Capítulo de libroNanotechnology and the environment(2020) Gentile, Guillermina José; Fidalgo de Cortalezzi, María Marta"This chapter presents different phenomena that arise when nanomaterials reach the environment, with emphasis in water systems. Transformations on the surface of nanomaterials and nanoparticles because of adsorption of macromolecules and metals cations, as well as biological interactions alter their colloidal stability, originating in some cases homoaggregation or heteroaggregation, which in turn affects their fate and transport. Some engineering applications of nanomaterials are highlighted: as adsorbents, as enhancers of water filtration, providing antifouling, catalytic, and antibacterial activity, and as catalysts, giving special attention to photoactivity and to the removal of indoor air contaminants as volatile organic compounds." Capítulo de libroAlready used and candidate polymeric membranes for CO2 separation plants(2018) Gutiérrez, Juan Pablo; Ale Ruiz, Elisa Liliana; Erdmann, Eleonora"This chapter presents the already used polymeric membranes and the potential candidates for the CO2 acid gas separation. Mainly, this work describes the characteristics of each membrane and the differences according to transport properties, conditions, and quality of the products. In addition to this, the types of membranes according to their capacity to separate CO2 from sources such as CO2/CH4 mixture, natural gas, and flue gases are also described. Also, the energy requirement to accomplish a certain product specification is introduced, this last used for the transport of natural gas. Finally, the characteristics of the potential candidate membranes and challenges for industrial applications are summarized." Capítulo de libroChitosan: from organic pollutants to high-value polymeric materials(2017) Errea, María Inés; Rossi, Ezequiel; Goyanes, Silvia Nair; D'Accorso, Norma Beatriz"...chitosan has proved to be versatile for so many industrial applications and its versatility is the main value of this polymer. However, the lability at acidic pH of chitosan is a limiting factor that affects mainly its industrial implementation for the removal of metallic anions from water. In addition, the physical and mechanical properties may vary between two manufacturing batches due to the characteristic polydispersity of chitosan with respect to molecular weight and degree of acetylation. This variation could affect the industrial process and in some cases, when strict specifications are requested (e.g., drug delivery), increase the final cost of the product because a purification step prior to use is required. Briefly, despite of the disadvantages mentioned before, due to its great versatility, its nontoxicity, its biodegradability, and the fact that it has a renewable resource, the industrial interest in chitosan and its application has been increasing remarkably in the last years."