Biossorção do corante laranja Solimax TGL 182% utilizando a torta de chia

Abstract

Textile industry has a major environmental impact around the world, mainly considering the discharge of its effluents full of hazardous chemicals, whose treatment are complex and expensive. Nowadays, aproximately 60% of the produced dyes are consumed by this industry, mainly in the coloring step of the process. In fact, 10 to 15% of them are not treated before its discharging in the environment along with the textile industry wastewater, which are usually toxic, carcinogenic, hard to treat and prevent light from penetrating in the water, reducing considerably photosynthesis. The conventional treatments are usually expensive and not always effective. Thus, the aim of this work is to study the biossorption potential of the Solimax TGL 182% Orange Dye using chia pie in aqueous solution. Chia pie is a organic industrial residue from the chia seed oil extraction process, which currently has no viable applications or environmentally responsible destination for it. The characterization analysis was made using two different technics – Scanning Electron Microscopy (SEM) coupled with EDS (X-ray) and the second Fourier Transform Infrared Spectroscopy (FTIR). Preliminary testes have been made to evaluate the best operational parameters, that have been defined as pH2, agitation speed of 120 rpm, biomass without sieving and temperature of 30ºC. The kinetic, equilibrium and termodynamic testes have been performed in triplicate, batch process, controlling temperature, rotation and pH. Afterwards, the kinetic models have been adjusted to the experimental results obtained by the adsortion kinetics. The Pseudo-second order model led to the best adjustment. The equilibrium test tended a brach of the Langmuir model, although not completely characterized as expected, as seen in similar papers to the present work. At last, the thermodynamic tests determined a exothermal reaction.