Optimization and mechanisms of biosorption process of Zn(II) on rape straw powders in aqueous solution

  • Xin LiuEmail author
  • Bin Han
  • Chun-li Su
  • Qin Han
  • Ke-jie Chen
  • Zhao-qiong Chen
Research Article


The different part powders of rape straw as adsorbents were performed to remove zinc ions from aqueous solution in this work. The various factors on influencing removal efficiency of Zn(II) were investigated, and the operational conditions were optimized using the Box–Behnken design of response surface methodology (RSM). Under the optimum conditions obtained, the removal rates of Zn(II) were attained to 100.00%, 78.02%, and 17.00% by straw pith core, seedpods, and shell of rape straw, respectively. Equilibrium and kinetic models were applied to evaluate the adsorption behaviors of Zn(II) on the adsorbents. The equilibrium data were best described by the Langmuir isotherm model, which indicated that the adsorption behaviors were favorably monolayer adsorption processes. The biosorption capacities of Zn(II) were 34.66 mg g−1, 36.41 mg g−1, and 36.74 mg g−1 of rape straw pith core; 23.33 mg g−1, 23.85 mg g−1, and 24.30 mg g−1 of seedpods; and 11.19 mg g−1, 11.23 mg g−1, and 11.27 mg g−1 of shell, respectively, at the various temperatures of 20 °C, 30 °C, and 40 °C based on Langmuir isotherm equation. The pseudo-second-order kinetic model was well to determine the adsorption kinetics, which suggested that ion exchange were occurred during adsorption processes of Zn(II). The characteristics of adsorbents before and after adsorption of Zn(II) were measured using the methods of scanning electron microscope (SEM), zeta potential classes, energy dispersive spectrometer (EDS), and Fourier transform infrared spectroscopy (FT-IR), respectively. The results provided evidences for the adsorption mechanisms of Zn(II) including electrostatic attraction, ion exchange, and functional group involvement on the three part powders of rape straw in aqueous water.


Biosorption Zinc ions Rape straw Box–Behnken design 


Funding information

This research has been financially supported by the Sichuan Science and Technology Program (Grant Nos. 2018SZ0306 and 2018SZ0324) and managed by Sichuan Provincial Department of Science and Technology, Sichuan Province, China.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xin Liu
    • 1
    Email author
  • Bin Han
    • 1
  • Chun-li Su
    • 1
  • Qin Han
    • 1
  • Ke-jie Chen
    • 1
  • Zhao-qiong Chen
    • 1
  1. 1.School of Public HealthChengdu Medical CollegeChengduPeople’s Republic of China

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