摘要：

采用醋酸钴、醋酸锌和苯并咪唑为原料，在常温下一步合成一种双金属节点的沸石咪唑骨架材料（ZIFs），用于活化过一硫酸盐（PMS）降解罗丹明B（RhB）。通过SEM、XRD和FTIR对材料进行表征。结果表明，所制备的材料颗粒形貌规则并具有典型金属有机骨架材料特征。考察Zn/Co物质的量比、溶液初始pH、催化剂投加量、PMS浓度对反应的影响，其中Zn/Co物质的量比为3∶1所制备的Zn_0.75Co_0.25-ZIF活化效能最佳，受pH影响小，RhB、PMS初始质量浓度分别为50、250 mg/L，Zn_0.75Co_0.25-ZIF投加量为0.05 g/L时，RhB在初始pH为3~10的溶液中反应30 min后，降解率均高于99%；催化剂具有良好的稳定性，在第5次循环使用中，RhB的降解率依然高于95%。

关键词: 沸石咪唑骨架材料, 罗丹明B, 过一硫酸盐, 催化降解

Abstract:

Cobaltous acetate，zinc acetate，benzimidazole were applied as the raw materials to prepare a bimetallic nodes zeolite imidazole frameworks（ZIFs） to activate peroxymonosulfate（PMS） for Rhodamine B（RhB） degradation. The prepared materials were characterized by SEM，XRD and FTIR. The results showed that the prepared materials possess the characteristics of typical metal organic frameworks materials with regular morphology. Influencing factors including Zn/Co molar ratio，initial solution pH，catalyst dosage and PMS concentration were investigated. Zn_0.75Co_0.25-ZIF with Zn/Co molar ratio of 3∶1 had the best activation efficiency. The material was less affected by solution pH. When the initial concentration of RhB，PMS and the catalyst were 50 mg/L，250 mg/L and 0.05 g/L，respectively，RhB could be degraded by more than 99% within 30 min with the initial solution pH ranging from 3 to 10，the recyclability test revealed that the catalyst could be used continuously with stable and effective catalytic activity，the degradation rate of RhB was still higher than 95% in the fifth cycle use of catalyst.

Key words: zeolite imidazole frameworks, Rhodamine B, peroxymonosulfate, catalytic degradation

中图分类号: 

• X703.1