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  • ISSN 1006-3080
  • CN 31-1691/TQ

热活化酸浸托贝莫来石制备多孔SiO2材料及其吸附性能

王志增 李通 王冬云 崔晓昱 丁锡锋 崔崇

王志增, 李通, 王冬云, 崔晓昱, 丁锡锋, 崔崇. 热活化酸浸托贝莫来石制备多孔SiO2材料及其吸附性能[J]. 华东理工大学学报(自然科学版), 2022, 48(2): 184-193. doi: 10.14135/j.cnki.1006-3080.20201229002
引用本文: 王志增, 李通, 王冬云, 崔晓昱, 丁锡锋, 崔崇. 热活化酸浸托贝莫来石制备多孔SiO2材料及其吸附性能[J]. 华东理工大学学报(自然科学版), 2022, 48(2): 184-193. doi: 10.14135/j.cnki.1006-3080.20201229002
WANG Zhizeng, LI Tong, WANG Dongyun, CUI Xiaoyu, DING Xifeng, CUI Chong. Preparation of Porous SiO2 Materials from Tobermorite and Their Adsorption Performances[J]. Journal of East China University of Science and Technology, 2022, 48(2): 184-193. doi: 10.14135/j.cnki.1006-3080.20201229002
Citation: WANG Zhizeng, LI Tong, WANG Dongyun, CUI Xiaoyu, DING Xifeng, CUI Chong. Preparation of Porous SiO2 Materials from Tobermorite and Their Adsorption Performances[J]. Journal of East China University of Science and Technology, 2022, 48(2): 184-193. doi: 10.14135/j.cnki.1006-3080.20201229002

热活化酸浸托贝莫来石制备多孔SiO2材料及其吸附性能

doi: 10.14135/j.cnki.1006-3080.20201229002
基金项目: 国家自然科学基金(51772153);浙江清华长三角研究院宁波分院鄞州区专项(20191218)
详细信息
    作者简介:

    王志增(1993—),男,山东菏泽人,博士生,主要研究方向为矿物材料功能化。E-mail:775717646@qq.com

    通讯作者:

    崔 崇,E-mail:cuichong@njust.edu.cn

  • 中图分类号: TQ170.1

Preparation of Porous SiO2 Materials from Tobermorite and Their Adsorption Performances

  • 摘要: 通过水热合成法制备具有良好结晶形态的托贝莫来石(TOB),采用不同温度(300、500、700 ℃)对TOB进行加热活化(产物分别表示为300H-TOB、500H-TOB、800H-TOB),然后对热活化后的TOB进行酸处理(产物分别表示为300AH-TOB、500AH-TOB、800AH-TOB),成功制备出多孔二氧化硅材料。采用X射线多晶衍射(XRD)、N2吸附-脱附、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等测试方法对多孔SiO2材料进行表征,结果表明,300AH-TOB样品的比表面积为570.25 m2/g,总孔容为0.747 m3/g。TOB经过热活化和酸处理后,钙离子选择性溶出,TOB的SiO2骨架保留下来,在TOB的链状八元环结构上原位形成大量的纳米尺度的孔结构。通过静态吸附实验探讨了TOB、300H-TOB、300AH-TOB 3种样品对碱性红2和结晶紫2种有机染料的吸附性能,结果表明在碱性红2和结晶紫中在分别加入0.4 g 3种样品时,TOB的吸附率分别为56.35%、47.69%,300H-TOB的吸附率分别为25.57%、42.69%,300AH-TOB的吸附率分别为91.46%、88.86%。

     

  • 图  1  TOB(a)和300AH-TOB(b)的TG和DSC曲线

    Figure  1.  TG、DSC curves of TOB (a) and 300AH-TOB (b)

    图  2  不同温度热处理后TOB的XRD图谱(a);煅烧TOB酸处理后的XRD图谱(b)

    Figure  2.  XRD patterns of TOB calcined at different temperatures (a); XRD patterns of calcined TOB after acid treatment (b)

    图  3  N2吸附-脱附等温线(a)和由2D-NLDFT方法计算的孔径分布曲线(b)

    Figure  3.  Nitrogen adsorption-desorption isotherms (a) and pore size distribution curves calculated by 2D-NLDFT method (b)

    图  4  TOB、300H-TOB和300AH-TOB的SEM形貌

    Figure  4.  SEM morphology of TOB, 300H-TOB and 300AH-TOB

    图  5  TOB(a)、300H-TOB(b)和300AH-TOB(c)的透射电镜形貌及衍射斑点图

    Figure  5.  TEM morphology and diffraction spectrogram of TOB (a), 300H-TOB (b) and 300AH-TOB (c)

    图  6  TOB的多孔形成示意图

    Figure  6.  Schematic diagram of porous formation of TOB

    图  7  TOB、300H-TOB和300AH-TOB对碱性红2(a)和结晶紫(b)的吸附率

    Figure  7.  Adsorption rate of ST (a) and CV (b) on TOB、300H-TOB and 300AH-TOB

    图  8  TOB, 300H-TOB和300AH-TOB的Zata电位图(a); pH对300AH-TOB吸附碱性红2和结晶紫的影响(b)

    Figure  8.  Zeta potential of TOB, 300H-TOB and 300AH-TOB(a); Effect of pH on the adsorption ST and CV of 300AH-TOB(b)

    图  9  300AH-TOB吸附碱性红2的Langmuir(a)和Freundlich(b)等温吸附模型拟合结果

    Figure  9.  Fitting results of Langmuir (a) and Freundlich (b) isotherms for ST adsorption on 300AH-TOB

    图  10  300AH-TOB吸附结晶紫的Langmuir(a)和Freundlich(b)等温吸附模型拟合结果

    Figure  10.  Fitting results of Langmuir (a) and Freundlich (b) isotherms for CV adsorption on 300AH-TOB

    图  11  300AH-TOB的再生循环吸附结果

    Figure  11.  Regeneration cycle adsorption results of 300AH-TOB

    表  1  TOB、300H-TOB、300AH-TOB的化学成分

    Table  1.   Chemical composition of TOB, 300H-TOB, 300AH-TOB

    Samples w/%
    SiO2CaOOthers
    TOB49.3138.3612.33
    300H-TOB54.7142.562.73
    300AH-TOB90.1109.89
    下载: 导出CSV

    表  2  不同温度热活化TOB经过盐酸处理后的纳米孔道参数

    Table  2.   Porosity parameters of HCl acid treatment samples thermally activated at different temperatures

    SampleSBET/(m2·g−1)SExternal/(m2·g−1)SMicro/(m2·g−1)VMicro/(cm3·g−1)VMeso/(cm3·g−1)VTotal/(cm3·g−1)
    TOB152.14123.8128.330.0110.6070.611
    300AH-TOB570.25437.76132.490.0570.6520.747
    500AH-TOB539.15421.21117.940.0500.6510.734
    700AH-TOB440.18337.93102.250.0430.5140.576
    SBET—Specific surface area; SMicro—Micropores specific surface area by t-plot method; SExternal—External surface area by t-plot method; VTotal—Total pore volume;
    VMicro—Microporous volume by t-plot method;VMeso— Mesopore volume
    下载: 导出CSV

    表  3  300AH-TOB吸附碱性红2的等温吸附模型拟合参数

    Table  3.   Isothermal adsorption model fitting parameters for ST adsorption on 300AH-TOB

    T/KFreundlichLangmuir
    Kf1/nR2b/(L·mg−1)qm/(mg·g−1)R2
    2983.850.410.953 0.1422.570.970
    3083.030.420.9490.0920.530.989
    3182.940.310.7650.0814.820.978
    下载: 导出CSV

    表  4  300AH-TOB吸附结晶紫的等温吸附模型拟合参数

    Table  4.   Isothermal adsorption model fitting parameters for CV adsorption on 300AH-TOB

    T/KFreundlichLangmuir
    Kf1/nR2b/(L·mg−1)qm/(mg·g−1)R2
    2987.520.190.821 0.2618.660.902
    3086.020.330.9520.1327.730.968
    3187.130.340.7980.0838.410.986
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-12-29
  • 网络出版日期:  2021-04-27
  • 刊出日期:  2022-04-22

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