Effect of Dye Structure on the Photodegradation Kinetic Using TiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; Nanoparticles

Mohammad Raad,Akram Hijazi,Mounir Kassir,Houssein Bazzi,Hawraa Ayoub

doi:10.4236/msce.2017.56004

Effect of Dye Structure on the Photodegradation Kinetic Using TiO&lt;sub&gt;2&lt;/sub&gt; Nanoparticles

Mohammad Raad, Akram Hijazi + Show 3 more

Open Access

https://doi.org/10.4236/msce.2017.56004

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Abstract

In this study the effect of pH, adsorption behavior and the chemical struc-tures of two dyes (Methyl Orange and Bromothymol Blue) on the photo-degradation rate constant, was investigated. Adsorption isotherm shows that the adsorption amount of dyes on TiO2 surface is highly related to the pH of the solution and to the pKa of each dye. In acidic medium the adsorption percentage of Methyl Orange on TiO2 surface was 76% facing 5% for Bromothymol Blue. The kinetic study shows compatibility between the degradation rate constant and the adsorption percentage on the surface. In basic medium the adsorption percentage of Methyl orange and Bromothymol Blue is similar while the degradation rate of Methyl orange is two times faster than that of Bromothymol Blue which reveals the role of chemical structure in the photodegradation rate.

Highlights

Dyes decomposition from textile wastewater is recognized as an important environmental treatment due to their potential toxicity and coloration [1]
In basic medium the adsorption percentage of Methyl orange and Bromothymol Blue is similar while the degradation rate of Methyl orange is two times faster than that of Bromothymol Blue which reveals the role of chemical structure in the photodegradation rate
The nanoparticles are characterized by X-ray diffraction (XRD), and Zetaphorometer, the UV/visible spectroscopie was used to follow the variation of the concentration of dyes during photodegradation

Summary

Introduction

Dyes decomposition from textile wastewater is recognized as an important environmental treatment due to their potential toxicity and coloration [1]. Ayoub et al 32 sis, chemical precipitation, chemical oxidation and reduction, electrochemical precipitation have been employed for the removal of dyes from wastewater [3] [4] [5] [6] Among these approaches, photodegradation is considered as a promising technology because it is a versatile, low-cost and environmentally benign treatment for most of pollutants. Photodegradation is considered as a promising technology because it is a versatile, low-cost and environmentally benign treatment for most of pollutants They are based on the generation of the strongly oxidizing hydroxyl radicals (OH·).

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Conclusion