| 基于静电喷射法活性多孔磁性炭球的制备及其对亚甲基蓝的吸附 |
| Activated magnetic porous carbon microspheres: Preparation based on electrostatic spraying and adsorption on methylene blue |
|
| 摘要: 在利用静电喷射一步法获得壳聚糖(CS)磁性微球(Fe3O4/CS)的基础上，对Fe3O4/CS进行高温炭化和碱活化处理获得活性磁性多孔炭球(A-Fe3O4/C)，并对A-Fe3O4/C吸附水中亚甲基蓝(MB)分子的性能进行了研究。在利用扫描电子显微镜、红外吸收光谱仪、比表面分析仪对制备微球的形貌和结构进行分析的基础上，深入研究溶液pH、吸附时间、温度以及活化剂种类等因素对A-Fe3O4/C吸附性能的影响。研究结果表明，A-Fe3O4/C对MB的吸附量随着pH值的增加而增大，且经KOH活化后的A-Fe3O4/C对MB表现出较优的吸附性能。A-Fe3O4/C对MB的吸附过程符合伪二级动力学方程和Langmuir等温线模型，理论最大吸附容量可达300.6 mg·g-1。此外，A-Fe3O4/C表现出良好的重复利用性能，6次循环后对MB的去除率没有明显下降。 |
| 关键词: 炭化 活化 静电喷射 Fe3O4 吸附 |
| 基金项目: 江苏省自然科学基金(No.BK20130969)资助。 |
| Abstract: Activated magnetic porous carbon microspheres (A-Fe3O4/C) based on chitosan (CS) were prepared using a two-step synthesis method. The prepared A-Fe3O4/C was employed as an adsorbent to remove the methylene blue (MB) from water. First, magnetic microspheres Fe3O4/CS were prepared through electrostatic spraying with CS and FeCl2/FeCl3 as the precursor. Subsequently, Fe3O4/CS was converted into A-Fe3O4/C using a combination method of high-temperature carbonization and alkali activation. The obtained magnetic microspheres were systematically characterized by scanning electron microscopy, Fourier transform infrared, and specific surface area analyzer, and several major factors of the adsorption-based removal were studied (e.g., pH of the solution, adsorbent dosage, temperature, contact time, as well as alkali activator). The removal efficiency was significantly dependent on the pH of the solution, and high pH values facilitated the removal of MB from water. The adsorption to MB was consistent with the pseudo second order kinetic equation, and the adsorption process was expressed using the Langmuir isotherm model. The maximum adsorption capacity of MB was examined as 300.6 mg·g-1. Notably, the synthesized adsorbent could be effectively regenerated and repeatedly used without significant capacity loss after six cycles. |
| Keywords: carbonization activation electrostatic spray Fe3O4 adsorption |
| 投稿时间：2022-10-14 修订日期：2023-02-15 |
| 摘要点击次数: 485 |
| 全文下载次数: 465 |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
