Removal of Cd (II) Ions from Water Solutions Using Dispersive Solid-Phase Extraction Method with 2-aminopyridine/graphene Oxide Nano-Plates

Abstract

Background: The effluent release containing heavy metals as Cd (II) ions has drastic risks to both the natural environment and human health. In this research, a novel nano sorbent from the pyridine derivative was prepared for dispersive solid-phase extraction of Cd (II) ions. Methods: Graphene oxide (GrO) was chemically modified by a 2-aminopyridine group (2Ap) through a multistep procedure. The affection of adsorbent amount, pH, temperature, equilibrium time on its sorption with Gr2Ap adsorbent was studied and Gr2Ap adsorbent displayed a high ability to adsorb Cd (II) at pH=6. Furthermore, to inquire about the adsorption isotherms of metal ions sorption mechanism, the model of Freundlich and Langmuir was fitted to empirical isotherm data. Besides, to inspect the basic process of the metal sorption mechanism pseudo-first and second-order kinetic, and Roginsky-Zeldovich types were compatible with adsorption kinetic results. Results: The concentration factor and limit of detection for Cd (II) were 12.5 and 1.84 µg/L, respectively. According to the value of the correlation coefficient factor, that the Gr2Ap adsorbent exhibits the highest ability to adsorb Cd (II) ions (22.54 mg/g) at pH=6. The pseudo-second-order pattern of Cd (II) adsorption fits best with the kinetic result. Conclusion: The Gr2Ap exhibited a high potential for removing the heavy metal ions from aqueous samples. Besides, the current research was shown an efficient, easy, inexpensive, and selectable method for evaluating the Cd (II) ions in several samples of water and wastewater.

Preparation of modified multiwalled carbon nanotubes (l-Arg-CS/MWCNTs-COOH/Fe3O4) as sorbent for dispersive solid phase extraction of Cu(II), Pb(II) and Cd(II) in wastewater samples

“…To evaluate the potential of the adsorbent on a large scale, reduce the overall cost and the possibility of recovering metals extracted from the aqueous solution; it is necessary to measure the ability of the adsorbent to desorb particles. 34 The result in Fig. 6 showed that the relative recovery was still good after six adsorption-desorption cycles.…”

“…Analytical figures of merit for the determination of metal ions The limit of detection (LOD) was calculated according to the following equation: (5) where SD is the standard deviation of 10 consecutive measurements of blank solutions and m is the slope of the calibration curves. 34 Also, the limit of quantification and Linearity were showed. Both RSDs of intraday and interday were calculated and were demonstrated good precision.…”

Green Adsorbents for Water Purification

“…Its very porous design provides a substantial surface area for adsorption. Through physical adsorption, in which metal ions are drawn to the surface of the biochar by electrostatic interactions or Van der Waals forces, biochar can absorb heavy metals [34]. Additionally, it can perform chemical reactions like ion exchange or complexation, in which metal ions connect to functional groups on the surface of the biochar.…”

Pb2+ recovery from real water samples by adsorption onto nano Fe3O4/chitosan‐acrylamide hydrogel ions in real water samples

“…The most recent adsorbents to be employed in recent years to remediate pollutants are hydrogels. They are simple to use and reuse and have outstanding mechanical qualities [4][5][6][7][8][9][10].…”