Efficient treatment of wastewater is one of the major concerns for countries all over the world. Highly effective, rapid, and concurrent removal of heavy metals down to trace levels (e.g., &lt; 5 ppb) remains challenging. Here, we introduce the new 2D hybrid thiostannate intercalated later double hydroxide, LDH-[Sn2S6] as an unprecedented sorbent that shows highly efficient and concurrent removal of Cu, Ag, Cd, Pb, and Hg cations from ppm to ppb level in seconds, satisfying the World Health Organization limit for drinking water. In mixed-ion states of Zn, Co, Ni, Ag, Cu, Hg, Pb, and Cd cations (10 ppm each, 80 ppm in total) in deionized water, it shows simultaneous removal of over 99.9 percent of Cu, Ag, Cd, Pd, and Hg ions. This leads to the final concentrations of each ion below 5 ppb. Remarkably, similar removal efficiencies were obtained for potable and river water. Moreover, this hybrid material removes over 99.0 % of Cu, Ag, Cd, Pb, and Hg at pH ~ 2 to 9 preserving high distribution constant (Kd) ~ 105 to 107 mL/g. Moreover, LDH-[Sn2S6] shows enormous sorption capacities (qm) of 378, 978, 332, 579, and 666 mg/g for Cu, Ag, Cd, Pb, and Hg ions, respectively. Altogether, LDH-Sn2S6 is revealed as a unique adsorbent that combines ultra-high removal, extraordinary selectivity, extremely rapid adsorption kinetics, a wide range of pH stability, and enormous adsorption capacity. The combinations of such extraordinary features place LDH-Sn2S6 at the top of all materials known to date for the decontaminations of wastewater.

Thiostannate intercalated layer double hydroxides as highly efficient adsorbents for toxic heavy metal ions

ACS Fall 2021

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