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Selective removal of polycyclic aromatic hydrocarbons (PAHs) from soil washing effluents using biochars produced at different pyrolytic temperatures

•Pyrolytic temperature influenced wheat straw-derived biochar properties.•Biochars selectively removed PAHs from effluents and recovered Triton X-100.•PAH removal and Triton X-100 loss increased with increasing pyrolytic temperature.•Selective adsorption was PAH property dependent. Wheat straw bioch...

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Published in:Bioresource technology 2014-07, Vol.163, p.193-198
Main Authors: Li, Helian, Qu, Ronghui, Li, Chao, Guo, Weilin, Han, Xuemei, He, Fang, Ma, Yibing, Xing, Baoshan
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cited_by cdi_FETCH-LOGICAL-c497t-9d8fe17fe5449dc6ceea0098023eb8459f839a347e46e1cc93dab4e60292c4893
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container_title Bioresource technology
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creator Li, Helian
Qu, Ronghui
Li, Chao
Guo, Weilin
Han, Xuemei
He, Fang
Ma, Yibing
Xing, Baoshan
description •Pyrolytic temperature influenced wheat straw-derived biochar properties.•Biochars selectively removed PAHs from effluents and recovered Triton X-100.•PAH removal and Triton X-100 loss increased with increasing pyrolytic temperature.•Selective adsorption was PAH property dependent. 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 6gL−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.
doi_str_mv 10.1016/j.biortech.2014.04.042
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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 6gL−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&gt;FLU&gt;PYR, while the order is reversed with PYR&gt;FLU&gt;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.</description><identifier>ISSN: 0960-8524</identifier><identifier>EISSN: 1873-2976</identifier><identifier>DOI: 10.1016/j.biortech.2014.04.042</identifier><identifier>PMID: 24813387</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Adsorption ; Biochar ; Biological and medical sciences ; Charcoal ; Fundamental and applied biological sciences. Psychology ; Hot Temperature ; PAHs ; Polycyclic Aromatic Hydrocarbons - isolation &amp; purification ; Selective adsorption ; Soil Pollutants - isolation &amp; purification ; Soil washing effluents ; Surface-Active Agents - chemistry ; Surfactant recovery ; Triticum aestivum</subject><ispartof>Bioresource technology, 2014-07, Vol.163, p.193-198</ispartof><rights>2014 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2014 Elsevier Ltd. 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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 6gL−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&gt;FLU&gt;PYR, while the order is reversed with PYR&gt;FLU&gt;PHE for BC800. Biochars have much higher sorption affinity for PAHs than for TX100. 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subjects Adsorption
Biochar
Biological and medical sciences
Charcoal
Fundamental and applied biological sciences. Psychology
Hot Temperature
PAHs
Polycyclic Aromatic Hydrocarbons - isolation & purification
Selective adsorption
Soil Pollutants - isolation & purification
Soil washing effluents
Surface-Active Agents - chemistry
Surfactant recovery
Triticum aestivum
title Selective removal of polycyclic aromatic hydrocarbons (PAHs) from soil washing effluents using biochars produced at different pyrolytic temperatures
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