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Adsorption of Basic Dyes Using Walnut Shell-based Biochar Produced by Hydrothermal Carbonization

  • Chunli Kang
  • Ling Zhu
  • Yixue Wang
  • Yuhan Wang
  • Kunkun Xiao
  • Tao Tian
Article

Abstract

Hydrothermal carbon(HC) was prepared from walnut shells which are abundant in Northeastern China. The prepared HC was used as a precursor to produce nitric acid modified carbon(MC). The hydrothermal carbonization included dehydration and decarboxylation processes wherein the hemicellulose was completely decomposed and the cellulose was partly decomposed, with some oxygen-containing functional groups being produced. The aromaticity, specific surface area and pore content of the HC increased, but its polarity decreased. With 6 mol/L nitric acid and a modification time of 15 min, the specific surface area and pore content decreased, but the proportion of oxygen-containing functional groups on the surface increased significantly, thereby improving the dye adsorption performance. The adsorption of methylene blue and malachite green was best described by the pseudo-second-order kinetic and Langmuir isotherm models. The adsorption capacity of MC was determined to be much larger than that of HC.

Keywords

Biochar Adsorption Walnut shell Hydrothermal carbonization Basic dyes 

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Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chunli Kang
    • 1
  • Ling Zhu
    • 1
  • Yixue Wang
    • 1
  • Yuhan Wang
    • 1
  • Kunkun Xiao
    • 1
  • Tao Tian
    • 1
  1. 1.Key Laboratory of Groundwater Resources and Environment(Jilin University), Ministry of EducationJilin UniversityChangchunP. R. China

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