Eiad-Ua, Apiluck

Preferred name

Eiad-Ua, Apiluck

Alternative Name

Eiad-ua, Apiluck

Eiad-Ua, A.

Eiadua, A.

Main Affiliation

Integrated Innovative Technology

apiluck.ei@kmitl.ac.th

Now showing 1 - 7 of 7

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Effects of hydrothermal temperature and time of hydrochar from Cattail leaves
(2018-09-05)
Jaruwat, Dolrudee
;
Udomsap, Parncheewa
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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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Fundamental study of carbon materials derived from empty fruit bunch via hydrothermal carbonization
(2018-11-01)
Guntagerng, Kanogpan
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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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Cattail leaf-derived nitrogen-doped carbons via hydrothermal ammonia treatment for electrocatalytic oxygen reduction in an alkaline electrolyte
(2022-07-12)
Panomsuwan, Gasidit
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Eiad-ua, Apiluck
;
Kaewtrakulchai, Napat
;
Seizawa, Ai
;
Ishizaki, Takahiro
Cattail leaf-derived nitrogen-doped carbons (CL-NCs) were prepared by hydrothermal treatment in ammonia solution and subsequent pyrolysis for application as catalysts for the oxygen reduction reaction (ORR). The ammonia concentration was varied at 1.0, 1.5, and 2.0 M to alter the nitrogen doping content. The characterization results revealed that CL-NCs exhibited an amorphous structure, while the density of structural defects increased as the ammonia concentration increased. The CL-NC prepared without hydrothermal ammonia treatment had a nonporous structure with a low specific surface area (5 m2 g−1). With hydrothermal ammonia treatment, CL-NCs exhibited a micro–mesoporous structure with a higher surface area (113–496 m2 g−1); however, the surface area was significantly diminished at higher ammonia concentrations due to the deterioration of the pore structure. The nitrogen-doping content in CL-NCs varied from 0.65 to 1.55 atom% with the predominant ratios of pyridinic-N and graphitic-N. For electrochemical evaluation in an alkaline electrolyte (0.1 M KOH), CL-NC prepared at an ammonia concentration of 1.0 M showed the highest ORR activity among all samples, as indicated by the most positive onset potential (−0.05 V vs. Ag/AgCl) and half-wave potential (−0.22 V vs. Ag/AgCl) as well as the highest diffusion-limiting current density with a more favorable reduction via a direct four-electron pathway (n = 3.23–3.52). The ORR activity of CL-NCs had a similar trend to their specific surface area rather than nitrogen doping content, indicating the important role of surface area and porosity in enhancing the ORR activity. Moreover, it possessed excellent stability under long-term operation and exposure to methanol. The results obtained in this work could be helpful information for the further development and utilization of biomass-derived NCs for ORR catalysts.
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Characterization of carbon fibers from Thai horse manure via hydrothermal carbonization
(2018-01-01)
Wettayavong, Sorakit
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Sangnoi, Siwakron
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Kaewtrakulchai, Napat
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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.
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Influence of Acid Additive on Nanoporous Carbon Materials via HTC for Catalyst Support
(2020-01-01)
Longprang, Tripob
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Jaruwat, Dolrudee
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Udomsap, Parncheewa
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Chollacoop, Nuwong
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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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PRODUCTION OF TORREFIED BIOMASS PELLETS FROM WOODY AND AGRICULTURAL RESIDUES
(2023-01-01)
Inthapat, Pimonpan
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Boontanon, Suwanna Kitpati
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Prachakittikul, Pensiri
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Eiad-ua, Apiluck
;
Jadsadajerm, Supachai
Two different combined process sequences of biomass pretreatment between pelletization after torrefaction (PAT) and pelletization before torrefaction (PBT) were comparatively investigated to produce torrefied biomass pellets (TBP) from woody biomasses, e.g. Leucaena (LC) and rubberwood (RW), and agricultural residues, e.g. rice straw (RS) and sugarcane leaves (SCL). In this study, each sample was thermally treated at 260-300°C for 5 min during torrefaction process. It was found that both woody biomasses and agricultural residues had mass yield lower than 63 wt%, while the bulk density of TBPs were improved higher than 400 kg/m3. For equilibrium moisture content (EMC) analysis, TBPs via PBT method had lower EMC than raw pellet after being kept at 30°C for 12 days. For the thermochemical properties, the TBPs had higher FC, %C, and HHVs than raw pellets in all biomass and increased with torrefaction temperature. When comparing the TBPs between PAT and PBT torrefied pellets, the HHVs of PBT torrefied pellets at 300°C were achieved highest at 27 MJ/kg (dry-ash-free, daf, basis) for SCL sample, which was considered as higher than the standard value at ≥21 MJ/kg of thermally treated biomass pellets (ISO/TS 17225-8:2016) and also in the range at 25.7-28.2 MJ/kg of coal. In addition, the combustion performance index (Sn) of PAT and PBT torrefied pellets was lower than raw pellets, showing a similar property as coal and lignite. Briefly, this study suggests using PBT pretreatment process to produce high quality solid fuel, particularly for agricultural residues such as SCL for a potential substitute of currently used coal.
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Transformation of waste marigold flowers into porous carbons via hydrothermal carbonization
(2019-01-01)
Chaiammart, Nattapat
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Wongcharoen, Sittan
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Eiad-Ua, Apiluck
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Ishizaki, Takahiro
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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 m2 /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.

Eiad-Ua, Apiluck

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