title: Sorption of simazine to corn straw biochars prepared at different pyrolytic temperatures.
abstract: Simazine sorption to corn straw biochars prepared at various temperatures (100-600 °C) was examined to understand its sorption behavior as influenced by characteristics of biochars. Biochars were characterized via elemental analysis, BET-N(2) surface area (SA), FTIR and (13)C NMR. Freundlich and dual-mode models described sorption isotherms well. Positive correlation between log K(oc) values and aromatic C contents and negative correlation between log K(oc) values and (O + N)/C ratios indicate aromatic-rich biochars have high binding affinity to simazine (charge transfer (π-π*) interactions) and hydrophobic binding may overwhelm H-bonding, respectively. Dual-mode model results suggest adsorption contribution to total sorption increases with carbonization degree. Positive correlation between amounts of adsorption (Q(ad)) and SA indicates pore-filling mechanism. Comparison between our results and those obtained with other sorbents indicates corn straw biochars produced at higher temperature can effectively retain simazine. These observations will be helpful for designing biochars as engineered sorbents to remove triazine herbicides.
authors: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
authors: Guixiang
authors: G
authors: Zhang
authors: Qing
authors: Q
authors: Zhang
authors: Ke
authors: K
authors: Sun
authors: Xitao
authors: X
authors: Liu
authors: Wenjuan
authors: W
authors: Zheng
authors: Ye
authors: Y
authors: Zhao
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D017745:Incineration / Q000379:methods*; D012839:Simazine / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry
chemical_list: D006540:Herbicides; C540010:biochar; D002606:Charcoal; D012839:Simazine