Efeito dos tempos de moagem no Arundo donax L. após os pré-tratamentos químicos

Abstract

This work reports on pretreatments in obtaining different precursors of lignocellulosic materials to analyze grinding under the effects of the dry ball mill process at the Arundo Donax plant. The methods of this research were to analyze the behavior of precursors of the arundo plant obtained from the different grinding times of the raw material in natura and submitted to chemical pre-treatments (alkaline, acid and bleaching). The objective was to analyze the chemical characterization, structural and morphological properties of the different granulometries of pre-treatments, thus, the analyzes of chemical, colorimetric, density, granulometric and morphological characterization were carried out through analysis of scanning electron microscopy (SEM), thermogravimetric (TGA), Fourier Transform Infrared Spectroscopy (FTIR) and Structural Analysis through X-Ray Diffraction (XRD). In the results of this work, comparing all the samples, the chemical treatment with sodium hypochlorite stood out, which presented a high cellulose index, with smaller particle size, with greater luminosity and color change. Still, it reached greater density in the crystalline structure and considering the ideal time for milling is 10 hours for all pre-treatments. In this way, it appears that the low-cost grinding in a ball mill was efficient for reducing the particle size, and the final material obtained can be used for the elaboration of micro or nanostructured products, such as films and functionalized packaging.