高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (8): 2564.doi: 10.7503/cjcu20210077

• 物理化学 • 上一篇    下一篇

磁性纳米颗粒Fe3O4的醇改性制备机理及应用

徐艳1,3, 杨宏国2, 牛慧斌1,3, 田海林1,3, 朴红光2,3, 黄应平1,3, 方艳芬1,3()   

  1. 1.三峡大学生物与制药学院
    2.理学院
    3.三峡库区生态环境教育部工程研究中心, 宜昌 443002
  • 收稿日期:2021-02-03 出版日期:2021-08-10 发布日期:2021-08-05
  • 通讯作者: 方艳芬 E-mail:chem_ctgu@126.com
  • 基金资助:
    国家自然科学基金(21972073);国家重点研发计划项目(2017YFB0903702);“111”引智项目(D20015);湖北省引智项目(2019BJH004);中国博士后基金(2018M640721);三峡大学硕士论文培优基金(155)

Preparation Mechanism and Application of Alcohol⁃modified Fe3O4 Magnetic Nanoparticles

XU Yan1,3, YANG Hongguo2, NIU Huibin1,3, TIAN Hailin1,3, PIAO Hongguang2,3, HUANG Yingping1,3, FANG Yanfen1,3()   

  1. 1.College of Biological and Pharmaceutical Sciences
    2.College of Science
    3.Engineering Research Center of Eco?environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,China
  • Received:2021-02-03 Online:2021-08-10 Published:2021-08-05
  • Contact: FANG Yanfen E-mail:chem_ctgu@126.com

摘要:

利用化学沉淀法, 以乙二醇(EG)、 聚乙二醇(PEG)和甘露醇(D-M)分别为表面改性剂制备了改性的Fe3O4颗粒(分别命名为E-Fe3O4, P-Fe3O4和D-Fe3O4). 实验结果显示, 醇类分子能成功地修饰在Fe3O4颗粒表面, 但 未改变其形貌、 大小、 晶相和磁性.采用傅里叶变换红外光谱、 离子选择性电极法、 Zeta电位和接触角等 手段研究其改性机理, 发现P-Fe3O4和D-Fe3O4样品表面醇修饰与水分子介导的氢键有关, E-Fe3O4则通过表面羟基直接与乙二醇形成了更稳定的氢键, 即使经热处理(120 ℃)乙二醇分子仍被固定在Fe3O4表面. 表面带有疏水基团的E-Fe3O4具有适中的亲水性(接触角32.92°)和水中分散性(粒径200~300 nm). 带负电荷的E-Fe3O4被应用于水中阳离子染料结晶紫(CV)的吸附和磁性分离, 对CV吸附量为19.33 mg/g, 是未改性前(8.41 mg/g)的2.3倍, 通过外加异丙醇可以促进CV脱附.

关键词: 四氧化三铁, 醇类改性, 分散性, 去除, 结晶紫

Abstract:

Herein, modified Fe3O4 particles(named as E-Fe3O4, P-Fe3O4 and D-Fe3O4, respectively) were prepared by chemical precipitation method using ethyleneglycol(EG), polyethylene glycol(PEG) and mannitoll(D-M) as the separated modifier. The results showed that the alcohol molecules can be successfully modified on the surface of Fe3O4 particles, and the morphology, size, crystal phase and magnetic properties of Fe3O4 particles are not significantly affected. Modification mechanisms of Fe3O4 samples are studied by Fourier transform infrared spectroscopy, ion selective electrode method, Zeta potential and water contact angle tests. It is shown that the modification mechanism of P-Fe3O4 and D-Fe3O4 samples are associated with the hydrogen bonding of water molecules mediated, while more stable hydrogen bond can be formed between ethylene glycol and hydroxyl group on the surface of E-Fe3O4. Consequently, ethylene glycol was still fixed on the surface of Fe3O4 even under high temperature treatment(120 ℃). E-Fe3O4 with hydrophobic group on the surface exhibits optimal hydrophilicity(contact angle was 32.92°) and water dispersion behavior(diameter was about 200―300 nm). E-Fe3O4 with negative surface charge can be applied to remove cationic dye crystal violet(CV) from water and adsorption capacity was 19.33 mg/g, which was 2.3 times of that pristine Fe3O4(8.41 mg/g). Besides, the addition of isopropanol is beneficial for CV desorption. This study not only provides a new method for preparing magnetic nano-Fe3O4 adsorption material, but also provides a theoretical basis for its application in the separation and adsorption of dye wastewater.

Key words: Fe3O4, Alcohol modification, Dispersion behavior, Remove, Crystal violet

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