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Springer Science and Business Media LLC Scientific Reports 14(1)
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    초록·키워드

    To obtain high efficient elimination of ammonia (NH<sub>4</sub><sup>+</sup>) from wastewater, Cu(II), Ni(II), and Co(II)) were loaded on Dowex-50WX8 resin (D-H) and studied their removal efficiency towards NH<sub>4</sub><sup>+</sup> from aqueous solutions. The adsorption capacity of Cu(II)-loaded on D-H (D-Cu<sup>2+</sup>) towards NH<sub>4</sub><sup>+</sup> (q<sub>e</sub> = 95.58 mg/g) was the highest one compared with that of D-Ni<sup>2+</sup> (q<sub>e</sub> = 57.29 mg/g) and D-Co<sup>2+</sup> (q<sub>e</sub> = 43.43 mg/g). Detailed studies focused on the removal of NH<sub>4</sub><sup>+</sup> utilizing D-Cu<sup>2+</sup> were accomplished under various experimental conditions. The pseudo-second-order kinetic model fitted well the adsorption data of NH<sub>4</sub><sup>+</sup> on D-Cu<sup>2+</sup>. The non-linear Langmuir model was the best model for the adsorption process, producing a maximum equilibrium adsorption capacity (q<sub>max</sub> = 280.9 mg/g) at pH = 8.4, and 303 K in less than 20 min. The adsorption of NH<sub>4</sub><sup>+</sup> onto D-Cu<sup>2+</sup> was an exothermic and spontaneous process. In a sustainable step, the resulting D-Cu(II)-ammine composite from the NH<sub>4</sub><sup>+</sup> adsorption process displayed excellent catalytic activity for the degradation of aniline blue (AB) and methyl violet 2B (MV 2B) dyes utilizing H<sub>2</sub>O<sub>2</sub> as an eco-friendly oxidant.

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