The purpose of this study was to elaborate three-dimensional structures, by developing a series of biodegradable composite materials based on chemically modified sawdust (TSOH) and poly (methacrylic acid) (PMAA), adopting the method radical polymerization of methacrylic acid (AMA) and using azobisisobutyronitrile (AIBN) as initiator and tetraethyleneglycoldimethacrylate (TEGDMA) as crosslinking agent. Moreover, the various composite materials are obtained by varying the level of TSOH as reinforcement (10%, 50%, 70%). The spectral (FT-IR), morphological (SEM) and thermal (ATG) characterizations of the composite materials (PMAA / TSOH) provide an improvement in the physicochemical properties and ease implementation of the TSOH adsorbents. Subsequently, the composite materials (PMAA / TSOH) (90/10, 50/50, 30/70) are applied to the removal of methylene blue (MB) in aqueous solution in a comparative study with the TSOH material. To evaluate the effects of different conditions, including pH, contact time and temperature, on the methylene blue (MB) removal by composites, batch experiments were conducted. These results, obtained from adsorption, proved to be exothermic with the second order velocity kinetics, which followed the Freundlich isotherm. Experimental saturation capacities were 1434.38 and 1395.56, 1000.78 mg / g for (PMAA / TSOH) (30/70), (50/50) and (90/10) respectively. Negative changes in entropy (ΔS0) and heat of adsorption (ΔH0); and in the Gibbs free energy (ΔG0) indicated the possible and spontaneous adsorption of methylene blue on the composite adsorbents. These results indicate that chemical treatments make it possible to transform a low-value by-product of the wood industry into a useful adsorbent.
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