Cu–Co bimetallic organic framework as effective adsorbents for enhanced adsorptive removal of tetracycline antibiotics

• Published in: Scientific reports 2024-07, Vol.14 (1), p.17607-15, Article 17607
• Main Authors: Yue, Jiayuan, Zheng, Qi, Ding, Shushu, Yin, Yujian, Zhang, Xiaodan, Wang, Liyun, Gu, Yipeng, Li, Jiejia, Zhang, Yuhan, Shi, Yurou, Dong, Yuetan, Zhu, Qing, Duo, Huixiao
• Format: Article
• Language: English
• Subjects: 639/166; 639/301; 639/638; Adsorbents; Adsorption; Anti-Bacterial Agents - chemistry; Antibiotics; Antibiotics removal; Carbon dioxide; Cobalt; Cobalt - chemistry; Copper; Copper - chemistry; Cu-MOF@Co-MOF; Doxycycline; Humanities and Social Sciences; Kinetics; Metal-Organic Frameworks - chemistry; MOF-on MOF; multidisciplinary; Physicochemical properties; Science; Science (multidisciplinary); Tetracycline - chemistry; Tetracycline - isolation & purification; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water purification; Water Purification - methods; Water treatment
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-024-67986-8

In this study, the removal effect of a new MOF-on MOF adsorbent based on Cu–Co bimetallic organic frameworks on tetracycline antibiotics (TCs) in water system was studied. The adsorbent (Cu-MOF@Co-MOF) were synthesized by solvothermal and self-assembly method at different concentrations of Co 2+ /Cu 2+ . The characterization results of SEM, XRD, XPS, FTIR and BET indicated that the MOF-on MOF structure of Cu-MOF@Co-MOF exhibited the best recombination and physicochemical properties when the molar ratio of Co 2+ : Cu 2+ is 5:1. In addition, the Cu-MOF@Co-MOF have a high specific surface area and bimetallic clusters, which can achieve multi-target synergistic adsorption of TCs. Based on above advantages, Cu-MOF@Co-MOF provided a strong affinity and could efficiently adsorb more than 80% of pollutants in just 5 to 15 min using only 10 mg of the adsorbent. The adsorption capacity of tetracycline and doxycycline was 434.78 and 476.19 mg/g, respectively, showing satisfactory adsorption performance. The fitting results of the experimental data were more consistent with the Langmuir isotherm model and pseudo-second-order kinetic model, indicating that the adsorption process of TC and DOX occurred at the homogeneous adsorption site and was mainly controlled by chemisorption. Thermodynamic experiments showed that Cu-MOF@Co-MOF was thermodynamically advantageous for the removal of TCs, and the whole process was spontaneous. The excellent adsorption capacity and rapid adsorption kinetics indicate the prepared MOF-on MOF adsorbent can adsorb TCs economically and quickly, and have satisfactory application prospects for removing TCs in practical environments. The results of the study pave a new way for preparing novel MOFs-based water treatment materials with great potential for efficient removal.