info:eu-repo/semantics/bachelorThesis
Funcionalización y caracterización de una zeolita para la remoción de cobre, plomo y cadmio presentes en medios acuosos
Fecha
2022-02-25Registro en:
Armas Sandoval, Paola Belén; Calapaqui Vaca, Romel Omar. (2022). Funcionalización y caracterización de una zeolita para la remoción de cobre, plomo y cadmio presentes en medios acuosos. Escuela Superior Politécnica de Chimborazo. Riobamba.
Autor
Armas Sandoval, Paola Belén
Calapaqui Vaca, Romel Omar
Resumen
Heavy metals are considered as the main pollutants for the environment because of the toxicity they possess. The purpose of this study was the characterization and functionalization of a natural zeolite for removal of copper, lead, cadmium present in aqueous media. Taking advantage of one of its essential characteristics of this aluminosilicates, four tests were made with different modifiers giving a positive change for ethylenediaminetetraacetic acid (EDTA), chemical that acts like a ligand for the formation of complexes. Using an infrared spectrophotometer, the zeolite characterization tests were gotten and as a result a double peak of 2200 cm-1 was observed, which theoretically coincides with the peak of carboxylic acid. In addition, adsorption kinetics experiments were performed. These allowed to compare the natural and modified zeolite in order to determine the time required for equilibrium using the UV- VIS spectroscopy technique. On the metal solutions, 54 measurements were made controlling variables of adsorbent dose, concentration, stirring time, pH. It was possible to determine that, for copper lead and cadmium, in natural zeolite the ideal contact time is 90 minutes at a concentration of 100 ppm, to get a greater adsorption efficiency, for copper, lead and cadmium in modified zeolite the ideal contact time is 120 minutes at a concentration of 300 ppm. The results gained showed that for the zeolite functionality the values of copper, lead and cadmium were 95.51%, 68.19%, 94.48% respectively demonstrating that the zeolite was subjected to treatments of solutions three times more concentrated is more effective. It is recommended to perform the same experimental procedure using another type of zeolite.