A novel removal of Ni ions from water solutions using dispersive solid-phase extraction method with nano FeO/chitosan-acrylamide hydrogel.

Environ Monit Assess

Department of Chemistry, Faculty of Pharmaceutical Chemistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.

Published: January 2024

AI Article Synopsis

  • The study focuses on the risks posed by Ni ions from effluent release to the environment and human health, and investigates a novel nano sorbent made of nano FeO/chitosan-acrylamide hydrogel for Ni ion extraction.
  • The method involved optimizing various parameters like pH and extraction time, achieving a concentration factor of 33.3 and a low relative standard deviation of 1.8%, demonstrating high extraction efficiency.
  • The adsorption mechanisms were analyzed using different models, finding that the process involved both physical and chemical adsorption, with the hydrogel showing effective removal of Ni ions from water samples.

Article Abstract

The effluent release containing heavy metals as Ni ions has drastic risks to both the natural environment and human health. In this research, the nano FeO/chitosan-acrylamide hydrogel was prepared as a novel nano sorbent for dispersive solid-phase extraction of Ni ions and applied to the water sample solution. The pH, amount and type of elution solvent, the extraction time, etc. were optimized to improve the efficiency of the proposed method. Analytical parameters such as concentration factor and relative standard deviation (%) were achieved as 33.3 and 1.8%, respectively. The capacity in equilibrium sorption was calculated at 22.54 mg g. Furthermore, to estimate the adsorption mode, Freundlich, Langmuir, and Temkin models were fitted with experimental isotherm data. Besides, to check the basic process of the metal adsorption mechanism, pseudo-first-order, pseudo-second-order, and Roginsky-Zeldovich models were investigated and the results were fitted with the pseudo-second-order model. The value of change in entropy (⊿S) obtained is -65.24 (J(mol K)). Negative values of change in enthalpy, ⊿H in (kJ mol) is -24.45 (kJ mol) which indicates both physical and chemical adsorptions involved in the process of adsorption. Finally, the nano FeO/chitosan-acrylamide hydrogel exhibited high performance to remove the Ni ions from water sample solution.

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Source
http://dx.doi.org/10.1007/s10661-023-12149-xDOI Listing

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