A series of ternary composite photocatalysts of Bi₂O₃/Bi embedded in porous carbon (Bi₂O₃/Bi/PC) was prepared by the high-temperature pyrolysis of a bismuth-based metal organic framework (CAU-17(Bi)). They were used as photocatalysts for the degradation of organic Rhodamine B dye (RhB) in water under visible light. Results showed that the Bi₂O₃/Bi/PC composites with different Bi₂O₃/Bi ratios could be obtained through changing the extent of the carbothermal reduction of Bi₂O₃ during pyrolysis. The photocatalystpyrolyzed at 800 ^oC showed the highest photocatalytic performance and had a wide applicable pH value range and excellent recyclability and stability.The components in the ternary composites exhibited a synergetic effect in the removal of RhB, where Bi₂O₃ acted as a low-band gap semiconductor, metallic Bi transferred electrons generated by visible light excitation to the graphitic structure in porous carbon to inhibit the recombination of electrons with holes. The holes and peroxide radicals were the main active species. This study provides a new way for the design and preparation of visible-light active and high-performance photocatalysts for organic contaminant degradation in aqueous media by using metal organic frameworks as a multicomponent precursor.

一系列的Bi三元复合光催化剂的₂ ö ₃嵌入在多孔碳/铋的（Bi ₂ ö ₃ /铋/ PC）通过基于铋的金属有机骨架的高温热解制备（CAU-17（Bi）的）。它们被用作光催化剂，用于在可见光下降解水中的有机若丹明B染料（RhB）。结果表明，通过改变热解过程中Bi ₂ O ₃的碳热还原程度，可以得到具有不同Bi ₂ O ₃ / Bi比的Bi ₂ O ₃ / Bi / PC复合材料。光催化剂在800 ^{o处被热解}C表现出最高的光催化性能，适用的pH值范围宽，可回收性和稳定性极佳。三元复合材料中的组分在去除RhB方面具有协同作用，其中Bi ₂ O ₃用作低带隙半导体，金属Bi将可见光激发产生的电子转移到多孔碳中的石墨结构，以抑制电子与空穴的复合。空穴和过氧化物自由基是主要的活性物种。这项研究为使用金属有机骨架作为多组分前体，设计和制备可见光活性和高性能光催化剂，用于水介质中的有机污染物降解提供了新途径。