La cáscara de yuca se modificó con ácido cítrico haciendo reaccionar la cáscara seca y molida con una solución acuosa de ácido cítrico a 60°C y ácido sulfúrico como catalizador, y posterior finalización de la reacción a 150 °C. Se prepararon soluciones sintéticas disolviendo 0,5 g de oro en una solución de 8 ml de HNO3 0,1 M y, posteriormente, se completó el volumen para obtener una concentración de oro de 500 mg/l. Se analizó la influencia de variables tales como la concentración inicial de oro, temperatura y pH durante el proceso de remoción para determinar las condiciones óptimas del proceso de recuperación. Los ensayos se realizaron en erlenmeyers con un agitador orbital discontinuo. Los datos de equilibrio y cinético se ajustaron a varios modelos comúnmente usados en la literatura.
Cassava peels were modified with citric acid by reacting the dried and milled peels with an aqueous solution of citric acid at 60 °C and sulfuric acid as catalysts, and subsequent heating at 150 °C for completion of the reaction. The synthetic solutions were preparing taking 0,5 g of metallic gold and dissolving it in a solution of 8 ml of HNO3 0,1 M; volume was completed until a solution of concentration in gold of 500 mg/L was reached. The influence of variables such as the initial gold concentration, temperature, and pH of the samples were analyzed in order to determine the optimum conditions in the recovery process. Experiments were carried out in Erlenmeyers in batch mode using an orbital shaker. The activation energy of the adsorption process was calculated as 157 + 14 kJ/mol. Gold removal values were found up to 99,58%, at a temperature of 45 ° C and pH of 10, these being optimal conditions.
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