To further extend the light response range of BiPO₄ and meanwhile keep its strong photocatalytic oxidation ability, the design of a type-II heterojunction by coupling BiPO₄ with a narrower band gap semiconductor of Bi₂SiO₅ as a novel and efficient photocatalytic catalyst has been successfully realized through a simple co-precipitate method. Moreover, under 365 nm UV light irradiation, pure BiPO₄ shows no photo-activity, whereas the optimal Bi₂SiO₅/BiPO₄ heterostructure exhibits highly enhanced photocatalytic activity than pure Bi₂SiO₅ in systems of photo-degradation over phenol and MB, which is 4.36 times and 1.13 times the values of pure Bi₂SiO₅. Experimental results reveal that the superior photocatalytic performance can be attributed to the synergetic effect of the evidently improved charge separation ability via the heterojunction, good crystallinity, expanded light absorbance and the moderate BET specific surface area.

为了进一步扩展BiPO ₄的光响应范围并同时保持其强大的光催化氧化能力，通过将BiPO ₄与较窄的带隙半导体Bi ₂ SiO ₅偶联作为一种新型高效的光催化催化剂，设计了II型异质结。通过简单的共沉淀方法成功实现了。此外，在365 nm紫外线照射下，纯BiPO ₄没有光活性，而最佳的Bi ₂ SiO ₅ / BiPO ₄异质结构比纯Bi ₂ SiO ₅表现出更高的光催化活性。在苯酚和MB上的光降解体系中，其纯度是纯Bi ₂ SiO _5的4.36倍和1.13倍。实验结果表明，优异的光催化性能可归因于通过异质结，良好的结晶度，扩展的光吸收率和适度的BET比表面积显着提高的电荷分离能力的协同效应。