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天然土壤对BDE-47的吸附特征

Keywords: BDE-47,土壤,吸附,动力学,等温线

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Abstract:

研究了BDE-47在3种不同有机质含量的天然土壤上的吸附行为,包括吸附过程动力学和热力学等温线。结果表明,双室一级动力学模式较单室一级动力学模式更适于描述BDE-47在天然土壤上的吸附过程动力学特征,尤其是在吸附初始阶段(0~49h)。快吸附在自吸附初始到表观吸附平衡的整体吸附过程中占据优势地位,而慢吸附的贡献率则逐渐增加并在97h后达到相对稳定。快吸附达到其吸附容量的时间远快于慢吸附。在吸附开始阶段的3~5h,BDE-47吸附总量的增加主要决定于快吸附,但在后续的吸附阶段,慢吸附的影响逐渐成为主导。因BDE-47水相溶解度很低,在较窄的平衡浓度范围内,线性分配模式和非线性Freundlich模式对BDE-47的吸附等温线都能提供很好的拟合结果。在Freundlich模型结果中,具有较低(0.72%)和较高(7.90%)TOC分数的土样的非线性指数n都明显低于1.0(分别为0.75±0.03和0.74±0.02),表明2种土样在相应的BDE-47平衡浓度范围内表现出一定的非线性吸附特征;而另一TOC分数居中(2.86%)的土样则表现出显著的线性行为,其非线性指数n明显接近1.0(1.03±0.03)。

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