Highly Efficient MnO2/AlOOH Composite Catalyst for Indoor Low-Concentration Formaldehyde Removal at Room Temperature

Zhiyuan Liu; Jingpeng Niu; Weimin Long; Bing Cui; Kun Song; Fan Dong; Dong Xu

doi:10.1021/acs.inorgchem.0c00852

Highly Efficient MnO₂/AlOOH Composite Catalyst for Indoor Low-Concentration Formaldehyde Removal at Room Temperature

Inorg Chem. 2020 May 18;59(10):7335-7343. doi: 10.1021/acs.inorgchem.0c00852. Epub 2020 May 1.

Authors

Zhiyuan Liu^{1

2}, Jingpeng Niu^{1

2}, Weimin Long³, Bing Cui^{1

2}, Kun Song^{1

2}, Fan Dong⁴, Dong Xu^{1

2}

Affiliations

¹ Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Anhui University of Technology, Ministry of Education, Ma'anshan 243002, China.
² Key Laboratory of Metallurgical Emission Reduction and Resources Recycling, Anhui University of Technology, Ministry of Education, 243002 Ma'anshan, China.
³ Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China.
⁴ Research Center for Environmental Science and Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.

PMID: 32356983
DOI: 10.1021/acs.inorgchem.0c00852

Abstract

Indoor formaldehyde from substandard furniture and decorative materials seriously endangers human health. How to remove effectively indoor formaldehyde with low concentration at room temperature is a challenging problem. Using a MnO₂/AlOOH composite by the MnO₂ modification as a catalyst provides an effective approach to solve this challenge. Here, a new type of MnO₂/AlOOH composite catalyst with high ability to remove indoor low-concentration formaldehyde was prepared by redox reaction at room temperature. A MnO₂/AlOOH composite with a homogeneous dispersion of MnO₂ has high specific surface area and a large amount of surface hydroxyl (-OH) which plays a major role in the adsorption of formaldehyde. A partially crystalline structure was observed in the composite, which contains multivalent Mn ions and a large number of vacancy defects. The surface -OH of composite shows strong oxidation activity through the charge exchange of multivalent Mn ions and vacancy defects. The composite has a higher ability to remove indoor low-concentration formaldehyde compared to the birnessite MnO₂ at room temperature. This study proposes a new idea for the improvement of catalytic performance in the structure and composition of the catalyst.