Sorption Studies On The Removal Of Naphtolas Dye By Modified And Unmodified Nano Zero-Valent Iron (NZVI) Using Sodium Dodecyl Sulphate As Modifier:- Onyeuwaoma, James C.
ABSTRACT
This study compared the
potential of SDS modified and unmodified NZVI adsorbent in removing Naphtol AS
from aqueous solutions. The batch-adsorption experiments were performed as a
function of pH, temperature, concentration, contact time as well as dynamics of
the process. The Langmuir, Freundlich and Dubinin-Raduskevich isotherm models
for the various adsorption were tested. The coefficients of determination ofthe
three models were high, with Langmuir providing best description for adsorption
ofthe dye solution onto unmodified and SDS modified NZVI, with the SDS modified
NZVI fitting more with a higher R2 value of 0.93. Maximum adsorption capacity
corresponding to monolayer coverage (qmax values in mg/g) obtained from
Langmuir plots are -0.104123 and -0.053616 respectively for Naphtol AS adsorption
onto SDS modified and unmodified NZVI. The adsorption process was highly
pHdependent and the results indicate that the optimum pH for adsorption
ofNaphtol AS onto SDS modified and Unmodified NZVI occurred at 6.0 and 4.0
respectively having maximum removal efficiencies of 91 % and 88 % respectively.
Studies on the effect oftemperature showed that the optimum temperature for
adsorption of Naphtol AS onto SDS modified and unmodified NZVI are 50°C and 70°
c respectively. Pseudo first-order and second-order and intra-particle
diffusivity kinetic models were applied to the experimental data and results
showed that the pseudo second-order provided best fit for the experimental
data. Kinetic studies also showed that the adsorption transport mechanism was
particle-diffusion controlled.
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JAMES, C (2023). Sorption Studies On The Removal Of Naphtolas Dye By Modified And Unmodified Nano Zero-Valent Iron (NZVI) Using Sodium Dodecyl Sulphate As Modifier:- Onyeuwaoma, James C.. Repository.mouau.edu.ng: Retrieved Nov 23, 2024, from https://repository.mouau.edu.ng/work/view/sorption-studies-on-the-removal-of-naphtolas-dye-by-modified-and-unmodified-nano-zero-valent-iron-nzvi-using-sodium-dodecyl-sulphate-as-modifier-onyeuwaoma-james-c-7-2
CHIBUEZE, JAMES. "Sorption Studies On The Removal Of Naphtolas Dye By Modified And Unmodified Nano Zero-Valent Iron (NZVI) Using Sodium Dodecyl Sulphate As Modifier:- Onyeuwaoma, James C." Repository.mouau.edu.ng. Repository.mouau.edu.ng, 11 Dec. 2023, https://repository.mouau.edu.ng/work/view/sorption-studies-on-the-removal-of-naphtolas-dye-by-modified-and-unmodified-nano-zero-valent-iron-nzvi-using-sodium-dodecyl-sulphate-as-modifier-onyeuwaoma-james-c-7-2. Accessed 23 Nov. 2024.
CHIBUEZE, JAMES. "Sorption Studies On The Removal Of Naphtolas Dye By Modified And Unmodified Nano Zero-Valent Iron (NZVI) Using Sodium Dodecyl Sulphate As Modifier:- Onyeuwaoma, James C.". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 11 Dec. 2023. Web. 23 Nov. 2024. < https://repository.mouau.edu.ng/work/view/sorption-studies-on-the-removal-of-naphtolas-dye-by-modified-and-unmodified-nano-zero-valent-iron-nzvi-using-sodium-dodecyl-sulphate-as-modifier-onyeuwaoma-james-c-7-2 >.
CHIBUEZE, JAMES. "Sorption Studies On The Removal Of Naphtolas Dye By Modified And Unmodified Nano Zero-Valent Iron (NZVI) Using Sodium Dodecyl Sulphate As Modifier:- Onyeuwaoma, James C." Repository.mouau.edu.ng (2023). Accessed 23 Nov. 2024. https://repository.mouau.edu.ng/work/view/sorption-studies-on-the-removal-of-naphtolas-dye-by-modified-and-unmodified-nano-zero-valent-iron-nzvi-using-sodium-dodecyl-sulphate-as-modifier-onyeuwaoma-james-c-7-2