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Author: search.filters.author.Kengchuwong, MettaSubject: search.filters.subject.chitosan

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    Item type:Publication,
    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.