文章摘要
颜 钰,王子莹,金 洁,邱梦怡,韩兰芳,孙 可.不同生物质来源和热解温度条件下制备的生物炭对菲的吸附行为[J].农业环境科学学报,2014,33(9):1810-1816.
不同生物质来源和热解温度条件下制备的生物炭对菲的吸附行为
Phenanthrene Adsorption on Biochars Produced from Different Biomass Materials at Two Temperatures
  
DOI:10.11654/jaes.2014.09.019
中文关键词: 生物炭  生物质来源  热解温度    吸附
英文关键词: biochar  feedstock materials  heat treatment temperatures  phenanthrene  adsorption
基金项目:
作者单位
颜 钰 北京师范大学环境学院 水环境模拟国家重点实验室 北京 100875 
王子莹 北京师范大学环境学院 水环境模拟国家重点实验室 北京 100875 
金 洁 北京师范大学环境学院 水环境模拟国家重点实验室 北京 100875 
邱梦怡 北京师范大学环境学院 水环境模拟国家重点实验室 北京 100875 
韩兰芳 北京师范大学环境学院 水环境模拟国家重点实验室 北京 100875 
孙 可 北京师范大学环境学院 水环境模拟国家重点实验室 北京 100875 
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中文摘要:
      以三种来源(猪粪便、玉米秸秆和松树木屑)的生物质为原料,分别在250 ℃和400 ℃温度条件下制备生物炭,对其理化性质进行表征,并研究菲在所选生物炭上的吸附行为及可能存在的吸附机制。结果显示,生物炭的理化性质随着生物质来源和热解温度条件的不同而有明显的变化;与250 ℃下制备的生物炭相比,400 ℃下制备的生物炭极性官能团数量更少,芳香度更高,疏水性更强,比表面积更大,孔结构发育更加完全,灰分含量更高;同一温度下,植物来源的生物炭比动物来源的生物炭的比表面积大,而动物来源的生物炭的灰分含量明显高于植物来源的生物炭。所有生物炭对菲的吸附行为都可以用Freundilich模型进行很好的拟合,且吸附等温线均显示出非线性;在猪粪便和玉米秸秆制备的生物炭中,400 ℃比250 ℃条件下制备的生物炭对菲有更强的吸附能力,表明吸附能力与热解温度有关;且同一热解温度下,动物来源的生物炭样品的吸附能力高于植物来源的生物炭样品,可能是由于其含有更多的灰分。Freundlich非线性指数n值与比表面积和芳香度之间均存在负相关关系,说明菲在生物炭上的吸附不仅有疏水效应,可能还存在着孔填充效应和π-π电子供体受体(EDA)反应等吸附机制的贡献。
英文摘要:
      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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