Towards a better understanding on mercury adsorption by magnetic bio-adsorbents with Γ-Fe2O3 from pinewood sawdust derived hydrochar: Influence of atmosphere in heat treatment

Huabin Wang, Yong Liu, Jerosha Ifthikar, Lerong Shi, Aimal Khan, Zhulei Chen, Zhuqi Chen

Research output: Journal PublicationArticlepeer-review

67 Citations (Scopus)

Abstract

Pyrolysis under protective atmosphere was regarded as an indispensable process for the preparation of biomass-based adsorbents to achieve higher surface areas. In this paper, magnetic carbon composites (MCC) that fabricated under air atmosphere showed an adsorption capacity of 167.22 mg/g in 200 ppm Hg(II), which was significantly higher than magnetic biochar (MBC, 31.80 mg/g) that fabricated under traditional nitrogen protection, and this remarkable performance of MCC was consistent in a wide range of pHs. Based on BET, XRD, FTIR, SEM and Boehm titration, MCC was demonstrated with limited surface area (43.29 m2/g) but large amount of surface functional groups comparing with MBC. Additionally, γ-Fe2O3 with a high degree of crystallization was generated in MCC, which led to a better magnetic property and recyclability. Moreover, characterizations, Langmuir isotherm and pseudo-second-order kinetics demonstrated the chemisorption was dominant for MCC in mercury capture, and surface complexation co-precipitate of Hg4Fe8O16C56H40 were also formed.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalBioresource Technology
Volume256
DOIs
Publication statusPublished - May 2018

Keywords

  • Adsorption
  • Biochar
  • Carbon composite
  • Magnetic separation
  • Mercury removal

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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