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Author: search.filters.author.Eiad-Ua, ApiluckSubject: search.filters.subject.Biomass

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    Influence of Acid Additive on Nanoporous Carbon Materials via HTC for Catalyst Support
    (2020-01-01)
    Longprang, Tripob
    ;
    Jaruwat, Dolrudee
    ;
    Udomsap, Parncheewa
    ;
    Chollacoop, Nuwong
    ;
    Eiad-Ua, Apiluck
    Nanoporous carbon materials were successfully synthesized via hydrothermal carbonization with acid additives. In this study the effect of hydrothermal temperature (160-200 °C), hydrothermal time (4-24 h) and influence of acid additive (HCl, HNO<inf>3</inf>, H<inf>2</inf>SO<inf>4</inf> and H<inf>3</inf>PO<inf>4</inf>) have been chosen in order to improve the surface structure. The samples have been characterized by scanning electron microscopy, nitrogen sorption, Fourier transform infrared spectroscopy and X-ray diffraction. The experimental results revealed that hydrothermal carbonization process and acid addition have effect on the properties of catalyst support. The results indicated that hydrothermal process at 200°C for 12 h and activation with H<inf>3</inf>PO<inf>4</inf> at 900 °C for 2 h, exhibited the highest surface area, porosity and pore volume leading to increased distribution of metal on the carbon support.
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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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    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.
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    Effects of hydrothermal temperature and time of hydrochar from Cattail leaves
    (2018-09-05)
    Jaruwat, Dolrudee
    ;
    Udomsap, Parncheewa
    ;
    Chollacoop, Nuwong
    ;
    Fuji, Masayoshi
    ;
    Eiad-Ua, Apiluck
    Hydrochar have been successfully synthesized from Cattail leaves via hydrothermal carbonization. This research study the effect of hydrothermal temperature (160-200°C) and reaction time (4-24 h) to develop porosity and surface area. The sample have been characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were employed to characterize morphology, surface function and disorder in carbon structure respectively. The results revealed that hydrothermal-carbonization process affect on the properties of hydrochar. The hydrothermal temperatures and time were increased resulted in the decomposition of hydrochar gradually increased amorphous carbon and aromatic groups on surface of hydrochar. Cattail leaves was hydrothermal carbonization at 200°C for 12 h resulted in the most degradation of hemicellulose and cellulose.
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    Characterization of carbon fibers from Thai horse manure via hydrothermal carbonization
    (2018-01-01)
    Wettayavong, Sorakit
    ;
    Sangnoi, Siwakron
    ;
    Kaewtrakulchai, Napat
    ;
    Eiad-Ua, Apiluck
    Carbon fibers from biomass have been successfully prepared via hydrothermal-carbonization and activated in air atmosphere for catalyst supporter. In this research, we study the effect of temperature (160-200 °C) and residence time (4-24 h) to pretreat the initial carbon precursor in terms of chemical properties (i.e. carbon content, surface functional group) including the physical properties such as porosity and total surface areas. Afterwards, carbonization was obtained at the temperature of 300 °C for 2h for developing the porosity and even removing the contaminants of hydrothermal char to reach the carbon fiber. Nevertheless, carbon fiber was characterized. Scanning electron microscopy (SEM) and Functional Transform Infrared spectroscopy (FTIR) were employed to characterize physical morphology and functional group on the surface, respectively.