7th IMRMPT

Abstract

Abstract information

English title:	Low cost geopolymers prepared from pumice Stone and the influence of the alkaline activator in the sorption of methylene blue
Spanish title:	Geopol�meros de bajo costo preparados a partir de piedra p�mez y la influencia del activador alcalino en la sorci�n del azul de metileno
English abstract:	The need to find new sorbent materials that are sustainable, efficient and economically viable has drawn the attention of researchers towards geopolymers. Particularly, there is a great interest in finding precursors that provide better properties to the product and likewise, establish the most convenient synthesis parameters for their application as sorbents. Therefore, in this investigation the removal efficiency of methylene blue (AM) from synthetic aqueous solutions was determined using synthesized geopolymers based on pumice stone (PP) substituted with 10 and 15% alumina, conditions established from the results. of XRF of the PP. Alkaline activator solutions composed of sodium silicate and sodium hydroxide in a range of concentrations were used and from the AM removal tests the materials with the best performance in the removal process were determined, these being the ones synthesized with 9M concentration. These materials and their precursor were characterized by XRD, SEM-EDS, and FTIR and physisorption analysis. From XRD, the appearance of new crystalline phases and the increase of some amorphous areas after the geopolymerization process were observed. In turn, using SEM-EDS, morphological differences were established between the precursor, which presented a smooth surface, and the geopolymers, in which rough surfaces appeared, which were associated with the incorporation of aluminum in the three-dimensional structure formed, which also it was observed by changes in the bands of the FTIR spectra. Physisorption analyzes revealed the mesoporous structure of the material. Finally, the best conditions of the removal process corresponding to a pH of 10 of the AM solution, 0.2 g sorbent dose, 15 ppm initial sorbate concentration and 3h contact time were established; observing a great influence of electrostatic interactions and phenomena such as material saturation in the removal process. The isotherms exhibited the presence of physisorption phenomena, although the kinetic models suggested that chemisorption limited the rate of the process. The results obtained show the usefulness of the material in the removal of methylene blue with removal efficiencies of up to 89.2%.
Spanish abstract:	La necesidad de encontrar nuevos materiales sorbentes que sean sostenibles, eficientes y viables econ�micamente ha atra�do la atenci�n de los investigadores hacia los geopol�meros. Particularmente, existe un gran inter�s en encontrar precursores que brinden mejores propiedades al producto y as� mismo, establecer los par�metros de s�ntesis m�s convenientes para su aplicaci�n como sorbentes. Por consiguiente, en esta investigaci�n se determin� la eficiencia de remoci�n de azul de metileno (AM) de soluciones acuosas sint�ticas usando geopol�meros sintetizados a base de piedra p�mez (PP) sustituida con 10 y 15% de al�mina, condiciones establecidas a partir de los resultados de FRX de la PP. Se utilizaron soluciones de activador alcalino compuestas por silicato de sodio e hidr�xido de sodio en un rango de concentraciones y a partir de las pruebas de remoci�n de AM se determinaron los materiales con mejor desempe�o en el proceso de remoci�n, siendo estos los sintetizados con concentraci�n 9M. Estos materiales y su precursor se caracterizaron mediante DRX, SEM-EDS y FTIR y an�lisis de fisisorci�n. A partir de DRX se observ� la aparici�n de nuevas fases cristalinas y el aumento de algunas �reas amorfas luego del proceso de geopolimerizaci�n. A su vez, mediante SEM-EDS se establecieron diferencias morfol�gicas entre el precursor, que present� una superficie lisa, y los geopol�meros, en los cuales aparecieron superficies rugosas, que se asociaron a la incorporaci�n de aluminio en la estructura tridimensional formada, lo cual tambi�n se observ� mediante cambios en las bandas de los espectros FTIR. Los an�lisis de fisisorci�n revelaron la estructura mesoporosa del material. Finalmente, se establecieron las mejores condiciones del proceso de remoci�n correspondientes a pH de 10 de la soluci�n de AM, dosis de sorbente de 0,2 g, concentraci�n inicial de sorbato de 15 ppm y tiempo de contacto 3h; observando una gran influencia de las interacciones electrost�ticas y fen�menos como la saturaci�n del material en el proceso de remoci�n. Las isotermas exhibieron la presencia de fen�menos de fisisorci�n, aunque los modelos cin�ticos sugirieron que la quimisorci�n limitaba la velocidad del proceso. Los resultados obtenidos evidencian la utilidad del material en la remoci�n de azul de metileno con eficiencias de remoci�n de hasta 89,2%.
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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
Daniela Alexandra Jerez Santamaria	Universidad Industrial de Santander	daniela.jerez@correo.uis.edu.co
Jose Carlos Gutierrez Gallego	Universidad Industrial de Santander	jcgutier@uis.edu.co
Giselle Carolina Bar�n Gualdr�n	Universidad Industrial de Santander	gcbarong@gmail.com

Presentation

Room:	Principal Room
Date:	June 8, 2023
Hour:	09:40 - 10:00

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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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