CARACTERIZAÇÃO TECNOLÓGICA DE UMA ZEÓLITA EXAURIDA, PARA REMOÇÃO DE ÍONS Mn2+

Autor: Versiane Albis Leão, Flávia Donária Reis Gonzaga, Emmanoelle Cintra da Cunha
Rok vydání: 2018
Předmět:
Zdroj: Repositório Institucional da UFOP
Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
ISSN: 2176-1523
DOI: 10.4322/2176-1523.1185
Popis: As zeólitas apresentam importante propriedades fisico-químicas que aliadas a sua disponibilidade e seu baixo custo viabilizam sua aplicação em vários processos industriais. Atualmente tem-se dado enfoque para utilização de zeólitas na adsorção de metais no tratamento de água e de efluentes industriais. Assim, o presente trabalho teve como objetivo a caracterização tecnológica de uma zeólita, visando atestar a viabilidade de sua utilização na remoção de íons Mn2+(aq) em diferentes condições experimentais. O material utilizado neste trabalho era uma zeólita sintética exaurida utilizada como catalisador no craqueamento de petróleo. Inicialmente, realizou-se a ativação da zeólita com solução de NaOH, 1 mol.L-1. Em seguida, foi feita a caracterização da mesma e sua aplicação nos ensaios de adsorção com solução sintética de Mn2+ a 50 mg.L-1, realizados em batelada. Foram investigados valores de pH entre 4 e 8, e temperatura entre 25°C e 70°C. Observou-se que a zeólita foi identificada, por difração de raios-X, como Faujasita. O pH ótimo de adsorção sem risco de remoção por precipitação foi de 6,5 e a melhor temperatura, 25°C. O tempo de equilíbrio da adsorção do Mn2+(aq) por adsorção foi de 4 horas. Nessas condições, obteve-se um carregamento de 10,8 mg Mn2+-g zeólita. Os resultados mostraram o potencial de aplicação deste material para processos de remoção de íons manganês presentes em soluções aquosas. Zeolites have important chemical properties which combined with their availability and low-cost support their application in various industrial processes. Currently, much attention has been given to their use for metal sorption from wastewaters and industrial effluents. Therefore, the present study carried out a technological characterization of a waste zeolite sample followed by assessing its application in the removal of Mn2+ ions in different experimental conditions. The material used in this work was a spent synthetic zeolite used as a petroleum cracking catalyst. The zeolite was firstly washed in a 1 mol.L-1 NaOH solution. After characterization, batch sorption experiments were carried out with 50 mg.L-1 Mn2+ synthetic solutions. The pH values were set between 4 and 8 and temperature in the 25-70°C range. The zeolite phase was identified by X-ray diffraction as faujasite. The optimum pH for manganese sorption was 6.5 and the optimum temperature value was 25°C. The time required for equilibrium to be achieved was 4 hours, which enabled to attain a loading of 10.8 mg Mn2+/g zeolite. The results herein presented confirmed the potential application of this material for manganese ions sorption.Zeolites have important chemical properties which combined with their availability and low-cost support their application in various industrial processes. Currently, much attention has been given to their use for metal sorption from wastewaters and industrial effluents. Therefore, the present study carried out a technological characterization of a waste zeolite sample followed by assessing its application in the removal of Mn2+ ions in different experimental conditions. The material used in this work was a spent synthetic zeolite used as a petroleum cracking catalyst. The zeolite was firstly washed in a 1 mol.L-1 NaOH solution. After characterization, batch sorption experiments were carried out with 50 mg.L-1 Mn2+ synthetic solutions. The pH values were set between 4 and 8 and temperature in the 25-70°C range. The zeolite phase was identified by X-ray diffraction as faujasite. The optimum pH for manganese sorption was 6.5 and the optimum temperature value was 25°C. The time required for equilibrium to be achieved was 4 hours, which enabled to attain a loading of 10.8 mg Mn2+/g zeolite. The results herein presented confirmed the potential application of this material for manganese ions sorption.
Databáze: OpenAIRE
Externí odkaz: