title: Enhanced PCBs sorption on biochars as affected by environmental factors: Humic acid and metal cations.
abstract: Biochar plays an important role in the behaviors of organic pollutants in the soil environment. The role of humic acid (HA) and metal cations on the adsorption affinity of polychlorinated biphenyls (PCBs) to the biochars in an aqueous medium and an extracted solution from a PCBs-contaminated soil was studied using batch experiments. Biochars were produced with pine needles and wheat straw at 350 °C and 550 °C under anaerobic condition. The results showed that the biochars had high adsorption affinity for PCBs. Pine needle chars adsorbed less nonplanar PCBs than planar ones due to dispersive interactions and separation. Coexistence of HA and metal cations increased PCBs sorption on the biochars accounted for HA adsorption and cation complexation. The results will aid in a better understanding of biochar sorption mechanism of contaminants in the environment.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 71st East Beijing Road, Nanjing 210008, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Guodong
authors.initials: G
authors.lastname: Fang
authors.forename: H M S K
authors.initials: HM
authors.lastname: Herath
authors.forename: Yujun
authors.initials: Y
authors.lastname: Wang
authors.forename: Long
authors.initials: L
authors.lastname: Cang
authors.forename: Zubin
authors.initials: Z
authors.lastname: Xie
authors.forename: Dongmei
authors.initials: D
authors.lastname: Zhou
mesh_terms: D000327:Adsorption; D002412:Cations / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006812:Humic Substances; D008670:Metals / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*
chemical_list: D002412:Cations; D006812:Humic Substances; D008670:Metals; D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D011078:Polychlorinated Biphenyls