ABSTRACT
Chitosan
was prepared from crab shells using standard chemical procedures. 1 he
physicochemical properties, degree of deacetylation (74%) and ash content
(1.19%) of the prepared chitosan showed that crab shell is a good source of
chitosan. The waler binding capacity of the prepared chitosan was 50.4% while
fat binding capacity was 37.2%. FT-IR. spectra gave characteristics bands of
NI12 at 3449.00 cm'1, carbonyl at 1640.93 em'and hydroxyl at 1435.90 cm'1.
Batch adsorption experiments were performed at different concentrations ol
metal ions, different temperatures, contact time and pH. The results indicated
that the uptake performance ol chitosan biopolymer changed with pH,
concentration, temperature and co-ions. The optimum pH for the adsorption of
metal ions were observed to be; Cr(VI) (2.0),Zn(ll) (4.0).Ni(II) (8.0), Pb (II)
(4.0).Cu (II) (8.0), and Cd(II) (8.0).The Freundlich and Temkin adsorption
isotherm models adequately represented the adsorption data obtained in the
study. fhc kinetic studies showed that biosorption rates could be described
better by a pseudo-second order process and the rate coefficients were
determined to be 1.4620 x 1 (Pinin'1 ,1.520x1 O'" min’1. 3.840 x 1
(Pinin’1.4.469 xl(P min’1, 7.12 xKPmin'1, and 1.257 xl(P min 'for CT2O7'.
Zn“'.Ni‘',.Pb"',Cu2' and,Cd24, respectively. Adsorption efficiencies of
chitosan for removal of the metals were found to range from 73.3% to 90% while
desorption efficiencies ranged from 60 to 80%. Chromium and cadmium showed high
desorption rates while lead showed lower desorption rate. The presence of chloride
ions under the same operating conditions reduced the adsorption of lead and
improved adsorption of zinc and cadmium by chitosan. Chitosan biopolymer
demonstrated high adsorption capacity for the heavy metal ions investigated.
CHIMARAOKE, G (2024). An investigation into the adsorption properties of chitosan prepared from crab shell:- Onwubuazu, Chimaraoke G. Mouau.afribary.org: Retrieved Sep 08, 2024, from https://repository.mouau.edu.ng/work/view/an-investigation-into-the-adsorption-properties-of-chitosan-prepared-from-crab-shell-onwubuazu-chimaraoke-g-7-2
G, CHIMARAOKE. "An investigation into the adsorption properties of chitosan prepared from crab shell:- Onwubuazu, Chimaraoke G" Mouau.afribary.org. Mouau.afribary.org, 08 Apr. 2024, https://repository.mouau.edu.ng/work/view/an-investigation-into-the-adsorption-properties-of-chitosan-prepared-from-crab-shell-onwubuazu-chimaraoke-g-7-2. Accessed 08 Sep. 2024.
G, CHIMARAOKE. "An investigation into the adsorption properties of chitosan prepared from crab shell:- Onwubuazu, Chimaraoke G". Mouau.afribary.org, Mouau.afribary.org, 08 Apr. 2024. Web. 08 Sep. 2024. < https://repository.mouau.edu.ng/work/view/an-investigation-into-the-adsorption-properties-of-chitosan-prepared-from-crab-shell-onwubuazu-chimaraoke-g-7-2 >.
G, CHIMARAOKE. "An investigation into the adsorption properties of chitosan prepared from crab shell:- Onwubuazu, Chimaraoke G" Mouau.afribary.org (2024). Accessed 08 Sep. 2024. https://repository.mouau.edu.ng/work/view/an-investigation-into-the-adsorption-properties-of-chitosan-prepared-from-crab-shell-onwubuazu-chimaraoke-g-7-2