FUEL
·
2021
·
IF 6.609
Zhipeng Tian,Xuebin Liang,Rongxuan Li,Chao Wang,Jianping Liu,Libin Lei,Riyang Shu,Ying Chen
Catalytic hydrodeoxygenation (HDO) is a popular route to upgrade the pyrolysis lignin-oil that is abundant of phenolic compounds, and the synergistic effect of bimetal enables to improve the catalytic activity significantly. In this work, a series of non-noble metal catalysts are synthesized and their HDO performances of guaiacol are compared. Optimized NiCo/SiO 2 -ZrO 2 catalyst expresses a 100% conversion and a 99.9% selectivity of cyclohexane product, which is higher than those over Ni/SiO 2 -ZrO 2 catalyst. Catalyst characterization results demonstrate that the interaction between Ni and Co promotes the reduction of metal site and the adsorption of hydrogen, which is the crucial factor during HDO process. Besides, the electron transfer from Co to Ni species weakens the C-O bond of substrate intermediate and results in its cleavage to transform cyclohexanol to cyclohexane. This is also the rate determining step in the HDO of guaiacol. Specific kinetic study is conducted to verify the reaction pathway and the structure–activity relationship. The HDO reaction of guaiacol on NiCo/SiO 2 -ZrO 2 fits the first order kinetic model well. The apparent E a of 55.9 kJ·mol −1 is lower than those of the noble metal catalysts reported in previous studies. In addition, the upgrading of raw pyrolysis lignin-oil on this non-noble bimetallic catalyst also achieves a high HDO efficiency, with the hydrocarbon contents increased from 4.2% to 60.6%. The good HDO performance of this cheap and easy-prepared NiCo catalyst proves its promising potential in the upgrading of lignin-oil for the production of hydrocarbon fuels.
研究领域:
能源化学
·
催化科学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Rong Dai,Ziliang Zheng,Kai Shi,Xu Wu,Xia An,Xianmei Xie
Ethanol steam reforming (ESR) has drawn great attention for sustainable H 2 production. Design active and sinter resistant nanocatalysts are critical issues for ESR reaction. Herein, a core–shell structured Pt-Cu@Ni-SiO 2 nanocomposite for ESR reaction has been synthesized via a one-pot facile encapsulation strategy, which is featured by highly active and sintering resistance for ESR reaction. Structural and morphological characterizations revealed that each Pt-Cu@Ni-SiO 2 nanocomposite contained a 3 nm Pt-Cu core and multiple Ni nanoparticles with diameters of around 3 nm anchored on the SiO 2 shell. The Pt-Cu@Ni-SiO 2 nanoreactor exhibited higher ethanol conversion (99.99%) and H 2 selectivity (70.32%) and an excellent stability with no loss of activity after 50 h of reaction at 450 °C. The advantages were originated from the ultra-small size of metal nanoparticles and the unique core–shell structure provides a great opportunity to give full play to the catalytic activity of active sites thus guaranteed excellent catalytic activity. Compared with the supported Pt-Cu@Ni-SiO 2 catalyst, the Pt-Cu@Ni-SiO 2 nanoreactor exhibit good stability and sintering resistance due to the encapsulation of the metal nanoparticles and the enhanced metal-support interaction. Thus, it is supposed that this type of catalyst opens a new strategy for the design of the ESR catalyst.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 6
·期 4
·1222-1232
·
IF 5.426
Yunus Ahmed,Zahira Yaakob,Parul Akhtar
A SiO2-supported Fe and Ni bimetallic catalyst has been synthesized, characterized and, for the first time, tested as a heterogeneous photo-Fenton catalyst for the degradation and mineralization of methylene blue (MB) dye. The morphological, structural, and optical properties of this catalyst were analyzed using FESEM, XRD, FTIR and UV–vis spectroscopy. The photocatalytic degradation of MB has been investigated using Fe–Ni/SiO2 catalysts under visible and solar light irradiation in aqueous solutions. The effects of solution pH, H2O2 concentration, initial MB concentration, catalyst dosage and light intensity on the degradation of MB have been systematically investigated. An almost complete degradation was achieved within 60 min with a solution pH of 3.00, a H2O2 concentration of 3.0 mM L−1 and a catalyst dose of 0.85 g L−1. The degradation and total organic carbon (TOC) removal efficiencies were 99.80% and 86.19%, respectively, for sunlight. However, the values were only 99.01% and 75.71% for visible light. These results suggested that Fe–Ni/SiO2 possesses significant catalytic activity, and the solar-Fenton process is a feasible method for degrading and mineralizing the MB dye compared with artificial visible light. The catalytic action is attributed to H2O2 and the formation of hydroxyl radicals (˙OH) by Fe(III) in Fe–Ni/SiO2via the photo-Fenton reactions. Furthermore, we determined that the catalyst activity can be replicated in successive experiments without a significant decline in the Fe–Ni/SiO2 and H2O2 processing efficiency under light irradiation. Our results will be useful for future improvement of active heterogeneous photo-Fenton catalysts for developing organic dye-containing wastewater treatments.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Shibo Yu,Jiesong Tan,Yiqing Zeng,Jianzhong Zheng,Guangyu Zhou,Xiangsen Xu,Yutang Kang,Shipeng Wan,Zhaoxiang Zhong,Weihong Xing
Multifunctional air-purifying materials have attracted much attention in dealing with indoor air pollution including particulate matter (PM) and hazardous gaseous pollutants (e.g., HCHO), while its development faces long-term challenges of high efficiency and low resistance. Herein, we fabricated a novel hierarchical porous structure TiO 2 –SiO 2 (TS) fiber membrane using a handy electrospinning method. The hierarchical porous structure, comprising micropores and mesopores within fibers and fiber stacking-induced macropores, endows the TS fiber membrane with an astonishing specific surface area of 351.4 m 2 g −1 and a high gas permeability of 1079.4 m 3 m −2 ·h −1 ·kPa −1 . The interconnected pore structure offers additional potential pathways for clean air, which contributes to enhancing PM capture and lower filtration resistance. Consequently, the TS fiber membrane showed a gratifying filtration efficiency of 99.89 % for PM 0.3 and 99.98 % for PM 2.5 at a velocity of 5.33 cm s −1 with an air resistance as low as 69.3 Pa. It is noteworthy that the interconnected microporous-mesoporous structure in fiber also facilitates the adsorption and enrichment of HCHO molecules, thereby increasing the local concentration and thus markedly enhancing the catalytic efficiency. As a result, the membrane demonstrated a photocatalytic removal efficiency of 98.46 % for HCHO under UV light at a high gas velocity of 600 L g −1 ·h −1 . Interestingly, we found that the membrane can maintain good long-term cyclic stability by simply replenishing adsorbed water on the surface. This work would provide new insight for developing advanced multifunctional air purification membranes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Wenzong Xu,Hongyi Yan,Guisong Wang,Zhongqiong Qin,Liangjie Fan,Yuxiong Yang
To reduce the fire hazard of epoxy resin (EP), ZIF-67/g-C 3 N 4 @SiO 2 (ZCS) hybrid material was prepared by electrostatic interaction and sol-gel method. The structure and morphology of ZCS were investigated by flourier transform infrared spectrometer, X-ray diffraction and scanning electron microscope . It was found that the latent fire hazard of EP was reduced via the addition of ZCS hybrid material. The EP composite with 3 wt% of ZCS had better fire safety than EP. Cone results showed that the heat and smoke emissions of EP composites were reduced to varying degrees, and specifically their peak heat release rate, total heat release rate, peak smoke production rate and total smoke production were reduced by 46.8%, 21.7%, 45.2% and 19.3%, respectively. In addition, the possible flame retardance and smoke depression mechanism of ZCS hybrid material is also discussed in this article.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Mingyang Zhou,Junchao Chen,Wenjin Zhou,Juan Sun,Hongyan Tang
Membrane fouling is still an inevitable main challenge to nanofiltration (NF) process, which leads to a decline in membrane performance. Inspired by fish scales, a facile method was performed to develop composite NF membranes with highly stable antifouling property based on hydrophilic roughness. γ-(2,3-glycidyloxy) trimethoxysilane (KH560) grafted onto PEI molecules during interfacial polymerization on hydrophilic microporous PTFE support. Finally, tetraethyl orthosilicate (TEOS) reacted with KH560 molecules. Results of fourier transform infrared (FTIR) spectra, FESEM and contact angle measurements indicated that micro/nano hydrophilic SiO 2 spheres engendered on the membrane surface. Evaluation of membrane antifouling property showed that flux recovery ratio (FRR) of BSA, HA, SDS and Oil/water mixture for the as-prepared NF membranes were 96.0%, 95.8%, 96.8% and 95.0%, respectively. No obvious permeate flux decline and rejection fluctuation could be observed in filtration experiment of MgSO 4 aqueous solution on long-term run (100 h). It indicated highly stable antifouling property, which may be due to hydrophilic microscale/nanoscale SiO 2 spheres grafted onto the skin layer of the as-prepared NF membranes through chemical linkage. It is expected that these findings could provide more insight for fabrication and simultaneous modification of NF membranes.
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
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Xiu-Ping He,Zi-Ru Lian,Li-Ju Tan,Jiang-Tao Wang
Highly selective and efficient magnetic molecularly imprinted polymers (MMIPs) were prepared using Fe 3 O 4 @SiO 2 as a magnetic supporter, 3-methacryloxypropyltrimethoxy-silane (MPS) as a silane coupling agent, DIS as a template, methacrylic acid (MAA) as a functional monomer and ethyleneglycol dimethacrylate (EGDMA) as a cross-linker for the extraction of trace residuals of the synthetic estrogen dienestrol (DIS) in seawater, which is a concern worldwide for its endocrine disruption and carcinogenic danger to human health. The obtained MMIPs were demonstrated to have spherical morphologies, core-shell structures, large binding capacities, high efficiency and selectivity. These were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and adsorption experiments. Owing to the specific binding sites, the MMIPs exhibited an almost three times higher adsorption capacity towards DIS (Q max = 4.68 mg g −1 ) than magnetic molecularly non-imprinted polymers (MNIPs) (Q max = 1.72 mg g −1 ). DIS in spiked seawater samples from the Weihai Bay of China was extracted and enriched by MMIPs, and satisfactory recoveries (87.3%–96.4%) with low relative standard deviation (RSD) values (2.03%–5.18%, n = 5) were obtained. The limit of detection (LOD) of the method obtained was 0.16 μg L −1 , and the limit of quantitation was 0.52 μg L −1 after MMIPs. No significant deterioration of the adsorption capacity of the MMIPs was observed after six rounds of regeneration. The results further demonstrated the applicability of the MMIPs method, a simple and straightforward method for the extraction and enrichment of DIS in seawater without any time-consuming procedures.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Rui Liu,Wan-Fen Pu,Dai-Jun Du
A novel core–shell polymer (HBAPAM) with functionalized nano-SiO 2 as core, multibranched associative polymeric chains as shell was synthesized through in-situ free radical polymerization strategy. TGA, IR, 1 H NMR, and SEM proved the notion and method of preparing of HBAPAM was applicable. The core–shell structure and multibranched morphology enhanced the supramolecular interaction of HBAPAM, which displayed the desirable viscosified efficiency and viscoelasticity, especially, long-term stability in harsh temperature and salinity condition. HBAPAM featured the rheology in multiscale consistently in deionized water and formation water. Core flooding experiments confirmed that HBAPAM had high cost performance in the variable permeability of oilfields.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2017
·
IF 2.354
Ru-Jun Chen,Yi-Bo Zhang,Ting Liu,Bingqing Xu,Yang Shen,Liangliang Li,Yuan-Hua Lin,Ce-Wen Nan
A simple way to assemble an all-solid-state lithium-ion battery with ultrahigh surface capacity and energy density was established. Polyethylene oxide-based solid-state electrolyte was prepared via solution method and nano-SiO 2 was added into the electrolyte to increase the conductivity. Thick compact LiFePO 4 pellet infused with dry polymer electrolyte was used as the composite cathode in the all-solid-state lithium battery . The compact composite cathode not only showed large ionic and electronic conductivity , but also provided sufficient “free space” to compensate the volumetric change of the active materials during cycling. The all-solid-state lithium battery (composite cathode/dry polymer electrolyte/Li) was cycled at a constant current density of 200 μA/cm 2 at 60 °C. A maximum discharge specific capacity of 157 mAh/g was achieved and the surface capacity reached 15 mAh/cm 2 , which was of critical significance for all-solid-state lithium batteries. Good capacity retention was achieved after 10 cycles and great rate performance was obtained. Even at a current density of 1000 μA/cm 2 , the battery delivered a specific discharge capacity of 71 mAh/g, corresponding to a surface capacity of 6 mAh/cm 2 . The experimental data demonstrated that the composite cathode was a promising design in high-performance bulk-type all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Qiangying Zhang,Man He,Beibei Chen,Bin Hu
In this paper, magnetic mesoporous carbon composites were prepared by calcination of the mixture of magnesium citrate and Fe3O4@SiO2 in an inert atmosphere. A high content of Fe3O4@SiO2 and MgO was in situ embedded in a carbon matrix. After removing the MgO template by diluted acid, the resulting material (Fe3O4@SiO2@mC) was subjected to further H2O2 oxidation treatment. The formed oxygen-containing functional groups on the products provided plenty of active sites for the adsorption of analytes of interest. The obtained composites (Fe3O4@SiO2@mC-H2O2) exhibited a mesoporous structure with a high specific surface area of 731 m2 g–1. The adsorption capacities of Fe3O4@SiO2@mC-H2O2 for Cu(II) and Pb(II) were calculated to be 86.5 and 156 mg g–1, respectively. Under optimal conditions, the adsorption isotherm of Cu(II) and Pb(II) onto Fe3O4@SiO2@mC-H2O2 fitted the Langmuir model and the adsorption kinetic was well-correlated with the pseudo-second-order model. Besides, Fe3O4@SiO2@mC-H2O2 exhibited fast removal dynamics (within less than 1 min) for Cu(II) and Pb(II), demonstrating great application potential in wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 18
·4193-4202
·
IF 3.286
Liu Chunlan,Yu Danxia,Ge Fuchun,Yang Limin,Wang Qiuquan
Ru(bpy) 3 @SiO 2 -COOH and Ru(bpy) 3 @SiO 2 @CD47-peptide nanoparticles (NPs) with fluorescent and mass spectrometric properties were designed and synthesized as the models of drug-nanocarriers. Their phagocytic internalization could be quantitatively measured using more sensitive inductively coupled plasma mass spectrometry (ICPMS) ( 102 Ru) versus traditional laser confocal scanning microscope ( λ ex/em = 458/600 nm) for the first time. Modification of a self-signal trigging CD47-peptide on the NPs’ surface decreased internalization by 10 times, (2.79 ± 0.21) × 10 4 Ru(bpy) 3 @SiO 2 -COOH and (0.28 ± 0.04) × 10 4 Ru(bpy) 3 @SiO 2 @CD47-peptide NPs per RAW264.7 macrophage ( n = 5). The alkynyl-linked CD47-peptide allowed us to quantify the number (2412 ± 250) of CD47-peptide modified on the NP and the total content (5.14 ± 0.25 amol) of signal regulatory protein α (SIRPα) on the macrophage by measuring the clickable tagged Eu using ICPMS. Furthermore, the interaction between CD47-peptide and SIRPα as well as the changes of the remaining free SIRPα during the internalization process of Ru(bpy) 3 @SiO 2 @CD47-peptide NPs were quantitatively evaluated, providing direct experimental evidence of the longspeculated crucial CD47-SIRPα interaction for drug-nanocarriers to escape internalization by phagocytic cells. Remarkable difference in the internalization ratio of 12.3 ± 4.8 of Ru(bpy) 3 @SiO 2 -COOH NPs and 4.3 ± 0.5 Ru(bpy) 3 @SiO 2 @CD47-peptide NPs with and without the protein corona indicated that CD47-peptide still worked when the protein corona formed. Not limited to the evaluation of the NPs studied here, such a fluorescent and mass spectrometric approach is very much expected to apply to the assessment of other drug-nanocarriers designed by chemists and before their medical applications.
Graphical abstract
研究领域:
纳米技术
·
药理学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chenlu Xue,Haipeng Jiang,Jiafeng Cheng,Wei Gao
Safe production and widespread application of AlH 3 are limited by unstable hydrogen evolution and explosion risk. Alkali (earth) metal compounds, A(E)MCs, are promising materials for inhibiting AlH 3 explosions due to abundant reserves, low toxicity, and environmentally friendly. Currently, systematic evaluation of explosion inhibition effect (EIE) and understanding of inhibition mechanism is lacking. This study examines the inhibition behavior of 16 A(E)MCs for AlH 3 explosions using thermal properties of A(E)MCs to select inhibitors, and EIE of different groups on AlH 3 is analyzed. Notably, KH 2 PO 4 effectively reduces explosion intensity to 0.53 MPa·m/s, with the maximum pressure and maximum pressure rise rate of 0.68 MPa and 4.63 MPa/s. EIE can be quantitatively described by relative changes in particle Al 2 O 3 , and preventing the formation of particle Al 2 O 3 can be effective in improving EIE. Combining characterizations and simulation results reveals that A(E)MCs inhibit AlH 3 explosions in both chemical and physical ways. Further, the synthesized composite inhibitor KH 2 PO 4 /SiO 2 , which adsorbs flame radicals, reduces explosion intensity by 92.23 % and enhances EIE by 4.33 %. We hope our work can provide theoretical support for the safe application of hydrogen storage materials and the quantitative assessment of EIE.
研究领域:
材料科学
·
安全工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）