Adsorção de corante vermelho reativo bf-4b em efluentes aquosos utilizando semente de manga (mangifera indica l.) como bioadsorvente

The textile industries discard large quantities of waste water in water bodies containing high concentrations of dyes. This threatens human beings and aquatic life, making it difficult for sunlight to penetrate, preventing photosynthesis and ecosystems from performing their vital functions. One of the forms of treatment is the adsorption process in order to improve the water quality, allowing the separation of several components and have operational advantages. This process allows the reuse of agricultural waste, as an alternative method of adsorbents, so-called bio-adsorbents, thus benefiting the environment and reducing costs. In this context, the objective of this study was to evaluate the performance of two bioadhesives, the untreated mango seed (Mangifera Indica L.) and treated with sulfuric acid, in the removal of BF-4B reactive red dye. The bioadhesives were characterized by granulometry and zero load point (PCZ) techniques. Afterwards a kinetic study was carried out, applying the adsorption models. The untreated biosorbent (BST) had a 96.51% removal efficiency and treated biosorbent (BT) of 94.93%, at an initial concentration of 50 mg.L-1, a dosage of 4 gL-1 of bioadsorbent and pH equal to 1.0. The kinetic study showed that the data were better fitted to the Pseudo-second order model, to the BTS and to the Pseudo-first order model for BT. The bioadhesive studied is an alternative for the removal of dye, without the need to undergo a previous chemical treatment.