Abstract:The use of powdered from orange peel (Citrus sinensis) as low cost adsorbent for the removal of the dye Direct Blue 86, routinely used in the textile industry, was the objective of this work. A porous structure compatible with the adsorption of molecules with dimensions of up to 15 micrometers was verified in the characterization of the orange peel powder (OPP). The OPP answered the ABNT NBR 2133 norm showing lower humidity content of 8%. The ash content indicated few impurities in the material, with a value of (2.79 ± 0.06)%. The methodology used in adsorption experiments did not allow quantification of the dye in the solutions, leading to an investigation of the possible causes. The results showed the D-limonene, orange peel component, as responsible for the non-viability of the methodology employed, so it was not possible to quantify the study through the contact time of variation (adsorption kinetics), pH, temperature and adsorption isotherm by this method.Keywords: Adsorption; Agro-industrial waste; Spectroscopy; Textile Industry; Color removal. ResumoO uso de pó de casca de laranja (Citrus sinensis) como adsorvente de baixo custo na remoção do corante Direct Blue 86, usado rotineiramente na indústria têxtil, foi o objetivo deste trabalho. Um estrutura porosa compatível com a adsorção de moléculas com dimensões de até 15 m foi verificada na caracterização do pó da casca da laranja (PCL). O PCL atendeu a norma ABNT NBR 2133 apresentando teor de umidade abaixo de 8%. O teor de cinzas indicou poucas impurezas no material, com valor de (2,79 ± 0,06)%. A metodologia empregada nos ensaios de adsorção não permitiu a quantificação do corante nas soluções, levando a uma investigação das possíveis causas. Os resultados apresentaram o D-Limoneno, componente da casca da laranja, como responsável pela inviabilização da metodologia empregada, portanto, não foi possível quantificar o estudo através da variação de tempo de contato (cinética de adsorção), pH, temperatura e isoterma de adsorção através deste método.
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