化工学报 ›› 2020, Vol. 71 ›› Issue (3): 1060-1071.doi: 10.11949/0438-1157.20190488

• 分离工程 • 上一篇    下一篇

功能化磁性纳米复合材料Fe3O4-mPD/SP吸附Cr(Ⅵ)研究

杨鑫宇(),吴杰,张建庭,吴纯鑫,赵德明()   

  1. 浙江工业大学化学工程学院,浙江 杭州 310014
  • 收稿日期:2019-05-08 修回日期:2020-01-07 出版日期:2020-03-05 发布日期:2020-02-26
  • 通讯作者: 赵德明 E-mail:2111701036@zjut.edu.cn;dmzhao@zjut.edu.cn
  • 作者简介:杨鑫宇(1995—),男,硕士研究生,2111701036@zjut.edu.cn
  • 基金资助:
    浙江省自然科学基金资项目(LY19B070006);浙江省基础公益研究计划项目(LGF20B070003)

Study on adsorption of Cr() by functionalized magnetic Fe3O4-mPD/SP nanocomposites

Xinyu YANG(),Jie WU,Jianting ZHANG,Chunxin WU,Deming ZHAO()   

  1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2019-05-08 Revised:2020-01-07 Online:2020-03-05 Published:2020-02-26
  • Contact: Deming ZHAO E-mail:2111701036@zjut.edu.cn;dmzhao@zjut.edu.cn

摘要:

在超声波条件下先制得纳米Fe3O4颗粒,再在超声波辐照下一步合成氨基、亚氨基和磺酸基修饰的功能化磁性纳米复合材料Fe3O4-mPD/SP(50∶50),采用TEM、XRD、IR、TGA、VSM及BET对其进行表征,考察了其对Cr(Ⅵ)的吸附性能,结果表明:溶液pH对Cr(Ⅵ) 吸附影响显著,pH=2时,吸附效果最好;吸附剂投加量、竞争性阴离子(Cl-,NO3-,SO42-)、温度等均会对吸附Cr(Ⅵ) 造成一定影响。等温吸附数据符合Freundlich模型,KF=34.464 mg1-(1/n)·L1/n·g-1n=3.861;对Cr(Ⅵ) 的吸附为自发过程,?G0<0,?S0=73.368 J·mol-1·K-1,?H0=19.375 kJ·mol-1;准二级动力学方程能很好地描述Cr(Ⅵ) 在Fe3O4-mPD/SP(50∶50)上的吸附行为,k2=1.324×10-3 g·mg-1·min-1qe=77.157 mg·g-1;推测出吸附机理包括静电吸附,氧化还原和离子交换。

关键词: 超声波, 复合材料, 功能化Fe3O4, 吸附, Freundlich模型, 动力学

Abstract:

Nano-Fe3O4 particles are first synthesized under ultrasonic condition, and the ultrasonic enhanced functionalized nanocomposites Fe3O4-mPD/SP(50∶50) modified with amino, imino and sulfonic acid are synthesized in one step in presence of ultrasonic irradiation, which were characterized by TEM, XRD, IR, TGA, VSM and BET. The adsorption properties of Cr(Ⅵ) were investigated, which show that the pH value of the solution has a significant effect on the adsorption of Cr(Ⅵ) by Fe3O4-mPD/SP(50∶50), and the adsorption is best when pH=2. The amount of adsorbent, competitive anion(Cl-,NO3-,SO42-) and temperature all had effect on the adsorption of Cr(Ⅵ). The adsorption mechanism of Cr(Ⅵ) by Fe3O4-mPD/SP(50∶50) was discussed, which show that the quasi-second order kinetic equation can describe the adsorption behavior of Cr(Ⅵ) on Fe3O4-mPD/SP(50∶50) well, k2=1.324×10-3 g·mg-1·min-1, qe=77.157 mg·g-1; The isothermal adsorption data were in accordance with the Freundlich model, KF=34.464 mg1-(1/n) ·L1/n·g-1, n=3.861. The adsorption of Cr(Ⅵ) is a spontaneous process, ?G0<0,?S0=73.368 J·mol-1·K-1, ?H0=19.375 kJ·mol-1. It is inferred that the adsorption mechanism includes electrostatic adsorption, redox and ion exchange.

Key words: ultrasound, composites, functionalized Fe3O4, absorption, Freundlich model, kinetics

中图分类号: 

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