title: Sorption of four hydrophobic organic contaminants by biochars derived from maize straw, wood dust and swine manure at different pyrolytic temperatures.
abstract: Sorption behavior of acetochlor (ACE), dibutyl phthalate (DBP), 17α-Ethynyl estradiol (EE2) and phenanthrene (PHE) with biochars produced from three feedstocks (maize straw (MABs), pine wood dust (WDBs) and swine manure (SWBs)) at seven heat treatment temperatures (HTTs) was evaluated. The bulk polarity of these biochars declined with increasing HTT while the aromaticity and CO2-surface area (CO2-SA) rose. The surface OC contents of biochars were generally higher than bulk OC contents. The organic carbon (OC)-normalized CO2-SA (CO2-SA/OC) of biochars significantly correlated with the sorption coefficients (n and logK(oc)), suggesting that pore filling could dominate the sorption of tested sorbates. SWBs had higher logK(oc) values compared to MABs and WDBs, due to their higher ash contents. Additionally, the logK(oc) values for MABs was relatively greater than that for WDBs at low HTTs (≤400 °C), probably resulting from the higher CO2-SA/OC, ash contents and aromaticity of MABs. Surface polarity and the aliphatic C may dominate the sorption of WDBs obtained at relatively low HTTs (≤400 °C), while aromatic C affects the sorption of biochars at high HTTs. Results of this work aid to deepen our understanding of the sorption mechanisms, which is pivotal to wise utilization of biochars as sorbents for hazardous organic compounds.
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
authors.forename: Ziying
authors.initials: Z
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
authors.forename: Lanfang
authors.initials: L
authors.lastname: Han
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China. Electronic address: sunke@bnu.edu.cn.
authors.forename: Ke
authors.initials: K
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Jin
authors.affiliation: Coastal Plains Soil, Water, and Plant Research Center, Agricultural Research Service, U.S. Department of Agriculture, 2611 West Lucas Street, Florence, SC, 29501, USA.
authors.forename: Kyoung S
authors.initials: KS
authors.lastname: Ro
authors.affiliation: Leibniz Institute for Agricultural Engineering, Max-Eyth-Allee 100, 14469 Potsdam-Bornim, Germany.
authors.forename: Judy A
authors.initials: JA
authors.lastname: Libra
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
authors.forename: Xitao
authors.initials: X
authors.lastname: Liu
authors.affiliation: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA.
authors.forename: Baoshan
authors.initials: B
authors.lastname: Xing
mesh_terms: D000327:Adsorption; D000818:Animals; D002606:Charcoal / Q000737:chemistry*; D003993:Dibutyl Phthalate / Q000302:isolation & purification; D004391:Dust / Q000032:analysis; D004785:Environmental Pollutants / Q000302:isolation & purification*; D006358:Hot Temperature; D057927:Hydrophobic and Hydrophilic Interactions; D008372:Manure / Q000032:analysis*; D009930:Organic Chemicals / Q000302:isolation & purification*; D010616:Phenanthrenes / Q000302:isolation & purification; D013499:Surface Properties; D013552:Swine; D013696:Temperature; D014934:Wood / Q000737:chemistry*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D004391:Dust; D004785:Environmental Pollutants; D008372:Manure; D009930:Organic Chemicals; D010616:Phenanthrenes; C540010:biochar; D002606:Charcoal; D003993:Dibutyl Phthalate; C031181:phenanthrene
keywords: Biochar; CO(2)-surface area; Minerals; Sorption; Surface polarity