Sorption of phenanthrene to biochar modified by base
Sorption of phenanthrene to biochar modified by base
复制标题
碱改性生物炭对菲的吸附
DOI：
10.1007/s11783-017-0978-7
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发表时间：
2018-04-01
影响因子：
6.4
通讯作者：
Zhu, Lizhong
中科院分区：
文献类型：
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作者：
Feng, Zhengjun;Zhu, Lizhong
生物炭是去除土壤和水体中多环芳烃的潜在材料，碱改性是提高其吸附能力的有效方法。本研究合成了一系列碱改性生物炭，并评价了它们对菲的吸附性能。通过在五种温度（300°C、350°C、400°C、500°C和700°C）下热解三种原料（稻草、木材和竹子）来生产原始生物炭。用碱溶液洗涤生物质炭，进一步得到碱改性生物质炭。从低温热解（<500°C）的生物炭上清液中提取碱溶性碳（SC），其含量随着热解温度的升高而降低。在相同热解条件下，不同原料间SC含量的变化趋势为稻草>木材>竹材。结果表明，碱改性提高了菲在可提取SC的生物炭（可提取生物炭）上的吸附。而碱处理对不能提取SC的生物炭效果有限。这表明碱改性通过去除SC从而增加表面积和疏水性来改善菲对可萃取生物炭的吸附。因此，碱改性被建议用于改性可提取BC。
Biochar (BC) is a potential material for removal of polycyclic aromatic hydrocarbons from soil and water, and base modification is a promising method for improving its sorption ability. In this study, we synthesized a series of base-modified biochars, and evaluated their sorption of phenanthrene. Original biochars were produced by pyrolysis of three feedstocks (rice straw, wood and bamboo) at five temperatures (300°C, 350°C, 400°C, 500°C and 700°C). Base-modified biochars were further obtained by washing of biochars with base solution. The base soluble carbon (SC) was extracted from the supernatant, which were only obtained from biochars pyrolyzed at low temperatures (<500°C) and the content was decreased with the increase of pyrolysis temperature. The SC content between different feedstocks followed the trend of rice straw>wood>bamboo when same pyrolysis conditions were applied. It was found that base modification improved the sorption of phenanthrene on biochars that SC could be extracted from (extractable-BCs). However, base treatment but had limited effects for biochars that no SC could be extracted from. It suggested that base modification improved the sorption of phenanthrene to extractable-BCs by removing the SC and thus increasing the surface area and hydrophobicity. Therefore, base modification was suggested to be used in modifying extractable-BCs.