Phensaijai, Mongkol

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Phensaijai, Mongkol
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Email
mongkol.ph@kmitl.ac.th

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    Item type:Publication,
    Study of antifungal activities of CuO/ZnO nanocomposites synthesized by co-precipitation method
    (2013-10-29)
    Phiwdang, Kankanit
    ;
    Phensaijai, Mongkol
    ;
    Pecharapa, Wisanu
    In this work, series of CuO/ZnO functional nanocomposites were synthesized through co-precipitation method using CuCl<inf>2</inf>·H<inf>2</inf>O and ZnCl<inf>2</inf> as starting materials with various molar ratio of copper:zinc, followed by annealing process at 600°C for 2 hours to obtain CuO/ZnO nanocomposites. The structures of the composites were analyzed using X-ray diffraction and field emission scanning electron microscopy. For XRD result, diffraction peaks of the composites reveal the well-crystalline characteristic indicating the mixture phase of CuO and ZnO. SEM results show different morphologies of CuO, ZnO and Cu-Zn oxide nanocomposites appearing in quasi spherical structure.The composites were used for antifungal activity via agar disk diffusion method. It is found that the composite with certain ratio of Cu:Zn exhibits superiority in partial inhibition of strain AspergillusflavusTrichoderma comparing to either pure CuO or ZnO. © (2013) Trans Tech Publications, Switzerland.
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    Item type:Publication,
    Biosorption of copper by spent yeast immobilized in sodium alginate beads
    (2009-12-01)
    Apinthanapong, Muanmai
    ;
    Phensaijai, Mongkol
    Spent yeast from the brewing industry was immobilized with sodium alginate and used in a study on biosorption of Cu(II). Kinetic models were developed using pseudo-first and -second order equations and tested for the sorption of Cu(II). The results showed that the sorption of Cu(II) onto immobilized spent yeast in sodium alginate beads could be described by a pseudo-second order model, which had high correlation coefficients (r<inf>2</inf>). The rate constant (k<inf>2</inf>) and the initial sorption rate (h) were calculated. The values of the rate constants were found to decrease from 0.208 to 0.037 g/mg min with an increase in the initial concentration of Cu(II) from 20 to 80 ppm. The initial sorption rate increased from 0.014 to 0.037 mg/g min as the initial concentration of Cu(II) was varied from 20 to 80 ppm. The observed dependence of the sorption rate on the initial concentration of Cu(II) indicated that the removal of Cu(II) was more rapid when the initial concentration of the solution was high.