Modeling adsorption kinetics of trichloroethylene onto biochars derived from soybean stover and peanut shell wastes

Mahtab Ahmad, Sang Soo Lee, Sang Eun Oh, Dinesh Mohan, Deok Hyun Moon, Young Han Lee, Yong Sik Ok

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Trichloroethylene (TCE) is one of the most hazardous organic pollutants in groundwater. Biochar produced from agricultural waste materials could serve as a novel carbonaceous adsorbent for removing organic contaminants from aqueous media. Biochars derived from pyrolysis of soybean stover at 300 °C and 700 °C (S-300 and S-700, respectively), and peanut shells at 300 °C and 700 °C (P-300 and P-700, respectively) were utilized as carbonaceous adsorbents to study batch aqueous TCE remediation kinetics. Different rate-based and diffusion-based kinetic models were adopted to understand the TCE adsorption mechanism on biochars. With an equilibrium time of 8-10 h, up to 69 % TCE was removed from water. Biochars produced at 700 °C were more effective than those produced at 300 °C. The P-700 and S-700 had lower molar H/C and O/C versus P-300 and S-300 resulting in high aromaticity and low polarity accompanying with high surface area and high adsorption capacity. The pseudo-second order and intraparticle diffusion models were well fitted to the kinetic data, thereby, indicating that chemisorption and pore diffusion were the dominating mechanisms of TCE adsorption onto biochars.

Original languageEnglish
Pages (from-to)8364-8373
Number of pages10
JournalEnvironmental Science and Pollution Research
Volume20
Issue number12
DOIs
Publication statusPublished - 2013 Apr 23
Externally publishedYes

Keywords

  • Black carbon
  • Charcoal
  • Crop residue
  • Proximate analysis
  • Slow pyrolysis
  • Sorption dynamics

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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