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咖啡渣生物质炭的制备及其对矿井水中氟离子的去除研究

侯嫔 李佳兴 张春晖 冉雅惠 吴盟盟 肖楠

侯嫔, 李佳兴, 张春晖, 冉雅惠, 吴盟盟, 肖楠. 咖啡渣生物质炭的制备及其对矿井水中氟离子的去除研究[J]. 矿业科学学报, 2021, 6(6): 746-754. doi: 10.19606/j.cnki.jmst.2021.06.014
引用本文: 侯嫔, 李佳兴, 张春晖, 冉雅惠, 吴盟盟, 肖楠. 咖啡渣生物质炭的制备及其对矿井水中氟离子的去除研究[J]. 矿业科学学报, 2021, 6(6): 746-754. doi: 10.19606/j.cnki.jmst.2021.06.014
Hou Pin, Li Jiaxing, Zhang Chunhui, Ran Yahui, Wu Mengmeng, Xiao Nan. Preparation of coffee residual based biochar and its removal of fluoride ions from mine water[J]. Journal of Mining Science and Technology, 2021, 6(6): 746-754. doi: 10.19606/j.cnki.jmst.2021.06.014
Citation: Hou Pin, Li Jiaxing, Zhang Chunhui, Ran Yahui, Wu Mengmeng, Xiao Nan. Preparation of coffee residual based biochar and its removal of fluoride ions from mine water[J]. Journal of Mining Science and Technology, 2021, 6(6): 746-754. doi: 10.19606/j.cnki.jmst.2021.06.014

咖啡渣生物质炭的制备及其对矿井水中氟离子的去除研究

doi: 10.19606/j.cnki.jmst.2021.06.014
基金项目: 

国家重点研发计划 2018YFC0406404-5

越崎青年学者资助计划 2020QN09

中央高校基本科研业务费专项资金 2020YQHH03

中关村至臻环保股份有限公司科技项目 U027025

详细信息
    作者简介:

    侯嫔(1985—),女,内蒙古包头人,副教授,博士,主要从事环境材料的制备及其在水处理中应用方面的研究工作。Tel:010-62331464,E-mail:phou.beijing@cumtb.edu.cn

  • 中图分类号: X712

Preparation of coffee residual based biochar and its removal of fluoride ions from mine water

  • 摘要: 近年来矿井水中氟离子含量超标问题尤为突出,不仅影响矿井水处理后的回用水质,而且危害人体健康。为了同时实现固废资源化利用和矿井水中氟离子的去除,本文以废弃咖啡渣为原料,采用化学活化法制备了一种新型矿井水中氟离子的吸附剂——咖啡渣生物质炭(CRB),通过单因素法优化了制备过程中的活化剂种类、活化温度和活化浓度;通过动力学和等温吸附实验对比分析了优化前后CRB对氟离子的吸附效能;通过表面物化特性表征探究了优化后的CRB(O-CRB)对氟离子的吸附机理。结果表明:当采用氯化锌为活化剂、浓度为4 mol/L、活化温度为400 ℃时,获得了吸附性能最优的O-CRB,其对氟离子的最大吸附量为2.20 mg/g,是活化前CRB的1.30倍;与优化前相比,O-CRB的中孔孔容量与比表面积明显增加,含氧官能基团(-COOH)含量和表面Zeta电位升高,且吸附氟离子后O-CRB表面的氯离子含量明显降低(3.27 % 至0.61 %)、氟离子含量明显增加(0.76 % 至10.34 %),从而可推测出O-CRB吸附氟离子的主要机理为静电吸附和离子交换。
  • 图  1  不同种类活化剂对CRB吸附效能的影响

    Figure  1.  Effect of different activators on adsorption efficiency of CRB

    图  2  不同浓度ZnCl2对CRB吸附效能的影响

    Figure  2.  Effect of different concentrations of ZnCl2 on adsorption efficiency of CRB

    图  3  不同活化温度对CRB吸附效能的影响

    Figure  3.  Effect of different activation temperatures on adsorption efficiency of CRB

    图  4  CRB与O-CRB对水中氟离子的动力学吸附曲线

    Figure  4.  Kinetic adsorption curve of fluoride in water for CRB and O-CRB

    图  5  CRB与O-CRB对水中氟离子的等温吸附曲线

    Figure  5.  Isothermal adsorption curves of fluoride in water for CRB and O-CRB

    图  6  CRB与O-CRB的扫描电镜图像

    Figure  6.  Scanning electron microscopy images of CRB and O-CRB

    图  7  CRB、O-CRB和F-OCRB的红外吸收光谱图

    Figure  7.  FTIR of CRB、O-CRB and F-OCRB

    图  8  CRB、O-CRB和F-OCRB的Zeta电位图

    Figure  8.  Zeta potential diagram of CRB、O-CRB and F-OCRB

    表  1  CRB与O-CRB的动力学吸附和等温吸附模型拟合参数

    Table  1.   Fitting parameters of kinetic and isothermal adsorption model for CRB and O-CRB

    类型 准一级动力学 准二级动力学 Langmuir Freundlich
    K1/min-1 R2 K2/g(mg min)-1 R2 qm/(mg·g-1) KL/(L·mg-1) R2 1/n KF R2
    CRB 0.003 41 0.775 0.078 4 0.999 1.69 3.18 0.999 0.200 1.11 0.952
    O-CRB 0.003 63 0.815 0.049 2 0.999 2.20 7.50 0.999 0.180 1.61 0.860
    下载: 导出CSV

    表  2  3种生物质炭的比表面积、孔容孔径分布和表面元素分析

    Table  2.   Specific surface area, pore volume distribution and surface element analysis of three biochars

    表面特性 CRB O-CRB F-OCRB
    微孔孔容/(cm3 ·g-1) 0.000 15 0.000 069 0.000 26
    中孔孔容/(cm3· g-1) 0.002 5 0.007 6 0.005 3
    总孔容/(cm3· g-1) 0.002 6 0.007 7 0.005 6
    比表面积/(m2· g-1) 0.17 2.49 1.89
    平均孔径/ nm 60.44 12.31 11.83
    cC/% 83.05 83.47 75.77
    cN/% 3.41 2.43 1.68
    cO/% 12.61 10.11 11.59
    cCl/% 0.17 3.27 0.61
    cF/% 0.76 0.73 10.34
    下载: 导出CSV
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  • 收稿日期:  2021-03-26
  • 修回日期:  2021-05-03
  • 刊出日期:  2021-12-01

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