 W/m·k for PUF-0.5P-2.0SiO 2 . This work may provide an approach to obtain the biobased lightweight polyurethane foams for the application in packaging and building areas.
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高影响因子
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