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腐殖酸負載載體對菲的吸附能效
摘要:土壤腐殖酸的吸附作用對多環(huán)芳烴等疏水性有機污染物的遷移產(chǎn)生影響.針對腐殖酸負載載體的吸附能效開展研究,利用不同粒徑的玻璃珠(37~63、105~125、177~250和350~500 μm)作為載體,從土壤中提取腐殖酸并負載其上進行菲的吸附對比試驗,結(jié)果表明,菲在固液兩相的分布規(guī)律符合Freundlich吸附等溫式,粒徑較小的材料(比表面積較大)負載效率高且整體吸附能力強.采用吸附能力系數(shù)與負載效率的比值評價吸附能效,表現(xiàn)為粒徑較小的材料(比表面積較大)吸附能效反而偏低.本文為提高腐殖酸吸附能效的應用研究提供了理論基礎.Abstract:Humic acid in soil plays an important role in transfer of hydrophobic organic compounds such as polycyclic aromatic hydrocarbons (PAHs).Humic acid can be coated onto some carriers,and its adsorption performance is of great concern.In this study,glass beads in four different size ranges (37-63 μm,105-125 μm,177-250 μm,350-500 μm) were used as the carrier and coated with humic acid extracted from natural soil.The lab-scale experiment for phenanthrene adsorption was carried out.The distribution of phenanthrene in solid and water phases was in accordance with Freundlich isotherms,which implies that larger total surface area (TSA) leads to higher coating efficient and adsorption capacity.However,when the ratio of Freundlich capacity parameter to coating efficiency was used to evaluate the adsorption performance of humic acid in consideration of TSA,smaller particles (with larger TSA) resulted in a smaller ratio value.This study provides a reference for further studies on improvement of adsorption of humic acids. 作者: 章真怡李廣賀 Author: ZHANG Zhenyi LI Guanghe 作者單位: 清華大學環(huán)境科學與工程系,北京,100084 期 刊: 化工學報 ISTICEIPKU Journal: CIESC JOURNAL 年,卷(期): 2010, 61(4) 分類號: X131.3 關鍵詞: 腐殖酸 菲 吸附 Keywords: humic acid phenanthrene adsorption 機標分類號: S1 TV1 機標關鍵詞: 土壤腐殖酸 負載 載體 吸附能力 能效 adsorption performance humic acid polycyclic aromatic hydrocarbons Freundlich hydrophobic organic compounds 疏水性有機污染物 比表面積 粒徑 surface area transfer of size ranges 吸附等溫式 提取腐殖酸 study experiment 基金項目: 國家自然科學基金【腐殖酸負載載體對菲的吸附能效】相關文章:
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