Siriphannon, Punnama

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Siriphannon, Punnama
Alternative Name
Siriphannon, P.
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Email
punnama.si@kmitl.ac.th

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    Facile synthesis of chitosan/CuO nanocomposites for potential use as biocontrol agents
    (2018-06-01)
    Siriphannon, P.
    ;
    Iamphaojeen, Y.
    Chitosan/CuO nanocomposites (Chi/CuO) were prepared by facile and eco-friendly technique. The 2%w/v chitosan solution was mixed with 0.5 %w/w sodium tripolyphosphate (STPP), resulting in the formation of ionically crosslinked chitosan. The crosslinked chitosan was soaked in an aqueous solution containing 0.001, 0.01 or 0.1 mol/L CuSO<inf>4</inf>•5H<inf>2</inf>O for 24 hrs, in which the Cu<sup>2+</sup> ions were absorbed into the chitosan network, forming as the chitosan/Cu<sup>2+</sup> precursors. The chitosan/Cu<sup>2+</sup> precursors were hydrothermally reacted in two different basic media, i.e. NaOH and NH<inf>4</inf>OH, at 100°C for 24 hrs, resulting in the nano-sized CuO crystals hydrothermally grew and embedded in the crosslinked chitosan matrix. The CuO grown in the NaOH possessed larger crystallite size and higher crystallinity than that in the NH<inf>4</inf>OH. In addition, the CuO crystallite size in the nanocomposites increased with the increase of initial concentration of Cu<sup>2+</sup> starting agent due to the increase of Cu<sup>2+</sup> quantity in the chitosan/Cu<sup>2+</sup> precursors. The chitosan/CuO nanocomposites prepared by using 0.01 and 0.1 mol/L Cu<sup>2+</sup> could exhibit the antibacterial activities after intimate contact with Staphylococcus aureus and Escherichia coli under JIS L 1902:1998 (Qualitative) test method, indicating their potential use as biocontrol agents.
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    Nanoporous copper doped aluminium pillared montmorillonite for dye-containing wastewater treatment
    (2016-11-01)
    Tepmatee, Pratyaporn
    ;
    Siriphannon, Punnama
    Copper doped aluminium pillared montmorillonite (Cu-Alpill-MMT) was prepared by adding Cu<sup>2+</sup> into the suspension of aluminium pillared montmorillonite (Alpill-MMT) using high power ultrasonic treatment and calcining to CuO at 500°C. The XRD and XRF data revealed that the doped CuO partially occupied both internal and external surfaces of the Alpill-MMT. The N<inf>2</inf> adsorption/desorption analysis showed that the Cu-Alpill-MMT consisted of slit-like mesopores with two ranges of pore diameter, i.e. ∼3.8 nm and ∼6-30 nm. The Cu-Alpill-MMT exhibited the superior adsorption capacity for Basic Yellow 1 (BY1), however, it hardly adsorbed Reactive Orange 16 (RO16). The decolorization of RO16 was achieved when the H<inf>2</inf>O<inf>2</inf> or H<inf>2</inf>O<inf>2</inf>/UV was introduced into the treatment system together with the Cu-Alpill-MMT, acting as heterogeneous catalyst for Fenton or photo-Fenton oxidation processes, respectively. The Cu-Alpill-MMT could exhibit the antibacterial activity after intimate contact with Escherichia coli ATCC®25922 under JIS L 1902: 1998 (Qualitative) test method.