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NaOH浓度对树脂基HFO复合吸附剂的结构及除磷影响

孙健 尚依依 徐兆郢 薛崇灏 赵平歌 张格红

孙健, 尚依依, 徐兆郢, 等. NaOH浓度对树脂基HFO复合吸附剂的结构及除磷影响[J]. 复合材料学报, 2021, 39(0): 1-10
引用本文: 孙健, 尚依依, 徐兆郢, 等. NaOH浓度对树脂基HFO复合吸附剂的结构及除磷影响[J]. 复合材料学报, 2021, 39(0): 1-10
Jian SUN, Yiyi SHANG, Zhaoying XU, Chonghao XUE, Pingge ZHAO, Gehong ZHANG. Effect of NaOH concentration on structure and phosphate adsorption of polymer-based hydrated ferric oxide composite adsorbents[J]. Acta Materiae Compositae Sinica.
Citation: Jian SUN, Yiyi SHANG, Zhaoying XU, Chonghao XUE, Pingge ZHAO, Gehong ZHANG. Effect of NaOH concentration on structure and phosphate adsorption of polymer-based hydrated ferric oxide composite adsorbents[J]. Acta Materiae Compositae Sinica.

NaOH浓度对树脂基HFO复合吸附剂的结构及除磷影响

基金项目: 国家自然科学基金 (51908439);陕西省教育厅专项科学研究计划项目 (19JK0395);陕西省自然科学基础研究计划资助项目 (2021JM-424)
详细信息
    通讯作者:

    孙健,博士,讲师,研究方向为污水处理、再生水回用 E-mail: 201sun@163.com

  • 中图分类号: X703

Effect of NaOH concentration on structure and phosphate adsorption of polymer-based hydrated ferric oxide composite adsorbents

  • 摘要: 树脂基HFO(Hydrated ferric oxide,HFO)复合吸附剂以磷吸附容量大、吸附速率快、洗脱率高等特点,受到广泛关注,但不同NaOH浓度制备的复合吸附剂结构和吸附性能是否一样尚不清楚。通过考察NaOH浓度对树脂基HFO复合吸附剂的结构和除磷性能影响,为优化D213-HFO复合吸附剂制备提供依据。结果表明,NaOH浓度从1 mol·L−1增加至6 mol·L−1,复合吸附剂的HFO负载量(约为16wt%,以Fe质量分数计)和晶体结构无显著差异,但复合吸附剂负载纳米HFO颗粒团聚程度降低,分布更均匀。此外,随着NaOH浓度增加,复合吸附剂的磷吸附容量先增加后稳定(18 mg·g−1)。另外,复合吸附剂吸附磷的平衡时间为240 min,更符合准一级动力学模型(R2 > 0.99),最佳吸附pH为6~8,相同浓度时共存离子对磷吸附影响程度为SO42− > Cl > NO3。在连续5个吸附洗脱周期内,复合吸附剂的磷洗脱率均接近100%。实验表明,随NaOH浓度增加,复合吸附剂负载HFO颗粒分布更均匀,磷吸附容量先增加后稳定,但晶体结构、吸附平衡时间、最佳pH范围、共存离子影响趋势及洗脱效果均无显著差异。

     

  • 图  1  D213树脂与D213-水合氧化铁(HFO)复合吸附剂的切面SEM图

    Figure  1.  SEM images of section of D213 and D213-Hydrated ferric oxide (HFO) composite adsorbents

    图  2  D213和D213-HFO复合吸附剂的FTIR图谱

    Figure  2.  FTIR spectra of D213 and D213-HFO composite adsorbents

    图  3  D213-HFO复合吸附剂的TEM和Fe元素线扫分布图

    Figure  3.  TEM and Fe element line scanning distribution images of D213-HFO composite adsorbents

    图  4  D213-HFO复合吸附剂的XRD图

    Figure  4.  XRD images of D213-HFO composite adsorbents

    图  5  D213-HFO复合吸附剂对P的吸附等温线

    Figure  5.  Adsorption isotherms of P onto D213-HFO composite adsorbents

    图  6  D213和D213-HFO复合吸附剂的吸附动力学曲线

    Figure  6.  Adsorption kinetic curves of D213 and D213-HFO composite adsorbents

    图  7  pH对P在D213-HFO复合吸附剂上吸附效果的影响

    Figure  7.  Effect of pH on P adsorption by D213-HFO composite adsorbents

    图  8  共存离子对D213和D213-HFO复合吸附剂吸附P效果的影响

    Figure  8.  Effect of co-existing ions on P adsorption by D213 and D213-HFO composite adsorbents

    图  9  连续5个周期内D213-HFO复合吸附剂的P吸附容量和P洗脱率

    Figure  9.  Adsorption capacity and regeneration efficiency of P by D213-HFO composite adsorbents during 5 continuous cycles

    表  1  不同NaOH浓度制备的复合吸附剂

    Table  1.   The composite adsorbents prepared with various NaOH concentrations

    NaOH concentration/
    (mol·L−1)
    HFO loadings/
    (Fe wt%)
    Adsorbents
    115.7D213-HFO-1
    316.0D213-HFO-3
    615.9D213-HFO-6
    Note: HFO—Hydrated ferric oxide.
    下载: 导出CSV

    表  2  D213-HFO复合吸附剂的Freundlich模型和Langmuir模型拟合参数

    Table  2.   Isothermal adsorption model fitting parameters of Langmuir and Freundlich model by D213-HFO composite adsorbents

    AdsorbentsLangmuir modelFreundlich model
    qm/(mg·g−1)b/(L·mg−1)R2K/(mg1-1/n·L1/n·g−1)1/nR2
    D213-HFO-113.310.260.9704.340.300.955
    D213-HFO-317.940.200.9734.900.340.939
    D213-HFO-618.070.150.9774.390.370.926
    Notes: qm―Maximum adsorption capacity; b, K and n―Isotherm constants.
    下载: 导出CSV

    表  3  D213和D213-HFO复合吸附剂的吸附动力学拟合参数

    Table  3.   Kinetic fitting parameters of D213 and D213-HFO composite adsorbents

    AdsorbentsPseudo-first-orderPseudo-second-orderIntra-particle diffusion
    qe/
    (mg·g−1)
    k1/
    min−1
    R2qe/
    (mg·g−1)
    k2/
    (g·mg−1·min−1)
    R2C1kd1/
    (mg·g−1·min−1/2)
    R12C2kd2/
    (mg·g−1·min−1/2)
    R22
    D21315.230.0280.99817.3120.90.978−1.911.830.97213.530.110.616
    D213-HFO-119.730.0150.99920.266.690.988−3.391.950.9959.230.670.893
    D213-HFO-319.870.0160.99924.496.870.989−3.311.970.9959.220.690.881
    D213-HFO-619.840.0170.99925.477.380.989−3.312.010.99610.060.640.870
    Notes: k1―Pseudo-first-order kinetic constant; k2―Pseudo-second-order kinetic constant; qe―Phosphate adsorption capacity in equilibrium; kd―Intra-particle diffusion rate constant; C―Reaction constant.
    下载: 导出CSV
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  • 收稿日期:  2021-10-29
  • 录用日期:  2021-11-26
  • 修回日期:  2021-11-25
  • 网络出版日期:  2021-12-31

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