title: Modeling adsorption kinetics of trichloroethylene onto biochars derived from soybean stover and peanut shell wastes.
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.
authors.affiliation: Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon, 200-701, South Korea.
authors.forename: Mahtab
authors.initials: M
authors.lastname: Ahmad
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Lee
authors.forename: Sang-Eun
authors.initials: SE
authors.lastname: Oh
authors.forename: Dinesh
authors.initials: D
authors.lastname: Mohan
authors.forename: Deok Hyun
authors.initials: DH
authors.lastname: Moon
authors.forename: Young Han
authors.initials: YH
authors.lastname: Lee
authors.forename: Yong Sik
authors.initials: YS
authors.lastname: Ok
mesh_terms: D000327:Adsorption; D010367:Arachis / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D017745:Incineration; D007700:Kinetics; D008956:Models, Chemical; D013025:Glycine max / Q000737:chemistry; D014241:Trichloroethylene / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014866:Waste Products / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D014866:Waste Products; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D014241:Trichloroethylene