中空磁性氧化石墨烯的制备及其对亚甲基蓝吸附性能

doi:10.11901/1005.3093.2020.579

材料研究学报

2021, Vol. 35

Issue (7): 517-525 DOI: 10.11901/1005.3093.2020.579

研究论文

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中空磁性氧化石墨烯的制备及其对亚甲基蓝吸附性能

阙爱珍, 朱桃玉, 郑玉婴(

)

福州大学材料科学与工程学院福州 350108

Preparation of Hollow Magnetic Graphene Oxide and Its Adsorption Performance for Methylene Blue

QUE Aizhen, ZHU Taoyu, ZHENG Yuying(

)

Department of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China

引用本文:

阙爱珍, 朱桃玉, 郑玉婴. 中空磁性氧化石墨烯的制备及其对亚甲基蓝吸附性能[J]. 材料研究学报, 2021, 35(7): 517-525.
Aizhen QUE, Taoyu ZHU, Yuying ZHENG. Preparation of Hollow Magnetic Graphene Oxide and Its Adsorption Performance for Methylene Blue[J]. Chinese Journal of Materials Research, 2021, 35(7): 517-525.

全文: PDF(7636 KB) HTML

摘要:

用共沉淀法将Fe₃O₄沉淀在PS微球上并用甲苯去除PS制备出Fe₃O₄@PS，再用超声将用Hummers法制备的氧化石墨烯包裹在Fe₃O₄@PS表面制备出中空磁性氧化石墨烯，研究了这种复合材料对模拟亚甲基蓝废水的吸附。结果表明：在55℃，用中空磁性氧化石墨烯对亚甲基蓝染料吸附60 min达到平衡，最大吸附量为349.85 mg·g^-1。吸附剂循环8次，吸附效率仍高于80%。用准二级动力学模型可很好地拟合中空磁性氧化石墨烯对亚甲基蓝的吸附。结果表明，吸附速率对亚甲基蓝染料的初始浓度较为敏感，主要为化学吸附。吸附过程符合Langmuir等温吸附模型，说明这种吸附为单层表面吸附。

关键词 ：复合材料, 吸附, 中空氧化石墨烯, 磁性, 亚甲基蓝

Abstract：

The Fe₃O₄ coated polystyrene microsphere (PS), namely Fe₃O₄@PS_{was firstly fabricated by co-precipitation method with FeCl₂·6H₂O and FeCl₃ as raw material, and PS microsphere as tempelate. Then Fe₃O₄@PS was immersed in toluene solution for removing the PS template. Next, the hollow Fe₃O₄ microsphere was coated with graphene oxide sheets under sonication to produce the hollow magnetic graphene oxide (HMGO). Subsequently, the absorption performance of the HMGO for methylene blue (MB) was assessed in an artificial waste MB solution. Results verified that the adsorption process reach to equilibrium at 55℃ after 60 min. The maximum adsorption capacity of MB on HMGO is 349.85 mg·g^-1. The adsorbent shows good stability and reusability, after 8 times recycling the adsorption rate is still higher than 80%. The adsorption process of MB on HMGO can be well fitted by Pseudo-second-order kinetic model and the adsorption rate is sensitive to the initial concentration. The adsorption isotherm conforms to the Langmuir isotherm model, and the adsorption process is a single-layer surface adsorption.}

Key words： composite adsorption hollow graphene oxide magnetic methylene blue

收稿日期: 2021-01-04

ZTFLH:

X703.5

基金资助:福建省科技创新计划(2012H6008);福州市科技创新计划(2013-G-92)

作者简介: 阙爱珍，女，1996年生，硕士生

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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2020.579 或 https://www.cjmr.org/CN/Y2021/V35/I7/517

图1 HMGO吸附MB前后以及磁铁分离HMGO效果

图2 Fe3O4、GO和HMGO的红外光谱

图3 GO，Fe3O4和HMGO的X射线衍射谱

图4 PS微球、Fe3O4、Fe3O4@PS和HMGO的扫描电镜照片以及HMGO的EDS图

图5 PS微球、Fe3O4和HMGO的粒径分布

图6 吸附时间对亚甲基蓝吸附的影响

图7 吸附动力学曲线拟合

表1 HMGO的准一级动力学和准二级动力学参数

图8 亚甲基蓝初始浓度对亚甲基蓝吸附的影响

图9 吸附等温线曲线的拟合

表2 HMGO的Langmuir和Freundlich吸附模型参数

图10 反应温度对亚甲基蓝吸附的影响

图11 吸附热力学曲线拟合

表3 HMGO的吸附热力学参数

图12 重复使用次数对亚甲基蓝吸附的影响

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