New Method for Removal of Organic Dyes Using Supported Iron Oxide as a Catalyst

Samia A Kosa,Eman Z Hegazy,Naha M Al-Sebaii,Islam H Abd El Maksod

doi:10.1155/2016/1873175

Samia A Kosa, Eman Z Hegazy + Show 2 more

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https://doi.org/10.1155/2016/1873175

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Abstract

In this study, we perform a catalytic decomposition of organic dye over Fe2O3-CeO2-TiO2-γ-Al2O3catalyst in the presence of molecular oxygen and chlorate ions. The results showed that organic dye acts as a sensitizer during this process. The mechanism of the allover process is hypothesized. Several techniques were employed for the characterization of the catalyst, including XRD, SEM, EDAX, and thermal analysis and catalytic activity. The analysis showed that iron is the main active centers, and we have two types of active centers in this process: surface iron and dissolved iron in titanium dioxide. The dissolved iron was found to be the most active center; however, after Fe/Ti = 2.76, a synergism was observed to be occurring between the two active centers.

Highlights

Organic dyes are used in a wide range of industrial applications [e.g., textiles, food products, cosmetics, pharmaceuticals, and paper printing], which means that they are frequently found in industrial wastewater
From the above study the following conclusions could be drawn: (1) Catalytic decomposition of organic dye can be performed with high efficiency using a Fe/Ce/Ti/alumina system
(2) The study of the effect of each component normalized to the others leads us to conclude that iron dissolved into titanium dioxide form the main contributed active centers in this process

Summary

Introduction

Organic dyes are used in a wide range of industrial applications [e.g., textiles (the most significant), food products, cosmetics, pharmaceuticals, and paper printing], which means that they are frequently found in industrial wastewater. Azo dyes are considered most effective and easier to use in industrial applications than dyes from natural sources. There is substantial research interest in these drawbacks of the use of azo dyes: many efforts have been devoted to developing methods of degradation of such dyes and to validating analytical methods for these processes. Wastewater generated by the textile industry generally contains a high content of large aromatic compounds in addition to toxic materials such as azo dyes, which are considered to be highly carcinogenic [4]. The generation of nascent atomic oxygen may be more efficient in such processes in achieving total decomposition of the organic pollutant. Such reactions usually occur in only a few minutes via a free radical mechanism. A comprehensive surface study will be performed to recognize the types of active centers and determine the mechanism of decomposition

Experimental

Procedure and Apparatus

Results and Discussion

Conclusions