Imobilização de íons férricos em acetato de celulose e sua aplicação na degradação de corantes reativos

Abstract

Effluents from the textile industry have strong color and high organic load due to the use of reactive dyes in the dyeing steps. Due to the high resistance of these dyes to traditional treatment, new alternatives and technologies have been studied. The Fenton reaction, based on the catalytic decomposition of hydrogen peroxide in acid medium (Fe²+/H2O2) is a process of great potential for the treatment of effluents. The process promotes the efficient degradation of many pollutants, however, this efficiency can be improved if the system is assisted by a radiation source, known as photo-Fenton. Precise control of pH is a disadvantage of the method, since in alkaline pH is the precipitation of Fe3+ thereby reducing its efficiency. To solve this problem, the use of immobilized forms of iron have been used. Thus, the main goal of this paper is to present a study to develop ways of Fe3+ immobilized in cellulose acetate and its use in the degradation of reactive dye effluent and a natural process by Fenton-like type. The material was characterized by infrared spectroscopy, atomic absorption spectroscopy, thermal analysis, scanning electron microscopy and ultraviolet-visible spectroscopy. The results of degradation studies demonstrated the catalytic efficiency of the material prepared in time for inferring the 30 minutes it was possible to observe the total decolorization of Reactive Black 5. In studies involving a natural textile effluent decolorization was 85.71% after 180 minutes of reaction.