Paulo H. Fernandes Pereira, Andressa I. C. da Silva, Rennan F. S. Barbosa, Valdeir Arantes, Daniella R. Mulinari, Derval S. Rosa
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Insights in the adsorption of eco-friendly starch hydrogel
This work prepared a class of starch hydrogel with and without lignin from sugarcane bagasse (5% wt.) and trisodium citrate as a crosslinking agent. The physical and chemical properties of the hydrogels were characterized by Fourier-transformed infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), and X-ray diffractometry (XRD) techniques. Besides, the swelling degree and the pH of zero point charge (pHzpc) were evaluated. Hydrogels were tested for the adsorption of potentially toxic elements (PTEs) and dye (methylene blue) by chromatography and UV-vis, respectively. FTIR confirmed that the reticulation of the starch structure successfully occurred, while the inclusion of lignin promoted new interactions that increased pore size, swelling degree, and pHzpc of the developed hydrogels. The adsorption of cationic metals at pH < pHzpc showed low removal but presented complete adsorption of oxyanion chromium. Moreover, the adsorption of methylene blue presented removal higher than 90%, further enhanced by lignin presence, which presented an adsorption capacity of 99.4 mg.g−1 at 70 min. The hydrogels presented a better fit to the Freundlich isotherm model, indicating that removal is favorable. Thus, using lignin in the hydrogels can enhance their performance and be an alternative to developing new eco-friendly materials.
期刊介绍：
The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news.
Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design.
Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.
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