Synergy of surface sodium and hydroxyl on NaTi2HO5 nanotubes accelerating the Pt-dominated ambient HCHO oxidation

Fang Liu; Shiying Zhang; Xiangchao Zhang; Jie Shen; Long Wan; Addie Bahi; Frank Ko

doi:10.1016/j.jhazmat.2021.126769

Synergy of surface sodium and hydroxyl on NaTi₂HO₅ nanotubes accelerating the Pt-dominated ambient HCHO oxidation

J Hazard Mater. 2022 Jan 5:421:126769. doi: 10.1016/j.jhazmat.2021.126769. Epub 2021 Jul 31.

Authors

Fang Liu¹, Shiying Zhang², Xiangchao Zhang³, Jie Shen³, Long Wan⁴, Addie Bahi⁵, Frank Ko⁵

Affiliations

¹ Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, PR China; School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China.
² Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, PR China. Electronic address: cszhangsy@ccsu.edu.cn.
³ Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, PR China.
⁴ College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China.
⁵ Department of Materials Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada.

PMID: 34388924
DOI: 10.1016/j.jhazmat.2021.126769

Abstract

Surface hydroxyl is widely perceived as conducive to HCHO degradation. Here, a kind of sodium titanate with interlayered hydroxyls (NaTi₂HO₅) was prepared to study the action conditions of surface hydroxyls in HCHO oxidation. The nanotubes mainly exposing (001) and nanobelts mainly exposing (100) are synthesized as the two morphologies of NaTi₂HO₅. We found the (001) facet is much more favored to HCHO adsorption via HRTEM and XPS analysis. The DFT calculations prove that the synergy of surface hydroxyl and Na atom is perfect for HCHO chemisorption. By this means NaTi₂HO₅ nanotubes can partially oxidize HCHO into formate and release very few CO, measured by in situ DRIFTS. Dominated by Pt nanoparticles, the complete oxidation of HCHO can be performed on NaTi₂HO₅ nanotubes with enhanced early reaction speed. Rather than simple surface hydroxyl, the effective synergy of hydroxyl and positive ion is proposed as an advantage for HCHO oxidation.

Keywords: Ambient condition; Formaldehyde oxidation; Sodium titanate; Surface hydroxyl.