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Author: search.filters.author.Sumtong, Peerawith

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    Effect of mixing of carbon support from sawdust and sugarcane bagasse by hydrothermal carbonization for synthesis of molybdenum disulfide (MoS2) catalyst
    (2018-01-01)
    Sumtong, Peerawith
    ;
    Goodwin, Vituruch
    ;
    Chollacoop, Nuwong
    ;
    Eiad-Ua, Apiluck
    Molybdenum disulfide (MoS<inf>2</inf> ) catalyst on carbon support from varying ratio of sawdust and sugarcane bagasse has been successfully synthesized by hydrothermal carbonization and calcination process. Hydrothermal carbonization of lignocellulosic structure into carbon support is investigated at 200<sup>o</sup> C for 24 hr and calcination at 600<sup>o</sup> C for 2 hr. The precursor of MoS<inf>2</inf> catalyst is prepared using thiourea (CH<inf>4</inf> N<inf>2</inf> S) and ammonium molybdate tetrahydrate ((NH<inf>4</inf> )<inf>6</inf> Mo<inf>7</inf> O<inf>24</inf><sup>.</sup> 4H<inf>2</inf> O) loaded on carbon support. The lignocellulosic structure as hemicellulose and cellulose is changed at high temperature via hydrothermal carbonization and calcination. The distribution of molybdenum disulfide on carbon support is varied based on morphology and functional group of carbon support. The morphology and functional group were analyzed using Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). It shows that carbon support at equal ratio (1:1) of sawdust and sugarcane bagasse is an optimum ratio with high distribution of molybdenum disulfide catalyst on carbon support.
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    Fabrication of Anodic Titanium Oxide (ATO) for waste water treatment application
    (2017-01-01)
    Choksumlitpol, Pimsuree
    ;
    Mangkornkarn, Chayangkoon
    ;
    Sumtong, Peerawith
    ;
    Onlaor, Korakot
    ;
    Eiad-Ua, Apiluck
    In this study, forming of Anodic Titanium Oxide (ATO) that has a nanoporous and nanotube morphology was studied for waste water treatment application. Nanoporous anodic titanium oxide was obtained by anodization, using ethylene glycol merging with ammonium fluoride at room temp as electrolyte. The variables of the process were anodization time (5, 10, 15 and 20 min) and anodization voltages (20, 40 and 60 V). Field emission scanning electron microscopy revealed that separated nanotubes became obvious when the voltage is high. The samples with different ATO conditions were investigated by the degradation of methylene blue under UV light irradiation. It was found that the activity of the photocatalysis of ATO was significantly enhancement of the degradation of methylene blue. These results suggest that ATO/UV photocatalysis as a method for treatment of diluted waste waters in textile industries.
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    Fabrication of low cost membrane from anodic aluminum oxide
    (2017-01-01)
    Sumtong, Peerawith
    ;
    Eiad-Ua, Apiluck
    Anodic Aluminum Oxide (AAO) membrane has been successfully fabricated from twostep anodization with aluminum low grade (Al6061). The pore density, the pore diameter, and the interpore distance can be controlled by varying anodization process conditions. However, there are limits to control the mechanical strength and growth of AAO arrays, such as pore density, pore diameter and interpore distance. In this research the self-organized two-step anodization is carried out varying time at 24, 48 and 72 hours, respectively with 40V at the low temperature 2-5oC. The optimum conditions of AAO with two-step anodization is 40V for 48 hr. Finally, AAO substrate is separated from aluminum low-grade and enlarged pore diameter with pore widening process by 5% H3PO<inf>4</inf>. The physical properties were investigated by mean of field emission scanning electron microscope (FE-SEM) show that the average pore diameter and average interpore distance increase with the anodization time. Al6061 Aluminum substrate can be used to fabricate a nanoporous AAO film with an average pore diameter and average interpore distance larger than 70 and 90 nanometers, respectively but less mechanical stability.
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    Nanoporous anodic aluminum oxide (AAO) thin film fabrication with low-grade aluminium
    (2016-01-01)
    Sumtong, Peerawith
    ;
    Eiad-Ua, Apiluck
    ;
    Chalapat, Khattiya
    Anodic aluminum oxide (AAO) is well known for its nanoscopic structures and its applications in microfluidics, sensors and nanoelectronics. The pore density, the pore diameter, and the interpore distance of an AAO substrate can be controlled by varying anodization process conditions. In this research, the self-organized two-step anodization is carried out with a low-grade (Al6061) aluminium substrate using a 40V voltage at the temperature of 2 to 5 °C. Three experiments are done with the anodization time of 24 hours, 48 hours and 72 hours. The structural features of AAO are characterized by a field emission electron microscope (FE-SEM). The data from FE-SEM show that the average pore diameter increases with the anodization time, and that the Al6061 aluminium substrate can be used to fabricate a nanoporous AAO film with an average pore diameter smaller than 17 nanometers.