Competitive adsorption of heavy metal ions on carbon nanotubes and the desorption in simulated biofluids
Competitive adsorption of heavy metal ions on carbon nanotubes and the desorption in simulated biofluids
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DOI：
10.1016/j.jcis.2015.02.042
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发表时间：
2015-06-15
影响因子：
9.9
通讯作者：
Wang, Haifang
中科院分区：
文献类型：
--
作者：
Ma, Xin;Yang, Sheng-Tao;Wang, Haifang
碳纳米管（CNTs）对Pb 2+、Cu 2+、Zn 2+和Cd 2+具有有意义的吸附容量，而Pb 2+在竞争吸附评价中表现出最高的吸附。重金属离子的解吸行为在不同的生物流体中是完全不同的，其中解吸显着影响pH值和蛋白质/其他阳离子的存在。解吸是最有效的模拟胃液，和其他模拟生物流体的效果要差得多。吸附在碳纳米管上的Pb 2+比吸附在其他碳纳米管上的Pb 2+多，导致解吸较少。有趣的是，四种离子的竞争脱附行为与单独脱附行为相比发生了很大的变化。CNT的生物安全性评价和协同效应的影响进行了讨论。(C)2015爱思唯尔公司All rights reserved.
Carbon nanotubes (CNTs) had meaningful adsorption capacities for Pb2+, Cu2+, Zn2+ and Cd2+, while Pb2+ showed the highest adsorption in the competitive adsorption evaluations. The desorption behaviors of heavy metal ions were completely different in various biofluids, where the desorption was significantly influenced by pH and the presence of proteins/other cations. The desorption was most effective in simulated stomach juice, and much less effective in other simulated biofluids. More Pb2+ stuck to CNTs than others, resulting in less desorption. Interestingly, the competitive desorption behaviors of four ions were largely changed comparing to the individual desorption behaviors. The implications to the biosafety evaluations and synergistic effects of CNT are discussed. (C) 2015 Elsevier Inc. All rights reserved.