Adsorção de atrazina por biocarvões produzidos a partir de subprodutos da indústria madeireira

Abstract

The present study evaluated the adsorption process and the ability of three biochars produced from wood at different pyrolysis temperatures to adsorb the herbicide atrazine. The three biochars were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and evaluated for characteristics: surface area, pore diameter, total pore volume and micropore volume by Brunauer- Emmett-Teller (BET). Evaluating the physical characteristics, it is possible to observe that BM350 has a relatively low specific surface area (0,973 m2 g-1) compared to BM450 and BM550 (2,879 m2 g-1). A greater variety of functional groups was detected in BM350, directly influencing the adsorption of atrazine. The adsorption process reached equilibrium at 480 hours for BM350, better explained by the pseudo first order model, 317 hours for BM450 and BM550, if framed in the kinetic model of pseudo-second order. The model that describes the atrazine adsorption process is better represented by the Freundlich isotherm model. Biochar produced from by-products of the wood industry is not suitable for the removal of the herbicide atrazine, its adsorption capacity being lower than other materials described in the literature.