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  • 1
    Online Resource
    Online Resource
    The Benzylation of p-Xylene Using ZnFe2O4 Nanoparticles as Heterogeneous Catalyst
    Hindawi Limited ; 2022
    In:  Journal of Nanomaterials Vol. 2022 ( 2022-4-4), p. 1-12
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2022 ( 2022-4-4), p. 1-12
    Abstract: In this paper, ZnFe2O4 nanomaterial synthesized in different solvents by hydrothermal method was used as catalyst for the benzylation of p-xylene. ZnFe2O4 catalyst was characterized by XRD, EDX, SEM and nitrogen adsorption/desorption isotherms. The influence of various parameters in the benzylation of p-xylene such as the Fe content of the prepared materials, the ratio molar of p-xylene/benzyl chloride, the catalyst dosage, and the temperature was investigated. The relationship between adsorption kinetics and reaction kinetics of p-xylene benzylation over ZnFe2O4 nanoparticles was discussed. The results indicated that ZnFe2O4 catalyst synthesized in ethylene glycol (ZFO-EG) showed high conversation for the benzylation of p-xylene. The reusability of the ZFO-EG catalyst was also investigated.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2022/6490334
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2229480-6
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  • 2
    Online Resource
    Online Resource
    Single-Atom Ni Heterogeneous Catalysts Supported UiO-66 Structure: Synthesis and Catalytic Activities
    Hindawi Limited ; 2021
    In:  Journal of Nanomaterials Vol. 2021 ( 2021-5-19), p. 1-16
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-5-19), p. 1-16
    Abstract: Herein, the single-atom Ni site heterogeneous catalysts supported by the UiO-66 structure (University of Oslo-66 metal organic framework) were successfully synthesized by a postsynthetic metalation method, where Ni ions are covalently attached to the missing-linker defect sites at zirconium oxide clusters (Zr6O4(OH)4) in as-prepared UiO-66 structure, [Zr6O4(OH)4(BDC)(DMF)10(OH)10] (BDC (benzene-1,4-dicarboxylate), DMF (dimethylformamide)). The structure properties of the catalysts were characterized using powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), N2 adsorption-desorption isotherms (BET), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy (PL). It was found that single-atom Ni heterogeneous catalysts supported by the UiO-66 structure, UiO-66/Ni1.0 [Zr6O4(OH)4(C8H4O4)(DMF)10(OH)8Ni2(OH)2(Cl)2] , showed a sphere-like morphology with a high specific surface area as well as good thermal stability. Specifically, the as-prepared UiO-66/Ni1.0 exhibited the excellent catalytic activity and stability for 4-nitrophenol reduction in terms of low activation energy ( E a = 23.15   kJ   mo l − 1 ), high turnover frequency (76.19 molecules g-1 min-1), and high apparent rate constant ( k app = 0.956 mi n − 1 ). In addition, methylene blue (MB) was also chosen as the organic dye model for catalytic reduction reaction. The k app and TOF for the reduction of MB using UiO-66/Ni1.0 were 0.787 min−1 and 33.89 × 10 20 molecules g−1 min−1, respectively.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    URL: Article
    DOI: 10.1155/2021/6648704
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 3
    Online Resource
    Online Resource
    Effect of solvents on the structure of inorganic – organic hybrid material ZIF-11
    Hanoi University of Science and Technology ; 2021
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 10, No. 1S ( 2021-10-15), p. 201-205
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 10, No. 1S ( 2021-10-15), p. 201-205
    Abstract: In this paper, ZIF-11 materials were synthesized from benzimidazole (BIm) and zinc acetate in different solvent systems at room temperature. The obtained samples were characterized using XRD, SEM, FTIR and TGA measurements and tested for toluene and iodine adsorption ability. The results show that the synthesized materials had nano-size, and uniformity with the sharp rhombic dodecahedrons structure of ZIF-11. The studied solvent systems almost did not affect the crystal size of the materials, but had an small influence on their thermal stability and the toluene adsorption ability. The samples synthesized in methanol-toluene and ethanol-toluene solvent systems had higher thermal stability than those synthesized in ethanol-xylene and ethanol-benzene solvent systems. The obtained materials had high adsorption ability for toluene. Adsorption capacity reached 303.5 mg/g, 306.1 mg/g, 295.6 mg/g and 279.7 mg/g for the materials synthesized in methanol-toluene, ethanol-toluene, ethanol-xylene and ethanol-benzene solvent systems, respectively. The samples also had high adsorption ability for the iodine from aqueous solution and the studied solvent systems almost did not affect iodine adsorption ability of the materials.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2021.122
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Synthesis, characterization, and photocatalytic activity of multicomponent CdMoO〈sub〉4〈/sub〉/g-C〈sub〉3〈/sub〉N〈sub〉4〈/sub〉/GO composite
    Korean Society of Environmental Engineering ; 2023
    In:  Environmental Engineering Research Vol. 28, No. 6 ( 2023-02-28), p. 220649-0
    Details
    In: Environmental Engineering Research, Korean Society of Environmental Engineering, Vol. 28, No. 6 ( 2023-02-28), p. 220649-0
    Abstract: CdMoO 〈 sub 〉 4 〈 /sub 〉 /g-C 〈 sub 〉 3 〈 /sub 〉 N 〈 sub 〉 4 〈 /sub 〉 /GO composites were first synthesized by a hydrothermal process for the photocatalytic degradation of rhodamine B (RhB) under visible light illumination. The findings show that CdMoO 〈 sub 〉 4 〈 /sub 〉 is highly dispersed onto g-C 〈 sub 〉 3 〈 /sub 〉 N 〈 sub 〉 4 〈 /sub 〉 and graphene oxide (GO) sheets. The surface area of the composite increased 27–30.5 times that of CdMoO 〈 sub 〉 4 〈 /sub 〉 , and its band gap energy decreased by about 1.26 times. These features significantly improve the photocatalytic activity of the composite in the RhB decomposition reaction under visible light. The RhB degradation efficiency of the CdMoO 〈 sub 〉 4 〈 /sub 〉 /g-C 〈 sub 〉 3 〈 /sub 〉 N 〈 sub 〉 4 〈 /sub 〉 /GO composite is 5.7, 1.36, and 1.65 times that of CdMoO 〈 sub 〉 4 〈 /sub 〉 , CdMoO 〈 sub 〉 4 〈 /sub 〉 /g-C 〈 sub 〉 3 〈 /sub 〉 N 〈 sub 〉 4 〈 /sub 〉 , and CdMoO 〈 sub 〉 4 〈 /sub 〉 /GO composites, respectively. The active species trapping experiments show that the main forms in RhB degradation are •O 〈 sub 〉 2 〈 /sub 〉 〈 sup 〉 – 〈 /sup 〉 , •OH, and 〈 i 〉 h 〈 /i 〉 〈 sup 〉 + 〈 /sup 〉 . The stability of the photocatalyst is retained even after the 5th reuse. In addition, RhB degradation products were identified with the high-performance liquid chromatography-mass spectrometry method, and the pathway of photocatalytic degradation was also addressed.
    Type of Medium: Online Resource
    ISSN: 1226-1025 , 2005-968X
    URL: Article
    DOI: 10.4491/eer.2022.649
    Language: English
    Publisher: Korean Society of Environmental Engineering
    Publication Date: 2023
    detail.hit.zdb_id: 2976690-4
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  • 5
    Online Resource
    Online Resource
    Synthesis of ZIF-67- Effect of solvent on the structure
    Hanoi University of Science and Technology ; 2021
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 10, No. 1 ( 2021-11-25), p. 98-103
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 10, No. 1 ( 2021-11-25), p. 98-103
    Abstract: In the present paper, ZIF-67 material was synthesized from cobalt (II) nitrate hexahydrate and 2-methyl imidazole in three different solvents (methanol, ethanol and acetone) at room temperature. The obtained samples were characterized using XRD, SEM, FTIR, TGA and nitrogen adsorption/desorption measurements. The results show that the synthesized ZIF-67 materials had a high purity, nano-size, and uniformity with the sharp dodecahedrons structure of ZIF-67. Solvents had an influence on the size and nature of the ZIF-67 crystal. The average crystalline size of the nanoparticles calculated by Scherrer equation were 64 nm for sample in acetone solvent, 128 nm for sample in ethanol solvent and 132 nm for sample in methanol solvent. The obtained samples had high thermal stability ( 320 °C). The ZIF-67 material with ethanol solvent had a high specific surface area (SBET) of 1506 m2/g. The synthesized samples exhibited better adsorption capacity of methyl oranges than that of rhodamine B.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2021.016
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Synthesis of ZnMn2O4 nanostructure via hydrothermal method
    Hanoi University of Science and Technology ; 2020
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 9, No. 3 ( 2020-10-02), p. 58-62
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 9, No. 3 ( 2020-10-02), p. 58-62
    Abstract: In this study, the spinel-type ZnMn2O4 material was successfully synthesized via hydrothermal method. Several factors influencing the synthesis of material such as Zn/Mn mole ratio, hydrothermal temperature and calcination temperature were studied. The characterization of expected samples using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR), surface area analysis (BET) was conducted. The XRD results indicated that the highly ordered crystalline form of spinel ZnMn2O4 was synthesized in the conditions: Zn/Mn mole ratio of 1:2, hydrothermal temperature of 120 °C, hydrothermal time of 24 h and calcination temperature of 500 °C.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2020.050
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2020
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  • 7
    Online Resource
    Online Resource
    TỔNG HỢP VÀ ĐẶC TRƯNG VẬT LIỆU NANO ZnFe2O4
    Hue University ; 2022
    In:  Hue University Journal of Science: Natural Science Vol. 131, No. 1C ( 2022-09-30), p. 133-138
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 131, No. 1C ( 2022-09-30), p. 133-138
    Abstract: Trong nghiên cứu này, vật liệu nano ZnFe2O4 được tổng hợp thành công bằng phương pháp thủy nhiệt kết hợp với nung. Các yếu tố ảnh hưởng đến quá trình tổng hợp vật liệu như thời gian thủy nhiệt, nhiệt độ thủy nhiệt và nhiệt độ nung đã được khảo sát. Vật liệu tổng hợp được đặc trưng bằng phương pháp nhiễu xạ tia X (XRD), hiển vi điện tử quét (SEM), phổ hồng ngoại (FT-IR) và hấp phụ/khử hấp phụ ni tơ (BET). Kết quả cho thấy tinh thể spinel ZnFe2O4 có trật tự cao được tổng hợp ở nhiệt độ thủy nhiệt 120 °C, thời gian thủy nhiệt 24 h và nhiệt độ nung 500 °C.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueunijns.v131i1C
    DOI: 10.26459/hueunijns.v131i1C.6326
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2022
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  • 8
    Online Resource
    Online Resource
    Rosin used as a potential organic precursor in synthesis of blue pigment for ceramic
    Elsevier BV ; 2022
    In:  Materials Chemistry and Physics Vol. 280 ( 2022-03), p. 125840-
    Details
    In: Materials Chemistry and Physics, Elsevier BV, Vol. 280 ( 2022-03), p. 125840-
    Type of Medium: Online Resource
    ISSN: 0254-0584
    URL: Article
    DOI: 10.1016/j.matchemphys.2022.125840
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 1491959-X
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  • 9
    Online Resource
    Online Resource
    Kinetics of 4‑nitrophenol reduction with NaBH〈sub〉4〈/sub〉 over Ag/CuO nanomaterial catalyst
    Vietnam Association of Catalysis and Adsorption ; 2024
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 12, No. 4 ( 2024-03-09), p. 153-159
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Vietnam Association of Catalysis and Adsorption, Vol. 12, No. 4 ( 2024-03-09), p. 153-159
    Abstract: In this paper, Ag/CuO nanomaterials were prepared via hydrothermal method combined with chemical reduction and used as catalysts in the reduction of 4-nitrophenol. Kinetic study of 4-nitrophenol (4-NP) reduction into 4-aminophenol (4-AP) by sodium borohydride revealed a first order reaction. The reaction rate constant k increased with amount of silver crystals introduced into CuO nanosheets, with Ag/CuO catalyst concentrations and with temperature. The thermodynamic activation parameters such as activation energy (Ea), enthalpy of activation (∆H#), entropy (∆S#) and Gibbs energy (∆G#) of activation were determined. The value of Ea, ∆H#, ∆S# and ∆G# were 72,33 kJ/mol, –69,86 kJ/mol, –24,28 J/K.mol and –62,50 kJ/mol (303K), respectivement. Ethanol and isopropanol were able to inhibit the 4-NP reduction with NaBH4 in the presence of Ag/CuO catalyst.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.62239/jca.2023.079
    Language: English
    Publisher: Vietnam Association of Catalysis and Adsorption
    Publication Date: 2024
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  • 10
    Online Resource
    Online Resource
    Synthesis of CuO nanosheets via hydrothermal method
    Hanoi University of Science and Technology ; 2021
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 11, No. 1 ( 2021-08-20), p. 73-78
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 11, No. 1 ( 2021-08-20), p. 73-78
    Abstract: In this paper, CuO nanosheets were successfully synthesized by a simple hydrothermal method. The synthesized CuO nanosheets were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR), surface area analysis (BET). Several factors influencing the synthesis of material such as concentration of NaOH, hydrothermal temperature and hydrothermal time were studied. Scanning electron microscopy (SEM) investigation reveals that CuO nanosheets have the length of about 500 - 1000 nm. N2 adsorption–desorption isotherm experiment shows that the BET specific surface area of obtained CuO nanosheets is 12.78 m2/g.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2022.011
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2021
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