CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yijun Xue,Wei Sun,Qian Wang,Limei Cao,Ji Yang
MOFs (metal-organic frameworks) are stable materials with both organic and inorganic pores, and possess high surface area fascinating structures. Owing to the unique octahedral of aluminum center and strong Al–O bonds, Al-based MOFs show excellent thermal stability. In this paper, MIL-96(Al) is proved to be effective at dispersing Pt particles evenly and sparsely as it is employed as catalyst support. MIL-96(Al) is synthesized via a water based route and different contents of Pt particles are directly deposited on the surface of MIL-96 in one step by hydrothermal method to prepare Pt X MIL-96 (x represents Pt content) catalysts. The catalyst are sprayed evenly on carbon paper, with Pt content of 0.03%, 0.11%, 0.27% and 0.41%, respectively, and are applied in a gas diffusion reactor with snakelike flow field for low temperature H 2 -SCR. For Pt 5 MIL-96/CP, the NO removal efficiency can reach up to 100% at 60 °C. Electron transfer between Pt and MIL-96 is observed via X-ray photoelectron spectron (XPS). It reveals that the deposited Pt is in metallic state. Meanwhile, the electronic structure of MIL-96 is kept intact in the process of Pt depositing. The excellent performance of Pt 5 MIL-96/CP catalyst strongly suggests its potential application.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·10953-10967
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IF 4.682
Yang Jie,Li Jia,Yang Ping,Xing Ningning,Chen Yaming,Zuo Min,Li TingTing
Micromotors have gained considerable attention in the field of environmental remediation owing to their self-propulsion motion that can efficiently accelerate the mass transfer and mixing in solution. Herein, we reported a novel Ag/Mg(Ni)Al-layered double hydroxide (LDH) Janus micromotor derived from lotus pollen for dynamic removal of organic pollutant from water. The as-prepared three-dimensional (3D) flower-sphere micromotor was composed of free-standing Mg(Ni)Al-LDH nanosheets half-deposited with Ag nanoparticles. Under the recoil force caused by the oxygen bubbles those were generated via the decomposition of H 2 O 2 catalyzed by Ag nanoparticles, Ag/Mg(Ni)Al-LDHs micromotors could move rapidly with a speed of 115.4 ± 10.3 μm s −1 (≈ 2.2 body lengths s −1 ) in 5 wt% H 2 O 2 . Furthermore, the maximum Congo red (CR) adsorption capacity of Ag/MgAl-LDH micromotor was up to 350.16 mg g −1 , which was 1.33 times greater than the MgAl-LDHs (non-micromotor). Meanwhile, the adsorption rate was significantly accelerated compared to the non-micromotor counterparts. The results show that the enhanced adsorption capacity of micromotor benefited from the combination of 3D porous microstructure with high surface area (209.7 m 2 g −1 ), electrostatic attraction and self-propelled movement. Graphical abstract
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fanlin Kong,Yi liu,Shiyu Cao,Huimin Chen,Yanwei Fan,Junhua Wang,Jincheng Yao,Aimin Chang
In this study, single-phase high-entropy ceramics (HECs) with the composition (Co,Mn,Fe,Zn,Ni,Mg,Al,Cr) 3 O 4 were successfully synthesized using five different types of spinel raw materials. The resulting material demonstrates excellent performance in the negative temperature coefficient (NTC) thermistor field. X-ray diffraction (XRD) analysis confirmed the structure as a cubic spinel with a single Fd-3m space group. The electron microscope image reveals the growth of ceramic grains with increasing sintering temperature, with a uniform distribution of all elements. After 1800 h of accelerated aging at 150 °C, the Δ R / R 0 value was only 0.41 %, indicating the ceramic's exceptional structural stability. X-ray photoelectron spectroscopy(XPS) analysis reveals that electrical conductivity are mainly governed by electron hopping between Mn 3+ and Mn 4+ ions in the octahedral sublattice sites. Impedance spectroscopy further shows that grain boundary resistance is the dominant contributor to the total resistance. This study provides new insights into the synthesis of single-phase HECs materials and proposes strategies to enhance material stability for future applications.
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Materials Today Communications
·
2024
·
IF 3.7
Peihang Shen,Zelong Liu,Yibo Zhang,Zelin Meng,Mingyang Song,Heming Zhao,Jianglei Hu,Fengwei Shi
Vinyl-functionalized SBA-15 was synthesised using a one-pot co-condensation method followed by carboxylation via nitric acid, with the intermediate product named SBA-15C. MIL-68 was then synthesised in-situ by adsorption of Al 3 + ions via carboxylate groups on SBA-15C to give the composite xMIL-68(Al)@SBA-15C. A series of characterizations were conducted by Fourier transform infrared spectroscopy, Brunner-Emmet-Teller measurements, X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscope, and Transmission Electron Microscope. xMIL-68(Al)@SBA-15C maintained robust catalytic performance in the NaBH 4 -mediated reduction of 4-nitrophenol to 4-aminophenol, with no significant decrease in activity after five cycles of reuse.
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Energy Storage Materials
·
2022
·
IF 20.831
Jiaqi Zhu,Dan Cai,Jingru Li,Xiuli Wang,Xinhui Xia,Changdong Gu,Jiangping Tu
Optimization of lithium metal anode is a pivotal part in facilitating the evolution of next-generation high energy density solid-state lithium metal batteries (LMBs). However, the practical application of lithium anode in solid-state LMBs is limited by uncontrollable dendrite growth and the poor interfacial contact with solid electrolyte. Herein, a 40 µm thin lithium composite anode based on the AlN-embedded reduced graphene oxide (rGO) scaffold synthesized via one-step molten lithium infusion is proposed. The resulting lithiophilic Li-Al alloy and high ion-conductive Li 3 N in situ constructed the lithium ion diffusing highways inside electrode, enabling a well-oriented Li deposition and effectively inhibiting the dendrite growth. Combined with in-situ polymerization and Li 3 N-modified solid electrolyte interphase (SEI), the composite anodes can prolong the lifespan of symmetric cell to 2100 h at 0.2 mA cm −2 /0.2 mAh cm −2 in carbonate-based solid polymer electrolytes. Moreover, LAG||LiFePO 4 full cells also excelled in cycling capability and rate performance. This modified electrode offers a promising synergistic solution for designing high-performance solid-state LMBs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Baozhen Li,Jun Zuo,Tiantian Liu,Mengjia Zhu,Kun Jiang,Zhuangzhuang Ren,Hua Yang,Yu Tang,Li Tan,Lizhi Wu
The mildly selective oxidation of methane to oxygenates in the aqueous phase is of great significance for methane upgrade, while it suffers low conversion and multiple oxidation products. Fe-based zeolite, especially Fe/ZSM-5 with heteroatom Al is the most widely investigated catalyst for this reaction, while the Fe supported pure Si-based zeolite without Al is rarely reported. Herein, a series of Fe-S-1 catalysts without introducing heteroatom Al is synthesized via facial dissolution-crystallization method and applied for methane selective oxidation to formic acid. The optimized 0.5Fe-S-1 shows a superior performance with the formic acid space time yield of 49751 µmol·g cat −1 ·h −1 and a liquid-phase formic acid selectivity of 93 % at 70 °C with H 2 O 2 as the oxidant, and present an excellent stability without obvious deactivation after five cycles, which outperforms all previously reported Al-free Fe/Silicalite-1 catalysts, and is comparable with conventional Fe/ZSM-5. Combined with multifarious characterizations including TEM, UV-Vis, Raman, NH 3 -TPD, Py-IR and XAS etc., two kinds of Fe species including the mononuclear tetrahedrally coordinated framework Fe 3+ species and mononuclear octahedral coordinated extra-framework Fe 3+ species are highly dispersed over Fe-S-1 even with a high Fe loading of 1.5 wt%, in which the framework Fe 3+ species content is positively correlated with the catalyst acidity and could provide acid sites to adsorb reactants and then extra-framework Fe 3+ species could activate methane/H 2 O 2 effectively. And the further EPR, in-situ FT-IR characterizations and control experiments demonstrates that the methane selective oxidation to formic acid follows a radical mechanism, in which ·CH 3 combines with ·OH or ·OOH to form CH 3 OH, and then further oxidized to HCOOH and finally over-oxidized to CO 2 .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Weiquan Yuan,Jingzhong Kuang,Dan Ding,Zheyu Huang
Herein, organic/inorganic multiple adsorption sites were constructed on halloysite to intensify the selective adsorption performance of the adsorbent for Al(III) in rare earth solutions. The adsorption heat behavior and thermodynamics of the composite for different ion systems were investigated using microcalorimetry. The results showed that chitosan formed a mesoporous membrane on the acid-treated calcined halloysite (Hal H) substrate through a strong electron interaction between the nitrogen atom of the amino group and the oxygen atom of Si O structure on Hal H. Wurtzite was loaded onto the chitosan mesoporous membrane as nanoparticles and partially oxidized to the ZnO phase of wurtzite. [email protected] demonstrated excellent adsorption capacity ( q max (Al 3+ ) was 102.04 mg/g), selectivity performance (Ks was 1583.06), adaptation to varying ion concentrations and structural stability in the mixed solution. Solution pH, ion concentration and temperature significantly affected the adsorption heat behavior and thermodynamics of the composite in different ion systems. The efficient selective adsorption of Al(III) by [email protected] was achieved through chelation with the amide and amino groups of chitosan and chemical interaction with sulfur groups of wurtzite. This work exemplifies a promising strategy for designing novel mineral materials with strong selective adsorption properties for the separation of Al(III) and rare earth ions.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 2
·497-506
·
IF 2.482
Gao Xiaoxia,Wang Jiang,Xu Aiju,Jia Meilin
4Ni–Al layered double hydroxide (LDH) precursors were prepared by the following three methods: constant pH coprecipitation, variable pH coprecipitation and urea hydrolysis. The 4Ni–Al mixed metal oxide (MMO) catalysts were obtained by the calcination of LDH precursors at 600 °C, and their catalytic performances in ODHP from 350 to 550 °C were tested. The 4Ni–Al MMO from the urea hydrolysis method showed a higher and more stable propylene selectivity of ca. 40% with propylene yield of ca.11% at 500 °C, and that from the constant pH coprecipitation method was followed, while oxidative cracking of propane occurred on the 4Ni–Al MMO from the variable pH coprecipitation method. It is considered to be closely related to the dispersion and stability of the surface Ni(II) species through comprehensive analysis of XRD, N 2 -adsorption-desorption, TEM, XPS, H 2 -TPR and In-situ electrical conductivity. The urea hydrolysis method with a low salt concentration, leading to an excellent stability of the surface Ni(II) species at high reaction temperature, should be selected to prepare Ni–Al MMO catalysts for ODHP instead of the traditional variable pH coprecipitation method with a high salt concentration. Graphic
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Journal of Cleaner Production
·
2020
·
IF 7.246
Shanshan Shao,Xinggang Hu,Wenbin Dong,Xiaohua Li,Huiyan Zhang,Rui Xiao,Yixi Cai
Aldol condensation of biomass-derives coupled with hydrogenation is a promising route for the production of renewable aviation fuel. In this study, a bifunctional catalyst was prepared to integrate the aldol condensation of cyclopentanone and hydroprocessing for aviation fuel in one pot. Due to its strong mild-basic sites, Mg–Al–O performed the best with the total yield of dimer and trimer of 80.4%. Nickel was screened out to be favorable for hydrogenation. Considering the unsatisfactory porous structure of Ni/Mg–Al–O, the bifunctional catalyst was prepared with activated carbon (AC) as carrier. With Ni loading of 20 wt%, the maximum yield of targeted alkanes reached 81.1% over Ni/Mg–Al–O/AC. The calcination and reduction temperature in the preparation process were both optimized at 550 °C. In the reusability test, the yield of targeted alkanes reduced to 31.6% in the 5th run. To attenuate the hydration effect, n-pentane was introduced as solvent, and the bifunctional Ni/Mg–Al–O/AC performed stably in 5 runs. By the design of bifunctional catalyst based on the theoretical basis to realize the integration of C–C coupling and hydrogenation in one pot, it will promote the development of aviation fuel from biomass in a more sustainable and green way.
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CELLULOSE
·
2021
·Vol. 28
·期 13
·8671-8691
·
IF 5.044
Zhao Ningning,Ma Haixia,Yao Ergang,Yu Zhong,An Ting,Zhao Fengqi,Yu Xiaojiao
Al/CuO nanothermites have displayed unique catalytic activities in accelerating the thermolysis of nitrocellulose (NC) and combustion characteristics of AP/HTPB propellant depending on the morphology of CuO. The kinetic triplet of NC-based composites was determined by multi- isoconversional methods, whereas the reaction models were reconstructed by employing a modified Šesták–Berggren equation based on the combined kinetic analysis. DSC and TG-FTIR results revealed that CuO and Al/CuO play crucial roles in accelerating the dissociation of –O–NO 2 bond and the coacervate phase to change the pyrolysis mechanism of NC from an autocatalytic reaction to a modified n -th order reaction model. It was also demonstrated that nanothermites were provided with a low starting temperature of pyrolysis, reduced exothermic peak temperature, low activation energy, and high total weight loss, confirming their better catalytic activity than their corresponding CuO, of which Al/CuO nanothermite, containing the gypsophila paniculata-like CuO, performs the best. Further, the shape of CuO was found to be significant in enhancing the burning rate of AP/HTPB propellant containing thermites, with the gypsophila paniculata-like presenting the best catalytic effect (43% improvement). Hence, introducing well-defined nanostructures is a promising way to improve the pyrolysis and combustion of energetic materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Bingbing Liu,Suying Dong,Peiying Li,Shengpeng Su,Wenjuan Wang,Shuzhen Yang,Yanfang Huang,Hu Sun,Guihong Han
Indium (In) is a typical critical metal, and the recycling of waste In-Tin oxide (ITO) target can alleviate the In resource supply scarcity. The dismantling and preprocessing of waste ITO targets inevitably introduce metallic impurities, posing significant challenges for In recovery, particularly the separation of In from Sn and the removal of other impurities. This study developed an integrated hydrometallurgical process to prepare high-purity nano-In 2 O 3 from high-impurity waste ITO, highlighting on the leaching and separation mechanisms of In, Sn, Al, and Mo. The process consists of HCl leaching for Mo separation, selective sulfide precipitation for In/Sn separation, TOA/TBP synergistic extraction for In/Al separation, and calcination for nano-In 2 O 3 preparation. Under optimal conditions, HCl leaching extracted over 94% of In, Sn, and Al while selectively suppressing Mo dissolution to below 13%. The HCl leaching, sulfide precipitation, and solvent extraction mechanisms are also discussed in this study. The final In 2 O 3 product was 99.98% pure, with about 25 nm average particle size and 77.8% overall In recovery. This work provides an efficient route for high-purity nano-In 2 O 3 production from high-impurity wastes.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Jie Hu,Hui Chen,Ruibin He,Pran Gopal Karmaker,Xiupei Yang,Fenglin Tang
Rapid and sensitive detection of picric acid (PA), a highly toxic and water-mobile nitroaromatic pollutant, is essential for environmental safety and public health protection. Herein, we fabricate a dual-emission ratiometric fluorescent probe by immobilizing high-load red-emitting carbon dots (R-CDs) onto NH₂-functionalized MIL-53(Al), forming an R-CDs/NH 2 -MIL-53(Al) composite for selective aqueous-phase PA sensing. R-CDs were hydrothermally synthesized with citric acid and neutral red as co-precursors. The loading efficiency was maximized by systematically optimizing precursor molar ratios and dilution conditions. The composite exhibits distinct selective fluorescence quenching in the presence of PA. Mechanistic characterizations, including fluorescence lifetime decay measurements and spectral overlap analysis, verify that the fluorescence quenching originates from two synergistic quenching pathways, namely competitive light absorption and fluorescence resonance energy transfer (FRET), rather than nonspecific physical interactions. This ratiometric sensing platform achieves a wide linear detection range of 0.1–70 μM and an ultralow limit of detection (LOD) of 32.9 nM. Spike-and-recovery assays using real environmental water samples (tap water, commercial bottled mineral water, and Jialing River surface water) produced recoveries of 99.7%–105.1%, with relative standard deviations (RSD) below 5.86% ( n = 3). Furthermore, a smartphone-enabled visual quantitative method based on RGB color channel analysis was constructed, enabling portable on-site detection without large-scale laboratory instrumentation.
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高影响因子
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