镁改性蒙脱土/纤维素复合凝胶的制备及对磷酸盐的吸附性能

doi:10.11896/cldb.17120052

材料导报

2019, Vol. 33

Issue (12): 2076-2083 https://doi.org/10.11896/cldb.17120052

高分子与聚合物基复合材料

镁改性蒙脱土/纤维素复合凝胶的制备及对磷酸盐的吸附性能

王佳员, 王运, 杜保保, 王吟, 张晓东

上海理工大学环境与建筑学院,上海 200093

Synthesis of Magnesium-modified Montmorillonite/Cellulose Composite Hydrogel and Its Adsorption Performance for Phosphate

WANG Jiayuan, WANG Yun, DU Baobao, WANG Yin, ZHANG Xiaodong

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093

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摘要以纤维素为原料, 蒙脱土为填料,镁盐为改性剂,通过自由基接枝共聚合成新型镁改性蒙脱土/纤维素复合凝胶(Mg-MMT/MCC)。采用扫描电镜(SEM)、X射线衍射仪(XRD)和热重分析仪(TG)等测试了所得复合凝胶的表面形貌、微观结构和热稳定性,并对其溶胀性能进行了分析,同时研究了pH值、反应时间、温度、磷酸盐初始浓度对其吸附能力的影响。结果表明,镁改性蒙脱土的引入有利于凝胶形成明显的孔洞结构,孔径变大,孔壁变薄,且其热稳定性也有所改善。Mg-MMT/MCC对磷的吸附量随着溶液pH值的增大呈先增大后减小的趋势,在pH=7时吸附量达到最大。吸附等温数据同时符合Langmuir和Freundlich等温吸附模型,其饱和吸附容量为194.36 mg·g^-1,吸附过程符合拟二级动力学方程。此外,该吸附剂易于再生和重复利用。

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关键词: 纤维素复合凝胶镁改性蒙脱土磷酸盐

Abstract: Anovel magnesium-modified montmorillonite/cellulose composite hydrogel (Mg-MMT/MCC) was prepared by free radical graft-polymerization method with cellulose as raw material, montmorillonite as filler and magnesium salt as modifier. Scanning electron microscope (SEM),X-ray diffractometer (XRD), thermogravimetric analyzer (TG) were employed to characterize the surface morphology, microstructure and thermal stability of the obtained composite hydrogel, and its swelling property was also analyzed. Meanwhile, the effects of pH value, reaction time, tempe-rature, initial phosphate concentration on the phosphate adsorption capacity of Mg-MMT/MCC were studied. It could be found from the results that the introduction of magnesium modified montmorillonite contributed to the formation of obvious pore structure with larger pore size, thinner pore wall and improved thermal stability. The amount of phosphorus adsorbed by Mg-MMT/MCC increased first and then decreased with the increase of solution pH value, reaching the maxmum at pH=7. The adsorption isotherm data accorded with both Langmuir and Freundlich isotherm adsorption models, with the saturated adsorption capacity of 194.36 mg·g^-1. The adsorption kinetic was found to be conformed to the pseudo-second order model. Besides, it is worth noting that the Mg-MMT/MCC could be readily regenerated for reuse.

Key words: cellulose composite hydrogel magnesium-modified montmorillonite phosphate

发布日期: 2019-05-31

ZTFLH:	TB34
	X52

基金资助: 国家自然科学基金(21507086);上海市青年科技英才扬帆计划(16YF1408100;14YF1409900)

通讯作者: 625xiaogui@163.com

作者简介: 王佳员,于2016年9月至2019年5月就读于上海理工大学环境与建筑学院,主要从事水污染控制和新型环保材料研发等方向的研究。王吟,上海理工大学环境与建筑学院,讲师。2013年1月毕业于同济大学环境科学与工程学院,环境科学博士学位,主要从事水污染控制和水处理功能材料研发等方向的研究。

引用本文:

王佳员, 王运, 杜保保, 王吟, 张晓东. 镁改性蒙脱土/纤维素复合凝胶的制备及对磷酸盐的吸附性能[J]. 材料导报, 2019, 33(12): 2076-2083.
WANG Jiayuan, WANG Yun, DU Baobao, WANG Yin, ZHANG Xiaodong. Synthesis of Magnesium-modified Montmorillonite/Cellulose Composite Hydrogel and Its Adsorption Performance for Phosphate. Materials Reports, 2019, 33(12): 2076-2083.

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http://www.mater-rep.com/CN/10.11896/cldb.17120052 或 http://www.mater-rep.com/CN/Y2019/V33/I12/2076

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