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Author: search.filters.author.Ketwong, Chatyapha

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    Chitosan nanoparticles from three-spot swimming crab shells for cupric ion adsorption from synthetic wastewater
    (2024-11-01)
    Kengchuwong, Metta
    ;
    Ketwong, Chatyapha
    ;
    Trisupakitti, Somsuk
    ;
    Ponkham, Pornpimol
    ;
    Ketwong, Panuwat
    Chitosan (CT) and chitosan nanoparticles (CTNP), extracted from three-spot swimming crab (Portunus sanguinolentus) shells by deacetylation and then ionic gelation, were used to removed pollutants from wastewater. Chitin deacetylation yield to form chitosan was ~75%, measured from FT-IR spectral peak area. After forming CTNP, the FT-IR spectra showed overlapped peaks for COO<sup>−</sup> of gum arabic, used for gelation, and NH3<sup>+</sup> at 1,417 cm<sup>-1</sup> and the amino group at 1,554 cm<sup>-1</sup> of chitosan. Adsorption and kinetics for Cu<sup>2+</sup> removal by both CT and CTNP were compared. CTNP adsorption matched a Langmuir isotherm. Cu<sup>2+</sup> adsorption by CTNP followed a second-order reaction, indicating bonding of Cu<sup>2+</sup> to the nanoparticles. CTNP was much more effective and faster in adsorbing Cu<sup>2+</sup> than CT by 52%, after only a 5-minute reaction time. When using CTNP, the optimum loading was 0.5 g/100 L, at pH 5, 300 rpm and 30 min.
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    Rubber Wood Sawdust Waste Converted to Activated Carbon for Heavy Metal Removal from Wastewater
    (2023-01-01)
    Kengchuwong, Metta
    ;
    Ketwong, Chatyapha
    ;
    Nuasri, Chompoo
    ;
    Wanich, Suchana
    ;
    Trisupakitti, Somsuk
    In this study, we characterized activated carbon prepared from rubber wood sawdust waste and determined optimum conditions for removing copper ions from synthetic wastewater. Rubber wood sawdust was calcined at 600°C for 30 min and then activated with commercial vinegar (5%v/v acetic acid) or 5% lime juice for 24 hr. Three characteristics of the activated carbon were evaluated: (i) to study the ability to remove copper ions versus exposure time, pH and the amount of adsorbent, (ii) adsorption isotherms and (iii) adsorption kinetics. A Langmuir isotherm indicated that the activated carbon adsorbed a monolayer of Cu(II) ions, K<inf>L</inf> = 7.91 mg/L with a capacity to adsorb 0.37 mg Cu(II)/g. The optimum conditions for usage was found at 20 g/L activated carbon in wastewater, pH 5 and 60 min adsorption time. Adsorption kinetics were consistent with a pseudo-second order reaction. The results of the study suggest that converting rubber wood sawdust waste to activated carbon allows it to become useful to remove heavy metal pollutants from wastewater.