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Chinese Journal of Environmental Engineering, Volume 12, Issue 10: 2855-2863(2018) https://doi.org/10.12030/j.cjee.201806023

Bamboo activated carbon adsorption and near infrared spectroscopy prediction of heavy metal in soil

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  • ReceivedJun 5, 2018
  • AcceptedJul 13, 2018

Abstract

Bamboo activated carbon (BAC) was prepared by the steam activation method and its pore structure characteristics were analyzed. In order to investigate the effect of bamboo activated carbon on soil remediation and improvement, a pot experiment was carried out. After cultivation soil heavy metal content, plant height, biomass, the heavy metal content in plant and underground adding bamboo activated carbon with different ratios (0%, 10% and 20%) were analyzed. The results showed that the pH value and organic matter of soil gradually increased, the content of heavy metal decreased obviously with an increase of the amount of bamboo activated carbon. Moreover, the removal rates of heavy metal Cu, Pb and Zn in soil were 94.8%, 82.1% and 87.7% with a high amount by adding 20% ratio of bamboo activated carbon in soil. The height and biomass of zinnia elegans were increased and the content of heavy metals in root and shoot were reduced. The effect of bamboo activated carbon was remarkable to remove copper ions for remediation and improvement of soil. Meanwhile, a prediction model for the content of copper ions in soil with different ratios of bamboo activated carbon combined with PLS (partial least square) was created by using near-infrared spectroscopy technique. The R2 was 0.995 9 and RPD was greater than 10 which indicated that the model had a good correlation and excellent accuracy for Cu2+ prediction in soil.


Funded by

国家林业局948项目(2014-4-04)


References

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  • Fig. 1

    Sketch map of zinnia elegans cultivation

  • Fig. 2

    Content change of heavy metals in soil by adding BAC of different ratios

  • Fig. 3

    X-ray diffraction intensity curves of bamboo activated carbon

  • Fig. 4

    Content of heavy metal copper in root and shoot of zinnia elegans

  • Fig. 5

    NIR spectra and their 2nd derivatives of soil with three kinds of ratios of bamboo activated carbon

  • Fig. 6

    NIR prediction model of copper ion content in soil

  • Table 1   Properties of soil sample

    pH

    全氮/(g·kg−1)

    全钾/(g·kg−1)

    有机质/(g·kg−1)

    铜/(mg·kg−1)

    铅/(mg·kg−1)

    锌/(mg·kg−1)

    7.84

    1.07

    12.58

    24.71

    26.58

    34.76

    76.32

  • Table 2   Pore characteristics of bamboo activated carbon and its adsorption to iodine

    比表面积 /(m2·g−1)

    孔容/ (cm3·g−1)

    平均孔径/nm

    微孔比率 /%

    碘吸附值/(mg·g−1)

    pH

    SBET

    Smicro

    Smeso

    Vtotal

    Vmicro

    Vmeso

    905

    830

    75

    0.613

    0.535

    0.078

    2.217

    87.276

    674.794

    9.26

  • Table 3   Properties of soil with different ratios of BAC after pot experiment

    添加量/%

    pH

    全氮/(g·kg−1)

    全钾/(g·kg−1)

    有机质/(g·kg−1)

    0

    5.60±0.06

    0.93±0.05

    14.40±2.93

    21.01±2.65

    10

    7.32±0.16

    0.89±0.04

    13.73±1.40

    22.42±2.06

    20

    7.42±0.04

    0.79±0.01

    13.50±1.15

    22.43±0.91

  • Table 4   Height and biomass of zinnia elegans

    BAC添加量/%

    百日草株高/cm

    百日草生物量/(10−2g)

    0

    1.28±0.36

    2.88±0.80

    10

    1.36±0.42

    2.92±1.23

    20

    1.46±0.39

    3.14±1.42

  • Table 5   Correlation between NIR and the content of cooper ions for soil

    模型类别

    模型参数

    测定值

    校正集

    R2

    0.999 6

    RMSEC

    1.15

    RPD

    51.7

    验证集

    R2

    0.995 9

    RMSEP

    2.99

    RPD

    15.6

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