Saidu, Usman
(2021)
Photocatalytic Degradation Of
Tetracycline In Aqueous Solution By
Zno Quantum Dots/Tio2 Supported
Catalysts.
PhD thesis, Perpustakaan Hamzah Sendut.
Abstract
In this research, TiO2 nanoparticles (TiO2 NPs) were incorporated with 3%,
5%, 8%, and 10% ZnO quantum dots (ZnO QDs) via sol-gel method. The
photocatalyts (xZnO QDs/TiO2; x= 3%, 5% 8% and 10%) were characterized using Xray
diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force
microscopy (AFM), high resolution transmission electron microscopy (HRTEM), field
emission scanning electron microscopy (FESEM), ultraviolet-visible diffuse
reflectance spectroscopy (UV-vis DRS) Brunauer-Emmett-Teller (BET), X-ray
photoelectron spectroscopy (XPS), and photoluminescence (PL) analyses. The
synthesized photocatalysts' efficiency in suspended form was tested in the
photodegradation of tetracycline (TC) under visible light irradiation. About 95%
degradation of TC was achieved within 90 min of visible light illumination using 8%-
ZnO QDs/TiO2, under the optimized conditions: TC concentration = 40 mg/L, pH = 9,
catalyst dosage = 250 mg/L. The 8%-ZnO QDs/TiO2 nanocomposite photocatalyst was
immobilized on linear low-density polyethylene (LLDPE) polymer using the solution
casting method. The LLDPE supported composite films (ZnO QDs/TiO2@LLDPE),
each with a different amount of 8%-ZnO QDs/TiO2 nanocomposite (2, 5, 8, and 10
wt.%) were characterized by FTIR, XRD, FESEM, UV-vis-DRS, AFM, water contact
angle, differential scanning calorimetry (DSC), and thermogravimetric (TGA)
analyses. Structural and morphological studies revealed that the nanocomposites were
homogenously dispersed and embedded onto the LLDPE matrix.
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