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Single-Step Synthesis of Magnesium-Doped Lithium Manganese Oxide Nanosorbent and Their Polymer Composite Beads for Selective Heavy Metal Removal

Saravaia, Hitesh, Gupta, Hariom, Popat, Pooja, Sodha, Parthrajsinh, Kulshrestha, Vaibhav
ACS applied materials & interfaces 2018 v.10 no.50 pp. 44059-44070
adsorbents, adsorption, analytical methods, calcium, heavy metals, industrial wastes, kinetics, lithium, magnesium, manganese oxides, metal ions, potassium, sodium
Magnesium-doped lithium manganese oxide nanosorbent is prepared by a single-step solid-state method and characterized with appropriate analytical techniques, adsorption kinetic model, and isotherms. Competitive and noncompetitive adsorption studies are performed for a range of heavy metal ions. Prepared nanosorbent has shown explicit selectivity for various heavy metal ions and no remarkable influence of coexisting common interfering ions (Na⁺, K⁺, Mg²⁺, and Ca²⁺), which generally coexist with all natural sources of water, contaminated water, and industrial waste. To achieve easy handling of an adsorbent, polysulfone–nanosorbent (PS–nanosorbent) composite beads are prepared, and their competitive heavy metal removal performance is determined. Competitive adsorption and regeneration studies have shown that PS–nanosorbent beads can be employed for selective heavy metal removal and reuse for multiple cycles.