锆基MOF材料用于水中抗生素的吸附研究

Zrconium-based MOFs for Antibiotics Adsorption in Water

采用溶剂热合成法制备了锆基MOF材料PCN-777,通过扫描电镜、X射线衍射、傅立叶红外光谱分析、比表面积分析对材料的形貌、结构等进行了表征。合成的PCN-777,比表面积为519.44 m^2/g,平均孔径为3.12 nm。PCN-777对氟喹诺酮及磺胺类抗生素具有较好的吸附作用,最大吸附容量分别为35.46 mg/g和36.36 mg/g,吸附均遵循Langmuir等温吸附方程和准二级吸附动力学模型。在pH 4～10范围内,PCN-777对氟喹诺酮及磺胺类抗生素具有稳定的吸附能力,增加离子强度能够促进对抗生素的吸附。PCN-777用于淡水和海水中低浓度抗生素的吸附,去除率在90%以上。

Zrconium-based metal organic framework PCN-777 was prepared via a facile solvothermal method. The morphology and structure of PCN-777 were systematically characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunner-Emmet-Teller measurements (BET). The synthesized PCN-777 had a specific surface area of 519.44 m2/g and an average pore diameter of 3.12 nm. PCN-777 showed good adsorption performance for fluoroquinolone and sulfonamide antibiotics, and the maximum adsorption capacities of PCN-777 were 35.46 mg/g, 36.36 mg/g, respectively. The adsorptions followed the Langmuir isothermal adsorption and the pseudo-second- order adsorption kinetics models. PCN-777 had stable adsorption performance in the pH range of 4?10, the increase of ionic strength could promote the adsorption of antibiotics. PCN-777 was used to adsorb the antibiotics in fresh water and seawater with removal efficiencies up to 90%.