Materials
·
2019
·Vol. 12
·期 9
·1536
·
IF 2.972
Peng Wang,Qi Sun,Yujiao Zhang,Jun Cao
Zeolite 4A was successfully prepared by hydrothermal synthesis using low-grade kaolin as a raw material. The properties of the synthesized zeolite 4A were characterized by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR),29Si magic-angle spinning (MAS)-nuclear magnetic resonance (NMR) and27Al MAS-NMR, X-ray fluorescence (XRF), scanning electron microscopy (SEM)-energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), thermogravimetry (TG)-differential thermal analysis (DTA), and carbon dioxide adsorption analysis. The textural properties of the synthesized zeolite 4A was further studied by BET analysis technique. The thermal stability analysis showed that the heat resistance of the synthesized zeolite 4A is up to 940 °C. In addition, it is found that the Langmuir model has the best agreement with the adsorption equilibrium data for carbon dioxide by synthesized zeolite 4A and commercial zeolite 4A. Meanwhile, the carbon dioxide adsorption analysis confirmed that the maximum equilibrium adsorption amount of carbon dioxide on synthesized zeolite 4A is 59.3820 mL/g, which is higher than the 55.4303 mL/g of the commercial zeolite 4A.Keywords:kaolin;zeolite 4A;carbon dioxide;adsorption equilibrium
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Peng Wang,Qi Sun,Yujiao Zhang,Jun Cao
The purpose of this study was to synthesize nano-sized zeolite 4A from kaolin obtained from Guizhou New Materials Technology Co., Ltd. The properties of the nano-sized zeolite 4A were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), 29 Si magic-angle spinning (MAS)-nuclear magnetic resonance (NMR) and 27 Al MAS-NMR, X-ray fluorescence (XRF), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), and thermogravimetry (TG)-differential thermal analysis (DTA). According to SEM studies, it can be concluded that the nano-sized zeolite 4A has a typical cubic morphology. TEM images validate that the nano-sized zeolite 4A is of 100–150 nm in size. From the selected-area electron diffraction (SAED) patterns, it is confirmed that these nano-sized zeolite 4A particles have a pure body-center-cubic structure. The textural properties of the nano-sized zeolite 4A were studied by nitrogen adsorption technique, and it can be concluded that the BET surface area of the nano-sized zeolite 4A is 25.131 m 2 ·g −1 . In addition, it is found that the Langmuir model is best suited for the adsorption isotherms of methane on nano-sized zeolite 4A. Meanwhile, the methane adsorption analysis confirmed that the maximum adsorption amount of the nano-sized zeolite 4A to methane increases with the increase of adsorption temperature in the temperature range of 288–318 K.
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
Journal of Ocean University of China
·
2022
·Vol. 21
·期 5
·1237-1243
·
IF 1.179
Hou Jin,Ye Yongcheng
Copper oxide-loaded zeolite 4A nanocomposites (CuO-zeolite NCs) were successfully prepared by modifying zeolite 4A with CuSO 4 aqueous solution as the copper source. Zeolite 4A showed an important role in hosting copper oxide, and CuO-zeolite NCs exhibited a controlled release of copper ions. XRD patterns confirmed the appearance of new diffraction peaks of copper oxide at 35.83° and 38.83°. CuO nanosheets formed on the surface of zeolite 4A were about 30–40nm thick over a width of 200–300nm. CuO-zeolite NCs were primarily composed of Cu, Si, Al and O, as measured by XPS. Cu 2p 3/2 and Cu 2p 1/2 peaks were fitted into two main peaks centered at 934.7eV and 954.6eV, which were attributed to Cu (II). Zeolite 4A and CuO-zeolite NC displayed reversible Langmuir isotherm (type-I) characteristics and showed maximum adsorption quantities of almost 200 cm 3 g −1 at a relative pressure of 1.0 by CO 2 adsorption-desorption experiments. The antibacterial efficiencies of the CuO-zeolite NC were 99.4%, 96.7%, and 96.8% against Pseudoalteromonas tetraodonis ( P. tetraodonis ), Micrococcus luteus ( M. luteus ), and Shewanella putrefaciens ( S. putrefaciens ), respectively. These values showed that nano CuO-loaded zeolite 4A acted as a strong bactericide against marine bacteria. CuO-zeolite NCs can be further applied to marine antifouling coating.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Santosh Khanal,Yunhua Lu,Saad Ahmed,Muhammad Ali,Shiai Xu
The combination of synergistic agent with intumescent flame retardant (IFR) systems provides a promising way to prepare high performance IFR composites. In this study, the effects of the synthetic zeolite 4 A in combination with the IFR system consisting of ammonium polyphosphate (APP) and tris (2-hydroxyethyl) isocynurate (THEIC) on thermal degradation , mechanical properties , flame retardancy and char formation of high-density polyethylene composites were investigated by limiting oxygen index (LOI) measurement, cone calorimetry , scanning electron microscopy and laser Raman spectroscopy . The LOI value of HD/FR/Z-0.5 composite with an optimum content of 0.5 wt. % zeolite 4 A and 25 wt. % of total flame retardant reaches 26.3 %. A low loading of zeolite 4 A can improve the bench-scale combustion performance as determined by cone calorimetry, and promote the formation of more compact char residue with a highly graphitic structure. However, a low loading of zeolite in combination with the IFR system consisting of APP and THEIC produces no significant changes in mechanical performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 29
·期 1
·1-9
·
IF 3.097
Liu Wenfeng,Wang Hao,Zou Liyong,Cai Shaojun,Liu Xueqing,Liu Jiyan,Xie Xianqi
The present work investigated the effects of the zeolite 4A on the flame retardancy and thermal stability of aluminum β-(p-nitrobenzamide) ethyl methyl phosphinate (AlNP) in acrylonitrile–butadiene–styrene copolymer (ABS). The synergistic effect between AlNP and zeolite 4A was assessed with cone calorimeter test (CCT), thermogravimetric measurement (TG), Fourier transform infrared spectroscopy (FTIR) analysis of the gaseous products, and scanning electron microscopy (SEM) characterization of the residues char. Keep the total loading of the additives at 25 wt.%; ABS filled with 22 wt.% AlNP and 3 wt.% zeolite 4A (ABS-AlNP 22 -A 3 ) reaches a UL94 V0 classification with LOI value of 29.3%. By comparison, ABS with 25 wt.% AlNP alone (ABS-AlNP 25 ) only passes the UL 94 V 1 rating with LOI value of 26.0%. CCT results verify that the zeolite 4A can depress the heat and smoke release of combustion. The peak heat release rate, total heat release, and total smoke release of ABS-AlNP 22 -A 3 are reduced by 13.84%, 14.35%, and 20.4%, respectively, compared to ABS-AlNP 25 . The TG/FTIR analysis and morphology of the char residues from scanning electron microscopy further demonstrate that zeolite 4A could retard the volatilization of hydrocarbons and promote the char formation in the combustion process of ABS. The mechanism of synergistic effect of the zeolite 4A is proposed based on the experiment and related previous study.
研究领域:
材料科学
·
燃烧学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Jun Cao,Qi Sun,Peng Wang,Jie Shen,Xue Dai
In order to solve the problem that separating zeolite 4A from solutions, we have synthesized Fe3O4/zeolite 4A magnetic nanocomposite by hydrothermal method. It is characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Vibrating Sample Magnetometer (VSM), scanning electron microscope (SEM) and Brunner-Emmet-teller (BET). The XRD result shows that Fe3O4/zeolite 4A magnetic nanocomposite has a good crystal structure. It also shows that Fe3O4/zeolite 4A magnetic nanocomposite contains two phases of zeolite 4A and Fe3O4 MNP. The optimal sample (Z-2) was judged by the calculation of crystallinity. The successful combination of zeolite 4A and Fe3O4 MNP was visually observed through SEM technology. The functional groups of Fe3O4/zeolite 4A magnetic nanocomposite were characterized by FTIR technology. The TEM result shows that some Fe3O4 MNPs enter zeolite 4A, which further clarifies the microstructure of Fe3O4/zeolite 4A magnetic nanocomposite. N2 adsorption-desorption technique confirms that Fe3O4/zeolite 4A magnetic nanocomposite SBET is 55.3374 m2/g and Dave is 9.7128 nm. VSM result shows that Fe3O4/zeolite 4A magnetic nanocomposite magnetization is 18.4534 emu/g. Simulation experiment shows that Fe3O4/zeolite 4A magnetic nanocomposite exhibit a fast response to an external magnetic field.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
磁性材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）