Abstract

Iron, copper oxides composite particles (Fe/Cu oxides CPs) were produced using rapid, single-step, green and sustainable pathway from biomolecules of pine needle extract and were adopted as a potential adsorbent for the removal of norfloxacin (NOR) and ofloxacin (OFLX) from aqueous solution. To understand the morphologies and properties of Fe/Cu oxides CPs, surface analysis via SEM image, EDS, TEM, XPS, BET and FTIR pattern were employed. The effects of factors such as contact time, reaction temperature, initial pH, initial concentration and ionic strength on the adsorption capacity of NOR or OFLX onto Fe/Cu oxides CPs were studied. Kinetic analysis confirmed that the kinetic data were well described by Double-constant rate equation. The experimental equilibrium data were well fitted by Redlich-Peterson, Koble-Corrigan and Dubinin-Radushkevich models and the maximum adsorption capacity of Fe/Cu oxides CPs calculated by Langmuir model for NOR and OFLX was 1.64 mmol/g and 1.26 mmol/g at 293 K, respectively. Thermodynamic parameters such as Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) were calculated and the results indicated that the NOR or OFLX adsorption onto Fe/Cu oxides CPs was spontaneous and endothermic. Adsorption mechanism of NOR and OFLX may be involved a combination of electrostatic interaction, the formation of hydrogen bonds, π-π stacking interactions, surface complexation, hydrophobic interaction.

摘要

铁、铜氧化物复合颗粒（Fe/Cu 氧化物 CPs）使用快速、单步、绿色和可持续的途径从松针提取物的生物分子中生产，并被用作去除诺氟沙星（NOR）和氧氟沙星的潜在吸附剂。 OFLX) 来自水溶液。为了了解 Fe/Cu 氧化物 CP 的形态和性质，采用了通过 SEM 图像、EDS、TEM、XPS、BET 和 FTIR 图案进行的表面分析。研究了接触时间、反应温度、初始 pH、初始浓度和离子强度等因素对 NOR 或 OFLX 对 Fe/Cu 氧化物 CP 吸附能力的影响。动力学分析证实，动力学数据由双恒速率方程很好地描述。Redlich-Peterson 很好地拟合了实验平衡数据，Koble-Corrigan 和 Dubinin-Radushkevich 模型以及通过 Langmuir 模型计算的 NOR 和 OFLX 的 Fe/Cu 氧化物 CP 的最大吸附容量在 293 K 下分别为 1.64 mmol/g 和 1.26 mmol/g。计算了吉布斯自由能 (ΔG)、焓 (ΔH) 和熵 (ΔS) 等热力学参数，结果表明 NOR 或 OFLX 吸附到 Fe/Cu 氧化物 CP 上是自发和吸热的。NOR和OFLX的吸附机理可能涉及静电相互作用、氢键的形成、π-π堆积相互作用、表面络合、疏水相互作用的组合。计算焓 (ΔH) 和熵 (ΔS)，结果表明 NOR 或 OFLX 吸附到 Fe/Cu 氧化物 CP 上是自发和吸热的。NOR和OFLX的吸附机理可能涉及静电相互作用、氢键的形成、π-π堆积相互作用、表面络合、疏水相互作用的组合。计算焓 (ΔH) 和熵 (ΔS)，结果表明 NOR 或 OFLX 吸附到 Fe/Cu 氧化物 CP 上是自发和吸热的。NOR和OFLX的吸附机理可能涉及静电相互作用、氢键的形成、π-π堆积相互作用、表面络合、疏水相互作用的组合。