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沉积物、生物炭和活性炭吸附甲磺隆的特征及机理

DOI: 10.11654/jaes.2014.12.014, PP. 2374-2380

Keywords: 沉积物,生物炭,活性炭,甲磺隆,吸附

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Abstract:

吸附是影响污染物环境行为的关键因素,鉴于甲磺隆在环境介质中的高迁移性和环境风险,探讨了甲磺隆在沉积物和碳质吸附剂(生物炭和活性炭)上的吸附特征和机理.结果表明,吸附剂的性质对甲磺隆的吸附有重要影响:有机质含量高、pH低的沉积物有利于甲磺隆的吸附;对于碳质吸附剂,非线性指数n与H/C正相关,吸附能力lgKoc与H/C负相关,表明炭化程度越高,吸附非线性程度越强,吸附能力越大,可能是因为微孔数量和芳香碳含量增多分别有利于孔填充作用和π-π电子受体-供体(π-πEDA)作用的发生;lgKoc与比表面积(SA)正相关进一步说明了孔填充起着重要作用,lgKoc与O/C负相关表明碳质吸附剂表面的疏水性越强越有利于甲磺隆的吸附.生物炭和活性炭对甲磺隆的吸附能力分别比沉积物约高1和3个数量级,表明施加碳质吸附剂可能会降低沉积物中甲磺隆向地表水和地下水的迁移性.尽管生物炭的吸附能力低于活性炭,但是相比于活性炭,生物炭的成本更加低廉,具有广阔的应用前景.

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