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Chitosan nanoparticles from three-spot swimming crab shells for cupric ion adsorption from synthetic wastewater
Author(s)
Kengchuwong, Metta
Ketwong, Chatyapha
Trisupakitti, Somsuk
Ponkham, Pornpimol
Ketwong, Panuwat
Morris, John
Date Issued
November 1, 2024
Type
Article
Abstract
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− of gum arabic, used for gelation, and NH3+ at 1,417 cm-1 and the amino group at 1,554 cm-1 of chitosan. Adsorption and kinetics for Cu2+ removal by both CT and CTNP were compared. CTNP adsorption matched a Langmuir isotherm. Cu2+ adsorption by CTNP followed a second-order reaction, indicating bonding of Cu2+ to the nanoparticles. CTNP was much more effective and faster in adsorbing Cu2+ 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.
Citation
Songklanakarin Journal of Science and Technology, 46(6), 507-514, 2024