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Tea-Waste-Mediated Magnetic Oxide Nanoparticles as a Potential Low-Cost Adsorbent for Phosphate (PO 4 3−) Anion Remediation.
- Source :
- Water (20734441); Oct2023, Vol. 15 Issue 20, p3541, 18p
- Publication Year :
- 2023
-
Abstract
- In the current study, magnetic oxide nanoparticle-impregnated tea waste (TW-Fe<subscript>3</subscript>O<subscript>4</subscript>) is employed as an adsorbent to remove phosphate ions (PO<subscript>4</subscript><superscript>3−</superscript>) from an aqueous solution. By utilizing a variety of analytical methods, the TW-Fe<subscript>3</subscript>O<subscript>4</subscript> nano-adsorbent was characterized by FE-SEM, TEM, EDX, BET, FTIR and XRD. The FE-SEM of TW-Fe<subscript>3</subscript>O<subscript>4</subscript> demonstrated the adsorbent's granular morphology with a variety of magnetic nanoparticle sizes and shapes. The XRD of TW-Fe<subscript>3</subscript>O<subscript>4</subscript> showed two diffraction peaks at 2θ values 30.9° and 35.4°, which are in correspondence with the diffraction pattern of magnetite. The synthesis of a TW-Fe<subscript>3</subscript>O<subscript>4</subscript> adsorbent with a greater surface area and porosity was demonstrated by BET analysis. Numerous adsorption factors like initial concentration of PO<subscript>4</subscript><superscript>3−</superscript> ion, pH of the medium, contact time, temperature and adsorbent dose were optimized for phosphate removal. The maximum removal of 92% was achieved by using the adsorbent dose of 1.2 g at 323 K (pH 5). Pseudo-second-order and intra-particle diffusion models were fitted to the sorption kinetic, whereas adsorption isotherm data were found well fitted to Freundlich and Dubinin–Radushkevich (D-R) models. The highest adsorption capacity of TW-Fe<subscript>3</subscript>O<subscript>4</subscript> towards phosphate ions was 226.8 mg/g, which is significantly higher than other reported bio-adsorbents. According to thermodynamic data, phosphate adsorption at the solid–liquid interface was of an endothermic and spontaneous nature and characterized by enhanced inevitability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734441
- Volume :
- 15
- Issue :
- 20
- Database :
- Complementary Index
- Journal :
- Water (20734441)
- Publication Type :
- Academic Journal
- Accession number :
- 173338579
- Full Text :
- https://doi.org/10.3390/w15203541