Effect of biochar particle size on hydrophobic organic compound sorption kinetics: Applicability of using representative size

Seju Kang, Jihyeun Jung, Jong Kwon Choe, Yong Sik Ok, Yongju Choi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Particle size of biochar may strongly affect the kinetics of hydrophobic organic compound (HOC) sorption. However, challenges exist in characterizing the effect of biochar particle size on the sorption kinetics because of the wide size range of biochar. The present study suggests a novel method to determine a representative value that can be used to show the dependence of HOC sorption kinetics to biochar particle size on the basis of an intra-particle diffusion model. Biochars derived from three different feedstocks are ground and sieved to obtain three daughter products each having different size distributions. Phenanthrene sorption kinetics to the biochars are well described by the intra-particle diffusion model with significantly greater sorption rates observed for finer grained biochars. The time to reach 95% of equilibrium for phenanthrene sorption to biochar is reduced from 4.6–17.9 days for the original biochars to < 1–4.6 days for the powdered biochars with < 125 μm in size. A moderate linear correlation is found between the inverse square of the representative biochar particle radius obtained using particle size distribution analysis and the apparent phenanthrene sorption rates determined by the sorption kinetics experiments and normalized to account for the variation of the sorption rate-determining factors other than the biochar particle radius. The results suggest that the representative biochar particle radius reasonably describes the dependence of HOC sorption rates on biochar particle size.

Original languageEnglish
Pages (from-to)410-418
Number of pages9
JournalScience of the Total Environment
Volume619-620
DOIs
Publication statusPublished - 2018 Apr 1

Keywords

  • Biochar
  • Hydrophobic organic compound
  • Intra-particle diffusion model
  • Particle size
  • Sorption kinetics

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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