Efficiently photothermal conversion in a MnOx-based monolithic photothermocatalyst for gaseous formaldehyde elimination

• Published in: Chinese chemical letters Vol. 33; no. 5; pp. 2564 - 2568
• Main Authors: Sun, Pengfei, Yu, Huijia, Liu, Tingting, Li, Yingshuang, Wang, Zhongsen, Xiao, Yufei, Dong, Xiaoping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2022; Department of Chemistry,Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province,Zhejiang Sci-Tech University,Hangzhou 310018,China
• Subjects: Formaldehyde; Graphene oxide; Melamine sponge; MnOx; Photothermal catalytic; Graphene oxide; Melamine sponge; Photothermal catalytic; MnOx; Formaldehyde
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2021.09.050

Volatile organic compound (VOC) pollution has a serious impact on human and urgently needs to be controlled through the development of new methods and catalytic materials. Compared with traditional thermal catalytic oxidation, the synergistic photothermocatalysis is regarded as a green and environmentally friendly strategy for organic compound pollutant removal, which can promote spontaneous heating of the surface of catalysts to achieve thermal catalytic reaction conditions via harvesting light irradiation. In this paper, a monolithic photothermocatalyst was synthesized through coating graphene oxide (GO) and MnOx in turn on a commercially available melamine sponge, where the GO mainly acted as a photothermal conversion layer to heat the catalytically active MnOx. This monolithic catalyst presented excellent photo-induced activity for formaldehyde elimination under ambient conditions (∼ 90% degradation ratio in 20 min for ∼160 ppm initial concentration formaldehyde), and meanwhile possessed a high catalytic durability for multiple cycles. The kinetic study demonstrated that this photothermocatalytic process followed a pseudo-second-order kinetics. Finally, we proposed a possible formaldehyde degradation pathway based on in situ DRIFTS examination.
A sponge monolithic catalyst modified by graphene and manganese oxide, which exhibited good performance of formaldehyde removal under visible light due to a surface photothermal effect.
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