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Nanosheets consisting of two-dimensional (2-D) nanomaterials made up of Ca 2+ (Ca), and Y 3+ (Y) cations and carbonate [CO 3  2- ] anions in the interlayer with a uniform thickness and lengths of around 10 μm have been successfully synthesized in a hydrotalcite layer structure, otherwise known as a layered double hydroxide, using a facile hydrothermal method. The resulting CaY-CO 3  2- layered double-hydroxide (LDH) materials demonstrate outstanding affinity and selectivity for toxic transition metal ions such as Cr 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Pb 2+ , Cd 2+ , and Hg 2+ as well as metalloid As 3+ . The adsorption of all of the highly toxic metal ions from the aqueous solution was found to be exceptionally rapid and highly selective, with more than 95% removal achieved within 30 min. For AsO 3 , a strong adsorption potential of 452 mg/g was observed at pH 7.0, which is better than most values previously reported. The distribution coefficient K  d values can exceed ∼10 6 mL/g for Cr 3+ , Pb 2+ , and As 3+ , which are highly toxic. The fabricated materials have excellent chemical stability: they retain their well-defined lamellar shapes even under mildly acidic conditions.

Efficient Capture of Heavy Metal Ions and Arsenic with a CaY–Carbonate Layered Double-Hydroxide Nanosheet