Abstract
Ozone is a pollutant that is very harmful to the ecological environment and human health, and layered double hydroxides (LDHs) have attracted much attention in recent years as an excellent anti-aqueous ozone catalyst. A kind of NiMn-LDHs with high defective sites was prepared by a one-step hydrothermal method to catalyze the degradation of ozone. The catalytic activity of NiMn-LDHs against ozone was further enhanced by increasing the concentration of oxygen vacancies on the surface while ensuring the intact structure of LDHs. When Ni/Mn=6:1, the catalyst had the best catalytic performance as well as stability, with 99.3 % degradation efficiency for 50 ppm ozone after 24 h of operation at WHSV=400000 mL·g−1·h−1 and RH=60 %. A series of data show that Ni6Mn-LDHs forms a crystal structure with lower crystallinity, larger specific surface area and smaller grain size. Compared with Ni2Mn-LDHs, the specific surface area of Ni6Mn-LDHs increased from 32.2 m2·g−1 to 171.4 m2·g−1, which is favourable to expose more surface defects. XPS and EPR confirmed that Ni6Mn-LDHs exhibited more surface oxygen vacancies, which plays a key role in the ozone decomposition process. The present study provides important guidance for the developed gaseous ozonolysis catalysts and promotes the practical ozone degradation performance of LDHs.
Published Version
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