PHOTOCATALYTIC DEGRADATION OF XYLENOL ORANGE DYE BY MAGNETIC FE3O4.TIO2 NANOPARTICLES USING LIGHT EMITTING DIODE (LED)
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Date
2024-10-29
Authors
Abbas, Nadeen
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Publisher
An-Najah National University
Abstract
The aim of this study is to develop a new effective and economical photocatalysis method to purify water from organic dyes under visible light radiation. This is achieved by synthesizing a new photocatalyst that has a small band gap; to make it active under light emitting diode (LED) radiation, and it has magnetic properties that simplify purification of the catalyst post treatment. In this study, the magnetic nano particles of 10%TiO2/Fe3O4 were synthesized under basic conditions. The point of zero charge (PZC) of the synthesized photocatalyst was found to equal 4.69. Magnetic nano particles were used as a photocatalyst to purify water from Xylenol Orange Sodium Salt organic dye under LED radiation.
The photocatalytic properties of the synthesized catalyst were analyzed across various parameters, and by referring to the change in the UV-Vis spectrum of the solutions. It was noticed that the synthesized nano particles have the same photocatalytic effect of rutile TiO2, but they are easier to purify post treatment. Different parameters affecting the photocatalysis were studied such as time, pH of the medium, concentration of Xylenol Orange, amount used of the catalyst, and H2O2. It was observed that the photocatalytic efficiency is unaffected by the concentration of the Xylenol Orange solution but decreases as the amount of 10%TiO2/Fe3O4 increases. Also, photocatalysis was found to favor acidic conditions with pH ~ 3, and favor presence of H2O2. A kinetic study was conducted, it was found that the degradation increases with time, and the rate of the reaction follows the second order rate. The possibility of catalyst’s recovery after treatment was examined using several washing solutions. Ethanol was found to be the optimal solution to recover the nano particles post treatment. Also, it was found that the nano particles preserved both magnetic and photocatalytic properties. It was confirmed that the photocatalyst could be used at least in four cycles of photocatalysis. In conclusion, the synthesized magnetic nano particles of 10%TiO2/Fe3O4 could be used efficiently as a photocatalyst under LED radiation to degrade organic pollutants while being both economically and environmentally friendly.