摘要/Abstract
以UiO-66为前驱体制得UiO-66/CoSO4复合材料，借助扫描电子显微镜、透射电子显微镜、元素分析和比表面积分析等手段对复合材料的微观形貌和结构进行表征，采用吸附平衡实验，系统考察该复合材料的吸附性能.结果表明，在相同条件下UiO-66/CoSO4复合材料比UiO-66对盐酸左氧氟沙星的去除率提高26.5%，且复合材料在30 min对盐酸左氧氟沙星的吸附达到平衡，最大吸附容量为108.4 mg·g-1，其吸附特性符合假二级动力学模型.该UiO-66/CoSO4复合材料制备过程简单，对实际环境水样和土样中盐酸左氧氟沙星的去除率在94.7%以上，且经过5次再生循环使用后，吸附效率无明显下降.
关键词: UiO-66/CoSO4, 盐酸左氧氟沙星, 环境样品, 去除
In this work, a newly UiO-66/CoSO4 composite was prepared by introducing UiO-66 as precursor carrier. The morphology and structure of the presented UiO-66/CoSO4 composite were characterized by scanning electron microscopy, elemental analysis, specific surface area analysis and X-ray diffraction. The adsorption performance of UiO-66/CoSO4 towards levofloxacin hydrochloride (LV) in aqueous solution was investigated, and some parameters, such as pH value, temperature, contact time and initial concentration have been optimized. The results showed that the UiO-66/CoSO4 composite has significant adsorption performance for levofloxacin hydrochloride. Compared with the control material UiO-66, the removal efficiency of the composite towards levofloxacin hydrochloride increased by 20% under the same conditions, which indicated that the properties of the composites have been greatly improved. Within 5 min, 95.3% of levofloxacin hydrochloride can be removed, and the equilibrium adsorption (99.8%) was achieved within 30 min and the adsorption process could be described by pseudo-second-order kinetic model. The adsorption isotherm verified that the maximum adsorption capacity was up to 108.42 mg·g-1 and fitted well with the Langmuir isotherm model, which indicated that monolayer coverage of levofloxacin hydrochloride was formed on the surface of UiO-66/CoSO4 composite. Data obtained from thermodynamic study showed that the adsorption process is spontaneous endothermic reaction and the chemical adsorption might play major role to control step. The UiO-66/CoSO4 composite was easy to prepare with good reusability, and the adsorption efficiency is still higher than 92.2% after five cycles. Additionally, under the optimized condition, the UiO-66/CoSO4 composite was successfully applied for the removal of levofloxacin hydrochloride from environmental water and soil samples. It was found that above 94.7% of target can be removed by the as-prepared UiO-66/CoSO4 composite. This result proved that the composite with excellent recognition has been synthesized. The new UiO-66/CoSO4 composite prepared in this work provided a way to treatment levofloxacin hydrochloride in environment with broad application prospect.
Key words: UiO-66/CoSO4, levofloxacin hydrochloride, environmental samples, removal
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