Adsorção do corante Rodamina B por casca do fruto da macaúba (Acromia aculeata)

Abstract

With the population increase, there is concern about the pollution of water and springs, in the Brazilian context, the textile industry plays a crucial role in the economy and job creation, but is responsible for environmental problems due to the high organic load and color present. in its effluents. Among the various synthetic dyes, Rhodamine B stands out, a cationic dye, belonging to the fluorone family, has high solubility in water and is widely used in various industries. Macaúba, coming from a common palm tree, emerges as a promising alternative for removing dyes through the adsorption process, which emerges as a viable technique in water treatment. The study evaluated the capacity of Macaúba bark as an adsorbent for the dye Rhodamine B. The proposed objectives were achieved, identifying ideal parameters, such as pH 4, achieving a removal of 52.2% of the dye, with a biosorbent dosage of 1.0 g L1. The biosorption capacity was 13.3 mg g-1 at 25°C and an initial concentration of 20 mg L-1. The pseudo-second order kinetic model was the most appropriate, presenting high coefficients of determination for different temperatures. The maximum adsorption capacity was 47.36 mg g-1 at 25°C, and the Langmuir isothermal model indicated adsorption on a homogeneous surface forming a monolayer. FTIR analyzes showed acidic groups on the surface of the material, indicating their participation in the adsorption process. Thermogravimetric analysis provided information about the thermal behavior and composition of Macaúba, while scanning microscopy showed an irregular surface with few pores. Macaúba bark is a viable and economical alternative for the adsorption of dyes, such as Rhodamine B.