School of Chemical Engineering and Energy, Zhengzhou University, Kexue Road 100#, Zhengzhou, Henan 450001, PR China.
School of Chemical Engineering and Energy, Zhengzhou University, Kexue Road 100#, Zhengzhou, Henan 450001, PR China.
Sci Total Environ. 2018 Oct 15;639:428-437. doi: 10.1016/j.scitotenv.2018.05.171. Epub 2018 May 26.
Polydopamine microspheres (PDMPs) synthesized by a facile solution oxidation method were adopted as a potential adsorbent for the removal of Norfloxacin (NOR) from aqueous solution. The morphologies and properties of PDMPs were characterized using TEM, SEM, FTIR and pH. Parameters effects such as contact time, initial pH, initial concentration and ionic strength on the adsorption capacity of NOR onto PDMPs were studied. To maximize NOR removal from liquid phase, Box-Behnken experimental design (BBD) combined with response surface modeling (RSM) was employed based on the 17 preliminary experiments at 308 K. Optimum contact time, initial NOR concentration and initial pH value were found to be 97 min, 303 mg·L and 6.6, respectively, the corresponding NOR removal capacity was found to be 307 mg·g. Batch adsorption experiments under the optimal conditions were conducted to investigate kinetics, thermodynamics and adsorption isotherm. Kinetic analysis confirmed that the kinetic data were well described by Pseudo-second order model. The experimental equilibrium data were well fitted by Langmuir, Redlich-Peterson, Koble-Corrigan and Dubinin-Radushkevich models. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were calculated and the results indicated that the NOR adsorption onto PDMPs was spontaneous and endothermic. The adsorption process may be attributed to the electrostatic interaction, the formation of hydrogen bonds or π-π stacking interactions among the polydopamine (PDA) and NOR molecule.
通过简便的溶液氧化法合成的聚多巴胺微球（PDMPs）被用作从水溶液中去除诺氟沙星（NOR）的潜在吸附剂。采用 TEM、SEM、FTIR 和 pH 值对 PDMPs 的形态和性能进行了表征。研究了接触时间、初始 pH 值、初始浓度和离子强度等参数对 PDMPs 吸附 NOR 的影响。为了从液相中最大限度地去除 NOR，在 308 K 下进行了 17 次初步实验后，采用 Box-Behnken 实验设计（BBD）结合响应面建模（RSM）。发现最佳接触时间、初始 NOR 浓度和初始 pH 值分别为 97 min、303 mg·L 和 6.6，相应的 NOR 去除容量为 307 mg·g。在最佳条件下进行了批量吸附实验，以研究动力学、热力学和吸附等温线。动力学分析证实，动力学数据很好地符合准二级模型。实验平衡数据很好地符合 Langmuir、Redlich-Peterson、Koble-Corrigan 和 Dubinin-Radushkevich 模型。计算了吉布斯自由能、焓和熵等热力学参数，结果表明 NOR 吸附到 PDMPs 上是自发和吸热的。吸附过程可能归因于聚多巴胺（PDA）和 NOR 分子之间的静电相互作用、氢键的形成或π-π堆积相互作用。
