Avaliação da adsorção/dessorção de corante têxtil em bagaço de malte

Abstract

The textile industry grows every year and deserves special attention due to the large quantity of generated effluents, containing dyes, which are not fixed in the fibers. Pollution, due to dyeing, represents 30 to 40% of the total organic charge of a textile industry, which can affect the environment if discarded incorrectly. Some industrial or agricultural process residues may be used as adsorbents source, mainly those available in high amount and low cost. Therefore, the objective of this work was to evaluate and desorption of reactive dye in malt bagasse. Were performed the experiments in batch with solutions at pH 3. Was evaluated the effect of pH and zero load point for the pre-treated malt bagasse and determined the eluent for the desorption tests determined the eluent for the desorption tests performed at temperatures of 30, 40 and 50 °C. The results demonstrate that dye’s solutions with final pH near the PhPCZ, to influence significantly the dye adsorption, being the maximum removal capacity of 14,44 mg g-1. The eluent chosen was NaOH 0.005 mol L-1, which removed 49,5% of dye. Desorption kinetics occurs quickly and at the first hour of contact, the desorption percentage of 47,04, 53,46 and 50,35% for temperatures 30, 40 and 50 °C, respectively. In such a way, pre-treated malt bagasse demonstrated great potential for using like bio adsorbent in the removal of textile dye and that the dessorption process was shown to be promising, since it is possible to recover about 50% of the dye.