Photocatalytic Degradation of Gaseous CH2O over ZnO Nanoparticles

doi:10.7517/j.issn.1674-0475.2018.02.006

Abstract

Abstract: Nanosized ZnO particles have been synthesized by sol-gel method and studied for photocatalytic activities toward gaseous CH₂O degradation. It was found that CH₂O adsorbed on ZnO nanoparticles can be oxidized to CO₂ under UV light irradiation with the coexistence of either O₂ or H₂O. However, different from aqueous condition where H₂O molecules are first oxidized to be free radicals then react with CH₂O, direct photoactivation of O₂ becomes the dominant step in promoting photocatalytic degradation efficiency of gaseous CH₂O. The results reveal a new reaction mechanism that can be important for further modification of photocatalyst for gaseous CH₂O degradation.

Key words: ZnO, photocatalytic degradation of CH₂O, photoactivation of O₂

LI Ling, DU Yunshu, WANG Xuan, HAN Jian, WANG Chuanyi. Photocatalytic Degradation of Gaseous CH₂O over ZnO Nanoparticles[J]. Imaging Science and Photochemistry, 2018, 36(2): 171-177.

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Photocatalytic Degradation of Gaseous CH₂O over ZnO Nanoparticles

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