Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (7): 1012-1018.DOI: 10.12068/j.issn.1005-3026.2021.07.015

• Resources & Civil Engineering • Previous Articles     Next Articles

Magnetic Bio-char Derived from Sewage Sludge and Its Adsorption Ability for Cu(Ⅱ) in Aqueous System

ZHAO Bing, ZHANG Ran, XU Xin-yang   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Revised:2020-09-28 Accepted:2020-09-28 Published:2021-07-16
  • Contact: ZHAO Bing
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Abstract: The novel magnetic bio-char(MBC), which was derived from sewage sludge in municipal wastewater treatment plant after pyrolysis and Fe2+/Fe3+ modification by loading nano-sized iron oxide particles.The MBC can be used for the adsorption of heavy metal ions in aqueous system remediation. The physical/chemical characteristics of MBC were revealed by VSM, SEM-EDS, XRD, FTIR and batch adsorption experiments. The results showed that the nano-sized γ-Fe2O3 particles grew on the surface of bio-char uniformly, and the saturation magnetization of MBC reached 13.53Am2/kg. In adsorption experiments, when the dosage of MBC was 1.25g/L, adsorption time was 24h, pH was 5.0, the adsorption capacity was 67.68mg/g which increased by 60.08% than that of bio-char. The Langmuir isothermal and pseudo-second-order model can describe adsorption process of magnetic bio-char well. The MBC derived from sewage sludge has significant adsorption capacity, which is easy to separate from aqueous system. This disposition can recycle solid waste to pollution treatment.

Key words: sewage sludge; magnetic particle; bio-char; copper; adsorption

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