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Rapid detection of toxic metal ions is of paramount importance in environmental studies for efficient environmental remediation. The use of effective nanomaterials that facilitate fast detection and cost-effective analysis is one of the active areas of research nowadays. Plant-based magnetic nanoparticles (MNPs) were prepared via a reverse chemical co-precipitation method using guava leaves extract as a reducing agent. The prepared MNPs were utilized as an adsorbent for the remediation of Ni 2 + ions in aqueous solution. Batch adsorption experiment was conducted to evaluate the amount of Ni 2 + ions being adsorbed in the surface of the MNPs. Results revealed that 98% of the Ni 2 + ions were adsorbed in the surface of the MNPs when 5.0 mg of the MNP adsorbent was utilized. Likewise, it was observed that the maximum adsorption was achieved even at 10 minutes incubation time using 1.597 ppm initial Ni 2 + concentration and the use of 5.0 mg of MNP. The adsorption behavior and mechanism of MNPs as the adsorbent is probably dominated by electron-electron interaction, and the data can be correlated with the functional group analysis using Fourier-Transform Infrared Spectroscopy (FT-IR). It was also observed that higher adsorption capacity (~8.5 mg/g) was attained when 5.0 mg of MNP was used. Importantly, the equilibrium data perfectly fit in the Langmuir isotherm with a slight deviation in the Freundlich isotherm.

Remediation of Ni2+ in a nickel-contaminated water sample using magnetic nanoprobes prepared via green process by Psidium guajava leaves extract