This work evaluates the use of a synthetic NaP1 zeolite obtained from a hazardous Al-containing waste for the removal of ammonium\n(NH4\n+) from aqueous solutions by batch experiments. Experimental parameters, such as pH (6â??8), contact time (1â??360 min),\nadsorbent dose (1â??15 g/L), and initial NH4\n+ concentration (10â??1500 mg/L), were evaluated. Adsorption kinetic models and\nequilibrium isotherms were determined by using nonlinear regression. The kinetic was studied by applying both the pseudo-firstorder\nand pseudo-second-order models. The equilibrium isotherms were analyzed according to two-parameter equations\n(Freundlich, Langmuir, and Temkin) and three-parameter equations (Redlichâ??Peterson, Sips, and Toth). The results showed that the\nNH4\n+ uptake on NaP1 was fast (15 min) leading to a high experimental sorption capacity (37.9 mg/g). The NH4\n+ removal on NaP1\nwas a favorable process that followed the pseudo-first-order kinetic model. The NH4\n+ adsorption was better described by the Sips\n(54.2 mg/g) and Toth (58.5 mg/g) models. NaP1 zeolite from Al-waste showed good NH4\n+ sorption properties, becoming a potential\nadsorbent to be used in the treatment of contaminated aqueous effluents. Thus, a synergic effect on the environmental protection can\nbe achieved: the end of waste condition of a hazardous waste and the water decontamination.
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