Effect of Interlayer Anions on NiFe Layered Double Hydroxides for Catalytic Ozone Decomposition

作者：Zhisheng Wang, Xiaotong Li, Jinzhu Ma, Hong He · 发表于：Environmental Science & Technology · 年份：2024 · DOI：10.1021/acs.est.4c02276 · 被引用次数：50 · 研究领域：Layered Double Hydroxides Synthesis and Applications、Catalytic Processes in Materials Science、Advanced battery technologies research

NiFe layered double hydroxides (NiFe-LDH) exhibited an outstanding performance and promising application potential for removing ozone. However, the effect of interlayer anions on ozone removal remains ambiguous. Here, a series of NiFe-LDH with different interlayer anions (F –, Cl –, Br –, NO 3 –, CO 3 2–, and SO 4 2– ) were prepared to investigate the effect of the interlayer anion on ozone removal for the first time. It was found that the interlayer anions are a key factor affecting the water resistance of the NiFe-LDH catalyst under moist conditions. NiFe-LDH-CO 3 2– exhibited the best water resistance, which was much better than that of NiFe-LDH containing other interlayer anions. The in situ DIRFTS demonstrates that the carbonates in the interlayer of NiFe-LDH-CO 3 2– will undergo coordination changes through the interaction with water molecules under moist conditions, exposing new metal sites. As a result, the newly exposed metal sites could activate water molecules into hydroxyl groups that act as active sites for catalyzing ozone decomposition. This work provides a new insight into the interlayer anions of LDH, which is important for the design and development of LDH catalysts with excellent ozone removal properties.