In this study, the ZIF-67 catalyst is synthesized by reaction of cobalt nitrate hexahydrate with 2-methylimidazole at room temperature. The ZIF-67 catalyst shows excellent efficiency for the degradation of tetracycline (TC) in the presence of hydrogen peroxide. Moreover, the effects of catalyst dose, hydrogen peroxide concentration and tetracycline concentration for the degradation of tetracycline have also been studied. The free-radical quenching experiments indicate that the hydroxyl radical (⋅OH) is the predominant active species in the degradation. In addition, the catalyst has been successfully reused four times without obvious decrease in the degradation efficiency of TC, revealing the great reusability and stability of ZIF-67. Graphic Abstract 1. The ZIF-67 catalyst exhibites excellent efficiency for the degradation of tetracycline. 2. The ZIF-67 catalyst is synthesized from cobalt nitrate hexahydrate and 2-methylimidazole. 3. The free radical quenching experiments indicates that the hydroxyl radical (⋅OH) is the predominant active species in the degradation.

中文翻译：

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用于降解四环素的高效且可回收的 ZIF-67 催化剂

在本研究中，ZIF-67 催化剂是通过六水合硝酸钴与 2-甲基咪唑在室温下反应合成的。ZIF-67 催化剂在过氧化氢存在下对四环素 (TC) 的降解表现出优异的效率。此外，还研究了催化剂剂量、过氧化氢浓度和四环素浓度对四环素降解的影响。自由基猝灭实验表明羟基自由基 (⋅OH) 是降解中的主要活性物质。此外，该催化剂已成功重复使用四次，TC的降解效率没有明显下降，表明ZIF-67具有良好的重复使用性和稳定性。图文摘要 1. ZIF-67 催化剂在降解四环素方面表现出优异的效率。2. ZIF-67催化剂由六水硝酸钴和2-甲基咪唑合成。3. 自由基猝灭实验表明羟基自由基（·OH）是降解中的主要活性物质。