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仿生FeS复合材料的制备及其对Cr(VI)的吸附性能

程爱华 常娟

程爱华, 常娟. 仿生FeS复合材料的制备及其对Cr(VI)的吸附性能[J]. 复合材料学报, 2023, 40(2): 884-892. doi: 10.13801/j.cnki.fhclxb.20220402.001
引用本文: 程爱华, 常娟. 仿生FeS复合材料的制备及其对Cr(VI)的吸附性能[J]. 复合材料学报, 2023, 40(2): 884-892. doi: 10.13801/j.cnki.fhclxb.20220402.001
CHENG Aihua, CHANG Juan. Preparation and its Cr(VI) adsorption properties of biomimetic FeS composites[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 884-892. doi: 10.13801/j.cnki.fhclxb.20220402.001
Citation: CHENG Aihua, CHANG Juan. Preparation and its Cr(VI) adsorption properties of biomimetic FeS composites[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 884-892. doi: 10.13801/j.cnki.fhclxb.20220402.001

仿生FeS复合材料的制备及其对Cr(VI)的吸附性能

doi: 10.13801/j.cnki.fhclxb.20220402.001
基金项目: 国家自然科学基金青年项目(51808442)National Natural Science Foundation Youth Project (51808442)
详细信息
    通讯作者:

    程爱华,博士,副教授,硕士生导师,研究方向为水处理技术 E-mail:cah_cheng@126.com

  • 中图分类号: TB332;X703.1

Preparation and its Cr(VI) adsorption properties of biomimetic FeS composites

  • 摘要: 纳米FeS比表面积大且还原性强,对Cr(VI)吸附性能优异,但不稳定、易团聚,为解决这一问题,本文以油菜花粉为生物模板,通过共沉淀-焙烧法制得仿生FeS复合材料(bioFeS)。通过SEM、XRD及XPS等方法对bioFeS复合材料的表面微观形态和结构进行了表征。以Cr(VI)为目标污染物,分别考察了吸附剂用量、反应时间、反应温度、初始Cr(VI)浓度和pH对bioFeS复合材料吸附Cr(VI)性能的影响,探究了反应机制。结果表明:油菜花粉生物模板成功分散了FeS,制得的bioFeS复合材料比表面积大,在反应时间为120 min、pH值为1、吸附剂投加量为0.2 g·L−1、反应温度为25℃的条件下,bioFeS复合材料对Cr(VI)的吸附量可达88.95 mg·g−1;该吸附过程符合准二级动力学和Langmuir等温吸附模型;共存离子NO3和SO42−会抑制Cr(VI)的去除。结合吸附动力学、热力学及XPS表面元素分析可知bioFeS复合材料除铬机制主要是吸附及化学还原作用。bioFeS复合材料处理含铬废水具有广阔的应用前景。

     

  • 图  1  FeS和仿生FeS(bioFeS)复合材料的SEM图像

    Figure  1.  SEM images of FeS and biomimetic FeS (bioFeS) composites

    图  9  bioFeS复合材料吸附Cr(VI)前后的XPS图谱:(a) C1s;(b) Fe2p;(c) S2p;(d) Cr2p

    Figure  9.  XPS spectra of bioFeS composites before and after adsorption of Cr(VI): (a) C1s; (b) Fe2p; (c) S2p; (d) Cr2p

    图  2  bioFeS复合材料的XRD图谱

    Figure  2.  XRD patterns of bioFeS composites

    图  3  FeS和bioFeS复合材料的孔径分布

    Figure  3.  Pore size distribution of FeS and bioFeS composites

    图  4  初始pH对bioFeS复合材料吸附Cr(VI)溶液Zeta电位及平衡pH的影响

    Figure  4.  Effect of initial pH on Zeta potential and equilibrium pH of adsorption Cr(VI) on bioFeS composites

    图  5  初始pH对bioFeS复合材料吸附Cr(VI)效果及铁离子浸出浓度的影响

    Figure  5.  Effect of initial pH on adsorption capacity of Cr(VI) on bioFeS composites and change of iron ion leaching concentration

    图  6  共存离子对bioFeS复合材料吸附Cr(VI)效果的影响

    Figure  6.  Effect of coexisting ions adsorption capacity of Cr(VI) on bioFeS composites

    图  7  不同吸附剂对Cr(VI)的吸附动力学

    Figure  7.  Adsorption kinetic of various adsorbents for Cr(VI)

    图  8  bioFeS复合材料的再生性

    Figure  8.  Regeneration property of bioFeS composites

    表  1  bioFeS复合材料BET比表面积和孔隙性质

    Table  1.   BET surface areas and pore properties of bioFeS composites

    SampleSBET/
    (m2·g−1)
    Pore volume/
    (cm3·g−1)
    Pore size/
    nm
    FeS 15.590.03811.87
    bioFeS
    composites
    173.510.122 5.78
    Note: SBET—BET surface area.
    下载: 导出CSV

    表  2  不同吸附剂吸附Cr(VI)的动力学参数

    Table  2.   Kinetic parameters of Cr(VI) adsorption by various adsorbents

    AdsorbentPseudo-first order modelPseudo-second order model
    k1/min−1R2qe/(mg·g−1)k2/(g·mg−1·min−1)R2qe/(mg·g−1)
    bioFeS composites0.04810.99137.7280.0120.99888.574
    Roasting FeS0.03960.91431.3250.0070.97869.686
    FeS0.04300.90029.9640.0040.98765.726
    Roasting pollen0.03290.92333.0160.0010.63344.952
    Notes: qe—Amount of adsorption at equilibrium; k1—Quasi-first-order kinetic model constant; k2—Quasi-second-order kinetic model constant; R—Correlation coefficient.
    下载: 导出CSV

    表  3  bioFeS复合材料吸附Cr(VI)的Langmuir和Freundlich吸附等温线参数

    Table  3.   Langmuir and Freundlich adsorption isotherm parameters of Cr(VI) adsorption by bioFeS composites

    AdsorbentLangmuir modelFreundlich model
    bR2Q0/(mg·g−1)KFR2n
    bioFeS composites0.0130.99794.9678.6920.9901.454
    Notes: Q0—Maximum adsorption capacity; b—Adsorption equilibrium constant of Langmuir model; KF—Adsorption equilibrium constant of Freundlich model; n—Adsorption strength constant in the Freundlich model.
    下载: 导出CSV

    表  4  bioFeS复合材料吸附Cr(VI)的热力学参数

    Table  4.   Thermodynamic parameters of Cr(VI) adsorption by bioFeS composites

    C0/(mg·L−1)ΔG/(kJ·mol−1)ΔH/(kJ·mol−1)ΔS/(kJ·mol−1·K−1)
    293 K298 K303 K
    10−21.082−22.687−23.27043.2110.220
    20−20.021−21.016−22.53253.4900.251
    30−19.103−20.644−21.73458.0520.264
    50−18.194−20.237−21.07666.4670.290
    100−17.186−19.986−20.78688.6160.362
    150−16.903−19.308−20.34284.1090.346
    Notes: C0—Initial concentration of the solution; ΔH—Enthalpy; ΔS—Entropy; ΔG—Gibbs free energy.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-12
  • 修回日期:  2022-03-21
  • 录用日期:  2022-03-26
  • 网络出版日期:  2022-04-06
  • 刊出日期:  2023-02-15

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