Photoelectrochemical determination of intrinsic kinetics of photoelectrocatalysis processes at {001} faceted anatase TiO2 photoanodes | Zendy

Tao Sun | Zendy; Yun Wang | Zendy; Mohammad AlMamun | Zendy; Haimin Zhang | Zendy; Porun Liu | Zendy; Huijun Zhao | Zendy

Open Access

Photoelectrochemical determination of intrinsic kinetics of photoelectrocatalysis processes at {001} faceted anatase TiO₂ photoanodes

Author(s) -

Tao Sun,

Yun Wang,

Mohammad AlMamun,

Haimin Zhang,

Porun Liu,

Huijun Zhao

Publication year - 2015

Publication title -

rsc advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.746

H-Index - 148

ISSN - 2046-2069

DOI - 10.1039/c4ra15336g

Subject(s) - anatase , kinetics , materials science , chemical engineering , photoelectrochemistry , nanotechnology , photocatalysis , chemistry , catalysis , electrochemistry , physics , electrode , biochemistry , quantum mechanics , engineering

The understanding of the intrinsic degradation kinetics of organic species at the reactive anatase TiO2 (001) surfaces under operational conditions is essential for the development of photoelectrocatalytic treatment of wastewater or polluted air. In this study, the intrinsic degradation kinetics of oxalic acid on the anatase (001) surface is successfully investigated by using a facile photoelectrochemical (PEC) method. A double-layered TiO2 photoanode with mainly anatase {001} facets exposed is purposely designed for the PEC measurements. The results reveal that the adsorption of oxalic acid follows the Langmuir adsorption model within the investigated concentration range. The PEC degradation profile can be fitted by two different first-order kinetic processes. The measured rate constant for the fast degradation processes is five times higher than that of the slow processes. The results confirm that the anatase TiO2 with exposed {001} facets possesses a higher reactivity than that of {101} faceted anatase TiO2.Griffith Sciences, Griffith School of EnvironmentNo Full Tex

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