Bio-modified magnetic nanoparticles with Terminalia arjuna bark extract for the removal of methylene blue and lead (II) from simulated wastewater. (March 2022)

• Record Type: Journal Article
• Authors: Das, Chanchal; Singh, Sanjay; Bhakta, Snehasis; Mishra, Prashant; Biswas, Goutam
• Is Part Of: Chemosphere. Volume 291:Part 2(2022)
• Publication Date: 2022-03
• Subjects: Terminalia arjuna -- Magnetite nanoparticles -- Lead adsorption -- Methylene blue -- Simulated wastewater; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.132673
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: This study reports a greener, cheaper and convenient approach to synthesize Terminalia arjuna bark extract coated magnetite nanoparticles (TA@MNPs) using the co-precipitation method and efficient removal of methylene blue (MB) and lead ions [Pb(II)] from simulated wastewater. The synthesized nanoparticles (NPs) were characterized by various techniques such as DLS, XRD, FTIR, HRTEM, AGM, and TGA. From TGA analysis, TA@MNPs was found to be stable even after 500 °C. Using the batch method, maximum removal was achieved at pH 9.0 for MB and pH 3.0 for Pb(II) solutions, respectively. Adsorption study showed that TA@MNPs followed pseudo-second-order kinetics by both adsorbates while isotherm modeling towards adsorption of Pb(II) and MB exhibited Langmuir and Freundlich isotherm respectively. The maximum adsorption capacity for Pb(II) on TA@MNPs was 210.5 mg g −1 . The thermodynamic study proved the spontaneity of the physisorption process. Regeneration studies were also performed using five different eluents for the two adsorbents. Overall, TA@MNPs effectively removed pollutants from wastewater and thus could be potentially useful in providing clean water in a cheaper way. Graphical abstract: Image 1 Highlights: First report on Terminalia arjuna bark extract-coated magnetite nanoparticles (TA@MNPs), for wastewater treatment. TA@MNPs are reproducible and thermally stable adsorbent. Maximum adsorption efficiency from Langmuir model was 294.1 and 210.5 and mg g −1 for MB and lead [Pb(II)] with wastewater. The cost for large scale production of TA@MNPs is USD 19.48/kg.