Duan Chaomin, Meng Mianwu, Huang Huang, Wang Heng, Ding Hua, Zhang Qi
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 Apr 5;25(14):10155-10165. doi: 10.1039/d3cp00557g.
As one of the significant pollutants in indoor air, formaldehyde (HCHO) has attracted increasing attention due to its negative effects on human health. Thus, to reduce formaldehyde pollution, herein, an Ag-promoted Cr/MnO catalyst (Ag/Cr/MnO) was obtained a hydrothermal-calcination method, which was employed for the catalytic oxidation of low-concentration indoor HCHO (∼1 ppm) at room temperature. The Ag/Cr/MnO catalyst eliminated approximately 98.62% HCHO within 14 h and maintained a high removal efficiency continuously under the dynamic test conditions. Furthermore, the catalyst exhibited good recycling stability and outstanding activity in a humid environment. Different characterization techniques were utilized to determine the physicochemical properties that contribute to improving the catalytic performance. The Ag substance contained metallic Ag (Ag) as the main component and some AgO, and the Ag particles provided ample active sites for the catalytic oxidation of HCHO. Besides, the incorporation of Ag increased the reducibility of the catalyst and the content of Mn, Cr and oxygen vacancies. The abundant active sites, high reducibility, rich Mn, Cr, oxygen vacancies, and surface lattice oxygen species, and the powerful interaction between Cr/MnO and Ag were the reasons for the splendid catalytic capability for HCHO by the Ag/Cr/MnO catalyst. In conclusion, the Ag/Cr/MnO catalyst can be a promising catalyst to degrade HCHO with practical application significance.
作为室内空气中的主要污染物之一，甲醛（HCHO）因其对人体健康的负面影响而受到越来越多的关注。因此，为了减少甲醛污染，本文采用水热煅烧法制备了一种Ag促进的Cr/MnO催化剂（Ag/Cr/MnO），用于室温下催化氧化低浓度室内甲醛（约1 ppm）。Ag/Cr/MnO催化剂在14小时内消除了约98.62%的甲醛，并且在动态测试条件下持续保持高去除效率。此外，该催化剂在潮湿环境中表现出良好的循环稳定性和出色的活性。利用不同的表征技术来确定有助于提高催化性能的物理化学性质。Ag物质以金属Ag（Ag）为主要成分，还含有一些AgO，Ag颗粒为甲醛的催化氧化提供了充足的活性位点。此外，Ag的掺入提高了催化剂的还原性以及Mn、Cr和氧空位的含量。丰富的活性位点、高还原性、富含Mn、Cr、氧空位和表面晶格氧物种，以及Cr/MnO与Ag之间的强相互作用，是Ag/Cr/MnO催化剂对甲醛具有出色催化能力的原因。总之，Ag/Cr/MnO催化剂有望成为一种具有实际应用意义的降解甲醛的催化剂。
