Materials Today Communications
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2023
·
IF 3.8
Tan Mao,Xiaoting Shi,Mengchen Liu,Qiang Su,Youliang Cheng,Changqing Fang,Xueke Luo
Ordered mesoporous materials are one of the mesoporous materials with a pore diameter of 2–50 nm. They are a new kind of materials with uniform pore size, highly ordered nanopores and high specific surface area. SBA-15 is a typical ordered mesoporous material. In addition, polymeric composites based on SBA-15 have been widely used in many fields. At present, the characterization of the pore structure of SBA-15 is usually obtained by chemical or physical experiments. However, due to many uncertain factors in the experiment process, it is impossible to know whether the sample meets the experimental conditions before detecting it. The trial and error cost in this process is too high, and repeated measurement experiments will greatly damage the pore structure. In this paper, using computer to simulate the pore size distribution of SBA-15 based on the pore size distribution maps of SEM and TEM images. Firstly, the image is segmented by threshold, then the aperture data are obtained by the maximum inscribed circle algorithm, and finally the probability density curve of aperture distribution is obtained by a statistical method. The results show that the aperture probability density curve obtained by this method is more similar to the real aperture distribution curve. This method provides a reference for reducing the experimental cost in the process of preparing SBA-15.
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高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2022
·
IF 0.243
Huang Yuhua,Liu Xiaogang,Shi Minxin,Qin Yuanyuan,Li Xiancai
The lanthanum ion imprinted polymer (La-IIP/SBA-15/Y) was successfully synthesized by the surface ion imprinting method. Using La-IIP/SBA-15/Y as the adsorbent to adsorb lanthanum ions, the overall empirical conditions were optimized, and the best exploratory conditions were finally found. The pH of the solution was 2; the adsorption equilibrium was reached in 60 min and the saturated adsorption capacity was 562.95 mg/g La-IIP/SBA-15/Y adsorbed gadolinium ions in the study of its adsorption process and found that it conforms to the Langmuir isotherm adsorption model, and the adsorption reaction is a spontaneous reaction, and it also conforms to the quasi-second-order kinetic model. The selectivity of the adsorbent was explored experimentally, and the results showed that La-IIP/SBA-15/Y has good selectivity, and experimental elution and regeneration performance. The best elution effect is 2 mol/L hydrochloric acid. La-IIP/SBA-15/Y has good stability and can be reused.
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Molecular Catalysis
·
2021
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IF 5.062
Yue Zhang,Zhiyong Pan,Nan Wang,Li Wang
Silica SBA-15 without removal of template P123 was calcined in an inert atmosphere and the carbon-modified SBA-15 thus obtained was used as the support of Pd catalyst for the hydrogenation of 2-ethylanthraquinone (EAQ). The effects of extraction times of P123 in SBA-15 with water prior to inert calcination and calcination temperature on the structure and catalytic performance of Pd catalyst were studied. The results of elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma, Fourier transform infrared spectroscopy, Raman spectra, water contact angle measurement, N 2 adsorption-desorption, transmission electron microscopy and energy dispersive X-ray mapping showed that carbon content of catalysts varied in the range of 3.4 % and 1.1 % with increasing extraction times from 0 to 6 due to the decrease in the residual amount of P123 in uncalcined SBA-15. With rising calcination temperature, the occurrence state of carbon in catalysts was converted from amorphism into graphite. The Pd catalyst supported on SBA-15 extracted for 3 times and calcined at 650 °C had 2.0 % carbon, and exhibited the highest activity (0.37 molH 2 ·gPd −1 ·min −1 ) and selectivity (98.9 %). This is due to the presence of appropriate amount of carbon, which provided a relatively high hydrophobicity without significantly reducing the specific surface area and pore size of SBA-15 support. The high hydrophobicity benefits the adsorption of EAQ from the working solution to the surface of catalyst.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2019
·Vol. 25
·期 6
·595-602
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IF 0
Wang Nan,Ma Qingqing,Yuan Enxian,Wang Li
SBA-15 silica was synthesized by adding normal paraffin and alkyl benzene as swelling agents and using a low-temperature gelation procedure. Pd was then impregnated on SBA-15, yielding a catalyst. Characterizations of the catalyst by X-ray diffraction, N 2 adsorption/desorption, scanning electron microscopy, transmission electron micrographs, X-ray photoelectron spectroscopy, in situ FTIR, and a hydrogenation test of 2-ethyl-anthraquinone reveal that the addition of C 6 ‒C 9 normal paraffin and 1,3,5-triisopropylbenzene could enlarge the pore diameter without a significant loss of ordered structure. Moreover, the length of SBA-15 pore channels decreased significantly. However, the sizes of Pd particles increase as the pore diameter is enlarged. The largest pore size (13.6 nm) and short length of pore channels (ca. 0.35 μm) are achieved by adding n-hexane. As a result, this catalyst exhibits the highest hydrogenation activity with an approximately 100% improvement, compared with a conventionally synthesized catalyst in the absence of a swelling agent.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Lina Gao,Junfei Wu,Hai-Bo Liu,Qian Zhao,Jing Wang
Naphthalimide-functionalized chitosan and mesoporous SBA-15 silica were integrated by forming CS–HNB@SBA nanocomposites. SBA-15 served as a solid matrix that enabled good water dispersibility and reusability. To achieve distinction between tetracycline (TET) and oxytetracycline (OTC), CS–HNB@SBA and rhodamine derivative-modified SBA-15 constructed a fluorescent ensemble. To improve determination accuracy and sensitivity, multiple recognition sites (Eu 3+ and Zn 2+ ) were incorporated to build metal-mediated sensing systems. When tetracycline antibiotics (TCs) were present, blue emission of naphthalimide at 389 nm was quenched based on Förster resonance energy transfer, whereas characteristic peak of Eu 3+ at 619 nm (or TCs Zn 2+ at 527 nm) was enhanced through antenna effect (or chelation of TCs and Zn 2+ ) based on “CS–HNB@SBA-metal ion-TCs” ternary complex. Fluorescent color displayed obvious changes from blue to red (or green), showing a huge potential for visual determination. Ultra-low detection limits of TET (or OTC) were 0.048 (or 0.064 nM) and 0.072 nM (or 0.042 nM), respectively, by using CS–HNB@SBA/Zn 2+ and CS–HNB@SBA/Eu 3+ , respectively, due to their amplified and synergistic fluorescence signals. This work enriches the strategy for constructing ultrasensitive fluorescent probes by taking advantage of cooperative effect of multiple recognition sites, and offers insights into efficient ensemble platforms for structurally similar analytes.
研究领域:
分析化学
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环境科学
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生物医学工程
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PubMed
高影响因子
MATERIALS & DESIGN
·
2016
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IF 3.997
Lixia Li,Yumeng Sun,Bing Cao,Huaihe Song,Qiang Xiao,Wenping Yi
Polymer/mesoporous silica composites have drawn much attention. In this study SBA-15 mesoporous silicas with three morphologies including fiber, nano-rod and sphere were synthesized and characterized. Polyurethane (PU)/SBA-15 composites were prepared via an in-situ reactive-layer spray technique on urea granules. And the effects of SBA-15 on structure and controlled release performance of coating were elucidated and compared to n -SiO 2 . The results showed that rod-like SBA-15 with an average particle size of 700 nm extremely improved the release properties of PU at the same filler loading, but the other two SBA-15 fillers had no effect on PU instead. SEM images reflected that although SBA-15 particles were all well-dispersed in PU matrix to form a sea-island structure, PU/fiber-like SBA-15 composite coating had some obvious defects. Conversely, n -SiO 2 particles of coating gathered and formed large agglomerates without voids. TGA studies suggested that PU/rod-like SBA-15 composite as a coating material had a much higher thermal stability than PU and PU/ n -SiO 2 .
研究领域:
材料科学
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化学工程
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2012
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IF 2.237
Jianhua Guo,Renxiang Ruan,Ying Zhang
Phenolic compounds in bio-oil are not stable and difficult to be upgraded to ideal fuels. In this study, simulated bio-oil as well as phenolic compounds separated from bio-oil by glycerol-assisted distillation were hydrotreated by Ru/SBA-15 catalyst and completely converted into C3 to C10 alcohols at mild conditions, which could be a feasible way to transfer the phenolic compounds in bio-oil or other real systems from lignin decomposition into high heating-value liquid fuel or fuel additives. The stability of the Ru/SBA-15 catalyst was also investigated. It was found that Ru/SBA-15 was stable with phenolic compounds in the simulated bio-oil but not in a real one.
研究领域:
能源生物学
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催化化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
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IF 6.6
Le Yu,Hong Li,Zhaoyi Xu,Shourong Zheng,Tao Long,Wang Lei
Ultrafine Pd nanoparticles were stabilized on aminopropyl-functionalized SBA-15. • The catalyst enabled efficient FA decomposition and TCE hydrochlorination. • Successful TCE removal was achieved through FA-driven catalytic hydrogenation. Trichloroethylene (TCE), a persistent and highly toxic groundwater contaminant, demands efficient remediation strategies. Formic acid (FA, HCOOH)-assisted catalytic hydrodechlorination (HDC) is a promising approach for TCE removal, with Pd-based catalysts exhibiting excellent activity for both FA dehydrogenation and C-Cl bond hydrogenation. This study investigates an amino-functionalized SBA-15-supported Pd catalyst (Pd/SBA-15-NH 2 ) for TCE degradation in the FA-driven hydrogenation system. TEM and XPS characterization showed that the amino groups significantly enhance Pd dispersion and stabilize positively charged Pd δ+ species, furthermore in-situ DRIFTs tests conclusively confirmed that HCOO* species serve as the key intermediates in the FA dehydrogenation process, DFT study also showed Pd/SBA-15-NH 2 have lower free energy and thus improve the activity of FA dehydrogenation. Kinetic analysis confirmed a pseudo-first-order pathway with an TOF of 208.6 h −1 and apparent activation energy of 46.6 kJ/mol. Under optimized conditions (pH = 5.6, 25 °C), the catalyst achieved 100% TCE conversion in 120 min with a initial activity of 0.072 mM/(g min). Meanwhile, ethane (C 2 H 6 ) as the dominant reaction product, indicating that TCE degradation proceeds via a one-step rather than dechlorination mechanism. These findings provide valuable insights for catalytic dichlorination mechanism for chlorinated ethenes, while highlighting the theoretical foundation for the development of high-performance, noble metal-based catalysts in environmental applications. Download: Download high-res image (107KB) Download: Download full-size image
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2022
·Vol. 38
·期 6
·1504-1511
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IF 2.726
He Kai,Liu Shijia,Zhao Guiyan,Qin Yucai,Bi Yanfeng,Song Lijuan
A series of Ni-W catalysts supported on mesoporous SBA-15 with different Ni:W ratios(Ni x W/SBA-15, Ni-5%, x =1, 10, 50) was prepared and fully characterized by powder X-ray diffraction(PXRD), Brunner-Emmet-Teller(BET), transmission electronic microscopy(TEM), H 2 -temperature programmed reduction(H 2 -TPR), and X-ray photoelectron spectroscopy(XPS). High-resolution TEM images, XPS measurements, H 2 -TPR experiments coupled with PXRD results determined the evolution of Ni and W species. It is found that a trace amount of W from H 2 WO 4 can significantly improve Ni dispersion on SBA-15 (Ni 50 W/SBA-15) with Ni 0 and non-stoichiometric WO x species as small as ca . 3.6 nm. The prepared Ni x W/SBA-15 was utilized for CO 2 hydrogenation, which showed that a higher W content restrained the CO 2 hydrogenation while a lower W ratio promoted both conversion rate and selectivity for methane compared with Ni/SBA-15. The Ni 50 W/SBA-15 catalyst showed the best performance with a 93.3% CO 2 conversion rate and 99.7% selectivity for methane at 400 o C under 0.1 MPa and maintained ca . 97% initial performance for 24 h. Tracking product evolution experiments by in-situ Fourier transform infrared spectrascopy(FTIR) indicated that a small amount of W can modify the surface of Ni particles by geometric coverage and electronic modification, which facilitates the adsorption of the CO intermedia and results in the formation of CH 4 . This work provides a new clue to fabricating efficient CO 2 conversion bimetallic materials.
研究领域:
催化化学
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环境化学
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材料科学
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能量转换
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二氧化碳利用
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高影响因子
Journal of Materials Chemistry A
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2013
·Vol. 1
·期 9
·3171-3176
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IF 0
Jian Zhi,Sheng Deng,Yuxuan Zhang,Youfu Wang,Aiguo Hu
A three dimensional porous carbon nanomembrane (CNM), silica-supported CNM (SS-CNM), is developed by formation of a self-assembled monolayer of an enediyne compound on the surface of mesoporous silica (SBA-15) followed by Bergman cyclization and carbonization. The SS-CNM is applied as a conductive support for the electroactive material Co3O4 to fabricate advanced supercapacitors. A large fraction of Co3O4 clusters (66% of total weight) are impregnated in the SS-CNM host to form regularly packed nanorods with diameters of 7 nm. The specific capacitance of the supercapacitor electrode material reaches 1086 F g−1 (1645 F g−1 based on Co3O4) with aqueous electrolyte. This extraordinary high performance of the electrode material is attributed to the unique pore structure of the SS-CNM support that enhances the use of active material and shortens the transport path of ions and electrons.
研究领域:
材料科学
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储能
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纳米技术
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电化学
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2017
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IF 1.174
Tianhan Zhu,Hua Song,Xueya Dai,Hualin Song
The Al-doped Ni 2 P/Al-SBA-15 catalyst with high hydrodeoxygenation (HDO) activity was synthesized by temperature programmed reduction at a relatively low reduction temperature of 400 °C. The as-prepared catalyst was characterized by X-ray diffraction (XRD), H 2 temperature-programmed reduction (H 2 -TPR), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), NH 3 temperature programmed desorption (NH 3 -TPD), N 2 adsorption–desorption and CO uptake. The effect of Al on benzofuran (BF) HDO performance was investigated. The result indicates that the incorporation of Al into the SBA-15 support can promote the formation of much uniform, smaller, highly dispersed Ni 2 P particles on the catalyst. The Al also contributes to suppress the enrichment of P and promote more exposed Ni sites on the surface. In addition, the incorporation of Al can enhance the acid strength. The total deoxygenated product yield over Ni 2 P/Al-SBA-15 reached 90.3%, which is an increase of 19.4%, when compared with that found for Ni 2 P/SBA-15 (70.9%).
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Reaction Chemistry & Engineering
·
2020
·Vol. 5
·期 9
·1833-1844
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IF 3.441
Guochao Yang,Lingtao Wang,Haoxi Jiang
Upgrading bio-ethanol into high value chemicals is an important issue in biomass conversion, and conversion of ethanol into butadiene is one of the most feasible methods. Here Zr-incorporating mesoporous SBA-15 (Zr–SBA-15) materials with different Si/Zr ratios were successfully synthesized by a one-pot method and were employed as catalysts for the conversion of the ethanol (EtOH)–acetaldehyde (AcH) mixture to butadiene. The textural structure and acidity of Zr–SBA-15 were investigated by using XRD, N2 adsorption, TEM, FT-IR, UV-vis, XPS, NH3-TPD and Py-IR, and the results of these characterizations indicated the mesoporosity of Zr–SBA-15 and confirmed the incorporation of Zr into the framework. Zr–O–Si bonds were formed by the incorporation and exhibited Lewis acidity predominantly. The influence of the Si/Zr ratio and reaction conditions (temperature, EtOH/AcH ratio and WHSV) showed that a suitable Si/Zr ratio was needed to balance the butadiene selectivity, by-product selectivity and total conversion. Amongst the prepared catalysts, Zr–SBA-15-20 achieved the best butadiene selectivity of 74.0% at a relatively low temperature (275 °C). The good catalytic performance could be attributed to the homogeneous dispersion of Zr species and Zr–O–Si bond generated by Zr incorporation. Furthermore, EtOH-TPD and AcH-TPD experiments proved the essential role of acetaldehyde addition and the well-accepted reaction pathway.
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