Anion intercalation double-metal hydroxide adsorbent, preparation method and application thereof

The invention provides an anion intercalation double-metal hydroxide adsorbent, a preparation method and application thereof, and belongs to the technical field of heavy metal adsorption materials. The preparation method disclosed by the invention comprises the following steps: carrying out hydrothermal reaction on a divalent metal magnesium salt, a trivalent metal aluminum salt and urea to obtain a precursor MgAl-CO3-LDH; adding nitric acid and sodium nitrate into the precursor to obtain a sample MgAl-NO3-LDH; and carrying out hydrothermal reaction on the MgAl-NO3-LDH and a sodium phytate salt hydrate to obtain the anion intercalation double-metal hydroxide adsorbent. Compared with other chelating agents, the MgAl-PA-LDH prepared by the method disclosed by the invention has a stronger chelating effect with metal ions and more adsorption sites, and has a very excellent treatment effect on sewage containing cadmium ions. The anion intercalation double-metal hydroxide adsorbent is prepared through an ion exchan