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  • Hanoi University of Science and Technology  (7)
  • 1
    Online Resource
    Online Resource
    Photocatalysis degradation of 2,4-dichlorophenoxyacetic acid in water environment using synthesized TiO2 nanoparticles
    Hanoi University of Science and Technology ; 2022
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 11, No. 3 ( 2022-10-12), p. 43-47
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 11, No. 3 ( 2022-10-12), p. 43-47
    Abstract: The present study investigated the photodegradation of 2,4-Dichlorophenoxyacetic acid (2,4-D) in a water environment using synthesized titania nanoparticles (TiO2-NPs). The TiO2-NPs fabricated by sol-gel method were distinguished by X-ray diffraction (XRD) and Transmission electron microscopy (TEM), Infrared spectroscopy (IR), and zeta potential measurements. The results indicated that TiO2 - NPs were nanospheres of appropriately 30nm with a major anatase phase. Synthesized TiO2-NPs have the point of zero charge (PZC) of around 6.0. The efficient conditions for photocatalysis degradation of 2,4-D under sunlight were considered and found to be 120 min, pH 11, and 1 mM KCl. Under ideal conditions, the photodegradation efficiency of 2,4-D reached greater than 72 %. Our results suggest that TiO2-NPs would be promisingly applied for eliminating 2,4-D from an aqueous solution.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2022.048
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Adsorption characteristics of 2,4-dichorophenoxy acetic acid onto surfactant modified titania nanoparticles
    Hanoi University of Science and Technology ; 2021
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 10, No. 4 ( 2021-08-23), p. 1-5
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 10, No. 4 ( 2021-08-23), p. 1-5
    Abstract: The present study investigated adsorption of 2,4-dichorophenoxy acetic acid (2,4-D) on titania (TiO2) nanoparticles with surface modification by cationic surfactant, cetyltrimethylammonium bromide (CTAB). Titania nanoparticles which were successfully synthesized by sol-gel method, were characterized by X-ray diffraction (XRD) and Transmission electron microscopy (TEM). Surface modification of TiO2 with CTAB enhanced the removal of 2,4-D significantly. Some effective conditions affect to the removal of 2,4-D using CTAB modified TiO2 such as pH and adsorbent dosage were systematically studied and found to be 5 and 10 mg/mL, respectively. Adsorption mechanisms of 2,4-D onto CTAB modified TiO2 was suggested based on the change in surface charge after adsorption.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2021.061
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2021
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  • 3
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    Online Resource
    Preparation of zero valent iron nanomaterial via microfluidic device for Cr (VI) ion treatment
    Hanoi University of Science and Technology ; 2020
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 9, No. 1 ( 2020-04-30), p. 123-128
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 9, No. 1 ( 2020-04-30), p. 123-128
    Abstract: In this study, iron nanomaterial was synthesized by a reaction between FeCl3 and NaBH4 using microfluidic device as a microreactor which is prepared by photolithography and soft molding processes. Morphology and structure of the as-prepared nanomaterial was characterized by scanning microscope and X-ray diffraction analysis methods. The collected product is zero valent iron material with the morphology is nano-sheet with the thickness is approximatly 50 nm. Hexavalent chromium ion from K2Cr2O7 solution could be removed by the as-prepared iron nanomaterial. The removal of ions Cr(VI) is determined and confirmed by the visible ultraviolet (UV-Vis) absorption spectroscopy which is proportional to the amount of nanomaterial used and is influenced by pH conditions.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2020.020
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2020
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  • 4
    Online Resource
    Online Resource
    Green synthesis of iron nanoparticles using Cleistocalyx operculatus leaves extract and application iron nanoparticles to treat oganic dye Methylene Blue
    Hanoi University of Science and Technology ; 2023
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 11, No. 4 ( 2023-02-28), p. 63-67
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 11, No. 4 ( 2023-02-28), p. 63-67
    Abstract: Green synthesis is a potential method and increasingly popular for synthesizing nanoparticles. In this study, iron nanomaterial was green sythesized using Cleistocalyx operculatus leaves extract as reducing agent. Morphology and structure of the as-prepared nanomaterial was characterized by scanning microscope, X-ray diffraction analysis methods. The collected product is iron nano material with the morphology is paticles with the diameter is approximatly 100 nm. The iron nanomaterial revealed the high degradation performance toward Methylene Blue (MB) solution. The removal color of MB is determined and confirmed by the visible ultraviolet (UV-Vis) absorption spectroscopy which is proportional to the amount of nanomaterial used and is influenced by pH conditions.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2022.071
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2023
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  • 5
    Online Resource
    Online Resource
    Preparation of hydrogel calcium-alginate microparticles via microfluidic device for Cu2+ treatment
    Hanoi University of Science and Technology ; 2020
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 9, No. 1 ( 2020-04-30), p. 60-66
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 9, No. 1 ( 2020-04-30), p. 60-66
    Abstract: Alginate-based hydrogels are attracted much attention in biomedical and chemical field, and their size and shape are significant to their applications like drug delivery and cell encapsulation. Monodisperse sodium alginate microdroplets are produced using a flow-focusing microfluidic device (MFFD) by adjusting the flow rate on the continuous phase (soybean oil) and the dispersed phase (sodium alginate solution). The external gelation process of sodium alginate microdroplets occurs outside the chanel in a calcium chloride solution to form calcium alginate hydrogel particales. The shape, size and size distribution of these calcium alginate hydrogel particles depend strongly on the flow rate inside the MFFD. By optimizing the parameters, the hydrogel microparticles were obtained with diameters ranging from 70 µm to 100 µm with size distribution under 10%, depending on experimental conditions. The removal of Cu2+ ions by the absorption of hydrogel microparticles was also demonstrated.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2020.010
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2020
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  • 6
    Online Resource
    Online Resource
    Adsorption characteristics of amoxicillin antibiotic on CeO2-coated SiO2 nanomaterials
    Hanoi University of Science and Technology ; 2020
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 9, No. 4 ( 2020-12-31), p. 111-116
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 9, No. 4 ( 2020-12-31), p. 111-116
    Abstract: This study investigated adsorption of beta-lactam antibiotic Amoxicillin (AMX) on a new material of cerium oxide-coated nanosilica (CeO2-coated SiO2). The CeO2-coated SiO2 based on rice husk, was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and  transmission electron microscopy (TEM). Adsorption behaviors of AMX on CeO2-coated SiO2 at different pH and ionic strength were thoroughly studied. The highest removal of AMX using CeO2-coated SiO2 reached 99.26 % at pH 4 while the maximum adsorption capacity was found to be greater than 11.0 mg/g. Adsorption isotherms of AMX on CeO2-coated SiO2 at different ionic strength were in accordance with Freundlich model. Adsorption of amphoteric AMX species on CeO2-coated SiO2 increased with a decrease of salt concentration indicating that adsorption was controlled by both electrostatic and non-electrostatic interactions
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2020.079
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2020
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  • 7
    Online Resource
    Online Resource
    Evaluation the metal content of copper (Cu), manganese (Mn) and zinc (Zn) in in fish species Gerres filamentosus (Cuvier, 1829) in Gianh river at Quang Trach district, Quang Binh province
    Hanoi University of Science and Technology ; 2021
    In:  Vietnam Journal of Catalysis and Adsorption Vol. 10, No. 1S ( 2021-10-15), p. 329-333
    Details
    In: Vietnam Journal of Catalysis and Adsorption, Hanoi University of Science and Technology, Vol. 10, No. 1S ( 2021-10-15), p. 329-333
    Abstract: In recent years the fish consumption advisories for the population has become of great concern. The flame atomic absorption spectrometry (F-AAS) was applied to determine the copper, maganese and zinc content in fish species Gerres filamentosus (Cuvier, 1829) from Gianh river at Quang Tranh distric, Quang Binh province. This method had a high repeatability with RSD 4.3%, the recovery from 94 % to 106 %, and low limit of detection. Our results showed that the average concentration of copper, maganese and zinc in fish species Gerres filamentosus (Cuvier, 1829) were 0.388 ÷ 0.601 mg/kg fresh; 0.261 ÷ 0.321 mg/kg fresh and 7.325 ÷ 10.120 mg/kg fresh, respectively. These concentration were within the allowed limits according to the regulation No. 46/BYT 2007. Our results give important finding about the consumption limits on certain metals, especially for Cu, Mn and Zn, all for minimizing potential health risks in population and related risk-based consumption limits for adults and children.
    Type of Medium: Online Resource
    ISSN: 0866-7411
    URL: Article
    DOI: 10.51316/jca.2021.113
    Language: Unknown
    Publisher: Hanoi University of Science and Technology
    Publication Date: 2021
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