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This work presents the synthesis, characterization, and application of titanium dioxide nanotube arrays (T-NT) prepared on titanium coils by anodization. A comparison of the physical, photoelectrochemical, and photocatalytic properties of T-NT on coil, mesh, and foil architectures is reported. The application of T-NT on helical coils to UV–vis initiated photodegradation of pollutants in aqueous and gaseous phases is discussed. The T-NT on coil shows better photoactivity compared to T-NT on other geometries such as foil and mesh. A 30% increase in the photodegradation of methyl orange in the aqueous phase is noted with T-NT on coils compared to T-NT on mesh. T-NT on coils also demonstrate photodegradation of a model pollutant 2,3-butanedione (diacetyl) in the gaseous phase. The T-NT grown on the coil architecture offer several advantages such as significantly minimized dark spots, highly reduced …