Rapid removal of lead(II) ions from water using iron oxide–tea waste nanocomposite – a kinetic study

Abstract

Lead (Pb) ions are a major concern to the environment and human health as they are contemplated cumulative poisons. In this study, facile synthesis of magnetic iron oxide-tea waste nanocomposite is reported for adsorptive removal of lead ions from aqueous solutions and easy magnetic separation of the adsorbent afterwards. The samples were characterised by scanning electron microscopy, Fourier transform-infrared spectroscopy, X-ray diffraction, and Braunner-Emmet-Teller nitrogen adsorption study. Adsorptive removal of Pb(II) ions from aqueous solution was followed by ultraviolet-visible (UV-Vis) spectrophotometry. About 95% Pb(II) ion removal is achieved with the magnetic tea waste within 10 min. A coefficient of regression R 2 ≃ 0.99 and adsorption density of 18.83 mg g −1 was found when Pb(II) ions were removed from aqueous solution using magnetic tea waste. The removal of Pb(II) ions follows the pseudo-second-order rate kinetics. External mass transfer principally regulates the rate-limiting phenomena of adsorption of Pb(II) ions on iron oxide-tea waste surface. The results strongly imply that magnetic tea waste has promising potential as an economic and excellent adsorbent for the removal of Pb(II) from water.

Design and development of a portable resistive sensor based on α‐MnO 2 /GQD nanocomposites for trace quantification of Pb(II) in water

“…The first step (R1) involves the chemical adsorption and consequent complexation of metal ions (Pb 2+ in our case) by surface-adsorbed OH groups, as reported by Ren et al and Khanna et al [28,29]. These OH groups arise due to trace amounts of adsorbed moisture on the surface, as evidenced by the broad envelope at around 3200 cm −1 in the FTIR spectrum (Figure 2d).…”

“…and Khanna et al. [ 28 , 29 ]. These OH groups arise due to trace amounts of adsorbed moisture on the surface, as evidenced by the broad envelope at around 3200 cm −1 in the FTIR spectrum (Figure 2d ).…”

Efficient Removal of Pb(II) Ion Using Tio2/Zno/Sio2 Nanocomposite from Aqueous Solutions Via Adsorption-Photocatalysis Process

“…Numerous metal oxides are used to remove Pb(II) ions such as MgO nanorods (Ghoniem et al 2022), magnetic graphene oxide composites (Bao et al 2020), Fe 2 O 3 -tea waste (Khanna et al 2020), and CuO nanoparticles synthesized by a sputtering method (Verma et al 2017). This method is based on adsorption, usually straightforward and efficient, but its limitation lies in the incapacity to neutralize harmful ions; instead, it merely shifts the ions from the solution to the solid adsorbent.…”

Tea-Waste-Mediated Magnetic Oxide Nanoparticles as a Potential Low-Cost Adsorbent for Phosphate (PO43−) Anion Remediation

“…The application of Fe 3 O 4 nanoparticles as nano-adsorbents individually and in composite form has received great attention in the field of adsorption technology [16,33,34]. Recently, many reported studies have shown that the impregnation of magnetite (Fe 3 O 4 ) nanoparticles onto the surface of tea waste can enhance the surface area, porosity, mechanical stability, easy magnetic separation and adsorption properties of tea waste biosorbent [16,33,34]. In parallel, the reported studies indicate that impregnation of Fe 3 O 4 nanoparticles also improves the homogenous dispersibility and stability of Fe 3 O 4 nanopar-ticles onto the surface of tea waste [13].…”

“…Also, the recovery of TW-Fe 3 O 4 adsorbent is easy and fast with simple magnetic operation after adsorption from aqueous solutions [37]. Hence, magnetically modified tea waste adsorbents were potentially targeted towards the efficient removal of metallic cations, such as Ni (II), Pb (II), As (III), Hg (II) and U(VI), from water solutions, and excellent results were obtained [33,34,[37][38][39][40][41]. However, limited literature is reported for the removal of Chromate (CrO 4 2− ), Arsenate (AsO 4…”