| 孙 璇,李恋卿,潘根兴,郑聚锋,张旭辉,郑金伟,俞欣妍,王家芳.不同作物原料生物质炭对溶液芘的吸附特性[J].农业环境科学学报,2014,33(8):1637-1643. |
| 不同作物原料生物质炭对溶液芘的吸附特性 |
| Adsorption of Pyrene from Aqueous Solution by Biochars Produced from Different Crop Residues |
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| DOI：10.11654/jaes.2014.08.024 |
| 中文关键词: 作物原料 生物质炭 芘 吸附 |
| 英文关键词: crop residues biochars pyrene adsorption |
| 基金项目: |
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| 摘要点击次数: 2785 |
| 全文下载次数: 2555 |
| 中文摘要: |
| 采用小麦秸秆、玉米秸秆和花生壳低温热裂解生成的生物质炭，通过控制吸附时间、溶液初始质量浓度和投加量，研究了不同作物原料生物质炭对芘的吸附性能，并比较了三者的解吸率。结果表明：3种生物质炭对芘的吸附约经12 h达到平衡，吸附动力学过程符合Lagergren 准二级反应动力学模型；等温吸附均可用Langmuir方程和Freundlich方程拟合，且前者拟合程度稍好；玉米秸秆炭、小麦秸秆炭和花生壳炭在25 ℃下对芘的饱和吸附量分别为1667、714、370 μg·g-1；在生物质炭投加量为500 mg·L-1时，3种生物质炭对芘的去除率均在90%以上；将吸附达平衡后的生物质炭进行连续6 d的解吸，发现3种生物质炭对芘的解吸率均在7%以下。因此，作物秸秆，尤其是玉米秸秆，热裂解成生物质炭可望作为去除水体多环芳烃污染的新型吸附材料。 |
| 英文摘要: |
| In this study, biochars produced via pyrolysis of wheat straw, corn straw and peanut husk were used as adsorbents for pyrene removal from aqueous solution. Adsorption and desorption of pyrene by different biochars were evaluated at different contact time, initial concentrations and adsorbent doses. Adsorption of pyrene on biochars reached equilibrium almost within 12 h, and the process was described by the pseudo second order dynamic equation. The equilibrium adsorption was fitted with both Langmiur and Freundlich equation, with Langmiur better. The maximum adsorption was 1667 μg·g-1, 714 μg·g-1 and 370 μg·g-1 at 25 ℃ for corn straw, wheat straw and peanut husk biochars, respectively. The removal rates of pyrene from solution was over 90% for three biochars at 500 mg·L-1 addition. The desorption rates of adsorbed pyrene were less than 7% for three biochars during 6 days. Our results suggest that biochars produced from crop residues, especially corn straw, could act as potential adsorbents in removing polycyclic aromatic hydrocarbon（PAHs） from aqueous solution. |
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