| Streszczenie: | <p>Exploring a sustainable route for the efficient treating/recycling of heavy metal (like Ni<sup>2+</sup>, Cd<sup>2+</sup>, Cu<sup>2+</sup>) contamination of water is highly desirable both from the environment and resource view. Herein, we reported the scale-up synthesis of monolayer magnesium-aluminium layered double hydroxide (m-MgAl-LDH) nanosheets, which showed exceptional ability to mineralize Ni<sup>2+</sup>, Cd<sup>2+</sup> and Cu<sup>2+</sup> rapidly and efficiently. Furthermore, m-MgAl-LDH can purify 1 ppm Cu<sup>2+</sup>, Ni<sup>2+</sup> and Cd<sup>2+</sup> to safe levels. The sorption sites of heavy metal ions were revealed. Ni<sup>2+</sup> and Cd<sup>2+</sup> substitute for the Mg<sup>2+</sup> sites within the MgAl-LDH layers, while Cu<sup>2+</sup> ions anchor on the surface of MgAl-LDH with high dispersion. The mineralized products from Ni<sup>2+</sup> and Cu<sup>2+</sup> cations further showed excellent performance in visible-light-induced photocatalytic reduction of CO<sub>2</sub> and removal of anions (like PO<sub>4</sub><sup>3-</sup> and toxic AsO<sub>2</sub><sup>-</sup> ions) efficiently, providing an alternative for the mitigation of energy and resource crisis.</p>
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