The adsorptive removal of tetracycline (TC) was studied with three types of zirconium-based metal–organic frameworks (Zr-MOFs), UiO-66, NU-1000 and MOF-525. The adsorption kinetics best fitted with the pseudo-second-order kinetic model and the adsorption equilibrium was rapidly reached within 40 min on UiO-66 and NU-1000, and 120 min on MOF-525. The adsorption isotherms best fitted with Sips model, and the maximum Sips adsorption capacities of TC on UiO-66, NU-1000 and MOF-525 were 145 mg·g⁻¹, 356 mg·g⁻¹ and 807 mg·g⁻¹ respectively, which were much higher than common adsorbents. The X-ray photoelectron spectra measurements and the influence of pH suggested that the π-π interaction played a crucial role during the adsorption. Pore characteristics and topology of MOFs showed great effect on adsorption performance. The cages whose size match well with TC helped MOF-525 to get highest adsorption amount per surface area among MOFs we studied. The proper topology of NU-1000 contributed to its high adsorption rate. River water was also used to confirm the excellent adsorptive performance of these three Zr-MOFs in practical application. These results might aid us to comprehend the adsorption of TC on Zr-MOFs and expand the application of Zr-MOFs in water treatment for removal of emerging contaminants.

研究了UiO-66，NU-1000和MOF-525三种类型的锆基金属-有机骨架（Zr-MOF）对四环素（TC）的吸附去除作用。UiO-66和NU-1000在40分钟内和MOF-525在120分钟内迅速达到了最理想的拟二级动力学模型，并且吸附平衡迅速达到平衡。吸附等温线最好装有啜饮模型，和TC的最大啜饮吸附容量上UIO-66，NU-1000和MOF-525分别为145毫克·克^-1，356毫克·克^-1和807毫克·克^-1分别比普通吸附剂高得多。X射线光电子能谱测量和pH值的影响表明π-π相互作用在吸附过程中起着至关重要的作用。MOF的孔特征和拓扑结构对吸附性能有很大影响。在我们研究的MOF中，尺寸与TC相匹配的笼子使MOF-525的单位表面积吸附量最高。NU-1000的正确拓扑结构有助于其高吸附率。在实际应用中，还使用河水来证实这三种Zr-MOF的优异吸附性能。这些结果可能有助于我们理解TC在Zr-MOF上的吸附，并扩展Zr-MOF在水处理中去除新兴污染物的应用。