Removal of Acid Orange 74 from wastewater with TiO2 nanoparticle

Year 2019, Volume: 3 Issue: 1, 75 - 80, 15.04.2019

Gamze Topal Canbaz , Neşe Keklikçioğlu Çakmak , Atakan Eroğlu Ünsal Açıkel

Abstract

The use of nanomaterials in
wastewater treatment has gained importance. Nano-structured adsorbents have
good adsorption potential due to their properties such as large surface area. In
this study, removal of AO74 (Acid Orange 74) from the waters with TiO₂nanoparticles
were investigated. TiO₂ nanoparticles were synthesized by sol–gel
method. The X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and
Ultraviolet–visible spectroscopy
(UV–VIS) spectrometer techniques were used to characterize the synthesized
products. Stability analysis was performed by zeta potential analysis. The
anatase phase of the TiO₂ nanoparticles was confirmed by XRD
analysis. The SEM micrographs revealed the spherical-like morphology with
average diameter of about 32 nm which agrees with XRD results. FTIR spectra
show the vibrational mode of TiO₂ around 600 cm^-1.
Absorption peak in the UV region at 320 nm are observed. This peak is
characteristics of nano-sized TiO₂nanoparticles. If the measured
zeta potential absolute value is greater than 35 mV, it can be said that the
produced nanofluid is stable. The zeta potential value greater than 35 mV in
all measurements in this study, so that the synthesized TiO₂ nanoparticle
is stable in the fluid medium. pH (2-5), contact time (10-120 min) and initial dye
concentration (20-100 mg / L) were investigated to determine the adsorption
potential of TiO₂ nanoparticles. The optimum parameters for adsorption of AO74
were determined as pH and contact time, respectively: 5 and 75 minutes. The
adsorption system is compatible with Langmuir and Freundlich isotherms. As a
result, TiO₂ nanoparticles were identified as suitable adsorbent for
removal of AO74.

Keywords

Acid orange 74, Adsorption, TiO2 nanoparticle, Sol-gel

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