Photocatalytic reduction of CO2 using molybdenum-doped titanate nanotubes in a MEA solution

Hung Yu Wu, Nhat Huy Nguyen, Hsun-Ling Bai*, Su-Min Chang, Jeffrey C.S. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

In this study, the photocatalytic reduction of CO2 in a monoethanolamine solution to form valuable energy sources was investigated using Mo-doped TNTs photocatalysts for the first time. The results revealed that the structure of Mo-doped TNTs changed with the increase of calcination temperature. For Mo-doped TNTs calcined at 500 °C, the partial corruption of titanate nanotubes into anatase particles caused the reduction of Mo species from Mo6+ to Mo5+ and produced oxygen vacancies, which resulted in the highest CO2 reduction ability. The yield rates of CH4, CO and total combustible organic compounds were 0.52, 10.41 and 13.53 μmol gcat-1, respectively, under UVA (8 W, 63 μW cm-2) irradiation. The photoreduction quantum efficiencies of CH4 and CO were achieved at 0.036% and 0.180%, respectively. It was found that the molybdenum structure and oxygen vacancies could be the key factors controlling the photocatalytic reduction efficiency of CO2. A possible structure transformation of Mo-doped TNTs at different calcination temperatures was inferred and the reaction mechanism for photocatalytic CO2 reduction with oxygen vacancy sites of Mo-doped TNTs was proposed.

Original languageEnglish
Pages (from-to)63142-63151
Number of pages10
JournalRSC Advances
Volume5
Issue number78
DOIs
StatePublished - 1 Jan 2015

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