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oai:docta.ucm.es:20.500.14352/187182024-07-22T18:11:37Zcom_20.500.14352_14col_20.500.14352_15

Al-Waste-Based Zeolite Adsorbent Used for the Removal of Ammonium from Aqueous Solutions Sánchez-Hernández, Ruth Padilla, Isabel López De Andrés, María Sol López Delgado, Aurora 550.4 549.67 Edafología (Geología) Geoquímica Mineralogía (Geología) Hidrología 2511 Ciencias del Suelo (Edafología) 2503 Geoquímica 2506.11 Mineralogía 2508 Hidrología This work evaluates the use of a synthetic NaP1 zeolite obtained from a hazardous Al-containing waste for the removal of ammonium (NH4+) from aqueous solutions by batch experiments. Experimental parameters, such as pH (6–8), contact time (1–360 min), adsorbent dose (1–15 g/L), and initial NH4+ concentration (10–1500 mg/L), were evaluated. Adsorption kinetic models and equilibrium isotherms were determined by using nonlinear regression. The kinetic was studied by applying both the pseudo-first-order and pseudo-second-order models. The equilibrium isotherms were analyzed according to two-parameter equations (Freundlich, Langmuir, and Temkin) and three-parameter equations (Redlich–Peterson, Sips, and Toth). The results showed that the NH4+ uptake on NaP1 was fast (15 min) leading to a high experimental sorption capacity (37.9 mg/g). The NH4+ removal on NaP1 was a favorable process that followed the pseudo-first-order kinetic model. The NH4+ adsorption was better described by the Sips (54.2 mg/g) and Toth (58.5 mg/g) models. NaP1 zeolite from Al-waste showed good NH4+ sorption properties, becoming a potential adsorbent to be used in the treatment of contaminated aqueous effluents. Thus, a synergic effect on the environmental protection can be achieved: the end of waste condition of a hazardous waste and the water decontamination. Ministerio de Economía y Competitividad (MINECO) Depto. de Mineralogía y Petrología Fac. de Ciencias Geológicas TRUE pub 2023-06-17T22:38:23Z 2023-06-17T22:38:23Z 2018 journal article https://hdl.handle.net/20.500.14352/18718 687-806X, ESSN: 1687-8078 10.1155/2018/1256197 eng CTM2012-34449 BES-2013-066269 Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ open access application/pdf Hindawi Publishing Corporation