Environmental Science and Pollution Research

, Volume 25, Issue 14, pp 14032–14042 | Cite as

Enhanced adsorption of Cd(II) from aqueous solution by a magnesium oxide–rice husk biochar composite

  • Jiangxin Xiang
  • Qintie LinEmail author
  • Shuailong Cheng
  • Jianlong Guo
  • Xiaosheng Yao
  • Qianjun Liu
  • Guangcai Yin
  • Dingfa Liu
Research Article


In this study, a magnesium oxide–rice husk biochar composite (MgO–BCR) was successfully prepared by a MgO impregnation method, and its adsorption performance was investigated in Cd(II) aqueous solution. A pseudo-second-order kinetic model described the Cd(II) adsorption behaviour on BCR and MgO–BCR well, while a Langmuir adsorption isotherm was more suitable for Cd(II) adsorption on the adsorbent. The fitting results of the monolayer model indicated that the number of ions captured by per site varied between 0.97 and 1.09. The calculated thermodynamic parameters indicated that Cd(II) adsorption onto MgO–BCR was spontaneous and endothermic. Characterisation of the adsorbent revealed that in situ precipitation, surface complexation, and electrostatic attraction contributed to the Cd(II) adsorption. The adsorption capacities of rice husk biochar (BCR) and MgO–BCR for Cd(II) reached 6.36 and 18.1 mg/g, respectively. The results demonstrated that MgO–BCR composite could be used as an effective and eco-friendly adsorbent to enhance the removal of Cd(II) from aqueous solution.


Rice husk MgO–biochar Cadmium Adsorption mechanisms 


Funding information

This work was financially supported by the National Key Research and Development Project (2017YFD0801302), the National Natural Science Foundation of China (21677041, 41371317), the Science and Technology Project of Guangdong Province (2017B020216002), the YangFan Innovative and Entrepreneurial Research Team Project (2015YT02N012), and the Science and Technology Project of Guangzhou (201604020077).

Supplementary material

11356_2018_1594_MOESM1_ESM.docx (210 kb)
ESM 1 (DOCX 209 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Jiangxin Xiang
    • 1
  • Qintie Lin
    • 1
    • 2
    Email author
  • Shuailong Cheng
    • 1
  • Jianlong Guo
    • 1
  • Xiaosheng Yao
    • 1
  • Qianjun Liu
    • 1
  • Guangcai Yin
    • 1
  • Dingfa Liu
    • 2
  1. 1.School of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhouPeople’s Republic of China
  2. 2.Shanwei Jinruifeng Ecological Agriculture Co. LTDShanweiPeople’s Republic of China

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