Novel Collagen-Chitosan Based Hydrogels Reinforced with Manganite as Potential Adsorbents of Pb 2+ Ions
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ORIGINAL PAPER
Novel Collagen‑Chitosan Based Hydrogels Reinforced with Manganite as Potential Adsorbents of Pb2+ Ions Jesús A. Claudio‑Rizo1 · Nidia G. Burciaga‑Montemayor1 · Lucia F. Cano‑Salazar1 · Tirso E. Flores‑Guía1 · Denis A. Cabrera‑Munguía1 · Adan Herrera‑Guerrero2 · Florentino Soriano‑Corral2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The contamination of water by P b2+ ions is a problem that requires an imminent solution. Design of hydrogels based on polymers as well as inorganic phases is an innovative alternative for the generation of matrices with adapted properties. This work proposes the synthesis of a novel composite hydrogel based on collagen-polyurethane-chitosan reinforced with manganite; this inorganic phase increases the velocity of the adsorption process of the P b2+ ions. The effect of the concentration of manganite on the properties of composite hydrogels is studied. The results indicate that the composite reinforced with manganite presents an amorphous structure, improved mechanical properties and resistance to the both acidic and proteolytic degradation. The hydrogel with 35 wt% of manganite show a removal rate of P b2+ of 91 ± 6% at 24 h. These hydrogel composites could represent an efficient and sustainable alternative for the removal of Pb2+ ions from contaminated water. Graphic Abstract
Keywords Hydrogel · Composite · Collagen · Chitosan · Manganite · Adsorption · Pb(II) Extended author information available on the last page of the article
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Introduction Industrial activities such as mining and automotive are involved on the alteration of water quality, since as they generate effluents contaminated with Pb2+ ions [1–3]. The health effects of this ion vary according to the amount and time of exposure. A chronic exposure can lead to serious problems such as: anemia, cancer, kidney problems, nervous system damage, slow intellectual development in children, among others [4–6]. Different methods are being used to combat the presence of said heavy metal in water. The selection of a particular technique will depend on several factors, among which the concentration of the contaminant and the cost of the method are the most important. The conventional techniques for the removal of heavy metal ions in water are: oxidation, reduction, bioremediation, reverse osmosis, electrochemical treatment, coagulation, softening with lime, precipitation, filtration by membranes and ion exchange and adsorption [7, 8]. Adsorption is a process that occurs when chemical species accumulate on the surface of a solid or liquid (adsorbent), forming a molecular or atomic film (adsorbate). The main agent of this technique is the adsorbent which is selected depending on the metal ion of interest, its concentration, efficiency and its adsorption capacity [9]. There are several natural materials that have characteristics of an adsorbent, among them: chitin, chitosan, collagen, zeolite, clay, peat moss, wood and coal, they have been successfully
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