7th IMRMPT

Abstract

Abstract information

English title:	Cyclic use of a pumice-based geopolymer for the removal of cadmium present in industrial effluents
Spanish title:	Uso c�clico de un Geopolimero a base de piedra p�mez para la remoci�n de cadmio presente en efluentes industriales
English abstract:	The increase in population, urbanization, technological advances and industrial production, have generated continuous degradation of the environment derived from discharges and production of waste and by-products, such as tanneries, electroplating, metal finishes, among other; releasing wastewater with heavy metals into natural sources. These pollutants are harmful to living beings due to their persistence, prevalence, and toxicity. Consequently, new materials called geopolymers have been used, which act as adsorbents due to their high efficiency in the removal of contaminants and easy synthesis, however, the possibility of reusing them to extend their useful life has not been widely studied, Because of that, various technologies have been implemented to regenerate the material and thus reuse it, such as thermal and chemical treatment, through the use of acids and high temperatures. In the present work, the cyclical use of a pumice-based geopolymeric material was evaluated, which was previously contaminated with a cadmium sulfate solution and subsequently subjected to chemical treatment with a hydrochloric acid solution to eliminate the heavy metal present. The geopolymer was synthesized following the methodology defined in previous works by the authors, after this, it was characterized by X-ray diffraction, to see the change in the structure of the precursor with respect to the synthesized material, verifying the formation of silicate networks; scanning electron microscopy where the difference in morphology between the pumice stone and the geopolymer was observed, finding for the first characteristic homogeneous surfaces and for the geopolymer agglomerates with heterogeneous surfaces. For the sorption tests, the dose of geopolymer used was 0.2 grams in contact with 25 mL of 2 ppm cadmium sulfate solution for 3 hours. For the desorption stage, 0.05 grams of contaminated geopolymer were used in contact with 25 mL of a 0.05 M solution of hydrochloric acid for 2 hours. Finally, the sorption and desorption percentages were determined in the aqueous phase using the atomic absorption technique, these measurements showed that the material presents up to four cyclical uses, maintaining adsorption percentages between 90% and 97% and desorption between 70% and 85%. demonstrating that the material is suitable for adsorption-desorption processes of pollutants present in water.
Spanish abstract:	El aumento de la poblaci�n, la urbanizaci�n, los avances tecnol�gicos y la producci�n industrial, han generado la degradaci�n continua del medio ambiente derivada de descargas y producci�n de residuos y subproductos, como es el caso de las curtiembres, la galvanoplastia, acabados de metales, entre otras; liberando a las fuentes naturales aguas residuales con metales pesados. Estos contaminantes son perjudiciales para los seres vivos debido a su persistencia, prevalencia y toxicidad. Por lo anterior, se han empleado nuevos materiales denominados geopol�meros, los cuales act�an como adsorbentes por su alta eficiencia en la remoci�n de contaminantes y f�cil s�ntesis, sin embargo, la posibilidad de reutilizarlos para alargar su vida �til no ha sido ampliamente estudiada, debido a esto, se han implementado diversas tecnolog�as que permitan regenerar el material y as� reutilizarlos, tales como tratamiento t�rmico y qu�mico, mediante el uso de �cidos y altas temperaturas. En el presente trabajo se evalu� el uso c�clico de un material geopolim�rico a base de piedra p�mez, el cual fue previamente contaminado con una soluci�n de sulfato de cadmio y posteriormente sometido a tratamiento qu�mico con una soluci�n de �cido clorh�drico para eliminar el metal pesado presente. El geopol�mero se sintetiz� siguiendo la metodolog�a definida en trabajos previos de los autores, posterior a ello se caracteriz� mediante difracci�n de rayos X, para ver el cambio de la estructura del precursor con respecto al material sintetizado, comprobando la formaci�n de redes siliato; microscopia electr�nica de barrido en donde se observo la diferencia de la morfolog�a entre la piedra p�mez y el geopol�mero, encontrando para el primero superficies homog�neas caracter�sticas y para el geopol�mero aglomerados con superficies heterog�neas. Para las pruebas de sorci�n la dosis de geopol�mero utilizada fue de 0,2 gramos en contacto con 25 mL de soluci�n 2 ppm de sulfato de cadmio durante 3 horas. Para la etapa de desorci�n se utilizaron 0,05 gramos de geopol�mero contaminado en contacto con 25 mL de una soluci�n 0,05 M de �cido clorh�drico durante 2 horas. Finalmente, los porcentajes de sorci�n y desorci�n fueron determinados en la fase acuosa mediante la t�cnica absorci�n at�mica, estas medidas evidenciaron que el material presenta hasta cuatro usos c�clicos manteniendo porcentajes de adsorci�n entre 90% y 97% y de desorci�n entre 70% y 85%, demostrando que el material es apto para los procesos de adsorci�n-desorci�n de contaminantes presentes en aguas.
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Authors

Name	Institution	Email
Angela Marcela Monta�o Angarita	Universidad Industrial de Santander	amontano@uis.edu.co
Claudia Paulina Gonzalez Cuervo	Universidad Pontifica Bolivariana	claudia.gonzalez@upb.edu.co
Jose Carlos Gutierrez Gallego	Universidad Industrial de Santander	jcgutier@uis.edu.co
Lisi Mildred Rueda Duarte	Universidad Industrial de Santander	LISI.RUEDA@correo.uis.edu.co

Presentation

Room:	Principal Room
Date:	June 8, 2023
Hour:	08:00 - 08:20

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7^th IMRMPT
Seventh International Meeting for Researchers in Materials and Plasma Technology

Previous editions:

        1st IMRMPT 2011
        2nd IMRMPT 2013
        3rd IMRMPT 2015
        4th IMRMPT 2017
        5th IMRMPT 2019
        5+1 IMRMPT 2021

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