title: Selective removal of polycyclic aromatic hydrocarbons (PAHs) from soil washing effluents using biochars produced at different pyrolytic temperatures.
abstract: Wheat straw biochars produced at 400, 600 and 800°C (BC400, BC600 and BC800) were used to selectively adsorb PAHs from soil washing effluents. For soil washing effluents contained Phenanthrene (PHE), Fluoranthene (FLU), Pyrene (PYR) and Triton X-100 (TX100), biochars at 2 (for BC800) or 6 g L(-1) (for BC400 and BC600) can remove 71.8-98.6% of PAHs while recover more than 87% of TX100. PAH removals increase with increasing biochar dose. However, excess biochar is detrimental to the recovery of surfactant. For a specific biochar dose, PAH removal and TX100 loss increase with increasing pyrolytic temperature. For BC400 and BC600, PAH removal follows the order of PHE>FLU>PYR, while the order is reversed with PYR>FLU>PHE for BC800. Biochars have much higher sorption affinity for PAHs than for TX100. It is therefore suggested that biochar is a good alternative for selective adsorption of PAHs and recovery of TX100 in soil washing process.
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA. Electronic address: ujn_lihl@163.com.
authors.forename: Helian
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Ronghui
authors.initials: R
authors.lastname: Qu
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Weilin
authors.initials: W
authors.lastname: Guo
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Han
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Fang
authors.initials: F
authors.lastname: He
authors.affiliation: School of Resources and Environment, University of Jinan, Jinan 250022, China; National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
authors.forename: Yibing
authors.initials: Y
authors.lastname: Ma
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; D002606:Charcoal; D006358:Hot Temperature; D011084:Polycyclic Aromatic Hydrocarbons / Q000302:isolation & purification*; D012989:Soil Pollutants / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D013501:Surface-Active Agents; C540010:biochar; D002606:Charcoal
keywords: Biochar; PAHs; Selective adsorption; Soil washing effluents; Surfactant recovery