Kinetics And Mechanism, Isotherm And Thermodynamic Studies On Absorption Of Cd (Ii), Pb (Ii), Ni (Ii), Ions From Aqueous Solution Using Urena Lobata (Ceaser Weed). Nwankwo, Chizaram H.
ABSTRACT
The potential of Urena Lobata
bark for the adsorption of Ni(II), Cd(II), and Pb(II) ions from aqueous
solution was investigated in a batch adsorption process. Various physiochemical
parameters such as pH, dosage, particle size, metal ion concentration, contact
time, and temperature were studied. The adsorbent study exhibits high
efficiency for the metal ions adsorption. The equilibrium adsorption data were
described by Langmuir, freundlich, Temkin,Dubinin — Radushkevich, FloryHuggins,
Hakins Jura, andHaley isotherm models. The coefficient of determination of the
models were high with freundlich providing best data description for adsorption
of the metal ions onto UrenaLobata bark. The kinetic models employed to
determine the rate and mechanism of adsorption processes are pseudo first
order, pseudo second order, Elovich, intra - particle diffusion, with pseudo
second order providing the best data description for adsorption ofthe metal
ions onto UrenaLobatabark. While the diffusion is controlled by liquid film
diffusion mechanism. The maximum adsorption capacity for Ni(II), Cd(II), and
Pb(II) ions are 50 mg/g each. Also the adsorption showed maximum adsorption at
pH 6, and contact time at 40 mins and 120 mins for Ni(II), and Pb(II) ions
respectively. Different thermodynamic parameters like Gibbs free energy (AG),
enthalpy (AH), and entropy (AS), ofthe adsorption process have also been
evaluated. The positive values of (AH) for the system confirm the endothermic
nature ofthe adsorption. The positive values of (As) observed for the
adsorption of the metal ions molecules suggested the increased randomness at
the solid solution interface during adsorption process, the negative value
of(AG) indicates that the process was spontaneous and feasible. The result
indicates that the adsorbent studied was found to be a promising alternative
for the adsorption ofNi(II), Cd(II), and Pb(II) ions from aqueous solutions.
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NWANKWO, H (2023). Kinetics And Mechanism, Isotherm And Thermodynamic Studies On Absorption Of Cd (Ii), Pb (Ii), Ni (Ii), Ions From Aqueous Solution Using Urena Lobata (Ceaser Weed). Nwankwo, Chizaram H.. Repository.mouau.edu.ng: Retrieved Nov 23, 2024, from https://repository.mouau.edu.ng/work/view/kinetics-and-mechanism-isotherm-and-thermodynamic-studies-on-absorption-of-cd-ii-pb-ii-ni-ii-ions-from-aqueous-solution-using-urena-lobata-ceaser-weed-nwankwo-chizaram-h-7-2
HAPPINESS, NWANKWO. "Kinetics And Mechanism, Isotherm And Thermodynamic Studies On Absorption Of Cd (Ii), Pb (Ii), Ni (Ii), Ions From Aqueous Solution Using Urena Lobata (Ceaser Weed). Nwankwo, Chizaram H." Repository.mouau.edu.ng. Repository.mouau.edu.ng, 06 Nov. 2023, https://repository.mouau.edu.ng/work/view/kinetics-and-mechanism-isotherm-and-thermodynamic-studies-on-absorption-of-cd-ii-pb-ii-ni-ii-ions-from-aqueous-solution-using-urena-lobata-ceaser-weed-nwankwo-chizaram-h-7-2. Accessed 23 Nov. 2024.
HAPPINESS, NWANKWO. "Kinetics And Mechanism, Isotherm And Thermodynamic Studies On Absorption Of Cd (Ii), Pb (Ii), Ni (Ii), Ions From Aqueous Solution Using Urena Lobata (Ceaser Weed). Nwankwo, Chizaram H.". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 06 Nov. 2023. Web. 23 Nov. 2024. < https://repository.mouau.edu.ng/work/view/kinetics-and-mechanism-isotherm-and-thermodynamic-studies-on-absorption-of-cd-ii-pb-ii-ni-ii-ions-from-aqueous-solution-using-urena-lobata-ceaser-weed-nwankwo-chizaram-h-7-2 >.
HAPPINESS, NWANKWO. "Kinetics And Mechanism, Isotherm And Thermodynamic Studies On Absorption Of Cd (Ii), Pb (Ii), Ni (Ii), Ions From Aqueous Solution Using Urena Lobata (Ceaser Weed). Nwankwo, Chizaram H." Repository.mouau.edu.ng (2023). Accessed 23 Nov. 2024. https://repository.mouau.edu.ng/work/view/kinetics-and-mechanism-isotherm-and-thermodynamic-studies-on-absorption-of-cd-ii-pb-ii-ni-ii-ions-from-aqueous-solution-using-urena-lobata-ceaser-weed-nwankwo-chizaram-h-7-2