APPLIED CLAY SCIENCE
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2023
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IF 5.6
Jiwen Si,Ruifeng Guo,Yan Zhang,Weikun Ning,Yanbin Sun,Wenqing Li,Shiding Miao
The Linde A-Type zeolite (LTA zeolite) was synthesized from ball clay through two steps of calcination at 600 °C with the addition of NaOH/Al(OH) 3 in a mass ratio of 1:1.2/0.43 and hydrothermal treatment at 60 °C for 48.0 h. A certain amount of 3.0 wt% Ru 3+ was introduced before the hydrothermal treatment, and the Ru 0 -nanoparticles were in-situ fixed in the zeolite in a facile way. The synthesized materials were characterized by X-ray diffraction, infrared spectroscopy , field-emission scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. The zeolite with LTA structure was successfully synthesized from ball clay, and the catalytic performance was checked by using hydrogenation of benzene at 150 °C and P H2 = 5.0 MPa, and the turnover frequency (TOF) of cyclohexane reached 4000 mol/(mol·h). The good stability was demonstrated by the high conversion of 94.0% and 98.0% of benzene after cycling use for many runs of catalysis and calcination at 550 °C.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Chen Zhang,Duoyong Zhang,Xinqi Zhang,Xiaoou Chen,Linrui Chen,Yongqiang Tian,Liwei Wang
Materials with tunable properties are crucial for mitigating CO 2 emissions. Here, uniform and well-structured porous Rubik’s cube-shaped Linde type A (LTA) zeolites are synthesized for CO 2 capture, representing advancement in eco-friendly and cost-effective materials. The synthesis procedure extracts melting silicon from silicon-rich biomass ashes, followed by template-free hydrothermal synthesis. The melting approach is proposed to collect silicon for high hydroxide anion concentration and outstanding flowability, accelerating reaction kinetics and yielding alkaline silicon-containing solutions to promote crystallization of zeolites. These zeolites possess CO 2 sorption capacity (2.97 mmol/g at 1 bar and 298 K) and selectivity for CO 2 /N 2 (around 255.1), influenced by ultramicropores with heterogeneous surfaces containing metal ions. Cyclic robustness during vacuum temperature swing cycles displays a low attenuation rate (approximately 7.7% over 20 cycles). Thus, Rubik’s cube-shaped LTA zeolites are a promising and cost-effective approach to addressing CO 2 capture challenges by leveraging readily available biomass materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
POWDER TECHNOLOGY
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2019
·
IF 3.413
Xinping He,Bing Yao,Yang Xia,Hui Huang,Yongping Gan,Wenkui Zhang
A novel efficient Ni 2+ adsorbent A-type zeolite is successfully synthesized. It is worth noting that the raw material used is the waste coal ash produced by local power plants. The ability of A-type zeolite to remove Ni 2+ from wastewater is up to 94%. In the study, the physical properties of zeolite are systematically characterized. In addition, we study in detail the effect of the external environment on the adsorption capacity of A-type zeolite. Moreover, the pseudo secondary kinetic model and Langmuir isothermal model evaluate the kinetic performance and isothermal equilibrium adsorption ability are better. The synthetic zeolite not only effectively uses the coal fly ash, but also realizes the sewage recycling. Therefore, the use of power plant coal fly ash to make adsorbent zeolite has potential practical significance.
研究领域:
环境科学
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材料科学
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废物管理
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
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IF 7.8
Yidan Luo,Huiming Wang,Wenjun Zeng,Zugen Liu,Xianchuan Xie
The management of alum sludge in waterworks has received a large amounts of attention. Considering its high aluminum and silicon content, alum sludge holds great potential as a low-cost raw material for zeolite synthesis to decrease the waste disposal. Alum sludge was utilized to synthesize zeolite A via both fusion-hydrothermal (Fusion-HT) and conventional hydrothermal methods. The synthesis parameters were explored including the Si/Al ratio, the calcination temperature, NaOH amounts, and hydrothermal temperature and time. The zeolite A prepared with Fusion-HT method exhibited a relative crystallinity of 93.15 % and a specific surface area of 128.01 m 2 /g. In adsorption experiments, zeolite A demonstrated excellent maximum adsorption capacities according to the Langmuir model for Cd 2+ , Cu 2+ , NH 4 + , and PO 4 3- , reaching 103.324, 93.899, 38.461, and 6.062 mg/g, respectively. Influential factors such as adsorbent dosage, pH, and humic acid (HA) were investigated. Zeolite A revealed optimal adsorption pH for various ions: Cu 2+ and Cd 2+ exhibited maximum removal efficiencies at pH 3–7, NH 4 + achieved peak adsorption capacity at pH 4–7, and PO 4 3- showed the highest adsorption efficacy at pH 4–6. Besides, the removal trends of Cd 2+ , NH 4 + , and PO 4 3- were negatively correlated with the HA concentration, while the removal rates of Cu 2+ increased first and then decreased. The different removal mechanisms were identified for Cd 2+ , Cu 2+ , NH 4 + , and PO 4 3- . Additionally, zeolite A could be regenerated with over 90 % of Cd 2+ removal efficiency after five cycles, highlighting its great potential in the treatment of urban non-point source pollution.
研究领域:
环境工程
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材料科学
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水污染控制
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吸附技术
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废弃物资源化利用
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产品关联
DOI
高影响因子
Acta Biomaterialia
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2022
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IF 10.633
Zhixuan Huang,Kun Qian,Jin Chen,Yao Qi,Yifeng E,Jia Liang,Liang Zhao
Zeolite-based nanomaterials have a large number of applications in the field of medicine due to their high porosity, biocompatibility and biological stability. In this study, we designed cerium (Ce)-doped Linde Type A (LTA) zeolite-based nanomaterials (Ce/Zeo-NMs) as a multifunctional mesoporous nanoenzyme to reduce dysfunction of the neurovascular unit (NVU) and attenuate cerebral ischaemia-reperfusion (I/R) injury. Owing to its unique adsorption capacity and mimetic catalytic activities , [email protected] adsorbed excess zinc ions and exhibited scavenging activity against reactive oxygen species (ROS) induced by acute I/R, thus reshaping the oxidative and zinc microenvironment in the ischaemic brain. In vivo results demonstrated that [email protected] significantly reduced ischaemic damage to the NVU by decreasing the infarct area, protecting against breakdown of the blood–brain barrier (BBB) via inhibiting the degradation of tight junction proteins (TJPs) and inhibiting activation of microglia and astrocytes in a rat model of middle cerebral artery occlusion-reperfusion (MCAO/R). Taken together, these findings indicated that [email protected] may serve as a promising dual-targeting therapeutic agent for alleviating cerebral I/R injury. Statement of Significance Cerium (Ce)-doped Linde Type A zeolite-based nanomaterials (Ce/Zeo-NMs) as a multifunctional mesoporous nanoenzyme were designed for inducing neuroprotection after ischaemic stroke by reducing dysfunction of the neurovascular unit (NVU). [email protected] had the ability to adsorb excessive Zn 2+ and showed mimetic enzymatic activities . As a result, [email protected] protected against cerebral ischaemia and reduced the damage of NVU by improving the integrity of blood brain barrier (BBB) and inhibiting activation of microglia and astrocytes in a rat model of middle cerebral artery occlusion-reperfusion (MCAO/R). These findings indicated that [email protected] may serve as a therapeutic strategy for neuroprotection and functional recovery upon ischaemic stroke onset.
研究领域:
神经科学
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纳米技术
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生物医学工程
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药理学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
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2013
·Vol. 43
·期 7
·2810-2818
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IF 3.806
Ji-Na Hao,Bing Yan
Eight host–guest assemblies of zeolite A (ZA) and their thin films have been synthesized. The assembly of zeolite A was prepared by first embedding lanthanide complexes (Eu(TTA)n or Tb(TAA)n) into the cages of zeolite A and then grafting lanthanide complexes (Eu(L) or Tb(L), L = bipy or phen) onto the surface of functionalized zeolite A via 3-(methacryloyloxy)propyltrimethoxysilane (γ-MPS). The obtained organic–inorganic hybrid materials were investigated by means of XRD, FT-IR, SEM and luminescence spectroscopy. Firstly, the dependence of the crystal stability of zeolite A as the host of lanthanide complexes on the level of ion exchange was studied by XRD. The results indicated the degradation and partial collapse of zeolite A framework occurred upon doping with high amounts of lanthanide complexes into its channels. The integrity of zeolite A’s framework was well maintained after fabrication through careful control of the ion-exchange extent. Secondly, the thin films of zeolite A assemblies obtained this way have the properties of homogeneous dense packing and a high degree of coverage of the crystals on the ITO glass, as shown in SEM images. Thirdly, the luminescence behavior of all the materials were investigated in detail. Among them, four white light-emitting materials from a three-component system that comprises a blue-emitting zeolite A matrix, a red-emitting europium complex and a green-emitting terbium complex were obtained.
研究领域:
材料科学
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无机化学
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物理化学
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纳米技术
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光学材料
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配位化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）