Caroço de azeitona (Olea Europea L.): preparação, caracterização e sua aplicação como biossorvente na remoção do corante violeta de metila de solução aquosa

Abstract

In the present study, olive stones poder in natura (CA) was used as a biosorbent for the removal of violet methyl dye 10B (VM 10B) from aqueous solution. The CA was prepared and characterized by diferente analytical techniques. Influence of experimental conditions affecting adsorption capacity, such as amount of adsorbent mass, solution pH, agitation speed, initial dye concentration, contact time and temperature influence were investigated using the batch procedure. The favorable adsorption conditions of the VM 10B through CA were using 500 mg of adsorbent, agitation speed of 100 rpm, pH 8,0 and contact time of 45 minutes. The experimental kinetic data were evaluated using the pseudo first order, pseudosecond order, Elovich and intraparticle diffusion models. The adsorption modelo f pseudosecond order was that it better representes the adsorption kinetics VM 10B. The Langmuir, Freundlich, Sips, Liu, Temkim e Redlich-Peterson models were used to describe the mechanism of adsorbent-adsorbete interaction. The Liu model was the one that best fit the experimental data. Based on the Liu model the maximum adsorption capacity of the CA was 28,6 mg-¹ and 38,3 mg -¹ at 25ºC and 60ºC, respectively. After use CA, the same can be regenerated using 0,5 mol L-¹ acetic acid as the eluent. Thermodinamic adsorption studies show that adsorption of VM 10B in CA is na exothermic process governed by physosorption. The application of CA in the removal of VM 10B from synthetic textile effluents was satisfactory showing that in can be used in the treatment of colored industrial Waters.