Adsorption of atrazine by natural organic matter and surfactant dispersed carbon nanotubes.
Adsorption of atrazine by natural organic matter and surfactant dispersed carbon nanotubes.
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DOI：
10.1016/s1001-0742(09)60238-2
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发表时间：
2010-08
影响因子：
6.9
通讯作者：
Baoyou Shi;Xiaoyan Zhuang;Xiaomin Yan;Jiajuan Lu;Hong-xiao Tang
中科院分区：
文献类型：
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作者：
Baoyou Shi;Xiaoyan Zhuang;Xiaomin Yan;Jiajuan Lu;Hong-xiao Tang
碳纳米管（CNT）的聚集和分散行为可以调节CNT的环境扩散和命运，以及其上吸附的有机污染物。在这项研究中，使用不同来源的腐殖酸和不同离子类型的表面活性剂对多壁碳纳米管（MWNT）和单壁碳纳米管（SWNT）进行表面改性。通过紫外-可见分光光度法观察表面改性碳纳米管的分散稳定性。通过间歇平衡实验研究了腐植酸和表面活性剂分散体对碳纳米管吸附莠去津的影响。在研究条件下，腐殖酸和表面活性剂都可以有效地将多壁碳纳米管（而不是单壁碳纳米管）分散成稳定的悬浮液。表面改性的碳纳米管对莠去津的吸附能力大大降低。泥炭腐植酸的抑制效果相对较强于土壤腐植酸，但两种表面活性剂对两种CNT类型对莠去津的吸附具有相似的抑制效果。当表面活性剂浓度小于0.5临界胶束浓度时，表面活性剂浓度的增加导致碳纳米管对莠去津的吸附迅速降低。
The aggregation and dispersion behaviors of carbon nanotubes (CNTs) can regulate the environmental spread and fate of CNTs, as well as the organic pollutants adsorbed onto them. In this study, multi-walled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) were surface modified with humic acids from different sources and with surfactants of different ionic types. The dispersion stability of surface modified CNTs was observed by UV-Vis spectrophotometry. The effect of humic acid and surfactant dispersion on the adsorption of atrazine by CNTs was investigated by batch equilibrium experiments. Both humic acid and surfactant could effectively disperse MWNTs, but not SWNTs, into stable suspensions under the studied conditions. Surface modified CNTs had a greatly reduced capacity for adsorption of atrazine. The inhibitory effect of peat humic acid was relatively stronger than that of soil humic acid, but the two surfactants had a similar inhibitory effect on atrazine adsorption by the two CNT types. Increases in surfactant concentration resulted in rapid decreases in the adsorption of atrazine by CNTs when the surfactant concentration was less than 0.5 critical micelle concentration.