Metal-organic frameworks (MOFs) with high porosity have attracted much attention in environment remediation. In this study, the copper-doped ZIF-8 (Cu-ZIF-8) was synthesized by an in-situ process of a zinc metal-organic framework (ZIF-8) in room temperature. The adsorption capacity of Cu-ZIF-8 towards tetracycline hydrochloride (TC) was 2.4 times higher than the pristine ZIF-8. The effects of adsorbent dosage, initial concentrations, solution pH values, coexisting ions and reaction temperature on adsorption capacity were investigated. The adsorption process of TC over Cu-ZIF-8 fitted well with pseudo-second-order and Langmuir models, which suggested that chemisorption was dominant in adsorption reaction and the Cu-ZIF-8 adsorbent had a homogenous surface for adsorption. Adsorption thermodynamic studies implied that the adsorption process was spontaneous and exothermic. In addition, the Cu-ZIF-8 adsorbent showed excellent adsorption performance towards TC in tap water, river water and pharmaceutical wastewater. This work provided a facile and efficient strategy to fabricate MOFs-based adsorbent for water purification.

高孔隙率的金属有机框架（MOF）在环境修复中引起了很多关注。在这项研究中，掺杂铜的ZIF-8（Cu-ZIF-8）是在室温下通过锌金属有机骨架（ZIF-8）的原位合成方法合成的。Cu-ZIF-8对四环素盐酸盐（TC）的吸附能力是原始ZIF-8的2.4倍。研究了吸附剂用量，初始浓度，溶液pH值，共存离子和反应温度对吸附容量的影响。TC在Cu-ZIF-8上的吸附过程与拟二阶和Langmuir模型吻合得很好，这表明化学吸附在吸附反应中占主导地位，Cu-ZIF-8吸附剂具有均匀的吸附表面。吸附热力学研究表明吸附过程是自发的且放热的。另外，Cu-ZIF-8吸附剂在自来水，河水和制药废水中对TC表现出优异的吸附性能。这项工作为制造用于水净化的基于MOFs的吸附剂提供了简便有效的策略。