Electrodeposition Synthesis of MgAl-LDHs for Utilization of Salt Lake Bischofite
摘要
This study introduces a novel membrane electrolysis technique for the production of magnesium aluminum layered double hydroxides (MgAl-LDHs) utilizing magnesium chloride sourced from salt lakes. The research investigates the impact of varying the Mg/Al ratio, current density, and sodium chloride concentration on electrolysis parameters and unit energy consumption. Throughout the electrolysis process, the cell voltage increased with the Mg/Al ratio and current density but decreased with increasing sodium chloride concentration. Moreover, the pH level in the cathode chamber showed a positive correlation with the Mg/Al ratio, current density, and sodium chloride concentration. Optimal electrolysis efficiency was achieved with a Mg/Al ratio of 3, a current density of 80 mA cm−2, and a sodium chloride concentration of 6 g L−1, resulting in the lowest unit energy consumption of 3.77 kW h kg−1. This innovative electrolysis approach has been successfully implemented for the large-scale synthesis of MgAl-LDHs from brine magnesium sources, offering a promising technological avenue for the sustainable and cost-effective utilization of salt lake magnesium resources.