Journal
MATERIALS TODAY COMMUNICATIONS
Volume 32, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2022.103835
Keywords
MXene(Ti3C2-OH); One-step synthesis; TiO2; TiO2-Ti3C2-OHhybrid; Photocatalysis; NO(x)oxidation
Categories
Funding
- National Science Foundation under the NSF CAREER program [1653527]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1653527] Funding Source: National Science Foundation
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In this study, delaminated and OH-terminated MXene was synthesized through a one-step hydrothermal process. The co-catalytic effect of this MXene combined with TiO2 was found to be highly effective in photocatalytic oxidation of NOx. The OH-terminated MXene outperformed the F-terminated MXene in terms of NO2 storage selectivity and DeNOx index.
Difficulties associated with MXene fabrication typified by an environmentally hazardous fluorine-based etching process followed by delamination and fluorine reduction steps create obstacles against the expansion of this outstanding material and its application in air purification. Herein, we demonstrate a one-step hydrothermal process that involves alkali (NaOH)-assisted aluminum etching in the presence of a delaminating agent (hy-drazine) for synthesis of delaminated, OH-terminated MXene (Ti3C2-OH). The process does not require the use of fluorine-containing compounds and produces Ti3C2-OH sheets without the need for post-synthesis treatment. Ti3C2-OH shows a strong synergistic effect as a co-catalyst when coupled with TiO2 during photocatalytic oxidation of NOx. Excellent NOx storage selectivity (91 %) and a positive DeNOx index (+ 0.30) were achieved at NO conversion of 54 %. The photocatalytic activity of the hybrid shows high sensitivity to the surface chemistry of the co-catalyst as Ti3C2-OH outperforms delaminated, F-terminated Ti3C2 (fabricated via the traditional process), which shows low NO2 storage selectivity (65 %) and a negative DeNOx index (-0.05) at NO conversion of 47 %. We envision that these findings will benefit ongoing efforts aimed at developing effective alternative methods for MXene synthesis and provide a pathway for rational design of efficient NOx abatement photocatalysts.
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