碳纳米管对铅离子的吸附性能研究

Study on Adsorption Property of CNTs to Leader(II)

采用几种不同来源的碳纳米管进行铅离子的吸附实验,并用活性炭进行对比实验,从管径、比表面积、孔体积等几个方面分析不同来源碳纳米管吸附量差异的原因,考察对碳纳米管吸附量的影响。结果表明:实验所用三种来源碳纳米管的对铅离子的吸附均能在较短的时间内达到吸附平衡,碳纳米管单位比表面积的吸附量是活性炭的十几甚至几十倍,吸附能力均优于活性炭的吸附能力,在吸附方面具有明显的优势;不同来源碳纳米管的吸附量主要由其管径和开口率所决定,管径越小,开口率越大,则比表面积越大,吸附量也越大;碳纳米管吸附铅离子的过程为放热过程,在低温下有利于铅离子的吸附。这些结果为碳纳米管在金属离子吸附方面提供了基础数据。

Adsorption experiment was carried out with avtivated carbon and different carbon nanotubes as adsorbent and Leader(II) as adsorbate. The difference of the adsorption ability of different carbon nanotubes was analyzed from several ways, such as the diameter of tube, specific surface area and pore volume. The effect of temperature was researched. The results show that the adsorption equilibrium of carbon nanotubes can be reached in short time. The ability of adsorption of Pb2+ of CNTs is better than that of activated carbon. The amount of adsorption of different carbon nanotubes depends on their diameter and open ratio The smaller diameter of nanotubes and larger open ratio the larger spelfic surface areais, which relates to larger adsorption amount. The procedure of carbon nanotubes to leader (II) is exothermic. It is favorable to adsorption at lower temperature.