Effect of Dispersion on Adsorption of Atrazine by Aqueous Suspensions of Fullerenes
Effect of Dispersion on Adsorption of Atrazine by Aqueous Suspensions of Fullerenes
复制标题
分散体对富勒烯水悬浮液吸附莠去津的影响
DOI：
10.1021/es103595g
复制
发表时间：
2011-07-15
影响因子：
11.4
通讯作者：
Wang, Dongsheng
中科院分区：
文献类型：
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作者：
Gai, Ke;Shi, Baoyou;Wang, Dongsheng
随着富勒烯的广泛应用，评估它们的环境行为及其对有机污染物的迁移和生物有效性的影响是至关重要的。研究了富勒烯(C-60)水分散体对阿特拉津吸附的影响，考察了富勒烯粒径、溶液化学组成和天然有机物对阿特拉津吸附的影响。结果表明，Polanyi-Manes模型能很好地拟合吸附等温线。较小尺寸的富勒烯颗粒增加了可用位，从而增强了阿特拉津在C-60上的吸附。然而，由于表面化学变化，高度分散的C-60体系可能不具有适当的高吸附能力。C-60水分散体对阿特拉津的吸附随着溶液pH的降低而增加。腐植酸的引入显著减小了C-60颗粒的尺寸，并导致了吸附量的增加。富勒烯材料一旦释放到水环境中，容易形成分散程度不同的悬浮液，这将极大地影响有机污染物的迁移和归宿。
With the widespread application of fullerenes, it is critical to assess their environmental behaviors and their impacts on the transport and bioavailability of organic contaminants. The effects of fullerene particle size, chemistry of the solution, and natural organic matter on the adsorption of atrazine by aqueous dispersions of fullerenes (C-60) were investigated in this work. The results showed that the Polanyi-Manes model could fit the adsorption isotherms well. Smaller sizes of fullerene particles led to increased available sites and, consequently, enhanced the adsorption of atrazine on C-60. However, intensely dispersed C-60 systems might not possess suitably high adsorptive capacities due to surface chemistry change. Adsorption of atrazine by aqueous dispersions of C-60 increased with a decrease in the pH of the solution. Introduction of humic acid significantly reduced the size of the C-60 particles, and resulted in the increase of the adsorption amount. Fullerene materials, once released into the aquatic environment, are inclined to form aqueous suspensions with different degrees of dispersion, which would greatly affect the transport and fate of organic contaminants.