Hidrogéis á base de acrilamida e acrilato para remoção de azul de metileno

Abstract

As textile industry has evolved, there is a worry with textile effluent discharge and its environmental problems. It has been used many techniques to remove textile dyes. Hydrogels have been shown as a viable alternative to minimize the textile dye removal from industrial effluents. These polymers can absorb and retain a large amount of aqueous solvent without dissolving. In addition, they can interact through hydrogen bond and/or electrostatic interactions with many compounds. Because of which, these materials have become more versatile. In this work, it was studied the adsorption of methylene blue (MB) by Pam Acril 0,2 mol% (PA 0,2) and 1,5 mol% (PA 1,5) of cross-link agent. Pam Acril is a copolymer based on acrylamide and potassium acrylate that presents an anionic structure, which has a great potential to adsorb cationic dyes. Adsorption experiments were performed in batch and the variation of dye concentration was verified by spectrophotometry. Adsorption kinetics shown Pam Acril 0,2 mol% and 1,5 mol% adsorb methylene blue following a pseudo-second order model. Through adsorption isotherms it was verified PA 0,2 adsorbs this dye according to Freundlich model, which applies to multi-layer adsorption processes. Infrared spectra also shown there are interactions between gel and dye. Removal efficiencies at all studied temperatures were up to 94% showing this copolymer has a great potential to remove methylene blue in industrial effluents.