Remarkable Removal of Pb(II) Ions from Aqueous Media Using Facilely Synthesized Sodium Manganese Silicate Hydroxide Hydrate/Manganese Silicate as a Novel Nanocomposite

The presence of Pb(II) ions in water causes many diseases, such as anemia, kidney disorders, and nervous system disorders. Therefore, this paper presents the facile hydrothermal synthesis of a novel type of nanocomposites, specifically sodium manganese silicate hydroxide hydrate/manganese silicate nanocomposite (Na4Mn5Si10O24(OH)6 center dot 6H2O/Mn2+Mn63+SiO12), which exhibits remarkable efficiency in the uptake of Pb(II) ions from aqueous solutions. The nanocomposites were chemically constructed using the hydrothermal technique in the absence and presence of polyethylene glycol 400 as an organic template to control the morphology, BET surface area, and mean crystallite size. The nanocomposites, which were chemically fabricated in the absence and presence of polyethylene glycol 400, are abbreviated as NF and NP, respectively. In addition, the XRD analysis exhibited that the calculated mean crystallite size of the NF and NP nanocomposites was found to be 18.28 and 60.26 nm, respectively. Due to the inverse relationship between crystallite size and BET surface area, the NF nanocomposite exhibits a higher BET surface area (71.52 m2/g) compared to the NP nanocomposite (46.26 m2/g). Hence, the greatest uptake capacity of the NF nanocomposite towards Pb(II) ions (292.39 mg/g) is greater than that of the NP nanocomposite (210.97 mg/g). Both NF and NP nanocomposites chemically and exothermically capture Pb(II) ions. Also, the adsorption processes obey the pseudo-second-order kinetic model and Langmuir equilibrium isotherm.