Extraction, characterization and application of lignin from cashew apple fiber pretreated with alkaline hydrogen

Abstract

The lignin resulting of pretreatment from cashew apple fiber with alkaline hydrogen peroxide in the process of bioethanol production was extracted, characterized and applied in the process of adsorption of the reactive blue dye Q-G125%. The effect of initial dye concentration, lignin load as adsorbent and temperature in adsorption were investigated. The lignin mass extracted was 12.69 g for each 100 g of in natura fiber. The extracted lignin showed characteristics similar to those mentioned in the literature. The maximum adsorption capacity (qe) was 90 mg/g obtained in the process at 25 °C, with initial dye concentration of 1000 mg.L-1 and adsorbent dosage of 5 g.L-1.