Análise do potencial da casca de guariroba, syagrus oleracea, na adsorção de azul de metileno: um estudo de bioadsorventes

Abstract

The use of bioadsorbents derived from agricultural and industrial biomass waste has shown promise in the preparation of bioadsorbents for wastewater treatment. This study aimed to investigate the adsorption capacity of guariroba bark (Syagrus oleracea) for removing methylene blue dye from an aqueous solution. The adsorbent was prepared from guariroba bark collected at farmers' markets in the cities of Goiânia and Aparecida de Goiânia. After cleaning and grinding, the resulting material was dried under different temperatures and durations, resulting in two samples: B1 (120°C for 48 hours) and B2 (50°C for 72 hours).

The adsorbents were characterized for the presence of acidic and basic groups using the Boehm method and subsequently subjected to methylene blue adsorption tests using UV-vis spectroscopy at λ = 665 nm. The morphology was analyzed using Scanning Electron Microscopy (SEM). The tests for acidic and basic groups indicated that both B1 and B2 contained carboxylic acids. Adsorption analysis showed that B1 adsorbed 97.93%, while B2 adsorbed 82.6%. B1 likely performed better due to its more acidic characteristics and a higher presence of carboxylic groups. The studies demonstrated that guariroba bark has potential as a bioadsorbent.