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| Phenanthrene Adsorption on Biochars Produced from Different Biomass Materials at Two Temperatures |
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| KeyWord:biochar; feedstock materials; heat treatment temperatures; phenanthrene; adsorption |
| Author Name | Affiliation | | YAN Yu | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | WANG Zi-ying | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | JIN Jie | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | QIU Meng-yi | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | HAN Lan-fang | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | SUN Ke | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China |
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| Abstract: |
| The properties of biochars are profoundly influenced by biomass materials and pyrolytic temperature. Different biochars produced from swine manure, maize stalk, and wood-dust at two heating temperatures（HTTs, 250 and 400 ℃） were characterized and their adsorption of phenanthrene（PHE） was investigated. The physical and chemical properties of the biochars varied greatly with pyrolytic temperatures and feedstocks. The relatively high-temperature biochars（RHTBs） had fewer polar functional groups, higher ash contents, and more aromaticity than the relatively low-temperature biochars（RLTBs） did, indicating that hydrophobicity of biochars increased with increasing HTTs. The RHTBs showed greater CO2-surface areas（CO2-SAs） than RLTBs, indicating more porous surface structure of the RHTBs. At the same HTT, the plant residue-derived biochar（PLABs） had greater CO2-SAs than animal waste-derived biochar（ANIBs）, but ANIBs had significantly higher ash contents than PLABs did. The adsorption isotherms of PHE on biochars were nonlinear and well fitted by Freundlich model. The RHTBs produced from swine manure and maize residue exhibited higher PHE adsorption capacity compared to the RLTBs, indicating that HTTs influenced the adsorption capacity. The ANIBs had higher PHE adsorption capacity than PLABs at the same HTT, which may be influenced by the ash contents. Negative correlation of Freundlich coefficient（n） with CO2-SA and the aromaticity of biochars suggested pore-filling mechanism and π-π bonding interactions, respectively. The results of this study highlight the impact of feedstocks and HTTs on biochar characteristics and thus adsorption behaviors. |
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