粘土矿物和碳纳米管对微囊藻毒素的吸附

研究了不同粘土矿物和碳纳米管 (CNTs)吸附去除水体中微囊藻毒素 (Microcystins,MCs)的作用 .结果表明 ,在MC RR和LR的初始浓度分别为 2 1 0和 9 5mg·L-1时 ,尽管高岭土和海泡石等粘土矿物对MCs有一定的吸附能力 ,但吸附量分别低于 3 0和 1 6mg·g-1.与测试的不同粘土矿物相比 ,CNTs对MCs的吸附能力较强 ,吸附MC RR和LR量分别达到了 14 8和 6 7mg·g-1,是粘土矿物吸附量的 5倍左右 .进一步研究发现 ,CNTs对MCs的吸附能力随CNTs外径的增加而减少 ,说明CNTs的比表面积是决定吸附MCs量大小的重要因素之一 ,这在如何选择碳纳米管规格用于高效吸附去除水体中MCs方面具有重要意义

Adsorption of Microcystins by Clays and Carbon Nanotubes

Adsorption and removal of microcystins (MCs) from water by different clays and carbon nanotubes (CNTs) were studied in this paper. It was shown that although the clay materials of kaolinite and sepiolite et al. have the abilities in the adsorption of MCs, the absorbed amounts of MC-RR and LR were only 3.0 and 1.6 mg/g at initial MC-RR of 21.0 mg/L and MC-LR of 9.5 mg/L, respectively. Compared with clays tested, CNTs were found to have the strong abilities in the adsorption of MCs and adsorption amounts of MC-RR and LR were 14.8 and 6.7 mg/g, respectively, which was about five times higher than those of different clays. It was also indicated that the adsorption amounts of MCs were increase with the decrease of outside diameter of CNTs, and the specific surface area of CNTs might play one of key roles in the adsorption of MCs, which is very important in the selection of CNTs size for effective removal of MCs from water.