Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile.
Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Avenida Vicuña Mackenna 4860, Macul, Santiago 7820436, Chile.
Molecules. 2020 Jul 8;25(14):3106. doi: 10.3390/molecules25143106.
In recent years, carbon nanotubes (CNTs) have been intensively studied as an effective adsorbent for the removal of pollutants from wastewater. One of the main problems for its use corresponds to the agglomeration of the CNTs due to the interactions between them, which prevents using their entire surface area. In this study, we test the effect of dispersion of oxidized multi-walled carbon nanotubes (MWCNTs) on the removal of heavy metals from acidic solutions. For this, polyurethane filters were dyed with a well-dispersed oxidized MWCNTs solution using chemical and mechanical dispersion methods. Filters were used in column experiments, and the sorption capacity increased more than six times (600%) compared to experiments with suspended MWCNTs. Further, kinetic experiments showed a faster saturation on MWCNTs in column experiments. These results contribute to a better understanding of the effect of dispersion on the use of CNTs as heavy metal ions adsorbent.
近年来，碳纳米管（CNTs）作为一种有效的吸附剂，被广泛研究用于去除废水中的污染物。其应用的主要问题之一是由于相互作用，CNTs 会发生团聚，从而阻止了其全部表面积的利用。在这项研究中，我们测试了分散氧化多壁碳纳米管（MWCNTs）对去除酸性溶液中重金属的效果。为此，使用化学和机械分散方法，将氧化 MWCNTs 溶液染色到聚氨酯过滤器上。在柱实验中使用过滤器，与悬浮 MWCNTs 的实验相比，吸附容量增加了六倍以上（600%）。此外，动力学实验表明，MWCNTs 在柱实验中的饱和速度更快。这些结果有助于更好地理解分散对 CNTs 作为重金属离子吸附剂的使用效果的影响。
