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Crayfish shell biochar modified with magnesium chloride and its effect on lead removal in aqueous solution

  • Jiaqi Zhang
  • Xiaolan Hu
  • Jinpeng Yan
  • Li Long
  • Yingwen XueEmail author
Research Article
  • 74 Downloads

Abstract

In this study, crayfish shell was pyrolyzed at 600 °C to obtain an unmodified biochar (CS600). MgCl2 was used as a modifier to pretreat crayfish shell to produce a modified biochar (CS600-MgCl2) under the same pyrolysis conditions. The two biochars were characterized for physicochemical properties and evaluated for lead (Pb2+) sorption ability to determine the modification mechanism. Mono-element batch adsorption experiments were conducted to compare the sorption performances of CS600 and CS600-MgCl2 to Pb2+ in aqueous solutions. All the experiments were carried out at pH of 7. According to the Freundlich–Langmuir model, CS600-MgCl2 had a higher adsorption capacity (152.3 mg/g) than CS600 (134.3 mg/g). FTIR, SEM, XRD, BET, and ICP analyses were applied to inform the interpretation of the mechanism. CS600 was calcium-rich and mainly removed Pb2+ through the ion exchange mechanism by replacing Ca2+ in the biochar. The increased Pb2+ adsorption capacity of CS600-MgCl2 was mainly due to the enlarged specific surface area and the formation of Mg3(OH)5Cl·4H2O on the modified biochar. Findings of this study suggest that both CS600 and CS600-MgCl2 can be used to remove heavy metal ions from wastewater and MgCl2 can improve the sorption performance of biochar.

Keywords

Lead removal Crayfish shell Biochar Adsorption Modification Ion exchange 

Notes

Funding information

This work was partially supported by the National “Twelfth Five-Year” Plan for Science & Technology Pillar Program (grant number 2014BAL04B04), and the Wuhan Water Engineering & Technology Co. Ltd.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  • Jiaqi Zhang
    • 1
  • Xiaolan Hu
    • 1
  • Jinpeng Yan
    • 1
  • Li Long
    • 1
  • Yingwen Xue
    • 1
    Email author
  1. 1.School of Civil EngineeringWuhan UniversityWuhanChina

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