Abstract:

The γ-Al₂O₃/SiO₂ adsorbentwas prepared by biomineralization regulating ciprofloxacin， whose morphology and microstructure were characterized and its absorption mechanism to CIP was investigated. During the preparation of γ-Al₂O₃/SiO₂ by impregnation method， different concentrations of CIP were used to control the morphology and microstructure of γ-Al₂O₃/SiO₂.The results showed that with 0.1 mg/L of ciprofloxacin，the surface active site density N_t of the adsorbent increased from 6.68×10^-4 mol/g to 7.48×10^-4 mol/g，while the equilibrium adsorption amount increased from 8.60 mg/g to 9.30 mg/g. The adsorption reached the maximum value at pH=7.0，98% of ciprofloxacin exists in molecular form and 98% of the adsorbent surface is in ≡AlOH form. From the molecular morphology interaction and the FTIR analysis， it was speculated that the main adsorption mechanism was the surface complexation and metal ion coordination between ≡AlOH on the surface of γ-Al₂O₃/SiO₂ and CIP neutral molecules.

Key words: ciprofloxacin, controlled preparation, γ-Al₂O₃/SiO₂, adsorption mechanism

摘要：

采用环丙沙星（CIP）生物矿化调控制备γ-Al₂O₃/SiO₂吸附剂，研究所制备吸附剂的形貌与微结构变化及对CIP的吸附作用机制。在浸渍法制备γ-Al₂O₃/SiO₂的过程中，采用不同浓度的CIP调控γ-Al₂O₃/SiO₂的形貌与微结构。结果表明，采用0.1 mg/L CIP调控制备的吸附剂表面活性位密度（N_t ）由6.68×10^-4 mol/g增加到7.48×10^-4 mol/g，平衡吸附量由8.60 mg/g增加到9.30 mg/g。pH=7.0时平衡吸附量最大，此时CIP 98%以分子形态存在、吸附剂表面形态98%为≡AlOH。从两者之间的分子形态作用结合傅氏转换红外线光谱（FTIR）分析，推测吸附作用机制是γ-Al₂O₃/SiO₂表面的≡AlOH与CIP中性分子之间以表面络合和金属离子配位作用为主。

关键词: 环丙沙星, 调控制备, γ-Al₂O₃/SiO₂, 吸附机制

CLC Number: 

• X703.1