| 张桂香,何秋生,闫雨龙,孙可,刘希涛.沉积物、生物炭和活性炭吸附甲磺隆的特征及机理[J].农业环境科学学报,2014,33(12):2374-2380. |
| 沉积物、生物炭和活性炭吸附甲磺隆的特征及机理 |
| Characteristics and Mechanisms for Metsulfuron-methyl Sorption by Sediments, Biochars and Activated Carbon |
| 投稿时间：2014-07-15 |
| DOI：10.11654/jaes.2014.12.014 |
| 中文关键词: 沉积物 生物炭 活性炭 甲磺隆 吸附 |
| 英文关键词: sediment biochar activated carbon metsulfuron-methyl sorption |
| 基金项目:太原科技大学博士科研启动基金(20122043);山西省高校科技创新项目(20131047);科技部项目(2013AA062705-3);环保部项目(201309044) |
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| 中文摘要: |
| 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-π EDA)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. |
| 英文摘要: |
| Metsulfuron-methyl has high mobility in the environment compartments and ecological risks. Sorption is a key process influencing the environmental behaviors of contaminants. In this study, the characteristics and mechanisms of metsulfuron-methyl sorption by sediments and carbonaceous sorbents(biochars and activated carbon). The properties of sorbents significantly affected their sorption of metsulfuron-methyl. The sediments with higher organic matter contents and lower pH adsorbed more metsulfuron-methyl. For carbonaceous sorbents, H/C was found to be negatively correlated with nonlinearity index n and positively with sorption affinity lgKoc, indicating that carbonaceous sorbents with higher carbonization degree had stronger sorption nonlinearity and sorption affinity. This might be attributed to increased micropores and aromatic carbon, which were favorable to pore-filling and π-π electron donor-acceptor(π-π EDA) interaction, respectively. Positive correlation between lgKoc and specific surface area(SA) further verified the important role of pore-filling mechanism. Negative correlation between lgKoc and O/C indicated that carbonaceous sorbents with stronger hydrophobicity more facilitated metsulfuron-methyl sorption. Sorption affinities of biochars and activated carbon for metsulfuron-methyl were about 1 and 3 order of magnitude higher than those of sediments, suggesting that adding carbonaceous sorbents to sediments might reduce metsulfuron-methyl leaching into the surface and ground water. Although sorption affinities of biochars for metsulfuron-methyl were lower than that of activated carbon, biochars might also have promising applications because of much lower cost than activated carbon. |
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