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An ordered g-C 3 N 4 - and polyaniline-modified titanium oxide nanotube array (g-C 3 N 4 - and PANI-co-modified TiO 2 NTAs) was successfully synthesized and used as a photocatalyst. Polyaniline (PANI) was coated onto TiO 2 NTAs by electrochemical polycondensation, and g-C 3 N 4 was deposited via the soaking adsorption method. The photocatalysts were examined by several technologies. The experiments demonstrated that the amount of g-C 3 N 4 and PANI, as well as the initial pH value, had significant effects on the photocatalytic efficiency. The resulting photocatalysts exhibited high visible light photocatalytic ability for tetrabromobisphenol A (TBBPA) for two reasons. First, PANI expanded the light absorption into the visible region. Second, rapid and efficient separation of photoinduced charges from the photogenerated potential difference were produced at the contact interface of g-C 3 N 4 and PANI-co-modified TiO 2 NTAs. The •OH, [Formula: see text] and h + were dominant components for the photocatalytic degradation of TBBPA. In addition, the g-C 3 N 4 and PANI-co-modified TiO 2 NTAs have excellent long-term stability., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier Ltd. All rights reserved.)