SYNTHESIS, CHARACTERIZATION, APPLICATION OF ZINC OXIDE NANOPARTICLES-CARBONIZED SAW DUST MATRIX FOR THE TREATMENT OF HEAVY METALS CONTAMINATED WATER/ Racheal Osarieme AIGBE; Supervisor: Doğa KAVAZ
Tanım: p. VIII, 113; table, figure, illustrations, 30.5 cm CDİçerik türü:- text
- unmediated
- volume
Thesis
| Materyal türü | Geçerli Kütüphane | Koleksiyon | Yer Numarası | Durum | Notlar | İade tarihi | Barkod | Materyal Ayırtmaları | |
|---|---|---|---|---|---|---|---|---|---|
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Thesis
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CIU LIBRARY Tez Koleksiyonu | Tez Koleksiyonu | D 209 A44 2020 (Rafa gözat(Aşağıda açılır)) | Kullanılabilir | Environmental Science Department | T2060 |
CIU LIBRARY raflarına göz atılıyor, Raftaki konumu: Tez Koleksiyonu, Koleksiyon: Tez Koleksiyonu Raf tarayıcısını kapatın(Raf tarayıcısını kapatır)
Includes CD
Thesis (Ph.D) - CYPRUS INTERNATIONAL UNIVERSITY INSTITUTE OF GRADUATE STUDIES AND RESEARCH Environmental Science Department
Includes references p. 92-113
ABSTRACT
Zinc oxide nanoparticle (ZnOnp) owns a high surface area and volume ratio molecular
nanoparticle likewise carbonized sawdust with higher surface area and volume ratio as an
atomic nanoparticle. The matrix of both ZnOnp and CSD is functional with improving
efficiency in the removal of heavy metals from aqueous solution. This work presents
ZnOnp, CSD, and ZnOnp-CSD matrix as adsorbents for the adsorption of Pb (II) and Cd
(II) ions from aqueous solution. The ZnOnp was synthesized by chemical precipitation
with different calcination temperatures and CSD was prepared by thermal carbonization
of sawdust. The synthesized ZnO nanoparticles at different calcination temperatures were
characterized by SEM, FTIR, and UV-Visible spectroscopy. Batch experiments were
carried out to unravel the efficiency of adsorption of Pb (II) and Cd (II) ions onto ZnOnp,
CSD, and ZnOnp-CSD matrix. The efficiency of adsorption was observed to depend on
the pH of the adsorbate-adsorbent mixture, while the optimum pH observed is pH 8. The
optimum contact time and adsorbent dosage were observed to be 100 minutes and 0.05 g
respectively. The adsorption isotherm studies revealed that both Freundlich and Langmuir
isotherms were bets fits for describing the adsorption of Pb (II) and Cd (II) ions onto
ZnOnp, CSD, and ZnOnp-CSD matrix. The dimensionless separation factors show that
ZnOnp, CSD and ZnOnp-CSD matrix can be employed as an alternative adsorbent for
heavy metals removal from aqueous solution. Parameters obtained from thermodynamics
studies revealed that the adsorption of Pb (II) and Cd (II) ions onto ZnOnp, CSD, and
ZnOnp-CSD matrix were endothermic, spontaneous, and feasible with positive values of
enthalpy change (ΔH), a positive value of entropy change (ΔS) and negative value of free
energy (ΔG) achieved. Evaluation of kinetic mechanism shows that the adsorption data
governed with pseudo-second-order with the values of the rate constant (k2) for adsorption
of Pb (II) ions are 0.00149, 0.00188, and 0.00315 g mg-1min-1 onto ZnOnp, CSD a ZnOnp-
CSD matrix respectively, and for adsorption of Cd (II) are 0.00203, 0.00193 and 0.00301
g mg-1min-1 onto ZnOnp, CSD a ZnOnp-CSD matrix respectively. Reusability potential
of the adsorbents was evaluated for four-cycle of use-desorption-reuse and it was found
that for adsorption of Pb (II) ions, the potential was reduced from initial adsorption
efficiency of 71.04 to 51.11 % onto ZnOnp, 75.94 to 61.89 % onto CSD, and 81.96 to
66.34 % onto ZnOnp-CSD matrix. And for adsorption of Cd (II) ions, the adsorption
efficiency reduced from 65.95 to 49.01 % onto ZnOnp, 71.59 to 56.13 % onto CSD, and
79.38 to 61.23 % onto ZnOnp-CSD matrix.
Keywords: Adsorption, Nanotechnology, Heavy Metals, Matrix, Nanoparticles.