Layered double hydroxides-based materials as novel catalysts for gaseous VOCs abatement: Recent advances and mechanisms

Volatile organic compounds (VOCs) have received increasing attention for their severe hazards to the ecological environment and human health. Accordingly, various VOCs abatement technologies have been developed, where the selection of efficient catalysts is particularly critical. In recent years, the research of layered double hydroxides (LDHs)-based materials as novel catalysts has become one of the most attractive topics. With the tunability of LDHs in chemical composition, electronic structure and morphology, as well as their unique structural features and superior physicochemical properties, LDHs-based catalysts show enormous potential for environmental applications. This paper reviews the recent advances of LDHs-based materials for gaseous VOCs abatement, mainly covers two fields: photocatalytic oxidation and thermal catalytic oxidation. Especially, we summarize and compare the catalytic performance and intensified mechanisms of various LDHs-based materials, where the mechanistic details that lead to their varying results in terms of catalytic activity and reaction routes are the main focus of the discussion. Moreover, the effect of different gas components (e.g., SO2, H2O, CO, NOx) on the performance of LDHs-based materials is examined. Our group also overviews the application of LDHs-based materials for VOCs adsorption, sensing and steam reforming. Finally, we provide an outlook on the current challenges and development strategies from the perspective of practical applications.