通过共沉淀法制备Bi₂O₂CO₃纳米片，采用化学蚀刻法制备异质结型光催化剂Bi₂O₂CO₃/BiOBr。利用XRD、TEM和UV-Vis DRS等手段对其物相、形貌及光吸收性能进行表征，并对其可见光降解盐酸四环素溶液的性能和稳定性进行了评估。结果表明，与纯Bi₂O₂CO₃和BiOBr相比，异质结光催化剂Bi₂O₂CO₃/BiOBr展现了增强的可见光降解活性，这归因于Bi₂O₂CO₃与BiOBr之间异质结的形成有效分离了光生电子和空穴。Bi₂O₂CO₃/BiOBr具有较高的稳定性，其在可见光降解盐酸四环素过程中的主要活性物种是超氧自由基。

Bi₂O₂CO₃ nanosheets are synthesized by coprecipitation method.Bi₂O₂CO₃/BiOBr heterojunctions are then synthesized by using a chemical etching method.The phase,morphology and optical absorption performance of the heterojunctions are characterized by XRD,TEM and UV-Vis DRS,respectively,and its photocatalytic activity is evaluated through degrading tetracycline hydrochloride under visible light irradiation.It is found that the as-prepared Bi₂O₂CO₃/BiOBr heterojunctions exhibit an enhanced photocatalytic activity than pure Bi₂O₂CO₃ or BiOBr,which may be attributed to the efficient separation of electron-hole pairs caused by the formation of heterojunction between Bi₂O₂CO₃ and BiOBr.Bi₂O₂CO₃/BiOBr heterojunctions show high stability.Superoxide radicals are main active species in the degradation process of tetracycline hydrochloride under visible light irradiation.