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Bi 2 O 3 quantum dots decorated TiO 2 nanobelt heterojunctions were synthesised by a facile two-step hydrothermal process. The Bi 2 O 3 quantum dots highly dispersed on the surface of TiO 2 nanobelts resulted in more photosensitising sites and Bi 2 O 3-TiO 2 heterojunctions, leading to the enhanced absorbance for visible light. The strong Bi 2 O 3-TiO 2 interaction promoted the rapid transfer of photoelectrons from Bi 2 O 3 to TiO 2 and thus inhibited their recombination with holes. Meanwhile, the high-surface area facilitated the adsorption and diffusion of reactant molecules. As a result, this photocatalyst exhibited highly enhanced photoactivity in degradation of organic dyes under visible-light irradiation, which also displayed strong durability owing to the strong Bi 2 O 3-TiO 2 interaction against the leaching of Bi 2 O 3 quantum dots.