NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 14
·6720-6728
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IF 3.925
Jie Shen,Qi Sun,Jun Cao,Peng Wang,Weilin Jia,Suyang Wang,Ping Zhao,Zepeng Wang
Zeolite LTA, with high porosity and uniform pore distribution, has been widely used in the gas adsorption field. In this paper, a 1.38 nm thick two-dimensional zeolite LTA was synthesized from kaolin, changing the cubic morphology of the traditional zeolite LTA. SEM and TEM images showed that the zeolite LTA exhibited a lamellar structure. In a comparative experiment with CO2 adsorption at different temperatures, the 2D zeolite LTA with a large specific surface area could capture more CO2 than the conventional 3D zeolite LTA. In addition, the CO2/CH4 selectivity of the 2D Zeolite LTA was 76.78 at 298 K.
研究领域:
材料科学
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环境科学
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高影响因子
Coatings
·
2024
·Vol. 14
·期 12
·1524
·
IF 2.9
Jiayuan Yang,Jixing Cui,Haiping Zhang,Hui Zhang,Jesse Zhu
Antibacterial powder coatings have attracted increasing attention with the awakening of people’s health awareness. Silver antibacterial agent has been widely used in coating system due to its superior stability and durability. However, silver ions have the problems of excessive release rate and the tendency to cause yellowing of the coating film. The addition of Cu2+and Zn2+can effectively alleviate these two phenomena. In this paper, the ternary exchange kinetics of Ag+, Cu2+, and Zn2+were studied to provide a theoretical basis for the synthesis of LTA-Ag-Cu-Zn. The reaction kinetics study shows that the selectivity and the adsorption capacity of LTA to Ag+is higher than that of Cu2+and Zn2+. The thermodynamic analysis discovers that LTA has the highest selectivity for Ag+, and the exchange between the two is spontaneous. In contrast, the selectivity of LTA to Cu2+and Zn2+is concentration-dependent. By establishing the three-ion competitive adsorption curve, it is found that the selectivity of Ag+is the highest, and the selectivity of copper and zinc is similar. These trends result from Ag+ions’ low hydration energy, small hydration radius, and strong electronegativity. This research lays the groundwork for developing high-performance LTA-Ag-Cu-Zn tri-ion exchange antibacterial agents.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2016
·
IF 5.557
Kai Xu,Chenfang Yuan,Jürgen Caro,Aisheng Huang
In the present work, we report a new road to enhance the gas separation performances of the zeolite Na-LTA membrane by tuning the pore size of zeolite LTA through silver cation exchange. Through the functionalization of the alumina support by using 3-aminopropyltriethoxysilane (APTES), a thin, phase-pure and well intergrown zeolite Na-LTA membrane with a thickness of about 5.0 µm can be facilely prepared on the APTES-modified macroporous α-Al 2 O 3 tube. After a following silver exchange treatment of the as-synthesized zeolite Na-LTA membranes, the sodium ions in zeolite Na-LTA framework are replaced by silver ions , thus forming zeolite Ag-LTA membranes with a narrower pore diameter. The zeolite Ag-LTA membranes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). It is found that both the morphology and structure of the zeolite Na-LTA membrane keep unchanged after silver-exchange, and no cracks, pinholes or other defects are observed in the membrane layer. The zeolite Ag-LTA membrane shows high hydrogen selectivity due to the reduction of pore size of the zeolite Ag-LTA. For the separation of the binary mixture at 50 °C and 2.0 bar, the separation factor of H 2 /C 3 H 8 is α≈120.8, which by far exceeds α≈19.4 of the starting Na-LTA membrane, and are also much higher than the separation factors previously reported for the H 2 /C 3 H 8 mixture on zeolite membranes.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2018
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IF 1.2
Kai Xu,Haiming Jin,Linfang Wang,Yi Liu,Chen Zhou,Jürgen Caro,Aisheng Huang
A seeding-free synthesis method is developed for preparation of oriented zeolite LTA membranes by using 1,4-phenylene diisocyanate (PDI) as a molecular linker. Before hydrothermal synthesis, –NCO groups are introduced with the functionalization of Al2O3 supports by PDI. A thin, well intergrown zeolite LTA membrane with a thickness of about 4.0 µm can be formed on the PDI-modified Al2O3 supports. The zeolite LTA membrane displays high pervaporation performances for dehydration of alcohols. At 90°C, the separation factor of the zeolite LTA membrane is 4480 for dehydration of 95 wt% ethanol/water mixtures, with a high water flux of 3.4 kg·m−2·h−1.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2015
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IF 1.098
Guo Lin,Qiang Zhuang,Qun Cui,Haiyan Wang,Huqing Yao
Co-crystalline zeolite FAU/LTA-0 was synthesized by hydrothermal method from lithium slag. To make the most of excess silicon and alkali sources in mother liquid derived from FAU/LTA-0, zeolite FAU/LTA-1b was synthesized in the same method with the use of mother liquid by adding a certain amount of aluminum source. Influences of different adding ways of aluminum source and recycling dosages of mother liquid on synthesis of zeolites FAU/LTA with mother liquid were investigated. The phase, microstructure and thermostability of FAU/LTA-0 and FAU/LTA-1b were characterized by XRD , SEM and TG-DTA. The calcium and magnesium cation exchange capacities (CECs) of the zeolites were determined. The results have shown that co-crystalline zeolite can be synthesized with the use of mother liquid by adding aluminum source after 2 h of reaction. Compared with FAU/LTA-0, the crystal twinning structure of FAU/LTA-1b became weaker, the grain size was smaller, and the thermostability was better. With a lower dosage of mother liquid, the content of P-type impurity in product decreased significantly, and the content of LTA phase increased. The reuse rate of mother liquid can reach 48%. The CECs of FAU/LTA-1b-150 can reach 343 mg CaCO 3 ·g − 1 and 180 mg MgCO 3 ·g − 1 , showing more excellent adsorption capacities than FAU/LTA-0 and commercial zeolite 4A. The full recycling use of mother liquid to synthesize zeolite FAU/LTA which can be applied for detergent not only improves resource utilization but also reduces production cost.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qian Zheng,Ziwei Wang,Zhouyang Tian,Lin Cai,Chengfeng Jiang,Lili Deng,Dazhong Yang,Zhenhua Wei
This study introduces a novel and green solid-phase activization technology, which could significantly enhance the chemical reactivity of Si and Al species within kaolinite for zeolite synthesis. Based on this technology, a cost-free kaolinite-rich soil is successfully transformed into A-type zeolite (LTA), a famous and highly productive commercial zeolite. Specifically, solid-phase activization only comprises a green solid-phase ageing step at room temperature and a straightforward heating step at 100°C, showing a progressive activization characteristic. Firstly, the aluminosilicates are fully encapsulated and eroded by the deliquescent NaOH colloids during solid-phase ageing process, occurring preliminary depolymerization. Then upon heating operation, the depolymerization strength of aluminosilicates would be dramatically enhanced, transforming most original Q 3 Si and Al VI species within the soil into Q 0 , Q 1 Si, and Al IV species that are highly desired for zeolite synthesis. Finally, through conventional hydrothermal reaction, the activizated soils could be seamlessly converted into LTA. Compared to the current activization technologies, solid-phase activization exerts superior advantages in terms of activization efficacy, NaOH consumption, energy expenditure, and equipment requirements. Overall, this work shows a novel activization approach for greener aluminosilicate depolymerization and cost-effective LTA synthesis. More remarkably, it significantly broadens the diversity and source options of Si and Al raw materials for zeolite preparation, profoundly enhancing the application potential of silica-alumina minerals within soil and fostering a vast horizon for industries reliant on activizated Si and Al species.
研究领域:
材料科学
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化学工程
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矿物学
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DOI
高影响因子
RSC Advances
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2023
·Vol. 13
·期 5
·3364-3370
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IF 3.9
Yuying Jiang,Yifeng E,Pengyan Wei,Jia Wang,Peng Chen,Lei Wang,Thomas F. Krenzel,Kun Qian,Xiyuan Tong
An electrochemical method based on a Linde Type-A zeolite-modified glass carbon electrode (LTA/GCE) was introduced for the determination of retinoic acid (RA). LTA zeolite could be synthesized through a hydrothermal method and served as a commercial electrochemical sensor with high stability and sensitivity in electrochemical progress. The as-synthesized product was characterized by scanning electron microscopy (SEM), differential thermal analysis (DTA), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Under optimal conditions, a detection limit of 0.8 μM was obtained for RA with a linear range of 0.8–20.1 μM. This electrochemical method for determining RA was simpler and cheaper than previously reported methods. Furthermore, the modified electrode could be applied to the detection of RA in tap water, achieving a linear range of 1.4–15.0 μM with a detection limit of 1.4 μM and good recovery. The modified electrode designed by this method provided good selectivity, stability, and reproducibility for RA determination and reliable application for the analysis of RA in environmental water.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Kun Qian,Fang Fang,Yifeng E,Yao Xu,Xiyuan Tong,Peng Chen,Lu Han,Zhuozhe Li
One of the important factors determining the expansion of the application domain of direct methanol fuel cell (DMFC) is its energy density . The bismuth-nickel doped LTA zeolite was as-synthesized in hydrothermal condition and applied into the electrochemistry catalysis of methanol oxidation reaction (MOR) with high performance in the methanol concentration ranging from 0.5 M to 35 M without observed catalyst poisoning . A trace amount of Bi and Ni atoms are highly dispersed on the opening window of the zeolitic surface by the electrochemical rearrangement process. The surface of the LTA structure zeolite is a good carrier for the metal cations with Na cations which could be replaced in hydrothermal crystalline process while the inner direct pores provide a channel for CO gas to escape and prevent catalyst poisoning in electrochemistry progress. Through the comparative study with the Bi doped LTA, Ni doped LTA and the commercial Pt/C catalyst, the Bi and Ni doped LTA reveals higher performance in monatomic catalytic efficiency and electrochemical stability. And through the mutual interaction of diatomic, the doped zeolite material highly improves the energy density of methanol fuel cells and reduces the cost of the cells concerning the absence of noble metals.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Shangqing Qu,Guohong Cai,Xianji Qiao,Guobao Li,Junliang Sun
The incorporation of ceramic fillers into polymer electrolytes has proven to be effective in bolstering their mechanical robustness, improving ionic transport efficiency, and ensuring enhanced interface integrity. Nonetheless, the current repertoire of suitable ceramic fillers for such applications is still somewhat limited. Zeolites, renowned for their pronounced adsorption capabilities and potential as sodium-ion conductors, have not been extensively studied regarding their impact on the electrochemical performance of composite electrolytes. In this work, we have developed a novel composite polymer electrolyte (CPE) based on poly(ethylene oxide) (PEO) integrated with LTA zeolite nanoparticles. The cation adsorption on the surface of LTA zeolite particles introduces additional ion migration pathways, while the interaction between hydroxyl groups and ether atoms of the PEO matrix weakens the coordination between Na+ and PEO, thereby promoting sodium-ion mobility within the LTA/PEO CPE. The synergistic effect of cation adsorption and Lewis acid–base action on the zeolite surface yields an impressive sodium-ion transference number of 0.44. The integration of the LTA zeolite into the composite electrolyte diminishes the interfacial resistance against sodium metal electrodes, effectively mitigating sodium dendrite formation. The NVP||PEO-10||Na battery incorporating 10 wt % LTA zeolites exhibits a capacity retention of nearly 88% after 100 cycles at 0.2 C, which is significantly better than those without the zeolite.
研究领域:
材料科学
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电化学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2024
·
IF 4.3
Ling Pan,Song Ye,Ruihao Huang,Meiyan Wang,Tianning Zheng,Haoran Zhang,Deping Wang
Luminescent silver clusters that are confined inside porous zeolites have attracted great research interest due to the combined advantages of high quantum yield, tunable emission, excellent chemical stability, and desirable adoption ability of this micronano-composite. In this research, a series of Ag-exchanged R-LTA/Ag (R = Li, Na, K) zeolites were synthesized, in which the silver clusters showed blue-shifted excitation in the UV region, red-shifted emission in the visible region, and decreased emission intensity when taking Li+, Na+, and K+ as the extra-framework cations, respectively. The [Ag4(H2O)xR4-sod]6– (x = 2, 4; R = Li, Na, K) structures were constructed, and the TD-DFT method was further carried out to study the influence of extra-framework cations on the luminescence performance of [Ag4]2+ clusters, in which the substitution of Al for Si and the reasonable hydrate levels were both taken into consideration. It is estimated that the S1 and S3 levels for the [Ag4(H2O)4Li4-sod]6– cluster, the S4 level for the [Ag4(H2O)4Na4-sod]6– cluster, and the S5 level for the [Ag4(H2O)2K4-sod]6– cluster can be effectively populated through direct excitation, and the S1 → S0 transition is assumed to be responsible for the radiative emission in the visible region for the [Ag4]2+ pseudo-tetrahedrons. This calculated energy level diagram and simulated absorption spectra of [Ag4(H2O)xR4-sod]6– (x = 2, 4; R = Li, Na, K) clusters explained the modified luminescence property of silver clusters in R-LTA/Ag (R = Li, Na, K) zeolites studied in this research and reported literature.
研究领域:
材料科学
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光物理学
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理论化学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
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IF 4.908
Bingxin Huang,Qian Liu,Jürgen Caro,Aisheng Huang
Dense and phase-pure zeolite LTA membranes were hydrothermally synthesized on 3-aminopropyltriethoxysilane (APTES)-modified macroporous Al 2 O 3 tubes without seeding. Pervaporation experiments were conducted for the separation of liquid water/iso-butanol and water/ethanol mixtures to evaluate the separation performances of the zeolite LTA membranes. A water flux of 4.5 kg/m 2 h is obtained at 100 °C for the separation of a 95.0 wt% iso-butanol/5.0 wt% water mixture, and the separation factors of water/iso-butanol are found to be about 3000 for all temperatures and concentrations studied.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·11051-11062
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IF 3.3
Chengzhi Hu,Changyan Zhou,Huiping Zhang,Ying Yan
Chemical vapor deposition (CVD) and impregnation (IM) methods were applied in the preparation of novel Fe/LTA (Linde Type A) zeolite membrane/paper-like sintered stainless steel fiber (Fe/LTA/PSSF) catalysts for acetone oxidation. The catalysts were characterized using various techniques, such as actual iron loading (AAS), surface morphology (SEM), phase composition and crystallite size (XRD), specific surface area (BET), valence state (XPS) and reducibility (H2-TPR), to investigate the effects of the calcination process, iron loading, preparation methods and supports on their catalytic activity. The calcined catalysts were more active than the non-calcined catalysts in the catalytic oxidation of acetone due to the different oxidation states of the deposited metal species. The catalysts prepared by CVD with an Fe loading of 2.29% exhibited similar activity to the IM-prepared catalysts with Fe loadings of 4.42% and 9.69%, which may be attributed to the superior dispersion of the active Fe2O3 phases, the smaller size of metal oxide and the increased ability for oxygen storage. Among the IM-prepared catalysts, Fe/LTA/PSSF-IM-2 with an Fe loading of 4.42% exhibited the lowest T90 of 230 °C. Additionally, the catalysts coated on LTA/PSSF showed higher activity and contact efficiency (T90 of 249 °C) compared to those on granular zeolite (T90 of 318 °C).
研究领域:
催化化学
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环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）