Adsorption characteristics of nickel (II) from aqueous solutions by Zeolite Scony Mobile-5 (ZSM-5) incorporated in sodium alginate beads

• Published in: Scientific reports Vol. 13; no. 1; p. 19601
• Main Authors: Hellal, Mohamed S., Rashad, Ahmed M., Kadimpati, Kishore K., Attia, Sayed K., Fawzy, Mariam E.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 10.11.2023; Nature Publishing Group; Nature Portfolio
• Subjects: 639/925/357/1015; 639/925/357/354; 704/172/169; 704/172/4081; Adsorption; Alginic acid; Anthropogenic factors; Aqueous solutions; Dosage; Free energy; Humanities and Social Sciences; Metal concentrations; Metal ions; multidisciplinary; Nanoparticles; Nickel; Science; Science (multidisciplinary); Sodium; Sodium alginate; Sorption; Zeolites
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-023-45901-x

Nickel, a prevalent metal in the ecosystem, is released into the environment through various anthropogenic activities, leading to adverse effects. This research explored utilizing zeolite scony mobile-5 (ZSM-5) nanoparticles encapsulated in sodium alginate (SA) for nickel (II) removal from aqueous solutions. The adsorption characteristics of SA/ZSM-5 were examined concerning contact duration, initial metal ion concentration, pH level, temperature, and sorbent dosage. The findings revealed that a rising pH reduced Ni (II) uptake by the sorbent while increasing the Ni (II) concentration from 25 to 100 mg L −1 led to a decrease in removal percentage from 91 to 80% under optimal conditions. Furthermore, as sorbent dosage increased from 4 to 16 g L −1 , uptake capacity declined from 9.972 to 1.55 mg g −1 . Concurrently, SA/ZSM-5 beads' Ni (II) sorption capacity decreased from 96.12 to 59.14% with a temperature increase ranging from 25 to 55 °C. The Ni (II) sorption data on SA/ZSM-5 beads are aptly represented by Langmuir and Freundlich equilibrium isotherm models. Moreover, a second-order kinetic model characterizes the adsorption kinetics of Ni (II) on the SA/ZSM-5 beads. A negative free energy change (ΔG°) demonstrates that the process is both viable and spontaneous. The negative enthalpy values indicate an exothermic nature at the solid–liquid interface while negative entropy values suggest a decrease in randomness. In conclusion, this novel adsorbent exhibits promise for removing nickel from aqueous solutions and could potentially be employed in small-scale industries under similar conditions.