Abstract

A hybrid structure of (NO_x)_i/S⁶⁺-TiO₂ (x=0,1) film with high visible-light activity was prepared via facile one-step anodizing in (NH₄)₂S₂O₈ electrolyte. The film was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and ultraviolet-visible-infrared absorption spectroscopy, respectively. Transient photocurrent response and linear sweep voltammetry were also detected. The results showed that the (NO_x)_i/S⁶⁺-TiO₂ film was composed of “flower-like” and porous structure. And N and S were successfully doped in the film. Meanwhile, the film also displayed broad and strong optical absorption at around 544 nm and 1500 nm. The photocurrent density reached 0.71 mA/cm². The decoloration rate was close to 100% and TOC removal reached 59.44% in 20 min under sunlight in photoelectrocatalytic (PEC) degradation methyl orange. The film also exhibited good stability after reuse ten times. A possible mechanism of PEC was suggested in methyl orange degradation by using (NO_x)_i/S⁶⁺-TiO₂ film.

Keywords: Anodizing; N/S co-doping; Narrow-gap; Photoelectrocatalytic; Mechanism

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Li, C.-X.; Liu, Y.; Zhang, Y.-Z.; Long, L.-L.; Shen, F.; Yang, G.; Zhang, X.-H.; He, Y.; Wang, L.-L.; Deng, S.-H. Beilstein Arch. 2019, 201929. doi:10.3762/bxiv.2019.29.v1

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