Duan Chaomin, Zhou Yanlin, Meng Mianwu, Huang Huang, Ding Hua, Zhang Qi, Huang Renyuan, Yan Mengjuan
College of Environment and Resources, Guangxi Normal University, Guilin, Guangxi 541004, China.
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin, Guangxi 541004, China.
Phys Chem Chem Phys. 2023 Sep 20;25(36):24495-24507. doi: 10.1039/d3cp01612a.
Formaldehyde (HCHO) is one of the major air pollutants, and its effective removal at room temperature has proven to be a great challenge. In this study, an Ag/Mn/CeO catalyst for the catalytic oxidation of low-concentration HCHO at room temperature was prepared by a hydrothermal-calcination method. The removal performance of the Ag/Mn/CeO catalyst for HCHO was systematically studied, and its surface chemical properties and microstructure were analyzed. The incorporation of Ag did not change the mesoporous structure of the Mn/CeO catalyst but reduced the pore size and specific surface area. The Ag species included metallic Ag as the main component and part of Ag. The well-dispersed Ag species on the catalyst provided sufficient active sites for the catalytic oxidation of HCHO. The more the Ag active sites, the more the lattice defects and oxygen vacancies generated from the interaction of Ag with Mn/CeO. Precisely because of this, the Ag/Mn/CeO catalyst exhibited high catalytic activity for HCHO at room temperature with a removal efficiency of 96.76% within 22 h, which is 22.91% higher than that of the Mn/CeO catalyst. Moreover, the Ag/Mn/CeO catalyst showed good cycling stability and the removal efficiency reached 85.77% after five cycles. Therefore, the as-prepared catalyst is an effective and sustainable material that can be used to remove HCHO from actual indoor polluted air. This paper provides ideas for the research and development of efficient catalysts.
甲醛（HCHO）是主要的空气污染物之一，在室温下有效去除甲醛已被证明是一项巨大挑战。本研究采用水热-煅烧法制备了用于室温下催化氧化低浓度HCHO的Ag/Mn/CeO催化剂。系统研究了Ag/Mn/CeO催化剂对HCHO的去除性能，并分析了其表面化学性质和微观结构。Ag的掺入并未改变Mn/CeO催化剂的介孔结构，但减小了孔径和比表面积。Ag物种包括以金属Ag为主要成分以及部分Ag。催化剂上分散良好的Ag物种为HCHO的催化氧化提供了充足的活性位点。Ag活性位点越多，Ag与Mn/CeO相互作用产生的晶格缺陷和氧空位就越多。正因为如此，Ag/Mn/CeO催化剂在室温下对HCHO表现出高催化活性，22 h内去除效率达96.76%，比Mn/CeO催化剂高22.91%。此外，Ag/Mn/CeO催化剂表现出良好的循环稳定性，五次循环后去除效率达到85.77%。因此，所制备的催化剂是一种有效且可持续的材料，可用于去除实际室内污染空气中的HCHO。本文为高效催化剂的研发提供了思路。
