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Chemical modification of cellulose with ionic functional groups for the elimination of compounds with ionic and aromatic nature present in tequila vinasses
Vinasses are the waste from the tequila process related to environmental problems in the producing areas of this type of alcoholic beverages in Mexico. Among its chemical composition are compounds with nitrogen and of aromatic rings such as melanoidins which their chemical structure is not completely known. However, their general composition driven to aromatic and ionic nature was already reported by Theodoros (2014). The interest in these compounds lies in the characteristic color of these wastes, which has as a consequence a strong environmental impact by not allowing the passage of light in the water streams where they are discharged. Besides they are considered also responsible for the high values of chemical oxygen demand (COD). Due to melanoidin structures exhibit ionic and hydrophobic interactions, the best option for promoting the uptake of them is synthesizing materials with similar chemistry nature. In the present work, cellulose was chemically modified in order to obtain materials with ionic charges such as zwitterionic, cationic and anionic (properties conferred according to the compound used for the modification). The compounds used to confer these properties were tryptophan, N1-(3-Trimetoxisililpropyl)diethylendiamine and succinic anhydride, respectively. These synthesized materials were spectroscopically characterized and their capacity to eliminate compounds with ionic and aromatic nature present in the tequila vinasse was evaluated by means of its adsorption kinetic and maximum capacity of adsorption. Since vinasse is a complex mixture of compounds to analyze selectively the concentration of any of them, a method based on the lambert-beer equation and integrals system along the active UV-Vis absorption region is proposed.