The design and construction of functional nanomaterials with excellent properties is very important for photocatalytic applications. The ZnO@SnO₂ heterojunction domed nanotubes (HDNs) were successfully prepared without additional acid etching step using one-dimensional ZnO nanorods as templates by two-step solvothermal technology based on the template self-etching mechanism. The built-in electric field which can promote carrier separation can be formed at the nanotube interface owing to the matching energy level structure between ZnO and SnO₂, endowing the material excellent photocatalytic and stability properties. By controlling the intensity of self-generated alkaline during the experimental processes, the amphoteric oxide ZnO can be etched, achieving the controllable regulation of the thickness of tubes and their photocatalytic performance. The morphology, element composition, growth mechanism and properties of the ZnO@SnO₂ HDNs were investigated by means of SEM, TEM, STEM and PL. Taking methyl orange, methylene blue and eosin as pollutant models, the experimental results of photocatalytic pollutant degradation showed that ZnO@SnO₂ HDNs had excellent photocatalytic performance, and

the degradation rate of methylene blue and eosin can reach 95% within 60 min. These results indicate that the constructed one-dimensional heterojunction can greatly promote the separation of carriers and inhibit their recombination, thereby improving the photocatalytic performance. At the same time, the cycle stability test showes that the heterojunction nanotube photocatalyst has great stability and broad application prospects in dye degradation.