Mexican natural clinoptilolite treated with silver for DDD removal from water

Mexican natural clinoptilolite treated with silver for DDD removal from water

The capability of a natural clinoptilolite to remove DDD in function of the temperature and variation of silver concentration was studied. The MEB-EDX and BET tech­niques analyzed the natural and modified samples. By kinetic tests, it was found that equilibrium occurred at 180 minutes of contact and...

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Autores principales: Alvarado Ibarra, Juana, Terán-Samaniego, Karla, Vargas-Hernández, Diana, Bautista Olivas, Ana Laura
Formato: Online
Idioma:spa
Publicado em: Universidad de Sonora 2020
Acesso em linha:https://biotecnia.unison.mx/index.php/biotecnia/article/view/1308
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spelling biotecnia-article-13082022-05-31T17:20:08Z Mexican natural clinoptilolite treated with silver for DDD removal from water Clinoptilolita natural mexicana tratada con plata para remover DDD en agua Alvarado Ibarra, Juana Terán-Samaniego, Karla Vargas-Hernández, Diana Bautista Olivas, Ana Laura natural clinoptilolite, kinetic of removal, adsorption isotherms, dichlorodiphenyl dichloroethane, silver. clinoptilolita natural, cinética de remoción, isotermas de adsorción, diclorodifenil dicloroetano, plata. The capability of a natural clinoptilolite to remove DDD in function of the temperature and variation of silver concentration was studied. The MEB-EDX and BET tech­niques analyzed the natural and modified samples. By kinetic tests, it was found that equilibrium occurred at 180 minutes of contact and that silver increases the removal efficiency. The process displayed a chemisorption kinetic, since it was adjusted to the pseudo second-order model and the coef­ficients of determination varied in a range from 0.9933 to 0.9997. By the adsorption isotherms, the maximum adsorbed concentration was obtained at 0.19 mg/g. The data fit per­fectly to the Langmuir model, in which a decrease was ob­served in constant b, related to the adsorption energy, when there was an increase in temperature. The latter indicates a decrease in adsorption at high temperatures, with the order of adsorption being 25° C> 35° C> 45° C. It is concluded that the process is exothermic, since the adsorption was greater when the temperature lowered, corroborated by the calcula­tion of the thermodynamic parameters (ΔH °, ΔG ° and ΔS °). Se estudió el efecto de la temperatura y de la variación de la concentración de plata en una clinoptilolita natural para remover DDD. Mediante las técnicas MEB-EDX y BET se analizó a la muestra natural y modificada. En las pruebas cinéticas se encontró que el equilibrio se presenta a los 180 minutos de contacto y que la plata incrementa la eficiencia de remoción. El proceso presenta una cinética por quimisor­ción, ya que se ajustó al modelo de pseudo segundo orden y los coeficientes de determinación variaron en un intervalo de 0.9933 a 0.9997. Por las isotermas de adsorción se obtuvo que la máxima concentración adsorbida es de 0.19 mg/g y los datos ajustaron perfectamente al modelo de Langmuir, en el cual se observa que la constante b, relacionada con la energía de adsorción, disminuye cuando hay aumento en la temperatura, lo que indica un decremento de la adsorción a altas temperaturas, teniendo que el orden de adsorción es 25 °C > 35 °C > 45 °C. Se concluye que el proceso es de natu­raleza exotérmica, al tener que la adsorción es mayor cuando la temperatura es menor, corroborado por el cálculo de los parámetros termodinámicos (ΔH°, ΔG° y ΔS°). Universidad de Sonora 2020-09-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Original peer-reviewed articles Artículos originales evaluados por pares application/pdf text/xml https://biotecnia.unison.mx/index.php/biotecnia/article/view/1308 10.18633/biotecnia.v22i3.1308 Biotecnia; Vol. 22 No. 3 (2020): Septiembre-Diciembre; 146-155 Biotecnia; Vol. 22 Núm. 3 (2020): Septiembre-Diciembre; 146-155 1665-1456 1665-1456 spa https://biotecnia.unison.mx/index.php/biotecnia/article/view/1308/467 https://biotecnia.unison.mx/index.php/biotecnia/article/view/1308/521 Derechos de autor 2020 Biotecnia
institution Biotecnia
collection OJS
language spa
format Online
author Alvarado Ibarra, Juana
Terán-Samaniego, Karla
Vargas-Hernández, Diana
Bautista Olivas, Ana Laura
spellingShingle Alvarado Ibarra, Juana
Terán-Samaniego, Karla
Vargas-Hernández, Diana
Bautista Olivas, Ana Laura
Mexican natural clinoptilolite treated with silver for DDD removal from water
author_facet Alvarado Ibarra, Juana
Terán-Samaniego, Karla
Vargas-Hernández, Diana
Bautista Olivas, Ana Laura
author_sort Alvarado Ibarra, Juana
title Mexican natural clinoptilolite treated with silver for DDD removal from water
title_short Mexican natural clinoptilolite treated with silver for DDD removal from water
title_full Mexican natural clinoptilolite treated with silver for DDD removal from water
title_fullStr Mexican natural clinoptilolite treated with silver for DDD removal from water
title_full_unstemmed Mexican natural clinoptilolite treated with silver for DDD removal from water
title_sort mexican natural clinoptilolite treated with silver for ddd removal from water
description The capability of a natural clinoptilolite to remove DDD in function of the temperature and variation of silver concentration was studied. The MEB-EDX and BET tech­niques analyzed the natural and modified samples. By kinetic tests, it was found that equilibrium occurred at 180 minutes of contact and that silver increases the removal efficiency. The process displayed a chemisorption kinetic, since it was adjusted to the pseudo second-order model and the coef­ficients of determination varied in a range from 0.9933 to 0.9997. By the adsorption isotherms, the maximum adsorbed concentration was obtained at 0.19 mg/g. The data fit per­fectly to the Langmuir model, in which a decrease was ob­served in constant b, related to the adsorption energy, when there was an increase in temperature. The latter indicates a decrease in adsorption at high temperatures, with the order of adsorption being 25° C> 35° C> 45° C. It is concluded that the process is exothermic, since the adsorption was greater when the temperature lowered, corroborated by the calcula­tion of the thermodynamic parameters (ΔH °, ΔG ° and ΔS °).
publisher Universidad de Sonora
publishDate 2020
url https://biotecnia.unison.mx/index.php/biotecnia/article/view/1308
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