“…In general, LDHs are considered inorganic layered materials consisting of stacks of positively charged double hydroxide layers of divalent (e.g., Mg 2+ , Zn 2+ , or Ca 2+ ) and trivalent (e.g., Al 3+ , Fe 3+ , or Cr 3+ ) metal ions, with hydrated anions among the layers to compensate for the charge (Scheme ). Because of their unique anisotropic structure, they are one of the few layered materials with a positive structural charge that enables the adsorption of negatively charged substances, such as biomolecules in delivery processes. − Besides, LDHs are also used as basic building blocks for functional materials used as catalysts , and electrodes …”