Analysis of the energy and nature of bandgap in layered double hydroxides Mg-Al-X and Zn-Al-X (X= Cl−, OH−, CO2− 3 , or NO− 3 ) - Santos, Márcio F.; Moraes, Pedro Ivo R.; Tavares, Sérgio R.; Martins, Adriano de Souza; Capaz, Rodrigo B.; Wypych, Fernando; Leitão, Alexandre A (Applied Clay Science, 2026)