Eco-friendly in-situ synthesis of monolithic NiFe layered double hydroxide for catalytic decomposition of ozone

Herein, NiFe layered double hydroxide (NiFe-LDH) monolithic catalysts self-supported by metal foam were synthetized in-situ by a simple one-step hydrothermal method, and were first used for ozone elimination. NiFe-LDH/IF (Iron Foam, IF) monolithic catalysts were successfully prepared in the absence of ammonium fluoride (NH4F), avoiding the production of wastewater containing fluorine. The optimized NiFe-LDH/IF monolithic catalyst exhibited ozone conversion of 91.5% and 85% after 6 and 168 h, respectively, under harsh conditions, showing promising potential for ozone pollution control. This study provided a convenient and eco-friendly method for the preparation of monolithic catalyst.