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Author: search.filters.author.Kitiwan, MettayaSubject: search.filters.subject.graphene oxide

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    Hydrogen Sulfide Adsorption on Alumina/Graphene Oxide Composites at Ambient Temperature
    (2022-11-01)
    Hankoy, Montree
    ;
    Kitiwan, Mettaya
    ;
    Phrompet, Chaiwat
    ;
    Ruttanapun, Chesta
    ;
    Kaewpengkrow, Prangtip Rittichote
    Hydrogen sulfide (H<inf>2</inf>S) is one of the most common pollutants found in natural gas and industrial waste. Over the few decades, the removal of H<inf>2</inf>S has become a significant problem. In the field of a clean environment such as water purification and toxic gas removal, graphene oxide (GO) has been found to have advantages. In this study, the influence of GO on alumina (Al<inf>2</inf>O<inf>3</inf>) as an adsorbent of H<inf>2</inf>S was examined. A series of Al<inf>2</inf>O<inf>3</inf>/GO (AGO) composites with varying graphene oxide addition (0.5–3.0 wt%) were prepared using the high-temperature sintering method. The X-ray diffraction patterns indicate the primary phase of Al<inf>2</inf>O<inf>3</inf> with hexagonal crystal structure for all AGO composites. Raman spectrometry measurements confirmed that the GO particles were incorporated in AGO composites. The TEM image indicated that GO nanosheets were embedded between Al<inf>2</inf>O<inf>3</inf> grains. The efficiency of AGO adsorbent at ambient temperature was investigated and compared with the pristine Al<inf>2</inf>O<inf>3</inf> adsorbent. The AGO composites adsorbent demonstrated the H<inf>2</inf>S breakthrough capacity in the range of 0.07–0.43 mg/g, which is higher than that of pristine Al<inf>2</inf>O<inf>3</inf> (0.06 mg/g). Furthermore, the highest H<inf>2</inf>S breakthrough capacity of 0.43 mg/g was obtained from AGO containing 3.0 wt% GO. This investigation demonstrates that the AGO adsorbent fabricated using a simple method has the potential to be used for H<inf>2</inf>S removal at ambient temperature.
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    Investigation of Contact Angles of SnAgCu Solder Paste Mixed with Graphene Oxide Using Digital Holography Technique
    (2021-01-20)
    Jongjinakool, Kavisra
    ;
    Prakobsang, Tawipon
    ;
    Plaipichit, Suwan
    ;
    Kanlayasiri, Kannachai
    ;
    Kitiwan, Mettaya
    Since lead is a pollutant to the environment, therefore lead-free solder paste compounds have been interested in many research teams. The objective of this research is the investigation properties of solder paste with graphene oxide and reduced graphene oxide. In our experimental method the solder pastes of SnAgCu mixed with graphene oxide with bad electrical conductivity at different concentration by weight of 0.00%, 0.05%, 0.1% and 0.2% respectively. Subsequently, the shape changes of the compounds have been investigated by using digital in-line holography using laser diode wavelength 635 nm as the light source. The solder paste compounds were melted at 250 ± 5 °C and were recorded for every 5 seconds. Then, the contact angles of the melted solder paste compound have been determined using their digital holographic reconstructed images.