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Author: search.filters.author.Panomsuwan, GasiditSubject: search.filters.subject.Hydrothermal carbonization

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    Fundamental study of carbon materials from empty fruit bunch via hydrothermal carbonization with H3PO4 and naoh activation
    (2020-01-01)
    Guntagerng, Kanogpan
    ;
    Panomsuwan, Gasidit
    ;
    Fuji, Masayoshi
    ;
    Eiad-ua, Apiluck
    Lignocellulosic biomass has great potential as an energy source or feedstock for further conversion. Empty fruit bunches (EFBs) were agricultural waste materials from palm oil production. In this research, we aim to study the morphology of hydrochars derived from EFBs via hydrothermal treatments with phosphoric acid (H<inf>3</inf>PO<inf>4</inf>) and sodium hydroxide (NaOH) activation at different concentrations (i.e., 0.5, 0.7, and 1 M) at 200°C for 12 h, followed by carbonization at 700°C under nitrogen atmosphere for 2 h. The samples were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and specific surface analysis. After carbonization, the hydrochar activated by 1.0 M H<inf>3</inf>PO<inf>4</inf> possessed the highest surface area of 590 m<sup>2</sup>/g with the dominance of micropores. Hydrothermal carbonization with acid-base activation showed an effective method in preparing high porous activated carbon from EFB.
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    Transformation of waste marigold flowers into porous carbons via hydrothermal carbonization
    (2019-01-01)
    Chaiammart, Nattapat
    ;
    Wongcharoen, Sittan
    ;
    Eiad-Ua, Apiluck
    ;
    Ishizaki, Takahiro
    ;
    Panomsuwan, Gasidit
    Vast quantities of marigold flowers are often discarded as waste at sacred places and temples after religious ceremonies in Thailand. This has motivated us to examine the utilization of waste marigold flowers as a precursor for the synthesis of porous carbons by hydrothermal carbonization (HTC) and pyrolysis. Waste marigold flowers were hydrothermally treated at 180 °C for 2, 12, and 24 h. The resultant hydrochars were subsequently pyrolyzed at 800 °C under argon (Ar) atmosphere. Based on X-ray diffraction and Raman spectroscopy analyses, the samples exhibited an amorphous phase regardless of HTC time. With increasing HTC time, the marigold surface became rougher and more ruptured. This resulted in the development of a porous structure, thereby increasing surface area. The specific surface area of carbon samples increased from 118 to 281 m<sup>2</sup> /g with HTC increasing from 2 to 24 h, respectively. Increase of specific surface area mainly resulted from the development of a microporous structure at longer HTC times. Our results offer guidelines to control surface area and porosity through the adjustment of HTC conditions.
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    Item type:Publication,
    Fundamental study of carbon materials derived from empty fruit bunch via hydrothermal carbonization
    (2018-11-01)
    Guntagerng, Kanogpan
    ;
    Panomsuwan, Gasidit
    ;
    Eiad-Ua, Apiluck
    The utilization of biomass has recently gained great attention in recent years owing to growth of global environmental concerns. The aim of this work is to study the morphology of carbon materials derived from biomass oil palm empty fruit bunch (EFB) via hydrothermal carbonization (HTC) at different temperatures (160-200 °C) and times (4-12 h) followed by carbonization at 300-900 °C under nitrogen atmosphere for 2 h. The physiochemical properties of carbon sample were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and surface area analysis. The results demonstrated that the increase of hydrothermal temperature, hydrothermal time, and carbonization temperature resulted in the formation of carbon materials with higher surface area, porosity and carbon content. Our results revealed that carbon derived from EFB via HTC at optimal condition exhibited porous structure with high surface area, which can be further applied for absorbent applications.