MnO2/AlOOH热催化材料制备及室温降解甲醛性能研究

Adsorption and photocatalysis techniques are always adopted to remove formaldehyde (HCHO) in the indoor environment. Thermal catalysis is a novel HCHO removal technique arising in recent years. Compared to adsorption, thermal catalysis has the special capability to decompose HCHO into CO2 and H2O. Compared to photocatalysis, thermal catalysis technique is simple and easy of handling which suffers little influence from environment variations. Therefore, thermal catalysis technique has broad application prospects in HCHO removal. –OH functional groups adsorbed on the surface of thermal catalysts are believed to play an important role in the decomposition of HCHO. This project plans to combine birnessite MnO2 with room temperature catalytic HCHO oxidation capability and AlOOH nanopieces adsorbing a large number of –OH functional groups on the surface by a room temperature preparation technique. This project aims to achieve cost-effective thermal catalysts with superior room temperature catalytic HCHO oxidation capability by a synergistic catalytic effect of MnO2 and AlOOH. In addition, the influence of –OH functional groups on the surface of AlOOH on the in situ growth dynamics and thermal catalytic performance of MnO2 will be investigated in detail. The synergistic catalytic mechanism of MnO2 and AlOOH will be demonstrated.

家居环境中去除甲醛主要采用吸附与光催化技术，热催化是近年来兴起的一种新型处理技术。与吸附相比，热催化能有效降解甲醛，而与光催化相比，热催化受环境影响小，简单易操作，因此具有广阔的应用前景。热催化材料表面-OH基团在降解甲醛中发挥了重要作用。本项目拟采用全室温制备工艺，将具有室温热催化能力的水钠锰矿型MnO2和表面含有丰富-OH基团的AlOOH纳米片复合，有望发挥MnO2和AlOOH的协同催化作用，获得成本低、室温降解甲醛性能优异的新型热催化材料。结合实验和理论计算，研究AlOOH表面-OH基团对MnO2原位生长动力学以及对其热催化能力的影响，阐明两种材料协同催化机理。

热催化是近年来兴起的一种新型家居环境中去除甲醛技术。热催化能有效降解甲醛，并且受环境影响小，操作简单易行，因此具有广阔的应用前景。通过本项目研究，获得了制备成本低廉、室温降解甲醛性能优良的MnO2/AlOOH复合热催化材料。和纯MnO2相比较，复合材料的催化性能得到大幅提升，其优良的热催化性能来源于MnO2和AlOOH两种材料之间的协同作用。MnO2/AlOOH材料未来有望实际应用于环保领域。本项目研究结果为过渡金属氧化物催化剂性能的提高提供了新思路。