Estudo da secagem do mesocarpo do coco verde (Cocus nucifera) e da sua utilização como adsorvente do corante azul cassafix CA-2G

Abstract

In the productive process of the textile industry have stages that uses dye, which generates effluents that can degrade the environment. This paper looks for producing an alternative adsorbent made from Green Coconut Mesocarp (MCV) for removing the Blue Cassafix - CA 2G, a reactive dye. The adsorbent was produced by drying the MCV in air circulation oven at temperatures of 60 and 80°C, among the tested models for the drying process, the Midili model fitted at most the experimental data. The factorial planning 2^4 analyzed the influence of variables: mass, concentration, pH and time; the factors mass and concentration were statistically significant while the factors pH and time had no influence to the process within the studied levels. In the factorial planning of 2^5 the analyzed variables were mass of MCV, dye concentration, pH, time and washing or not the MCV with an albumin solution; the pH was the only factor that did not show statistically significant effect in the process within the studied levels. The adsorption kinetics tests were carried out with the in naturain natura bioadsorbent and the adsorbent washed with albumin, with a volume of 25 mL of solution and concentration of 100 mg.L^-1, the pseudo-first order and the pseudo- second order models agreed to the experimental data. The best results of qt were found in the kinetics of adsorption with experiment 4, with 3.4 mg.g^-1. In the -1 equilibrium study, 10 erlemmeyers with concentrations ranging from 10 to 100 mg.L^-1 and 0.10 g of MCV were in contact for 30 min at 200 rpm, the Sips model had the best fit for the experimental data. The MCV has potential as a bioadsorbent, has low cost and is found in plenty.