金属有机框架 (metal-organic framework, MOF) 材料 ZIF-67 衍生 Co₃O₄ 十二面体纳米块在室温下与 SnO₂ 复合, 制备出立方体 Co₃O₄/SnO₂ 复合光催化剂. 煅烧后形成的Co₃O₄/SnO₂ 材料禁带宽度明显降低, 荧光淬灭明显, 说明 Co₃O₄ 的加入拓展了 SnO₂ 的光响应范围至可见光甚至红外光区域, 同时促进了光催化反应过程中光生载流子的分离. 以罗丹明 B(Rhodamine B, RhB) 为目标反应物, 在可见光下考察了 MOF 衍生的 Co₃O₄/SnO₂ 的光催化降解活性, 发现 Co₃O₄/SnO₂ 在 60 min 内可以降解 89.6% 的 RhB, 分别是纯 SnO₂和纯 ZIF-67 的 4.5 倍和 3 倍. 同时,  Co₃O₄/SnO₂表现出了良好的光反应能力和稳定性. 基于以上实验结果并结合自由基淬灭实验, 提出了 MOF 衍生的  Co₃O₄/SnO₂ 复合材料光催化降解有机染料 RhB 的机理.

A cubic  Co₃O₄/SnO₂ composite photocatalyst was prepared by combining do-decahedral nano-blocks derived from metal-organic framework (MOF) material ZIF-67 with SnO₂ at room temperature. Results showed that the band gap of the calcined  Co₃O₄/SnO₂ material was significantly reduced, and the phenomenon of fluorescence quenching was obvious. The addition of Co3O4 expanded the photoresponse range of SnO₂ to visible light or even infrared light and simultaneously promoted the separation of photo-generated carriers during the photocatalytic reaction. With Rhodamine B (RhB) used as the target reactant, the photocatalytic degradation activity of  Co₃O₄/SnO₂ derived from the MOF was investigated under visible light. It was found that  Co₃O₄/SnO₂ could degrade 89.6%RhB within 60 min, which was 4.5 and 3 times greater than those of pure SnO2 and pure ZIF-67, respectively. In addition, Co3O4/SnO2 showed good photoreactivity and stability. Based on these experimental results and those from free-radical quenching experiments, the mechanism of photocatalytic degradation of organic dyes RhB by the MOF-derived Co3O4/SnO2 composite material was proposed.