碘氧化铋/钨酸铜复合材料的制备及对氟喹诺酮类抗生素的吸附性能

为开发高效抗生素吸附剂，将钨酸铜通过静电作用负载到碘氧化铋晶体表面，制备了新型多金属氧酸盐复合材料（BiOI/CuWO₄），并以扫描电镜、傅里叶红外光谱与X射线能谱等对其进行表征.选用环丙沙星（CIP）、恩诺沙星（ENR）、诺氟沙星（NOR）、氧氟沙星（OFL）这4种典型氟喹诺酮类抗生素（FQs）作为研究对象，在建立同时测定这4种FQs的高效液相色谱分析方法基础上，研究了BiOI/CuWO₄对FQS的吸附性能及溶液pH值和吸附剂量等对吸附的影响.结果表明，实验浓度范围内BiOI/CuWO₄对NOR、CIP、ENR和OFL的最大吸附量分别为277.8、149.3、113.6和112.4 mg·g^-1，且能够在3 h内达到吸附平衡，吸附动力学符合准二级吸附动力学模型，对CIP、ENR和OFL的吸附等温线基本复合Langmuir模型，而对NOR的吸附则更加符合Freundlich模型.与其它吸附剂相比，BiOI/CuWO₄对4种典型FQs具有较高的吸附量及较好的重复利用性，更符合实际应用需求.

The preparation of BiOI/CuWO4 composite and its adsorption performance for fluoroquinolone antibiotics

Copper tungstate was electrostatically loaded onto the surface of iodine bismuth oxide crystals to obtain a novel polyoxometallate composite of BiOI/CuWO₄, whihc was characterized with scanning electron microscopy, Fourier transform infrared spectrometer, energy dispersive X-ray spectroscopy, and etc. The simultaneous determination of ciprofloxacin (CIP), enrofloxacin (ENR), norfloxacin (NOR) and oxfloxacin (OFL) with a high performance liquid chromatography was first developed, and the absorption performance of BiOI/CuWO₄ for the four fluoroquinolones and its influening factors such as pH value and adsorbent dosage were also investigated. The results show that BiOI/CuWO₄ presents favorable absorption towards FQs, with the maximum adsorption capacities for NOR, CIP, ENR and OFL being 277.8, 149.3, 113.6 and 112.4 mg·g^-1, respectively. The absorption equilibrium can be obtained in 3 h, and the data well fit the pseudo second-order kinetic model. The adsorption isotherms of CIP, ENR and OFL basically fit with Langmuir model, and the adsorption of NOR better fits with Freundlich model. Compared with other adsorbents, BiOI/CuWO₄ has high adsorption capacities for four FQs with good reusability, and is suitable for practical application.